Motivation:
Some tests in PooledByteBufAllocatorTest are blocking on a CountDownLatch. We should use a timeout on these tests so these will not block forever on a failure.
Modifications:
Add timeout param to @Test annotation
Result:
Have sane timeouts on tests.
Motivation:
DefaultByteBufHolder.equals(...) and hashCode() should be implemented so it works correctly with instances that share the same content.
Modifications:
Add implementations and a unit-test.
Result:
Have correctly working equals(...) and hashCode() method
Motivation:
99dfc9ea79 introduced some code that will more frequently try to forward messages out of the list of decoded messages to reduce latency and memory footprint. Unfortunally this has the side-effect that RecycleableArrayList.clear() will be called more often and so introduce some overhead as ArrayList will null out the array on each call.
Modifications:
- Introduce a CodecOutputList which allows to not null out the array until we recycle it and also allows to access internal array with extra range checks.
- Add benchmark that add elements to different List implementations and clear them
Result:
Less overhead when decode / encode messages.
Benchmark (elements) Mode Cnt Score Error Units
CodecOutputListBenchmark.arrayList 1 thrpt 20 24853764.609 ± 161582.376 ops/s
CodecOutputListBenchmark.arrayList 4 thrpt 20 17310636.508 ± 930517.403 ops/s
CodecOutputListBenchmark.codecOutList 1 thrpt 20 26670751.661 ± 587812.655 ops/s
CodecOutputListBenchmark.codecOutList 4 thrpt 20 25166421.089 ± 166945.599 ops/s
CodecOutputListBenchmark.recyclableArrayList 1 thrpt 20 24565992.626 ± 210017.290 ops/s
CodecOutputListBenchmark.recyclableArrayList 4 thrpt 20 18477881.775 ± 157003.777 ops/s
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 246.748 sec - in io.netty.handler.codec.CodecOutputListBenchmark
Motivation:
DomainMappingBuilder should have been named as DomainNameMappingBuilder
because it builds a DomainNameMapping.
Modifications:
- Add DomainNameMappingBuilder that does the same job with
DomainMappingBuilder
- Deprecate DomainMappingBuilder and delegate its logic to
DomainNameMappingBuilder
- Remove the references to the deprecated methods and classes related
with domain name mapping
- Miscellaneous:
- Fix Javadoc of DomainNameMapping.asMap()
- Pre-create the unmodifiable map in DomainNameMapping
Result:
- Consistent naming
- Less use of deprecated API
Motivation:
DomainNameMapping.entries() returns Set<Map.Entry<String, V>>, which
doesn't sound very natural.
Modifications:
Replace entries() with asMap() which returns a Map<String, V> instead.
Result:
- Better looking API
- User can do a lookup because it's a Map
Motivation:
As reported in #4211, when using Netty in Tomcat (or other container based deployment), ForkJoinPool leaks an instance of `Submitter` so that the class loader of `Submitter` won't be GCed. However, since `Submitter` is just a wrapper of `int`, we can replace it with `int[1]`.
Modifications:
Replace `Submitter` with `int[1]`.
Result:
No class loader leak in ForkJoinPool when using in a container.
Motivation:
When a user has multiple EventLoops in an EventLoopGroup and calls pipeline.add* / remove* / replace from an EventLoop that belongs to another Channel it is possible to deadlock if the other EventLoop does the same.
Modification:
- Only ensure the actual modification takes place in a synchronized block and not wait until the handlerAdded(...) / handlerRemoved(...) method is called. This is ok as we submit the task to the executor while still holding the look and so ensure correct order of pipeline modifications.
- Ensure if an AbstractChannelHandlerContext is put in the linked-list structure but the handlerAdded(...) method was not called we skip it until handlerAdded(...) was called. This is needed to ensure handlerAdded(...) is always called first.
Result:
Its not possible to deadlock when modify the DefaultChannelPipeline.
Motivation:
See #4200.
Modifications:
Add DomainNameMapping.entries to allow retrieving the domain match lists.
Result:
People can use DomainNameMapping.entries to retrive the match list in DomainNameMapping.
Motivation:
If a task was submitted when wakenUp value was true, the task didn't get a chance to call Selector#wakeup.
So we need to check task queue again before executing select operation. If we don't, the task might be pended until select operation was timed out.
It might be pended until idle timeout if IdleStateHandler existed in pipeline.
Modifications:
Execute Selector#select in a non-blocking manner if there's a task submitted when wakenUp value was true.
Result:
Every tasks in NioEventLoop will not be pended.
Motivation:
If a task was submitted when wakenUp value was 1, the task didn't get a chance to produce wakeup event. So we need to check task queue again before calling epoll_wait. If we don't, the task might be pended until epoll_wait was timed out. It might be pended until idle timeout if IdleStateHandler existed in pipeline.
Modifications:
Execute epoll_wait in a non-blocking manner if there's a task submitted when wakenUp value was 1.
Result:
Every tasks in EpollEventLoop will not be pended.
Motivation:
To be more consistent we should use ConnectException when we fail the connect attempt because no LocalServerChannel exists with the given address.
Modifications:
Use correct exception.
Result:
More consistent handling of connection refused between different transports.
Motivation:
Sometimes it is useful to include more details in the IdleStateEvents that are produced by the IdleStateHandler. For this users should be able to create their own IdleStateEvents that encapsulate more informations.
Modifications:
- Make IdleStateEvent constructor protected and the class non-final
- Add protected method to IdleStateHandler that users can override and so create their own IdleStateEvents.
Result:
More flexible and customizable IdleStateEvents / IdleStateHandler
Motivation:
We should not try to call bind if registration failed.
Modifications:
Only call doBind0(...) when the registration not failed.
Result:
Not try to to bind if the registration failed.
Motivation:
PooledByteBufAllocatorTest.testNumThreadCachesWithNoDirrectArenas() had a race as it just used LockSupport.parkNanos(). We should better use a CountdownLatch and so be sure we really have init everything.
Modifications:
Replace LockSupport.parkNanos(...) with CountdownLatch usage
Result:
No more race in test.
Motivation:
When epoll datagram channel invokes sendmmsg0, _all_ of the messages go
on the wire with the address of the _last_ packet in the list.
Modifications:
An array of addresses equal to the length of the messages is allocated
on the stack to hold the address for each msg_hdr.msg_name.
Result:
Each message goes on the wire with the correct address.
Motivation:
The LateListener logic is prone to infinite loops and relies on being processed in the EventExecutor's thread for synchronization, but this EventExecutor may not be constant. An infinite loop can occur if the EventExecutor's execute method does not introduce a context switch in LateListener.run. The EventExecutor can be changed by classes which inherit from DefaultPromise. For example the DefaultChannelPromise will return w/e EventLoop the channel is registered to, but this EventLoop can change (re-registration).
Modifications:
- Remove the LateListener concept and instead use a single Object to maintain the listeners while still preserving notification order
- Make the result member variable an atomic variable so it can be outside the synchronized(this) blocks
- Cleanup/simplify existing state management code
Result:
Fixes https://github.com/netty/netty/issues/5185
Motivation:
Currently the default log level when running tests is debug. When
running the build on the CI server it might be nice to avoid this debug
level and allow for the level to be configured.
Modifications:
Added a logback-test.xml configuration that has been added to the
common module. This allows for the logLevel to be configured.
The default level will still be debug.
Result:
The log level can now be configured from the command line:
$ mvn test -DlogLevel=error
Motivation:
We should zero-out the private key as soon as possible when we not need it anymore.
Modifications:
zero out the private key before release the buffer.
Result:
Limit the time the private key resist in memory.
Motivation:
We called deallocationsHuge.decrement() but it needs to be increment()
Modifications:
Replace decrement() with increment()
Result:
Correct metrics.
Motivation:
NioDatagramChannelConfig currently uses NetworkChannel in its static { } block and so fails to init on android which not has this class.
Modifications:
Use reflection to load the NetworkChannel.class
Result:
Be able to use NIO Datagram on android as well.
Motivation:
At the moment we let the IllegalArgumentException escape when parsing form parameters. This is not expected.
Modifications:
Correctly catch IllegalArgumentException and rethrow as ErrorDataDecoderException.
Result:
Throw correct exception.
Motivation:
The current note reads as if this class is dangerous and advises the reader to "understand what this class does".
Modifications:
Rewrite the Javadoc note to describe what fingerprint checks are and what problems remain.
Result:
Clearer description which no longer causes the impression this class is dangerous.
Motivations
The test SniHandlerTest#testSniWithApnHandler() does not actually
involve SNI: given the client setup, the ClientHello in the form of hex
strings is not actually written to the wire, so the server never receives that.
We may need to write in somewhere else (e.g., channelActive()) instead of in
initChannel() in order for the hex strings to reach the server. So here
what's actually going on is an ordinary TLS C/S communication without SNI.
Modifications
The client part is modified to enable SNI by using an SslHandler with an
SSLEngine created by io.netty.handler.ssl.SslContext#newEngine(), where
the server hostname is specified. Also, more clauses are added to verify that
the SNI is indeed successful.
Results
Now the test verifies that both SNI and APN actually happen and succeed.
Motivation:
Checking if a key exists on a TreeMap has a Big O of "log 2 N",
doing it twice is not cheap.
Modifications:
Get the key instead which has the same cost and check if it is null.
Result:
Faster code due to one expensive operation removed.
Motivation:
If a channel is deregistered from an NioEventLoop the associated SelectionKey is cancelled. If the NioEventLoop has yet to process a pending event as a result of that SelectionKey then the NioEventLoop will see the SelecitonKey is invalid and close the channel. The NioEventLoop should not close a channel if it is not registered with that NioEventLoop.
Modifications:
- NioEventLoop.processSelectedKeys should check that the channel is still registered to itself before closing the channel
Result:
NioEventLoop doesn't close a channel that is no longer registered to it when the SelectionKey is invalid
Fixes https://github.com/netty/netty/issues/5125
Motivation:
NioEventLoopGroup supports constructors which take an executor but EpollEventLoopGroup does not. EPOLL should be consistent with NIO where ever possible.
Modifications:
- Add constructors to EpollEventLoopGroup which accept an Executor as a parameter
Result:
EpollEventLoopGroup is more consistent with NioEventLoopGroup
Fixes https://github.com/netty/netty/issues/5161
Motivation:
b112673554 added ChannelInputShutdownEvent support to ByteToMessageDecoder but missed updating the code for ReplayingDecoder. This has the effect:
- If a ChannelInputShutdownEvent is fired ByteToMessageDecoder (the super-class of ReplayingDecoder) will call the channelInputClosed(...) method which will pass the incorrect buffer to the decode method of ReplayingDecoder.
Modifications:
Share more code between ByteToMessageDEcoder and ReplayingDecoder and so also support ChannelInputShutdownEvent correctly in ReplayingDecoder
Result:
ChannelInputShutdownEvent is corrrectly handle in ReplayingDecoder as well.
Motivation:
We missed to reset the decoder when asked for it in HttpObjectDecoder and so sometimes could produce more then one LastHttpContent in a sequence during channelInactive.
This did show up as AssertionError:
22:22:35.499 [nioEventLoopGroup-3-1] WARN i.n.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
java.lang.AssertionError: null
at io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:205) ~[classes/:na]
at io.netty.handler.codec.http.HttpObjectAggregator.decode(HttpObjectAggregator.java:57) ~[classes/:na]
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89) ~[classes/:na]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292) [classes/:na]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:278) [classes/:na]
at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:428) [classes/:na]
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:277) [classes/:na]
at io.netty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:343) [classes/:na]
at io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:309) [classes/:na]
at io.netty.handler.codec.http.HttpClientCodec$Decoder.channelInactive(HttpClientCodec.java:228) [classes/:na]
at io.netty.channel.CombinedChannelDuplexHandler.channelInactive(CombinedChannelDuplexHandler.java:213) [classes/:na]
...
Modifications:
Correctly reset decoder.
Result:
Correctly only produce one LastHttpContent per sequence.
Motivation:
As we only provide tcnative jars for 64bit we should enforce 64bit when try to build netty, to make it easier for the user to understand why the build fails.
Modifications:
Add enforce rule.
Result:
Ensure 64bit is used when build netty.
We need to check if this handler was removed before continuing with decoding.
If it was removed, it is not safe to continue to operate on the buffer. This was already fixed for ByteToMessageDecoder in 4cdbe39284 but missed for ReplayingDecoder.
Modifications:
Check if decoder was removed after fire messages through the pipeline.
Result:
No illegal buffer access when decoder was removed.
Motivation:
When FixedCompositeByteBuf was constructed with new ByteBuf[0] and IndexOutOfboundsException was thrown.
Modifications:
Fix constructor
Result:
No more exception
Motivation:
Some ByteBuf implementations do not override all necessary methods,
which can lead to potentially sub-optimal behavior.
Also, SlicedByteBuf does not perform the range check correctly due to
missing overrides.
Modifications:
- Add missing overrides
- Use unwrap() instead of direct member access in derived buffers for
consistency
- Merge unwrap0() into unwrap() using covariant return type
- Deprecate AbstractDerivedByteBuf and its subtypes, because they were
not meant to be public
Result:
Correctness
Motivation:
Some applications may use alternative methods of loading the tcnative JNI symbols. We should support this use case.
Modifications:
Separate the loading and initialzation of the tcnative library so that each can fail independently.
Result:
Fixes#5043
Motivation:
Some applications may use alternative methods of loading the epoll JNI symbols. We should support this use case.
Modifications:
Attempt to use a side effect free JNI method. If that fails, load the library.
Result:
Fixes#5122
Motivation:
Revert 2e68e37025. Delaying the notification of writability change may lead to notification being missed. This is a ABA type of concurrency problem.
Modifications:
Revert 2e68e37025.
Result:
channelWritabilityChange will be called on every change, and will not be suppressed due to ABA scenario.
Motivation:
ByteBuf.readBytes(...) uses Unpooled.buffer(...) internally which will use a heap ByteBuf and also not able to make use of the allocator which may be pooled. We should better make use of the allocator.
Modifications:
Use the allocator for thenew buffer.
Result:
Take allocator into account when copy bytes.
Motiviation:
Sometimes it is useful to dump the status of the PooledByteBufAllocator and log it. Doing this is currently a bit cumbersome as the user needs to basically iterate through all the metrics and compose the String. we would better provide an easy way to do this.
Modification:
Add dumpStats() method.
Result:
Easier to get a view into the status of the allocator.
Motivation:
Sometimes a user only has access to a preconfigured SSLContext but still would like to use our ssl sub-system. For this situations it would be very useful if the user could create a JdkSslContext instance from an existing SSLContext.
Modifications:
- Create new public constructors in JdkSslContext which allow to wrap an existing SSLContext and make the class non-abstract
- Mark JdkSslServerContext and JdkSslClientContext as deprecated as the user should not directly use these.
Result:
It's now possible to create an JdkSslContext from an existing SSLContext.
Motivation:
We missed to correctly retrieve the localAddress() after we called Socket.connect(..) and so the user would always see an incorrect address when calling EpollSocketChannel.localAddress().
Modifications:
- Ensure we always retrieve the localAddress() after we called Socket.connect(...) as only after this we will be able to receive the correct address.
- Add unit test
Result:
Correct and consistent behaviour across different transports (NIO/OIO/EPOLL).
Motivation:
PoolChunkList.allocate(...) should return false without the need to walk all the contained PoolChunks when the requested capacity is larger then the capacity that can be allocated out of the PoolChunks in respect to the minUsage() and maxUsage() of the PoolChunkList.
Modifications:
Precompute the maximal capacity that can be allocated out of the PoolChunks that are contained in the PoolChunkList and use this to fast return from the allocate(...) method if an allocation capacity larger then that is requested.
Result:
Faster detection of allocations that can not be handled by the PoolChunkList and so faster allocations in general via the PoolArena.
Motivation:
To better understand how much memory is used by Netty for ByteBufs it is useful to understand how many bytes are currently active (allocated) per PoolArena.
Modifications:
- Add PoolArenaMetric.numActiveBytes()
Result:
The user is able to get better insight into the PooledByteBufAllocator.
