Commit Graph

580 Commits

Author SHA1 Message Date
Xiaoyan Lin
b7415a3307 Add a reusable ArrayList to InternalThreadLocalMap
Motivation:

See #3411. A reusable ArrayList in InternalThreadLocalMap can avoid allocations in the following pattern:

```
List<...> list = new ArrayList<...>();

add something to list but never use InternalThreadLocalMap

return list.toArray(new ...[list.size()]);

```

Modifications:

Add a reusable ArrayList to InternalThreadLocalMap and update codes to use it.

Result:

Reuse a thread local ArrayList to avoid allocations.
2016-02-01 15:49:28 +01:00
Scott Mitchell
ca305d86fb PlatformDependent String char[] optimization
Motivation:
PlatformDependent0 has an optimization which grabs the char[] from a String. Since this code was introduced http://openjdk.java.net/jeps/254 has been gaining momentum in JDK 9. This JEP changes the internal storage from char[] to byte[], and thus the existing char[] only based optimizations will not work.

Modifications:
- The ASCII encoding char[] String optimizations should also work for byte[].

Result:
ASCII encoding char[] String optimizations don't break if the underlying storage in String is byte[].
2016-01-27 09:55:43 -08:00
Xiaoyan Lin
ff11fe894d Fix the last value in AsciiString.trim
Motivation:

In AsciiString.trim, last should be `arrayOffset() + length() - 1`. See #4741.

Modifications:

Fix the last value.

Result:

AsciiString.trim works correctly.
2016-01-22 14:06:30 +01:00
Scott Mitchell
7494e84208 PlatformDependent static initialization ExceptionInInitializerError
Motivation:
PlatformDependent allows some exceptions to escape during static initialization. If an exception escapes it will be translated into a java.lang.ExceptionInInitializerError and render the application unable to run.

Modifications:
- Make sure to catch Throwable during static initialization.

Result:
PlatformDependent static initialization doesn't result in java.lang.ExceptionInInitializerError.
2016-01-20 06:13:36 -08:00
Norman Maurer
7b51412c3c Allow to do async mappings in the SniHandler
Motivation:

Sometimes a user want to do async mappings in the SniHandler as it is not possible to populate a Mapping up front.

Modifications:

Add AsyncMapping interface and make SniHandler work with it.

Result:

It is possible to do async mappings for SNI
2016-01-18 21:02:13 +01:00
Scott Mitchell
7dba13f276 HttpConversionUtil remove throws from method signature
Motivation:
HttpConversionUtil.toHttp2Headers currently has a throws Exception as part of the signature. This comes from the signature of ByteProcessor.process, but is not necessary because the ByteProcessor used does not throw.

Modifications:
- Remove throws Exception from the signature of HttpConversionUtil.toHttp2Headers.

Result:
HttpConversionUtil.toHttp2Headers interface does not propagate a throws Exception when it is used.
2016-01-15 10:53:34 +01:00
Stephane Landelle
b4be040f30 Introduce DnsCache API + DnsResolver extensibility
Motivation:
Caching is currently nested in DnsResolver.
It should also be possible to extend DnsResolver to ba able to pass a different cache on each resolution attemp.

Modifications:

* Introduce DnsCache, NoopDnsCache and DefaultDnsCache. The latter contains all the current caching logic that was extracted.
* Introduce protected versions of doResolve and doResolveAll that can be used as extension points to build resolvers that bypass the main cache and use a different one on each resolution.

Result:

Isolated caching logic. Better extensibility.
2016-01-08 14:46:47 +01:00
Stephane Landelle
1bee71fb1c Fix PlatformDependent.newAtomic*FieldUpdater type safety
Motivation:

* newAtomicIntegerFieldUpdater and newAtomicLongFieldUpdater take a
class<?> so they're too lax
* newAtomicReferenceFieldUpdater takes a Class<U> so it's too strict
and can only be passe a rawtype parameter when dealing w/ generic
classes

Modifications:

Take a Class<? super T> parameter instead.

Result:

Better type safety and generics support.
2016-01-08 08:51:24 +01:00
Fabian Lange
619d82b56f Removed unused imports
Motivation:

Warnings in IDE, unclean code, negligible performance impact.

Modification:

Deletion of unused imports

Result:

No more warnings in IDE, cleaner code, negligible performance improvement.
2016-01-04 14:32:29 +01:00
Xiaoyan Lin
475d901131 Fix errors reported by javadoc
Motivation:

Javadoc reports errors about invalid docs.

Modifications:

Fix some errors reported by javadoc.

Result:

A lot of javadoc errors are fixed by this patch.
2015-12-27 08:36:45 +01:00
Xiaoyan Lin
a96d52fe66 Fix javadoc links and tags
Motivation:

There are some wrong links and tags in javadoc.

Modifications:

Fix the wrong links and tags in javadoc.

Result:

These links will work correctly in javadoc.
2015-12-26 08:34:31 +01:00
eantaev
7c1602125a Builder to construct DomainNameMapping.
Motivation:

DomainNameMapping.add() makes DomainNameMapping look like it's safe to call add() anytime, and this is never true. It's probably better deprecate add() and introduce DomainNameMappingBuilder.

Modifications:

Made an immutable implementation of DomainNameMapping;
Added Builder for immutable DomainNameMapping;
Replaced regex pattern with String::startsWith check;
Replaced HashMap with two arrays in ImmutableDomainNameMapping;
Deprecated mutable API;
Estimation for StringBuilder initial size in ImmutableDomainNameMapping#toString()
Added StringUtil#commonSuffixOfLength
Replaced unnecessary substrings creation in DomainNameMapping#matches with regionMatches

Result:

Clients will be able to create immutable instances of DomainNameMapping with builder API.
2015-12-20 18:50:09 +01:00
Scott Mitchell
f750d6e36c ByteBufUtil.writeUtf8 Surrogate Support
Motivation:
UTF-16 can not represent the full range of Unicode characters, and thus has the concept of Surrogate Pair (http://unicode.org/glossary/#surrogate_pair) where 2 16-bit code units can be used to represent the missing characters. ByteBufUtil.writeUtf8 is currently does not support this and is thus incomplete.

Modifications:
- Add support for surrogate pairs in ByteBufUtil.writeUtf8

Result:
ByteBufUtil.writeUtf8 now supports surrogate pairs and is correctly converting to UTF-8.
2015-12-18 13:51:52 -08:00
Scott Mitchell
904e70a4d4 HTTP/2 Weighted Fair Queue Byte Distributor
Motivation:
PriorityStreamByteDistributor uses a homegrown algorithm which distributes bytes to nodes in the priority tree. PriorityStreamByteDistributor has no concept of goodput which may result in poor utilization of network resources. PriorityStreamByteDistributor also has performance issues related to the tree traversal approach and number of nodes that must be visited. There also exists some more proven algorithms from the resource scheduling domain which PriorityStreamByteDistributor does not employ.

Modifications:
- Introduce a new ByteDistributor which uses elements from weighted fair queue schedulers

Result:
StreamByteDistributor which is sensitive to priority and uses a more familiar distribution concept.
Fixes https://github.com/netty/netty/issues/4462
2015-12-17 11:17:02 -08:00
Stephane Landelle
8d4db050f3 Have hosts file support for DnsNameResolver, close #4074
Motivation:

On contrary to `DefaultNameResolver`, `DnsNameResolver` doesn't currently honor hosts file.

Modifications:

* Introduce `HostsFileParser` that parses `/etc/hosts` or `C:\Windows\system32\drivers\etc\hosts` depending on the platform
* Introduce `HostsFileEntriesResolver` that uses the former to resolve host names
* Make `DnsNameResolver` check his `HostsFileEntriesResolver` prior to trying to resolve names against the DNS server
* Introduce `DnsNameResolverBuilder` so we now have a builder for `DnsNameResolver`s
* Additionally introduce a `CompositeNameResolver` that takes several `NameResolver`s and tries to resolve names by delegating sequentially
* Change `DnsNameResolver.asAddressResolver` to return a composite and honor hosts file

Result:

Hosts file support when using `DnsNameResolver`.
Consistent behavior with JDK implementation.
2015-12-17 15:15:42 +01:00
Brendt Lucas
e8eda1b99f Fix AsciiString.contentEqualsIgnoreCase
Motivation:

Related to issue #4564.

AsciiString.contentEqualsIgnoreCase fails when comparing two AsciiStrings of the same length

Modifications:

Compare the values of the first AsciiString to the second AsciiString

Result:

AsciiString.contentEqualsIgnoreCase works as expected
2015-12-12 19:48:17 +01:00
Scott Mitchell
32933821bb AbstractFuture should not wrap CancellationException
Motivation:
AbstractFuture currently wraps CancellationException in a ExecutionException. However the interface of Future says that this exception should be directly thrown.

Modifications:
- Throw CancellationException from AbstractFuture.get

Result:
Interface contract for CancellationException is honored in AbstractFuture.
2015-12-11 10:24:08 -08:00
Scott Mitchell
6257091d12 HttpConversionUtil does not account for COOKIE compression
Motivation:
The HTTP/2 RFC allows for COOKIE values to be split into individual header elements to get more benefit from compression (https://tools.ietf.org/html/rfc7540#section-8.1.2.5). HttpConversionUtil was not accounting for this behavior.

Modifications:
- Modify HttpConversionUtil to support compressing and decompressing the COOKIE values

Result:
HttpConversionUtil is compatible with https://tools.ietf.org/html/rfc7540#section-8.1.2.5)
Fixes https://github.com/netty/netty/issues/4457
2015-12-08 20:00:31 -08:00
Scott Mitchell
1f3fc983c0 DefaultPromise LateListener notification order
Motivation:
There is a notification ordering issue in DefaultPromise when the lateListener collection is in use. The ordering issue can be observed in situations where a late listener is added to a Future returned from a write operation. It is possible that this future will run after a read operation scheduled on the I/O thread, even if the late listener is added on the I/O thread. This can lead to unexpected ordering where a listener for a write operation which must complete in order for the read operation to happen is notified after the read operation is done.

Modifications:
- If the lateListener collection becomes empty, it should be treated as though it was null when checking if lateListeners can be notified immediatley (instead of executing a task on the executor)

Result:
Ordering is more natural and will not be perceived as being out of order relative to other tasks on the same executor.
2015-11-20 09:30:35 -08:00
Dmitry Spikhalskiy
2a65ae256e [#4331] Helper methods to get charset from Content-Type header of HttpMessage
Motivation:

HttpHeaders already has specific methods for such popular and simple headers like "Host", but if I need to convert POST raw body to string I need to parse complex ContentType header in my code.

Modifications:

Add getCharset and getCharsetAsString methods to parse charset from Content-Length header.

Result:

Easy to use utility method.
2015-11-19 15:59:34 -08:00
Scott Mitchell
b4b791353d AsciiString optimized hashCode
Motivation:
The AsciiString.hashCode() method can be optimized. This method is frequently used while to build the DefaultHeaders data structure.

Modification:
- Add a PlatformDependent hashCode algorithm which utilizes UNSAFE if available

Result:
AsciiString hashCode is faster.
2015-11-10 10:28:31 -08:00
Vladimir Krivosheev
a4f3e72e71 configurable service thread name prefix
Motivation:

If netty used as part of application, should be a way to prefix service thread name to easy distinguish such threads (for example, used in IntelliJ Platform)

Modifications:

Introduce system property io.netty.serviceThreadPrefix

Result:

ThreadDeathWatcher thread has a readable name "Netty threadDeathWatcher-2-1" if io.netty.serviceThreadPrefix set to "Netty"
2015-11-05 08:51:12 +01:00
Scott Mitchell
19658e9cd8 HTTP/2 Headers Type Updates
Motivation:
The HTTP/2 RFC (https://tools.ietf.org/html/rfc7540#section-8.1.2) indicates that header names consist of ASCII characters. We currently use ByteString to represent HTTP/2 header names. The HTTP/2 RFC (https://tools.ietf.org/html/rfc7540#section-10.3) also eludes to header values inheriting the same validity characteristics as HTTP/1.x. Using AsciiString for the value type of HTTP/2 headers would allow for re-use of predefined HTTP/1.x values, and make comparisons more intuitive. The Headers<T> interface could also be expanded to allow for easier use of header types which do not have the same Key and Value type.

Motivation:
- Change Headers<T> to Headers<K, V>
- Change Http2Headers<ByteString> to Http2Headers<CharSequence, CharSequence>
- Remove ByteString. Having AsciiString extend ByteString complicates equality comparisons when the hash code algorithm is no longer shared.

Result:
Http2Header types are more representative of the HTTP/2 RFC, and relationship between HTTP/2 header name/values more directly relates to HTTP/1.x header names/values.
2015-10-30 15:29:44 -07:00
Trustin Lee
d0f3cd383d Fix a bug where DefaultPromise.toString() says 'incomplete' when it's done
Motivation:

DefaultPromise.toString() returns 'DefaultPromise(incomplete)' when it's
actually complete with non-null result.

Modifications:

Handle the case where the promise is done and its result is non-null in
toString()

Result:

The String returned by DefaultPromise.toString() is not confusing
anymore.
2015-10-30 08:12:18 +01:00
Norman Maurer
a47685b243 Use bitwise operation when sampling for resource leak detection.
Motivation:

Modulo operations are slow, we can use bitwise operation to detect if resource leak detection must be done while sampling.

Modifications:

- Ensure the interval is a power of two
- Use bitwise operation for sampling
- Add benchmark.

Result:

Faster sampling.
2015-10-29 19:18:44 +01:00
Scott Mitchell
ed98cd8200 DefaultPromise StackOverFlowException
Motivation:
When the ImmediateEventExecutor is in use it is possible to get a StackOverFlowException if when a promise completes a new listener is added to that promise.

Modifications:
- Protect against the case where LateListeners.run() smashes the stack.

Result:
Fixes https://github.com/netty/netty/issues/4395
2015-10-29 11:10:57 -07:00
Norman Maurer
7d4c077492 Add *UnsafeHeapByteBuf for improve performance on systems with sun.misc.Unsafe
Motivation:

sun.misc.Unsafe allows us to handle heap ByteBuf in a more efficient matter. We should use special ByteBuf implementation when sun.misc.Unsafe can be used to increase performance.

Modifications:

- Add PooledUnsafeHeapByteBuf and UnpooledUnsafeHeapByteBuf that are used when sun.misc.Unsafe is ready to use.
- Add UnsafeHeapSwappedByteBuf

Result:

Better performance when using heap buffers and sun.misc.Unsafe is ready to use.
2015-10-21 09:04:13 +02:00
Norman Maurer
f30a51b905 Correctly handle byte shifting if system does not support unaligned access.
Motivation:

We had a bug in our implemention which double "reversed" bytes on systems which not support unaligned access.

Modifications:

- Correctly only reverse bytes if needed.
- Share code between unsafe implementations.

Result:

No more data-corruption on sytems without unaligned access.
2015-10-20 17:32:13 +02:00
Norman Maurer
b7e947709e [#4357] Fix possible assert error in GlobalEventExecutor
Motivation:

We started the thread before store it in a field which could lead to an assert error when the thread is executed before we actually store it.

Modifications:

Store thread before start it.

Result:

No more assert error possible.
2015-10-16 20:56:25 +02:00
Norman Maurer
11e8163aa9 [#4284] Forward decoded messages more frequently
Motivation:

At the moment we only forward decoded messages that were added the out List once the full decode loop was completed. This has the affect that resources may not be released as fast as possible and as an application may incounter higher latency if the user triggeres a writeAndFlush(...) as a result of the decoded messages.

Modifications:

- forward decoded messages after each decode call

Result:

Forwarding decoded messages through the pipeline in a more eager fashion.
2015-10-07 14:15:53 +02:00
Scott Mitchell
d4680c55d8 AsciiString contains utility methods
Motivation:
When dealing with case insensitive headers it can be useful to have a case insensitive contains method for CharSequence.

Modifications:
- Add containsCaseInsensative to AsciiString

Result:
More expressive utility method for case insensitive CharSequence.
2015-10-02 12:50:11 -07:00
Scott Mitchell
c7e3f6c6fd HTTP/2 defines using String instead of CharSequence
Motivation:
Http2CodecUtils has some static variables which are defined as Strings instead of CharSequence. One of these defines is used as a header name and should be AsciiString.

Modifications:
- Change the String defines in Http2CodecUtils to CharSequence

Result:
Types are more consistently using CharSequence and adding the upgrade header will require less work.
2015-09-16 14:55:33 -07:00
Matteo Merli
9b45e9d015 Additional configuration for leak detection
Motivation:

Leak detector, when it detects a leak, will print the last 5 stack
traces that touched the ByteBuf. In some cases that might not be enough
to identify the root cause of the leak.
Also, sometimes users might not be interested in tracing all the
operations on the buffer, but just the ones that are affecting the
reference count.

Modifications:

Added command line properties to override default values:
 * Allow to configure max number of stack traces to collect
 * Allow to only record retain/release operation on buffers

Result:
Users can increase the number of stack traces to debug buffer leaks
with lot of retain/release operations.
2015-08-30 20:50:10 +02:00
Norman Maurer
6d473e7f39 Allow to get details of the Thread that powers a SingleThreadEventExecutor.
Motivation:

for debugging and metrics reasons its sometimes useful to be able to get details of the the Thread that powers a SingleThreadEventExecutor.

Modifications:

- Expose ThreadProperties
- Add unit test.

Result:

It's now possible to get details of the Thread that powers a SingleThreadEventExecutor.
2015-08-28 15:34:19 +02:00
Norman Maurer
1a9ea2d349 [#4147] Allow to disable recycling
Motivation:

Sometimes it is useful to disable recycling completely if memory constraints are very tight.

Modifications:

Allow to use -Dio.netty.recycler.maxCapacity=0 to disable recycling completely.

Result:

It's possible to disable recycling now.
2015-08-28 15:05:17 +02:00
Norman Maurer
eb1c97b3b9 [#4110] Correct javadocs of MpscLinkedQueue
Motivation:

The javadocs are incorrect and so give false impressions of use-pattern.

Modifications:

- Fix javadocs of which operations are allowed from multiple threads concurrently.
- Let isEmpty() work concurrently.

Result:

Correctly document usage-patterns.
2015-08-27 09:09:28 +02:00
Scott Mitchell
cbc38e938a UNSAFE.throwException null arg crashes JVM
Motivation:
It has been observed that passing a null argument to Unsafe.throwException can crash the JVM.

Modifications:
- PlatformUnsafe0.throwException should honor http://docs.oracle.com/javase/specs/jls/se8/html/jls-14.html#jls-14.18 and throw a NPE

Result:
No risk of JVM crashing for null argument.
Fixes https://github.com/netty/netty/issues/4131
2015-08-26 23:50:51 -07:00
Scott Mitchell
9bc322a6a8 StringUtil not closing Formatter
Motivation:
The StringUtil class creates a Formatter object, but does not close it. There are also a 2 utility methods which would be generally useful.

Modifications:
- Close the Formatter
- Add length and isNullOrEmpty

Result:
No more resource leaks. Additional utility methods.
2015-08-20 09:44:31 -07:00
Scott Mitchell
ba6ce5449e Headers Performance Boost and Interface Simplification
Motivation:
A degradation in performance has been observed from the 4.0 branch as documented in https://github.com/netty/netty/issues/3962.

Modifications:
- Simplify Headers class hierarchy.
- Restore the DefaultHeaders to be based upon DefaultHttpHeaders from 4.0.
- Make various other modifications that are causing hot spots.

Result:
Performance is now on par with 4.0.
2015-08-17 08:50:11 -07:00
Jakob Buchgraber
6fd0a0c55f Faster and more memory efficient headers for HTTP, HTTP/2, STOMP and SPYD. Fixes #3600
Motivation:

We noticed that the headers implementation in Netty for HTTP/2 uses quite a lot of memory
and that also at least the performance of randomly accessing a header is quite poor. The main
concern however was memory usage, as profiling has shown that a DefaultHttp2Headers
not only use a lot of memory it also wastes a lot due to the underlying hashmaps having
to be resized potentially several times as new headers are being inserted.

This is tracked as issue #3600.

Modifications:
We redesigned the DefaultHeaders to simply take a Map object in its constructor and
reimplemented the class using only the Map primitives. That way the implementation
is very concise and hopefully easy to understand and it allows each concrete headers
implementation to provide its own map or to even use a different headers implementation
for processing requests and writing responses i.e. incoming headers need to provide
fast random access while outgoing headers need fast insertion and fast iteration. The
new implementation can support this with hardly any code changes. It also comes
with the advantage that if the Netty project decides to add a third party collections library
as a dependency, one can simply plug in one of those very fast and memory efficient map
implementations and get faster and smaller headers for free.

For now, we are using the JDK's TreeMap for HTTP and HTTP/2 default headers.

Result:

- Significantly fewer lines of code in the implementation. While the total commit is still
  roughly 400 lines less, the actual implementation is a lot less. I just added some more
  tests and microbenchmarks.

- Overall performance is up. The current implementation should be significantly faster
  for insertion and retrieval. However, it is slower when it comes to iteration. There is simply
  no way a TreeMap can have the same iteration performance as a linked list (as used in the
  current headers implementation). That's totally fine though, because when looking at the
  benchmark results @ejona86 pointed out that the performance of the headers is completely
  dominated by insertion, that is insertion is so significantly faster in the new implementation
  that it does make up for several times the iteration speed. You can't iterate what you haven't
  inserted. I am demonstrating that in this spreadsheet [1]. (Actually, iteration performance is
  only down for HTTP, it's significantly improved for HTTP/2).

- Memory is down. The implementation with TreeMap uses on avg ~30% less memory. It also does not
  produce any garbage while being resized. In load tests for GRPC we have seen a memory reduction
  of up to 1.2KB per RPC. I summarized the memory improvements in this spreadsheet [1]. The data
  was generated by [2] using JOL.

- While it was my original intend to only improve the memory usage for HTTP/2, it should be similarly
  improved for HTTP, SPDY and STOMP as they all share a common implementation.

[1] https://docs.google.com/spreadsheets/d/1ck3RQklyzEcCLlyJoqDXPCWRGVUuS-ArZf0etSXLVDQ/edit#gid=0
[2] https://gist.github.com/buchgr/4458a8bdb51dd58c82b4
2015-08-04 17:12:24 -07:00
Ning Sun
9236a8d156 (fix) typo 2015-07-30 12:49:25 +02:00
Scott Mitchell
a7713069a1 HttpObjectDecoder performance improvements
Motivation:
The HttpObjectDecoder is on the hot code path for the http codec. There are a few hot methods which can be modified to improve performance.

Modifications:
- Modify AppendableCharSequence to provide unsafe methods which don't need to re-check bounds for every call.
- Update HttpObjectDecoder methods to take advantage of new AppendableCharSequence methods.

Result:
Peformance boost for decoding http objects.
2015-07-29 23:26:26 -07:00
Daniel Darabos
623d9d7202 Fix typo in warning message. 2015-07-29 18:38:33 +02:00
nmittler
296649cfc8 Make PrimitiveCollections generated for all primitive maps.
Motivation:

We should support XXXCollections methods for all primitive map types.

Modifications:

Removed PrimitiveCollections and added a template for XXXCollections.

Result:

Fixes #4001
2015-07-27 06:59:23 -07:00
nmittler
93fc3c6e45 Make IntObjectHashMap extend Map
Motivation:

It would be useful to support the Java `Map` interface in our primitive maps.

Modifications:

Renamed current methods to "pXXX", where p is short for "primitive". Made the template for all primitive maps extend the appropriate Map interface.

Result:

Fixes #3970
2015-07-22 15:52:27 -07:00
Norman Maurer
05dae57ad7 Ensure cancelled scheduled tasks can be GC'ed ASAP
Motivation:

Prior we used a purge task that would remove previous canceled scheduled tasks from the internal queue. This could introduce some delay and so use a lot of memory even if the task itself is already canceled.

Modifications:

Schedule removal of task from queue via EventLoop if cancel operation is not done in the EventLoop Thread or just remove directly if the Thread that cancels the scheduled task is in the EventLoop.

Result:

Faster possibility to GC a canceled ScheduledFutureTask.
2015-07-19 16:51:12 +02:00
Norman Maurer
81fee66c78 Let PoolThreadCache work even if allocation and deallocation Thread are different
Motivation:

PoolThreadCache did only cache allocations if the allocation and deallocation Thread were the same. This is not optimal as often people write from differen thread then the actual EventLoop thread.

Modification:

- Add MpscArrayQueue which was forked from jctools and lightly modified.
- Use MpscArrayQueue for caches and always add buffer back to the cache that belongs to the allocation thread.

Result:

ThreadPoolCache is now also usable and so gives performance improvements when allocation and deallocation thread are different.

Performance when using same thread for allocation and deallocation is noticable worse then before.
2015-05-27 14:38:11 +02:00
Norman Maurer
08d234cdf0 [#3805] Fix incorrect javadoc in PlatformDependent 2015-05-25 21:42:31 +02:00
Norman Maurer
271af7c624 Expose metrics for PooledByteBufAllocator
Motivation:

The PooledByteBufAllocator is more or less a black-box atm. We need to expose some metrics to allow the user to get a better idea how to tune it.

Modifications:

- Expose different metrics via PooledByteBufAllocator
- Add *Metrics interfaces

Result:

It is now easy to gather metrics and detail about the PooledByteBufAllocator and so get a better understanding about resource-usage etc.
2015-05-20 21:06:17 +02:00
Norman Maurer
e71e40057f Fix possible IllegalStateException caused by closeNotifyTimeout when using SslHandler
Motivation:

In the SslHandler we schedule a timeout at which we close the Channel if a timeout was detected during close_notify. Because this can race with notify the flushFuture we can see an IllegalStateException when the Channel is closed.

Modifications:

- Use a trySuccess() and tryFailure(...) to guard against race.

Result:

No more race.
2015-05-06 21:50:16 +02:00
yz_liu
488d905598 fix a typo in RecyclableArrayList 2015-05-06 09:07:48 +02:00
Norman Maurer
cf66edb3a1 [#3675] Fix livelock issue in MpscLinkedQueue
Motivation:

All read operations should be safe to execute from multiple threads which was not the case and so could produce a livelock.

Modifications:

Modify methods so these are safe to be called from multiple threads.

Result:

No more livelock.
2015-05-06 06:21:14 +02:00
Trustin Lee
63a02fc04e Revamp DNS codec
Motivation:

There are various known issues in netty-codec-dns:

- Message types are not interfaces, which can make it difficult for a
  user to implement his/her own message implementation.
- Some class names and field names do not match with the terms in the
  RFC.
- The support for decoding a DNS record was limited. A user had to
  encode and decode by him/herself.
- The separation of DnsHeader from DnsMessage was unnecessary, although
  it is fine conceptually.
- Buffer leak caused by DnsMessage was difficult to analyze, because the
  leak detector tracks down the underlying ByteBuf rather than the
  DnsMessage itself.
- DnsMessage assumes DNS-over-UDP.
- To send an EDNS message, a user have to create a new DNS record class
  instance unnecessarily.

Modifications:

- Make all message types interfaces and add default implementations
- Rename some classes, properties, and constants to match the RFCs
  - DnsResource -> DnsRecord
  - DnsType -> DnsRecordType
  - and many more
- Remove DnsClass and use an integer to support EDNS better
- Add DnsRecordEncoder/DnsRecordDecoder and their default
  implementations
  - DnsRecord does not require RDATA to be ByteBuf anymore.
  - Add DnsRawRecord as the catch-all record type
- Merge DnsHeader into DnsMessage
- Make ResourceLeakDetector track AbstractDnsMessage
- Remove DnsMessage.sender/recipient properties
  - Wrap DnsMessage with AddressedEnvelope
  - Add DatagramDnsQuest and DatagramDnsResponse for ease of use
  - Rename DnsQueryEncoder to DatagramDnsQueryEncoder
  - Rename DnsResponseDecoder to DatagramDnsResponseDecoder
- Miscellaneous changes
  - Add StringUtil.TAB

Result:

- Cleaner APi
- Can support DNS-over-TCP more easily in the future
- Reduced memory footprint in the default DnsQuery/Response
  implementations
- Better leak tracking for DnsMessages
- Possibility to introduce new DnsRecord types in the future and provide
  full record encoder/decoder implementation.
- No unnecessary instantiation for an EDNS pseudo resource record
2015-05-01 11:33:16 +09:00
JongYoon Lim
a5c8e145ee Remove the condition which is always true when reached
Motivation:
Condition 'isNextCharDoubleQuote' is always 'true' when reached.

Motification:
- Removed Condition 'isNextCharDoubleQuote'.
- Additionally fixed typo in javadoc

Result:
Cleaner code.
2015-04-30 16:58:39 -07:00
Norman Maurer
56c98839c3 [#3218] Add ChannelPool / ChannelPoolMap abstraction and implementations
Motivation:

Many projects need some kind a Channel/Connection pool implementation. While the protocols are different many things can be shared, so we should provide a generic API and implementation.

Modifications:

Add ChannelPool / ChannelPoolMap API and implementations.

Result:

Reusable / Generic pool implementation that users can use.
2015-04-30 12:13:19 +02:00
JongYoon Lim
05f9593352 Remove the unreachable checking code
Motivation:
'length2 == 0' is not reachable because length1 and length2 are same at this point.

Motification:
Removed 'length2 == 0'.

Result:
Cleaner code.
2015-04-30 07:43:26 +02:00
JongYoon Lim
c4d69e982b Remove duplicate code in ConstantPool class
Motivation:

Currently, valueOf() and newInstance() use almost same code to create new constant.
For maintainability, it's better to share duplicate code among them.

Motification:

Added new private functions.
- checkNotNullAndNotEmpty() is for checking whether the name of a constant is null and empty.
- newConstant0() is for creating a new constant.

Result:

- Compact source code
- Improvement of maintainability
2015-04-29 08:03:37 +02:00
Norman Maurer
f67b14bf35 [#3680] Enabled SecurityManager results in ClassNotFoundError during io.netty.util.NetUtil initialization
Motivation:

When a SecurityManager is in place that preven reading the somaxconn file trying to bootstrap a channel later will result in a ClassNotFoundError.

Modifications:

- Reading the file in a privileged block.

Result:

No more ClassNotFoundError when a SecurityManager is in place.
2015-04-27 20:02:07 +02:00
Scott Mitchell
f812180c2d ByteString arrayOffset method
Motivation:
The ByteString class currently assumes the underlying array will be a complete representation of data. This is limiting as it does not allow a subsection of another array to be used. The forces copy operations to take place to compensate for the lack of API support.

Modifications:
- add arrayOffset method to ByteString
- modify all ByteString and AsciiString methods that loop over or index into the underlying array to use this offset
- update all code that uses ByteString.array to ensure it accounts for the offset
- add unit tests to test the implementation respects the offset

Result:
ByteString and AsciiString can represent a sub region of a byte[].
2015-04-24 18:54:01 -07:00
Norman Maurer
a7d1dc362a [#3652] Improve performance of StringUtil.simpleClassName()
Motivation:

static Package getPackage(Class<?> c) uses synchronized block internally.
Thanks to @jingene for the hint and initial report of the issue.

Modifications:

-Use simple lastIndexOf(...) and substring for a faster implementation

Result:

No more lock condition.
2015-04-22 09:14:40 +02:00
Norman Maurer
b4b14ea19f Ensure backward-compability with 4.0
Motivation:

Each different *ChannelOption did extend ChannelOption in 4.0, which we changed in 4.1. This is a breaking change in terms of the API so we need to ensure we keep the old hierarchy.

Modifications:

- Let all *ChannelOption extend ChannelOption
- Add back constructor and mark it as @deprecated

Result:

No API breakage between 4.0 and 4.1
2015-04-19 13:25:42 +02:00
Trustin Lee
e48e6e4509 Fix checkstyle 2015-04-17 11:39:36 +09:00
Jakob Buchgraber
c2de195f87 Improve performance of AsciiString.equals(Object).
Motivation:

The current implementation does byte by byte comparison, which we have seen
can be a performance bottleneck when the AsciiString is used as the key in
a Map.

Modifications:

Use sun.misc.Unsafe (on supporting platforms) to compare up to eight bytes at a time
and get closer to the performance of String.equals(Object).

Result:

Significant improvement (2x - 6x) in performance over the current implementation.

Benchmark                                             (size)   Mode   Samples        Score  Score error    Units
i.n.m.i.PlatformDependentBenchmark.arraysBytesEqual       10  thrpt        10 118843477.518 2347259.347    ops/s
i.n.m.i.PlatformDependentBenchmark.arraysBytesEqual       50  thrpt        10 43910319.773   198376.996    ops/s
i.n.m.i.PlatformDependentBenchmark.arraysBytesEqual      100  thrpt        10 26339969.001   159599.252    ops/s
i.n.m.i.PlatformDependentBenchmark.arraysBytesEqual     1000  thrpt        10  2873119.030    20779.056    ops/s
i.n.m.i.PlatformDependentBenchmark.arraysBytesEqual    10000  thrpt        10   306370.450     1933.303    ops/s
i.n.m.i.PlatformDependentBenchmark.arraysBytesEqual   100000  thrpt        10    25750.415      108.391    ops/s
i.n.m.i.PlatformDependentBenchmark.unsafeBytesEqual       10  thrpt        10 248077563.510  635320.093    ops/s
i.n.m.i.PlatformDependentBenchmark.unsafeBytesEqual       50  thrpt        10 128198943.138  614827.548    ops/s
i.n.m.i.PlatformDependentBenchmark.unsafeBytesEqual      100  thrpt        10 86195621.349  1063959.307    ops/s
i.n.m.i.PlatformDependentBenchmark.unsafeBytesEqual     1000  thrpt        10 16920264.598    61615.365    ops/s
i.n.m.i.PlatformDependentBenchmark.unsafeBytesEqual    10000  thrpt        10  1687454.747     6367.602    ops/s
i.n.m.i.PlatformDependentBenchmark.unsafeBytesEqual   100000  thrpt        10   153717.851      586.916    ops/s
2015-04-16 17:29:54 -07:00
Roger Kapsi
221a9f50d4 Fix for ByteString#hashCode()
Motivation:

ByteString#hashCode() trashes its own hash code if it's being accessed concurrently

Modifications:

Pull the ByteString#hash into a local variable and calculate it locally.

Result:

ByteString#hashCode() is no longer returning a junk value.
2015-04-16 17:00:44 -07:00
nmittler
7aac50a79a Optimizing KObjectHashMap hashIndex()
Motivation:

The IntObjectHashMap benchmarks show the Agrona collections to be faster on put, lookup, and remove. One major difference is that we're using 2 modulus operations each time we increment the position index while iterating.  Agrona uses a mask instead.

Modifications:

Modified the KObjectHashMap to use masking rather than modulus when wrapping the position index. This requires that the capacity be a power of 2.

Result:

Improved performance of IntObjectHashMap.
2015-04-16 10:27:17 -07:00
Scott Mitchell
9a7a85dbe5 ByteString introduced as AsciiString super class
Motivation:
The usage and code within AsciiString has exceeded the original design scope for this class. Its usage as a binary string is confusing and on the verge of violating interface assumptions in some spots.

Modifications:
- ByteString will be created as a base class to AsciiString. All of the generic byte handling processing will live in ByteString and all the special character encoding will live in AsciiString.

Results:
The AsciiString interface will be clarified. Users of AsciiString can now be clear of the limitations the class imposes while users of the ByteString class don't have to live with those limitations.
2015-04-14 16:35:17 -07:00
Norman Maurer
0d9ba81c06 Document the contract of Attribute.getAndSet(...) and set(...)
Motivation:

Attribute.getAndRemove() will return the value but also remove the AttributeKey itself from the AttributeMap. This may not
what you want as you may want to keep an instance of it and just set it later again. Document the contract so the user know what to expect.

Modifications:

- Make it clear when to use AttributeKey.getAndRemove() / AttributeKey.remove() and when AttributeKey.getAndSet(null) / AttributeKey.set(null).

Result:

Less suprising behaviour.
2015-04-14 09:53:53 +02:00
Norman Maurer
aebbb862ac Add support for ALPN when using openssl + NPN client mode and support for CipherSuiteFilter
Motivation:

To support HTTP2 we need APLN support. This was not provided before when using OpenSslEngine, so SSLEngine (JDK one) was the only bet.
Beside this CipherSuiteFilter was not supported

Modifications:

- Upgrade netty-tcnative and make use of new features to support ALPN and NPN in server and client mode.
- Guard against segfaults after the ssl pointer is freed
- support correctly different failure behaviours
- add support for CipherSuiteFilter

Result:

Be able to use OpenSslEngine for ALPN / NPN for server and client.
2015-04-10 18:52:34 +02:00
nmittler
3354296c9f Auto-generating primitive collections for int and char keys.
Motivation:

Currently we have IntObjectMap/HashMap, but it will be useful to support other primitive-based maps.

Modifications:

Moved the code int the current maps to template files and run Groovy code from  common/pom.xml to apply the templates.

Result:

Autogeneration of int and char-based hash maps.
2015-04-10 07:57:30 -07:00
Jakob Buchgraber
e40c27d9ed Avoid object allocations for HTTP2 child streams.
Motivation:

We are allocating a hash map for every HTTP2 Stream to store it's children.
Most streams are leafs in the priority tree and don't have children.

Modification:

 - Only allocate children when we actually use them.
 - Make EmptyIntObjectMap not throw a UnsupportedOperationException on remove, but return null instead (as is stated in it's javadoc).

Result:

Fewer unnecessary allocations.
2015-04-03 11:57:31 -07:00
Scott Mitchell
330bc39d91 Backporting PrimitiveCollections class
Motivation:
PrimitiveCollections is not in the 4.1 branch.  It is needed by HTTP/2.

Modifications:
Backport this class.

Result:
PrimitiveCollections is in 4.1.
2015-04-03 11:57:09 -07:00
nmittler
ef729e7021 Allow non-standard HTTP/2 settings
Motivation:

The Http2Settings class currently disallows setting non-standard settings, which violates the spec.

Modifications:

Updated Http2Settings to permit arbitrary settings. Also adjusting the default initial capacity to allow setting all of the standard settings without reallocation.

Result:

Fixes #3560
2015-04-02 11:10:47 -07:00
Norman Maurer
3df7b4dac7 Respect -Djava.net.preferIPv4Stack when using epoll transport
Motivation:

On a system where ipv4 and ipv6 are supported a user may want to use -Djava.net.preferIPv4Stack=true to restrict it to use ipv4 only.
This is currently ignored with the epoll transport.

Modifications:

Respect java.net.preferIPv4Stack system property.

Result:

-Djava.net.preferIPv4Stack=true will have the effect the user is looking for.
2015-03-11 02:50:11 +01:00
Norman Maurer
0767da12fb Fix possible AttributeMap corruption on double removal
Motivation:

When remove0() is called multiple times for an DefaultAttribute it can cause corruption of the internal linked-list structure.

Modifications:

- Ensure remove0() can not cause corruption by null out prev and next references.

Result:

No more corruption possible
2015-03-10 05:08:41 +01:00
Norman Maurer
a709553819 Allow to use EmbeddedChannel.schedule*(...)
Motivation:

At the moment when EmbeddedChannel is used and a ChannelHandler tries to schedule and task it will throw an UnsupportedOperationException. This makes it impossible to test these handlers or even reuse them with EmbeddedChannel.

Modifications:

- Factor out reusable scheduling code into AbstractSchedulingEventExecutor
- Let EmbeddedEventLoop and SingleThreadEventExecutor extend AbstractSchedulingEventExecutor
- add EmbbededChannel.runScheduledPendingTasks() which allows to run all scheduled tasks that are ready

Result:

Embeddedchannel is now usable even with ChannelHandler that try to schedule tasks.
2015-02-20 11:57:32 +01:00
Daniel Bevenius
c53b8d5a85 Suggestion for supporting single header fields.
Motivation:
At the moment if you want to return a HTTP header containing multiple
values you have to set/add that header once with the values wanted. If
you used set/add with an array/iterable multiple HTTP header fields will
be returned in the response.

Note, that this is indeed a suggestion and additional work and tests
should be added. This is mainly to bring up a discussion.

Modifications:
Added a flag to specify that when multiple values exist for a single
HTTP header then add them as a comma separated string.
In addition added a method to StringUtil to help escape comma separated
value charsequences.

Result:
Allows for responses to be smaller.
2015-02-18 10:54:15 +01:00
Norman Maurer
99bd43ed51 Allow to get existing ChannelOption / AttributeKey from String
Motivation:

We should allow to get a ChannelOption/AttributeKey from a String. This will make it a lot easier to make use of configuration files in applications.

Modifications:

- Add exists(...), newInstance(...) method to ChannelOption and AttributeKey and alter valueOf(...) to return an existing instance for a String or create one.
- Add unit tests.

Result:

Much more flexible usage of ChannelOption and AttributeKey.
2015-02-18 09:29:37 +01:00
Trustin Lee
976db9269d Revamp io.netty.handler.codec.socksx
While implementing netty-handler-proxy, I realized various issues in our
current socksx package. Here's the list of the modifications and their
background:

- Split message types into interfaces and default implementations
  - so that a user can implement an alternative message implementations
- Use classes instead of enums when a user might want to define a new
  constant
  - so that a user can extend SOCKS5 protocol, such as:
    - defining a new error code
    - defining a new address type
- Rename the message classes
  - to avoid abbreviated class names. e.g:
    - Cmd -> Command
    - Init -> Initial
  - so that the class names align better with the protocol
    specifications. e.g:
    - AuthRequest -> PasswordAuthRequest
    - AuthScheme -> AuthMethod
- Rename the property names of the messages
  - so that the property names align better when the field names in the
    protocol specifications
- Improve the decoder implementations
  - Give a user more control over when a decoder has to be removed
  - Use DecoderResult and DecoderResultProvider to handle decode failure
    gracefully. i.e. no more Unknown* message classes
- Add SocksPortUnifinicationServerHandler since it's useful to the users
  who write a SOCKS server
  - Cleaned up and moved from the socksproxy example
2015-02-10 09:14:13 +09:00
Trustin Lee
a1efd1871b Reorder PlatformDependent.isRoot() check
Motivation:

isRoot() is an expensive operation. We should avoid calling it if
possible.

Modifications:

Move the isRoot() checks to the end of the 'if' block, so that isRoot()
is evaluated only when really necessary.

Result:

isRoot() is evaluated only when SO_BROADCAST is set and the bind address
is anylocal address.
2015-02-08 12:00:16 +09:00
Marco Craveiro
6d07264412 Minor idiomatic changes to java docs 2015-02-04 08:28:29 +01:00
Trustin Lee
279187ba5e Make NetUtil.isValidIp4Word() private
We have deprecated NetUtil.isValidIp4Word() in 4.0. See:

- b0747e7432
2015-01-20 16:46:51 +09:00
Trustin Lee
98731a51c8 Add the URL of the wiki for easier troubleshooting
Motivation:

When a user sees an error message, sometimes he or she does not know
what exactly he or she has to do to fix the problem.

Modifications:

Log the URL of the wiki pages that might help the user troubleshoot.

Result:

We are more friendly.
2015-01-08 12:45:34 +09:00
Daniel Bevenius
2a426b3d44 Fixing minor typo in FastThreadLocal javadoc. 2014-12-08 13:52:54 +01:00
Trustin Lee
7f92771496 Fix a bug where Recycler's capacity can increase beyond its maximum
Related: #3166

Motivation:

When the recyclable object created at one thread is returned at the
other thread, it is stored in a WeakOrderedQueue.

The objects stored in the WeakOrderedQueue is added back to the stack by
WeakOrderedQueue.transfer() when the owner thread ran out of recyclable
objects.

However, WeakOrderedQueue.transfer() does not have any mechanism that
prevents the stack from growing beyond its maximum capacity.

Modifications:

- Make WeakOrderedQueue.transfer() increase the capacity of the stack
  only up to its maximum
- Add tests for the cases where the recyclable object is returned at the
  non-owner thread
- Fix a bug where Stack.scavengeSome() does not scavenge the objects
  when it's the first time it ran out of objects and thus its cursor is
  null.
- Overall clean-up of scavengeSome() and transfer()

Result:

The capacity of Stack never increases beyond its maximum.
2014-12-06 17:58:31 +09:00
Greg Gibeling
a79466769f Lazily check for root, avoids unnecessary errors & resources
Motivation:

io.netty.util.internal.PlatformDependent.isRoot() depends on the IS_ROOT field which is filled in during class initialization. This spawns processes and consumes resources, which are not generally necessary to the complete functioning of that class.

Modifications:

This switches the class to use lazy initialization this field inside of the isRoot() method using double-checked locking (http://en.wikipedia.org/wiki/Double-checked_locking).

Result:

The first call to isRoot() will be slightly slower, at a tradeoff that class loading is faster, uses fewer resources and platform errors are avoided unless necessary.
2014-12-05 09:17:06 +01:00
Trustin Lee
bd8a5bc9b3 Add missing @Override annotation 2014-12-04 20:53:14 +09:00
Trustin Lee
70a91c72c4 Fix checkstyle 2014-12-04 18:40:50 +09:00
Trustin Lee
bf58f871c3 Overall clean-up of the initial SniHandler/DomainNameMapping work
- Parameterize DomainNameMapping to make it useful for other use cases
  than just mapping to SslContext
- Move DomainNameMapping to io.netty.util
- Clean-up the API documentation
- Make SniHandler.hostname and sslContext volatile because they can be
  accessed by non-I/O threads
2014-12-04 18:23:07 +09:00
Sun Ning
8f77c80795 Added support for SSL Server Name Indication.
Motivation:

When we need to host multiple server name with a single IP, it requires
the server to support Server Name Indication extension to serve clients
with proper certificate. So the SniHandler will host multiple
SslContext(s) and append SslHandler for requested hostname.

Modification:

* Added SniHandler to host multiple certifications in a single server
* Test case

Result:

User could use SniHandler to host multiple certifcates at a time.
It's server-side only.
2014-12-03 11:03:15 +01:00
Sam Young
a37c4ad7f4 Add @SafeVarargs to PromiseAggregator#add and PromiseNotifier#(...) https://github.com/netty/netty/issues/3147
Motivation:

8fbc513 introduced stray warnings in callsites of
PromiseAggregator#add and PromiseNotifier#(...).

Modifications:

This commit adds the @SafeVarargs annotation to PromiseAggregator#add
and PromiseNotifier#(...). As Netty is built with JDK7, this is a
recognized annotation and should not affect runtime VM versions 1.5 and
1.6.

Result:

Building Netty with JDK7 will no longer produce warnings in the
callsites mentioned above.
2014-12-01 19:59:41 +01:00
Trustin Lee
247d5b1bd9 Fix awful naming 2014-11-22 07:46:59 +09:00
Trustin Lee
040c340f76 Add back IntObjectMap.values(Class<V>)
Motivation:

Although the new IntObjectMap.values() that returns Collection is
useful, the removed values(Class<V>) that returns an array is also
useful. It's also good for backward compatibility.

Modifications:

- Add IntObjectMap.values(Class<V>) back
- Miscellaneous improvements
  - Cache the collection returned by IntObjectHashMap.values()
  - Inspector warnings
- Update the IntObjectHashMapTest to test both values()

Result:

- Backward compatibility
- Potential performance improvement of values()
2014-11-22 07:42:14 +09:00
Trustin Lee
9da4250917 Backport the IntObjectHashMap changes in f23f3b9617
Motivation:

The mentioned commit contains a bug fix and an improvement in
IntObjectHashMap that requires backporting.

Modifications:

Update IntObjectMap, IntObjectHashMap, and IntObjectHashMapTest

Result:

Easier to backport HTTP/2 and other changes in master in the future
2014-11-21 11:07:24 +09:00
Idel Pivnitskiy
35db3c6710 Small performance improvements
Motivation:

Found performance issues via FindBugs and PMD.

Modifications:

- Removed unnecessary boxing/unboxing operations in DefaultTextHeaders.convertToInt(CharSequence) and DefaultTextHeaders.convertToLong(CharSequence). A boxed primitive is created from a string, just to extract the unboxed primitive value.
- Added a static modifier for DefaultHttp2Connection.ParentChangedEvent class. This class is an inner class, but does not use its embedded reference to the object which created it. This reference makes the instances of the class larger, and may keep the reference to the creator object alive longer than necessary.
- Added a static compiled Pattern to avoid compile it each time it is used when we need to replace some part of authority.
- Improved using of StringBuilders.

Result:

Performance improvements.
2014-11-20 00:10:06 -05:00
Trustin Lee
4279efde59 Handle the interface name in IPv6 address correctly
Motivation:

NetUtil.isValidIpV6Address() handles the interface name in IPv6 address
incorrectly. For example, it returns false for the following addresses:

- ::1%lo
- ::1%_%_in_name_

Modifications:

- Strip the square brackets before validation for simplicity
- Strip the part after the percent sign completely before validation for
  simplicity
- Simplify and reformat NetUtilTest

Result:

- The interface names in IPv6 addresses are handled correctly.
- NetUtilTest is cleaner
2014-11-12 12:13:22 +09:00
Sam Young
9ba3126bd4 Add generic versions of PromiseAggregator and PromiseNotifier.
Motivation:

ChannelPromiseAggregator and ChannelPromiseNotifiers only allow
consumers to work with Channels as the result type. Generic versions
of these classes allow consumers to aggregate or broadcast the results
of an asynchronous execution with other result types.

Modifications:

Add PromiseAggregator and PromiseNotifier. Add unit tests for both.
Remove code in ChannelPromiseAggregator and ChannelPromiseNotifier and
modify them to extend the new base classes.

Result:

Consumers can now aggregate or broadcast the results of an asynchronous
execution with results types other than Channel.
2014-11-07 09:06:58 +01:00
Trustin Lee
53fbfbb590 Remove CollectionUtils
Motivation:

CollectionUtils has only one method and it is used only in DefaultHeaders.

Modification:

Move CollectionUtils.equals() to DefaultHeaders and make it private

Result:

One less class to expose in our public API
2014-11-01 02:59:47 +09:00
Scott Mitchell
50e06442c3 Backport header improvements from 5.0
Motivation:
The header class hierarchy and algorithm was improved on the master branch for versions 5.x. These improvments should be backported to the 4.1 baseline.

Modifications:
- cherry-pick the following commits from the master branch: 2374e17, 36b4157, 222d258

Result:
Header improvements in master branch are available in 4.1 branch.
2014-11-01 00:59:57 +09:00
Scott Mitchell
04f77b76f8 Backport ALPN and Mutual Auth SSL
Motivation:

Improvements were made on the main line to support ALPN and mutual
authentication for TLS. These should be backported.

Modifications:

- Backport commits from the master branch
  - f8af84d599
  - e74c8edba3

Result:

Support for ALPN and mutual authentication.
2014-10-31 12:52:26 +09:00
Scott Mitchell
7e65c09373 IPv6 address to string rfc5952
Motivation:
The java implementations for Inet6Address.getHostName() do not follow the RFC 5952 (http://tools.ietf.org/html/rfc5952#section-4) for recommended string representation. This introduces inconsistencies when integrating with other technologies that do follow the RFC.

Modifications:
-NetUtil.java to have another public static method to convert InetAddress to string. Inet4Address will use the java InetAddress.getHostAddress() implementation and there will be new code to implement the RFC 5952 IPV6 string conversion.
-New unit tests to test the new method

Result:
Netty provides a RFC 5952 compliant string conversion method for IPV6 addresses
2014-10-30 00:05:57 -04:00
Frederic Bregier
eb415fded6 V4.1 Fix "=" character in HttpPostRequestDecoder
Motivation
Issue #3004 shows that "=" character was not supported as it should in
the HttpPostRequestDecoder in form-data boundary.

Modifications:
Add 2 methods in StringUtil
- split with maxPart argument: String split with max parts only (to prevent multiple '='
to be source of extra split while not needed)
- substringAfter: String part after delimiter (since first part is not
needed)
Use those methods in HttpPostRequestDecoder.
Change and the HttpPostRequestDecoderTest to check using a boundary
beginning with "=".

Results:
The fix implies more stability and fix the issue.
2014-10-21 16:06:37 +09:00
nmittler
f3ef94d35e Slight performance improvement to IntObjectHashMap.hashIndex()
Motivation:

Using a needless local copy of keys.length.

Modifications:

Using keys.length explicitly everywhere.

Result:

Slight performance improvement of hashIndex.
2014-10-20 12:40:01 -07:00
nmittler
30060b6083 Optimize IntObjectHashMap handling of negative keys.
Motivation:

The hashIndex method currently uses a conditional to handle negative
keys. This could be done without a conditional to slightly improve
performance.

Modifications:

Modified hashIndex() to avoid using a conditional.

Result:

Slight performance improvement to hashIndex().
2014-10-20 11:00:41 -07:00
nmittler
dd5b2c30c5 Allowing negative keys in IntObjectHashMap.
Motivation:

IntObjectHashMap throws an exception when using negative values for
keys.

Modifications:

Changed hashIndex() to normalize the index if the mod operation returns
a negative number.

Result:

IntObjectHashMap supports negative key values.
2014-10-20 18:06:48 +02:00
Trustin Lee
9839990fff Fix a bug in NetUtil.createByteArrayFromIpAddressString()
Motivation:

An IPv6 string can have a zone index which is followed by the '%' sign.
When a user passes an IPv6 string with a zone index,
NetUtil.createByteArrayFromIpAddressString() returns an incorrect value.

Modification:

- Strip the zone index before conversion

Result:

An IPv6 string with a zone index is decoded correctly.
2014-10-14 12:29:08 +09:00
Amir Szekely
98a533ae44 Don't ignore maxCapacity if it's not a power of 2
Motivation:

This fixes bug #2848 which caused Recycler to become unbounded and cache infinite number of objects with maxCapacity that's not a power of two. This can result in general sluggishness of the application and OutOfMemoryError.

Modifications:

The test for maxCapacity has been moved out of test to check if the buffer has filled. The buffer is now also capped at maxCapacity and cannot grow over it as it jumps from one power of two to the other.

Additionally, a unit test was added to verify maxCapacity is honored even when it's not a power of two.

Result:

With these changes the user is able to use a custom maxCapacity number and not have it ignored. The unit test assures this bug will not repeat itself.
2014-08-31 09:06:45 +02:00
Norman Maurer
09100e5043 Avoid redundant reads of head in peakNode
Motivation:

There is not need todo redunant reads of head in peakNode as we can just spin on next() until it becomes visible.

Modifications:

Remove redundant reads of head in peakNode. This is based on @nitsanw's patch for akka.
See https://github.com/akka/akka/pull/15596

Result:

Less volatile access.
2014-08-21 09:01:22 +02:00
Norman Maurer
2c9d1dafac Code-inspection fixes
Motivation:

Saw some code-inspection warnings

Modifications:

Fix warnings

Result:

Less code-inspection warnings
2014-08-21 07:32:05 +02:00
Norman Maurer
a9da2f9d8b Document the correct default value of SOMAXCONN
Motivation:

Recently we changed the default value of SOMAXCONN that is used when we can not determine it by reading /proc/sys/net/core/somaxconn. While doing this we missed to update the javadocs to reflect the new default value that is used.

Modifications:

List correct default value in the javadocs of SOMAXCONN.

Result:

Correct javadocs.
2014-08-18 06:02:36 +02:00
Trustin Lee
dcd3cadeaa Reduce the fallback SOMAXCONN value
Related issue: #2407

Motivation:

The current fallback SOMAXCONN value is 3072.  It is way too large
comparing to the default SOMAXCONN value of popular OSes.

Modifications:

Decrease the fallback SOMAXCONN value to 128 or 200 depending on the
current OS

Result:

Saner fallback value
2014-08-14 15:42:10 -07:00
Trustin Lee
8fce6316ad Fix a bug where ChannelFuture.setFailure(null) doesn't fail
Motivation:

We forgot to do a null check on the cause parameter of
ChannelFuture.setFailure(cause)

Modifications:

Add a null check

Result:

Fixed issue: #2728
2014-08-05 11:23:45 -07:00
Norman Maurer
869687bd71 Port ChannelOutboundBuffer and related changes from 4.0
Motivation:

We did various changes related to the ChannelOutboundBuffer in 4.0 branch. This commit port all of them over and so make sure our branches are synced in terms of these changes.

Related to [#2734], [#2709], [#2729], [#2710] and [#2693] .

Modification:
Port all changes that was done on the ChannelOutboundBuffer.

This includes the port of the following commits:
 - 73dfd7c01b
 - 997d8c32d2
 - e282e504f1
 - 5e5d1a58fd
 - 8ee3575e72
 - d6f0d12a86
 - 16e50765d1
 - 3f3e66c31a

Result:
 - Less memory usage by ChannelOutboundBuffer
 - Same code as in 4.0 branch
 - Make it possible to use ChannelOutboundBuffer with Channel implementation that not extends AbstractChannel
2014-08-05 15:00:45 +02:00
Trustin Lee
a5ccec5ef3 More brief somaxconn logging
- Consistent log message format
- Avoid unnecessary autoboxing when debug level is off
- Remove the duplication of somaxconn path
2014-08-04 10:27:13 -07:00
Norman Maurer
ff9cc74bf6 Remove duplicated code 2014-07-31 18:11:12 -07:00
Norman Maurer
1f95e5db4c [#2720] Check if /proc/sys/net/core/somaxconn exists before try to parse it
Motivation:

As /proc/sys/net/core/somaxconn does not exists on non-linux platforms you see a noisy stacktrace when debug level is enabled while the static method of NetUtil is executed.

Modifications:

Check if the file exists before try to parse it.

Result:

Less noisy logging on non-linux platforms.
2014-07-31 18:08:54 -07:00
Trustin Lee
3c4321ce43 Use our own URL shortener wherever possible 2014-07-31 17:06:19 -07:00
Trustin Lee
77609cf6ed Fix a bug where AbstractConstant.compareTo() returns 0 for different constants
Related issue: #2354

Motivation:

AbstractConstant.compareTo() can return 0 even if the specified constant
object is not the same instance with 'this'.

Modifications:

- Compare the identityHashCode of constant first. If that fails,
  allocate a small direct buffer and use its memory address as a unique
  value.  If the platform does not provide a way to get the memory
  address of a direct buffer, use a thread-local random value.
- Signal cannot extend AbstractConstant. Use delegation.

Result:

It is practically impossible for AbstractConstant.compareTo() to return
0 for different constant objects.
2014-07-29 15:01:47 -07:00
Norman Maurer
88bd6e7a93 Optimize native transport for gathering writes
Motivation:

While benchmarking the native transport with gathering writes I noticed that it is quite slow. This is due the fact that we need to do a lot of array copies to get the buffers into the iov array.

Modification:

Introduce a new class calles IovArray which allows to fill buffers directly in a iov array that can be passed over to JNI without any array copies. This gives a nice optimization in terms of speed when doing gathering writes.

Result:

Big performance improvement when doing gathering writes. See the included benchmark...

Before:
[nmaurer@xxx]~% wrk/wrk -H 'Host: localhost' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' -H 'Connection: keep-alive' -d 120 -c 256 -t 16 --pipeline 256  http://xxx:8080/plaintext
Running 2m test @ http://xxx:8080/plaintext
  16 threads and 256 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    23.44ms   16.37ms 259.57ms   91.77%
    Req/Sec   181.99k    31.69k  304.60k    78.12%
  346544071 requests in 2.00m, 46.48GB read
Requests/sec: 2887885.09
Transfer/sec:    396.59MB

With this change:
[nmaurer@xxx]~% wrk/wrk -H 'Host: localhost' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' -H 'Connection: keep-alive' -d 120 -c 256 -t 16 --pipeline 256  http://xxx:8080/plaintext
Running 2m test @ http://xxx:8080/plaintext
  16 threads and 256 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    21.93ms   16.33ms 305.73ms   92.34%
    Req/Sec   194.56k    33.75k  309.33k    77.04%
  369617503 requests in 2.00m, 49.57GB read
Requests/sec: 3080169.65
Transfer/sec:    423.00MB
2014-07-25 09:55:02 +02:00
Norman Maurer
5b2bdd844d [#2662] Fix race in cancellation of TimerTasks which could let to NPE
Motivation:

Due some race-condition while handling canellation of TimerTasks it was possibleto corrupt the linked-list structure that is represent by HashedWheelBucket and so produce a NPE.

Modification:

Fix the problem by adding another MpscLinkedQueue which holds the cancellation tasks and process them on each tick. This allows to use no synchronization / locking at all while introduce a latency of max 1 tick before the TimerTask can be GC'ed.

Result:

No more NPE
2014-07-25 06:34:35 +02:00
Osvaldo Doederlein
07024a4e4b Fixes and improvements to IntObjectHashMap. Related to [#2659]
- Rewrite with linear probing, no state array, compaction at cleanup
- Optimize keys() and values() to not use reflection
- Optimize hashCode() and equals() for efficient iteration
- Fixed equals() to not return true for equals(null)
- Optimize iterator to not allocate new Entry at each next()
- Added toString()
- Added some new unit tests
2014-07-21 16:43:15 +02:00
Idel Pivnitskiy
b83df4c6b3 Fix NPE problems
Motivation:

Now Netty has a few problems with null values.

Modifications:

- Check HAProxyProxiedProtocol in HAProxyMessage constructor and throw NPE if it is null.
If HAProxyProxiedProtocol is null we will set AddressFamily as null. So we will get NPE inside checkAddress(String, AddressFamily) and it won't be easy to understand why addrFamily is null.
- Check File in DiskFileUpload.toString().
If File is null we will get NPE when calling toString() method.
- Check Result<String> in MqttDecoder.decodeConnectionPayload(...).
If !mqttConnectVariableHeader.isWillFlag() || !mqttConnectVariableHeader.hasUserName() || !mqttConnectVariableHeader.hasPassword() we will get NPE when we will try to create new instance of MqttConnectPayload.
- Check Unsafe before calling unsafe.getClass() in PlatformDependent0 static block.
- Removed unnecessary null check in WebSocket08FrameEncoder.encode(...).
Because msg.content() can not return null.
- Removed unnecessary null check in DefaultStompFrame(StompCommand) constructor.
Because we have this check in the super class.
- Removed unnecessary null checks in ConcurrentHashMapV8.removeTreeNode(TreeNode<K,V>).
- Removed unnecessary null check in OioDatagramChannel.doReadMessages(List<Object>).
Because tmpPacket.getSocketAddress() always returns new SocketAddress instance.
- Removed unnecessary null check in OioServerSocketChannel.doReadMessages(List<Object>).
Because socket.accept() always returns new Socket instance.
- Pass Unpooled.buffer(0) instead of null inside CloseWebSocketFrame(boolean, int) constructor.
If we will pass null we will get NPE in super class constructor.
- Added throw new IllegalStateException in GlobalEventExecutor.awaitInactivity(long, TimeUnit) if it will be called before GlobalEventExecutor.execute(Runnable).
Because now we will get NPE. IllegalStateException will be better in this case.
- Fixed null check in OpenSslServerContext.setTicketKeys(byte[]).
Now we throw new NPE if byte[] is not null.

Result:

Added new null checks when it is necessary, removed unnecessary null checks and fixed some NPE problems.
2014-07-20 12:55:22 +02:00
Idel Pivnitskiy
dd429b2495 Small fixes and improvements
Motivation:

Fix some typos in Netty.

Modifications:

- Fix potentially dangerous use of non-short-circuit logic in Recycler.transfer(Stack<?>).
- Removed double 'the the' in javadoc of EmbeddedChannel.
- Write to log an exception message if we can not get SOMAXCONN in the NetUtil's static block.
2014-07-20 09:37:22 +02:00
Idel Pivnitskiy
ad1389be9d Small performance improvements
Modifications:

- Added a static modifier for CompositeByteBuf.Component.
This class is an inner class, but does not use its embedded reference to the object which created it. This reference makes the instances of the class larger, and may keep the reference to the creator object alive longer than necessary.
- Removed unnecessary boxing/unboxing operations in HttpResponseDecoder, RtspResponseDecoder, PerMessageDeflateClientExtensionHandshaker and PerMessageDeflateServerExtensionHandshaker
A boxed primitive is created from a String, just to extract the unboxed primitive value.
- Removed unnecessary 3 times calculations in DiskAttribute.addContent(...).
- Removed unnecessary checks if file exists before call mkdirs() in NativeLibraryLoader and PlatformDependent.
Because the method mkdirs() has this check inside.
- Removed unnecessary `instanceof AsciiString` check in StompSubframeAggregator.contentLength(StompHeadersSubframe) and StompSubframeDecoder.getContentLength(StompHeaders, long).
Because StompHeaders.get(CharSequence) always returns java.lang.String.
2014-07-20 09:26:04 +02:00
Norman Maurer
8b0bc7f33d [#2651] Fix possible infinite-loop when cancel tasks
Motivations:
In our new version of HWT we used some kind of lazy cancelation of timeouts by put them back in the queue and let them pick up on the next tick. This  multiple problems:
 - we may corrupt the MpscLinkedQueue if the task is used as tombstone
 - this sometimes lead to an uncessary delay especially when someone did executed some "heavy" logic in the TimeTask

Modifications:
Use a Lock per HashedWheelBucket for save and fast removal.

Modifications:
Cancellation of tasks can be done fast and so stuff can be GC'ed and no more infinite-loop possible
2014-07-11 15:41:33 +02:00
Trustin Lee
5b87cdc8bd Reduce the perceived time taken to retrieve initialSeedUniquifier
Motivation:

When system is in short of entrophy, the initialization of
ThreadLocalRandom can take at most 3 seconds.  The initialization occurs
when ThreadLocalRandom.current() is invoked first time, which might be
much later than the moment when the application has started.  If we
start the initialization of ThreadLocalRandom as early as possible, we
can reduce the perceived time taken for the retrieval.

Modification:

Begin the initialization of ThreadLocalRandom in InternalLoggerFactory,
potentially one of the firstly initialized class in a Netty application.

Make DefaultChannelId retrieve the current process ID before retrieving
the current machine ID, because retrieval of a machine ID is more likely
to use ThreadLocalRandom.current().

Use a dummy channel ID for EmbeddedChannel, which prevents many unit
tests from creating a ThreadLocalRandom instance.

Result:

We gain extra 100ms at minimum for initialSeedUniquifier generation.  If
an application has its own initialization that takes long enough time
and generates good amount of entrophy, it is very likely that we will
gain a lot more.
2014-07-04 16:04:48 +09:00
Trustin Lee
11fdec3c4a Log the time taken for generating the initialSeedUniquifier
- Sometimes useful to know it how long it takes from the log, to make
  sure it's not something else that is blocking.
2014-07-04 13:26:58 +09:00
Trustin Lee
3c6bc0b4cb Fix unclean backport in InternalLoggerFactory
.. which leaked in from d0912f2709
2014-07-02 20:27:06 +09:00
Trustin Lee
d0912f2709 Fix most inspector warnings
Motivation:

It's good to minimize potentially broken windows.

Modifications:

Fix most inspector warnings from our profile
Update IntObjectHashMap

Result:

Cleaner code
2014-07-02 19:55:07 +09:00
Norman Maurer
36b80c25f7 Correctly return from selector loop one a scheduled task is ready for processing
Motivation:

We use the nanoTime of the scheduledTasks to calculate the milli-seconds to wait for a select operation to select something. Once these elapsed we check if there was something selected or some task is ready for processing. Unfortunally we not take into account scheduled tasks here so the selection loop will continue if only scheduled tasks are ready for processing. This will delay the execution of these tasks.

Modification:

- Check if a scheduled task is ready after selecting
- also make a tiny change in NioEventLoop to not trigger a rebuild if nothing was selected because the timeout was reached a few times in a row.

Result:

Execute scheduled tasks on time.
2014-07-02 09:10:37 +02:00
Norman Maurer
90c65b7157 [#2604] Not try to use sun.misc.Cleaner when on android
Motivation:

When a user tries to use netty on android it currently fails with "Could not find class 'sun.misc.Cleaner'"

Modification:

Encapsulate sun.misc.Cleaner usage in extra class to workaround this isssue.

Result:
Netty can be used on android again
2014-06-27 08:25:42 +02:00
Norman Maurer
8a75ba35ef [#2599] Not use sun.nio.ch.DirectBuffer as it not exists on android
Motivation:

During some refactoring we changed PlatformDependend0 to use sun.nio.ch.DirectBuffer for release direct buffers. This broke support for android as the class does not exist there and so an exception is thrown.

Modification:

Use again the fieldoffset to get access to Cleaner for release direct buffers.

Result:
Netty can be used on android again
2014-06-25 15:07:02 +02:00
Norman Maurer
030bcaae81 Improve performance of Recycler
Motivation:

Recycler is used in many places to reduce GC-pressure but is still not as fast as possible because of the internal datastructures used.

Modification:

 - Rewrite Recycler to use a WeakOrderQueue which makes minimal guaranteer about order and visibility for max performance.
 - Recycling of the same object multiple times without acquire it will fail.
 - Introduce a RecyclableMpscLinkedQueueNode which can be used for MpscLinkedQueueNodes that use Recycler

These changes are based on @belliottsmith 's work that was part of #2504.

Result:

Huge increase in performance.

4.0 branch without this commit:

Benchmark                                                (size)   Mode   Samples        Score  Score error    Units
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    00000  thrpt        20 116026994.130  2763381.305    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    00256  thrpt        20 110823170.627  3007221.464    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    01024  thrpt        20 118290272.413  7143962.304    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    04096  thrpt        20 120560396.523  6483323.228    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    16384  thrpt        20 114726607.428  2960013.108    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    65536  thrpt        20 119385917.899  3172913.684    ops/s
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 297.617 sec - in io.netty.microbench.internal.RecyclableArrayListBenchmark

4.0 branch with this commit:

Benchmark                                                (size)   Mode   Samples        Score  Score error    Units
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    00000  thrpt        20 204158855.315  5031432.145    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    00256  thrpt        20 205179685.861  1934137.841    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    01024  thrpt        20 209906801.437  8007811.254    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    04096  thrpt        20 214288320.053  6413126.689    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    16384  thrpt        20 215940902.649  7837706.133    ops/s
i.n.m.i.RecyclableArrayListBenchmark.recycleSameThread    65536  thrpt        20 211141994.206  5017868.542    ops/s
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 297.648 sec - in io.netty.microbench.internal.RecyclableArrayListBenchmark
2014-06-24 10:47:38 +02:00
Trustin Lee
cdaeb54fb9 Remove padding utility classes
- It's not used anywhere
2014-06-21 17:59:49 +09:00
Trustin Lee
f44720850c Add missing last padding / Comment 2014-06-21 17:57:06 +09:00
Trustin Lee
a368f9d12a Checkstyle / Overall clean-up / Fix serialization 2014-06-21 17:57:06 +09:00
nitsanw
32aab3b0b3 Fix false sharing between head and tail reference in MpscLinkedQueue
Motivation:

The tail node reference writes (by producer threads) are very likely to
invalidate the cache line holding the headRef which is read by the
consumer threads in order to access the padded reference to the head
node. This is because the resulting layout for the object is:

- header
- Object AtomicReference.value -> Tail node
- Object MpscLinkedQueue.headRef -> PaddedRef -> Head node

This is 'passive' false sharing where one thread reads and the other
writes.  The current implementation suffers from further passive false
sharing potential from any and all neighbours to the queue object as no
pre/post padding is provided for the class fields.

Modifications:

Fix the memory layout by adding pre-post padding for the head node and
putting the tail node reference in the same object.

Result:

Fixed false sharing
2014-06-21 17:57:06 +09:00
nmittler
02a6dc8ba7 Adding int-to-object map implementation.
Motivation:

Maps with integer keys are used in several places (HTTP/2 code, for
example). To reduce the memory footprint of these structures, we need a
specialized map class that uses ints as keys.

Modifications:

Added IntObjectHashMap, which is uses open addressing and double hashing
for collision resolution.

Result:

A new int-based map class that can be shared across Netty.
2014-06-21 08:37:59 +02:00
Trustin Lee
085a61a310 Refactor FastThreadLocal to simplify TLV management
Motivation:

When Netty runs in a managed environment such as web application server,
Netty needs to provide an explicit way to remove the thread-local
variables it created to prevent class loader leaks.

FastThreadLocal uses different execution paths for storing a
thread-local variable depending on the type of the current thread.
It increases the complexity of thread-local removal.

Modifications:

- Moved FastThreadLocal and FastThreadLocalThread out of the internal
  package so that a user can use it.
- FastThreadLocal now keeps track of all thread local variables it has
  initialized, and calling FastThreadLocal.removeAll() will remove all
  thread-local variables of the caller thread.
- Added FastThreadLocal.size() for diagnostics and tests
- Introduce InternalThreadLocalMap which is a mixture of hard-wired
  thread local variable fields and extensible indexed variables
- FastThreadLocal now uses InternalThreadLocalMap to implement a
  thread-local variable.
- Added ThreadDeathWatcher.unwatch() so that PooledByteBufAllocator
  tells it to stop watching when its thread-local cache has been freed
  by FastThreadLocal.removeAll().
- Added FastThreadLocalTest to ensure that removeAll() works
- Added microbenchmark for FastThreadLocal and JDK ThreadLocal
- Upgraded to JMH 0.9

Result:

- A user can remove all thread-local variables Netty created, as long as
  he or she did not exit from the current thread. (Note that there's no
  way to remove a thread-local variable from outside of the thread.)
- FastThreadLocal exposes more useful operations such as isSet() because
  we always implement a thread local variable via InternalThreadLocalMap
  instead of falling back to JDK ThreadLocal.
- FastThreadLocalBenchmark shows that this change improves the
  performance of FastThreadLocal even more.
2014-06-19 21:13:55 +09:00
Trustin Lee
4d60ea2aeb Fix incorrect method signature of awaitInactivity()
- Related: #2084
2014-06-17 16:00:54 +09:00
Trustin Lee
776ac4ba19 Use FastThreadLocal in more places 2014-06-14 17:46:10 +09:00
Trustin Lee
681d460938 Introduce TextHeaders and AsciiString
Motivation:

We have quite a bit of code duplication between HTTP/1, HTTP/2, SPDY,
and STOMP codec, because they all have a notion of 'headers', which is a
multimap of string names and values.

Modifications:

- Add TextHeaders and its default implementation
- Add AsciiString to replace HttpHeaderEntity
  - Borrowed some portion from Apache Harmony's java.lang.String.
- Reimplement HttpHeaders, SpdyHeaders, and StompHeaders using
  TextHeaders
- Add AsciiHeadersEncoder to reuse the encoding a TextHeaders
  - Used a dedicated encoder for HTTP headers for better performance
    though
- Remove shortcut methods in SpdyHeaders
- Replace SpdyHeaders.getStatus() with HttpResponseStatus.parseLine()

Result:

- Removed quite a bit of code duplication in the header implementations.
- Slightly better performance thanks to improved header validation and
  hash code calculation
2014-06-14 15:36:19 +09:00
belliottsmith
2a2a21ec59 Introduce FastThreadLocal which uses an EnumMap and a predefined fixed set of possible thread locals
Motivation:
Provide a faster ThreadLocal implementation

Modification:
Add a "FastThreadLocal" which uses an EnumMap and a predefined fixed set of possible thread locals (all of the static instances created by netty) that is around 10-20% faster than standard ThreadLocal in my benchmarks (and can be seen having an effect in the direct PooledByteBufAllocator benchmark that uses the DEFAULT ByteBufAllocator which uses this FastThreadLocal, as opposed to normal instantiations that do not, and in the new RecyclableArrayList benchmark);

Result:
Improved performance
2014-06-13 10:56:18 +02:00
Norman Maurer
3d81afb8a5 Make sure cancelled Timeouts are able to be GC'ed fast.
Motivation:
At the moment the HashedWheelTimer will only remove the cancelled Timeouts once the HashedWheelBucket is processed again. Until this the instance will not be able to be GC'ed as there are still strong referenced to it even if the user not reference it by himself/herself. This can cause to waste a lot of memory even if the Timeout was cancelled before.

Modification:
Add a new queue which holds CancelTasks that will be processed on each tick to remove cancelled Timeouts. Because all of this is done only by the WorkerThread there is no need for synchronization and only one extra object creation is needed when cancel() is executed. For addTimeout(...) no new overhead is introduced.

Result:
Less memory usage for cancelled Timeouts.
2014-06-10 12:47:37 +02:00
Norman Maurer
e3c76ec106 DNS codec for Netty which is based on the work of [#1622].
Motivation:
As part of GSOC 2013 we had @mbakkar working on a DNS codec but did not integrate it yet as it needs some cleanup. This commit is based on @mbakkar's work and provide the codec for DNS.

Modifications:
Add DNS codec

Result:
Reusable DNS codec will be included in netty.

This PR also includes a AsynchronousDnsResolver which allows to resolve DNS entries in a non blocking way by make use
of the dns codec and netty transport itself.
2014-06-10 09:57:06 +02:00
Trustin Lee
d1b90774bc Clean up MpscLinkedQueue, fix its leak, and make it work without Unsafe
Motivation:

MpscLinkedQueue has various issues:
- It does not work without sun.misc.Unsafe.
- Some field names are confusing.
  - Node.tail does not refer to the tail node really.
  - The tail node is the starting point of iteration. I think the tail
    node should be the head node and vice versa to reduce confusion.
- Some important methods are not implemented (e.g. iterator())
- Not serializable
- Potential false cache sharing problem due to lack of padding
- MpscLinkedQueue extends AtomicReference and thus exposes various
  operations that mutates the internal state of the queue directly.

Modifications:

- Use AtomicReferenceFieldUpdater wherever possible so that we do not
  use Unsafe directly. (e.g. use lazySet() instead of putOrderedObject)
- Extend AbstractQueue to implement most operations
- Implement serialization and iterator()
- Rename tail to head and head to tail to reduce confusion.
- Rename Node.tail to Node.next.
- Fix a leak where the references in the removed head are not cleared
  properly.
- Add Node.clearMaybe() method so that the value of the new head node
  is cleared if possible.
- Add some comments for my own educational purposes
- Add padding to the head node
  - Add FullyPaddedReference and RightPaddedReference for future reuse
- Make MpscLinkedQueue package-local so that a user cannot access the
  dangerous yet public operations exposed by the superclass.
  - MpscLinkedQueue.Node becomes MpscLinkedQueueNode, a top level class

Result:

- It's more like a drop-in replacement of ConcurrentLinkedQueue for the
  MPSC case.
- Works without sun.misc.Unsafe
- Code potentially easier to understand
- Fixed leak (related: #2372)
2014-06-04 03:23:55 +09:00
Trustin Lee
13c0cfde59 Add awaitInactivity() to GlobalEventExecutor and ThreadDeathWatcher
Motivation:

When running Netty on a container environment, the container will often
complain about the lingering threads such as the worker threads of
ThreadDeathWatcher and GlobalEventExecutor.  We should provide an
operation that allows a use to wait until such threads are terminated.

Modifications:

- Add awaitInactivity()
- (misc) Fix typo in GlobalEventExecutorTest
- (misc) Port ThreadDeathWatch's CAS-based thread life cycle management
  to GlobalEventExecutor

Result:

- Fixes #2084
- Less overhead on task submission of GlobalEventExecutor
2014-06-02 19:28:00 +09:00
Trustin Lee
e79ca269b8 Introduce ThreadDeathWatcher
Motivation:

PooledByteBufAllocator's thread local cache and
ReferenceCountUtil.releaseLater() are in need of a way to run an
arbitrary logic when a certain thread is terminated.

Modifications:

- Add ThreadDeathWatcher, which spawns a low-priority daemon thread
  that watches a list of threads periodically (every second) and
  invokes the specified tasks when the associated threads are not alive
  anymore
  - Start-stop logic based on CAS operation proposed by @tea-dragon
- Add debug-level log messages to see if ThreadDeathWatcher works

Result:

- Fixes #2519 because we don't use GlobalEventExecutor anymore
- Cleaner code
2014-06-02 18:23:23 +09:00
Norman Maurer
d0f3bfd4cc [#2523] Fix infinite-loop when remove attribute and create the same attribute again
Motivation:
The current DefaultAttributeMap cause an infinite-loop when the user removes an attribute and create the same attribute again. This regression was introduced by c3bd7a8ff1.

Modification:
Correctly break out loop

Result:
No infinite-loop anymore.
2014-06-01 13:10:52 +02:00
Trustin Lee
c7825f63c0 Fix a bug in DefaultPromise.notifyLateListener() where the listener is not notified
Motivation:

When (listeners == null && lateListeners == null) and (stackDepth >= MAX_LISTENER_STACK_DEPTH), the listener is not notified at all. The discard client does not work.

Modification:

Make sure to submit the notification task.

Result:

The discard client works again and all listeners are notified.
2014-05-23 09:48:05 +09:00
Trustin Lee
c4fc6b7043 Checkstyle 2014-05-20 17:39:14 +09:00