Commit Graph

6046 Commits

Author SHA1 Message Date
Norman Maurer
e26bbfd4a7 Use ByteBuf.readSlice(...).retain() to minimize memory copies.
Motivation:
At the moment we call ByteBuf.readBytes(...) in these handlers but with optimizations done as part of 25e0d9d we can just use readSlice(...).retain() and eliminate the memory copy.

Modifications:
Replace ByteBuf.readBytes(...) usage with readSlice(...).retain().

Result:
Less memory copies.
2014-05-10 16:05:50 +02:00
Norman Maurer
dd0782990b [#2485] Use RecvByteBufAllocator for all allocations related to read from Channel
Motivation:
At the moment we sometimes use only RecvByteBufAllocator.guess() to guess the next size and the use the ByteBufAllocator.* directly to allocate the buffer. We should always use RecvByteBufAllocator.allocate(...) all the time as this makes the behavior easier to adjust.

Modifications:
Change the read() implementations to make use of RecvByteBufAllocator.

Result:
Behavior is more consistent.
2014-05-10 15:28:02 +02:00
Trustin Lee
137080c595 Update netty-build to version 20
- Preparation for merging OpenSslEngine work
2014-05-08 10:00:38 +09:00
Daniel Bevenius
4a1d739e0f Adding short-curcuit option for CORS
Motivation:
CORS request are currently processed, and potentially failed, after the
target ChannelHandler(s) have been invoked. This might not be desired, for
example a HTTP PUT or POST might have been performed.

Modifications:
Added a shortCurcuit option to CorsConfig which when set will
cause a validation of the HTTP request's 'Origin' header and verify that
it is valid according to the configuration. If found invalid an 403
"Forbidden" response will be returned and not further processing will
take place.

This is indeed no help for non browser request, like using curl, which
can set the 'Origin' header.

Result:
Users can now configure if the 'Origin' header should be validated
upfront and have the request rejected before any further processing
takes place.
2014-05-06 12:16:09 +02:00
Norman Maurer
286e0c7e87 Fix buffer leak introduced by #2462
Motivation:
Because of not correctly release a buffer before null out the reference a memory leak shows up.

Modifications:
Correct call buffer.release() before null out reference.

Result:
No more leak
2014-05-06 10:06:07 +02:00
Jeff Pinner
df9a26583b SPDY: ensure SpdyHeaderBlockRawDecoder always reads entire input 2014-05-05 07:32:54 +02:00
Jeff Pinner
fb87e2906a SPDY: release headerBlock in SpdyFrameCodec 2014-05-05 07:02:54 +02:00
Jeff Pinner
9f8e591cac SPDY: remove unused code in SpdyHeaderBlockRawEncoder 2014-05-05 07:01:47 +02:00
Sun Ning
8d2116c34b Made websocket maxFramePayloadSize configurable from WebSocketServerProtocolHandler.
Motivation:

Currently there's no way to configure maxFramePayloadSize from
WebSocketServerProtocolHandler, which is the most used entry point of
WebSocket server.

Modifications:

Added another constructor for maxFramePayloadSize.

Result:

We can configure max frame size for websocket packet in
WebSocketServerProtocolHandler. It will also keep backward compatibility
with default max size: 65536. (65536 is hard-coded max size in previous
version of Netty)
2014-05-05 06:23:44 +02:00
Norman Maurer
d4f074186d [#2454] Correctly return null when DefaultChannelPipeline.firstContext() is called on empty pipeline
Motivation:
DefaultChannelPipeline.firstContext() should return null when the ipeline is empty. This is not the case atm.

Modification:
Fix incorrect check in DefaultChannelPipeline.firstContext() and add unit tests.

Result:
Correctly return null when DefaultChannelPipeline.firstContext() is called on empty pipeline.
2014-05-04 21:09:58 +02:00
Jeff Pinner
c93c6f01bd SPDY: allow subclassing of SpdyFrameCodec 2014-05-03 14:41:28 +02:00
Trustin Lee
a74c6b4692 Generate the default JAR to make oss.sonatype.org happy
Motivation:

oss.sonatype.org refuses to promote an artifact if it doesn't have the
default JAR (the JAR without classifier.)

Modifications:

- Generate both the default JAR and the native JAR to make
  oss.sonatype.org happy
- Rename the profile 'release' to 'restricted-release' which reflects
  what it really does better
- Remove the redundant <quickbuild>true</quickbuild> in all/pom.xml
  We specify the profile 'full' that triggers that property already
  in maven-release-plugin configuration.

Result:

oss.sonatype.org is happy.  Simpler pom.xml
2014-05-03 17:33:04 +09:00
Trustin Lee
550577d4da Enforce the release is performed only from RHEL 6.5 or equivalent
Motivation:

Netty must be released from RHEL 6.5 x86_64 or compatible so that:

1) we ship x86_64 version of epoll transport officially, and
2) we ensure the ABI compatibility with older GLIBC versions.
   The shared library built on a distribution with newer GLIBC will not
   run on older distributions.

Modifications:

- When 'release' profile is active, perform an additional check using
  maven-enforcer-plugin so that 'mvn release:*' fails when running on
  non-RHEL6.5.  This rule is active only when releasing, so a user
  should not be affected.
- Simplify maven-release-plugin configuration by removing redundant
  profiles such as 'linux'.  'linux' is automatically activated when
  releasing because we now enforce the release occurs on linux-x86_64.
- Remove the no-osgi profile, which is unused
- Remove the reference to 'sonatype-oss-release' profile in all/pom.xml,
  because we always specify 'release' profile when releasing
- Rename the profile 'linux-native' to 'linux' for brevity
- Upgrade oss-parent and maven-enforcer-plugin

Result:

No one can make a mistake to release Netty on an environment that can
produce incompatible or missing native library.
2014-05-02 21:20:47 +09:00
Trustin Lee
da9bf36199 Upgrade os-maven-plugin to fix a build issue on windows-x86_32 2014-05-02 21:15:40 +09:00
Trustin Lee
b611e57205 Fix a build failure due to missing classifier 2014-05-02 14:36:16 +09:00
Trustin Lee
568295d6c0 Simplify native library resolution using os-maven-plugin
Motivation:

So far, we used a very simple platform string such as linux64 and
linux32.  However, this is far from perfection because it does not
include anything about the CPU architecture.

Also, the current build tries to put multiple versions of .so files into
a single JAR.  This doesn't work very well when we have to ship for many
different platforms.  Think about shipping .so/.dynlib files for both
Linux and Mac OS X.

Modification:

- Use os-maven-plugin as an extension to determine the current OS and
  CPU architecture reliable at build time
- Use Maven classifier instead of trying to put all shared libraries
  into a single JAR
- NativeLibraryLoader does not guess the OS and bit mode anymore and it
  always looks for the same location regardless of platform, because the
  Maven classifier does the job instead.

Result:

Better scalable native library deployment and retrieval
2014-05-02 04:22:11 +09:00
Norman Maurer
a597087a9f [maven-release-plugin] prepare for next development iteration 2014-04-30 15:40:54 +02:00
Norman Maurer
b562148e2d [maven-release-plugin] prepare release netty-4.0.19.Final 2014-04-30 15:40:31 +02:00
Norman Maurer
787a85f9f1 Remove ContinuationWebSocketFrame.aggregatedText()
Motivation:
Before we aggregated the full text in the WebSocket08FrameDecoder just to fill in the ContinuationWebSocketFrame.aggregatedText(). The problem was that there was no upper-limit and so it would be possible to see an OOME if the remote peer sends a TextWebSocketFrame + a never ending stream of ContinuationWebSocketFrames. Furthermore the aggregation does not really belong in the WebSocket08FrameDecoder, as we provide an extra ChannelHandler for this anyway (WebSocketFrameAggregator).

Modification:
Remove the ContinuationWebSocketFrame.aggregatedText() method and corresponding constructor. Also refactored WebSocket08FrameDecoder a bit to me more efficient which is now possible as we not need to aggregate here.

Result:
No more risk of OOME because of frames.
2014-04-30 14:40:52 +02:00
Norman Maurer
76355a28b0 Correctly write pending data after ssl handshake completes. Related to [#2437]
Motivation:
When writing data from a server before the ssl handshake completes may not be written at all to the remote peer
if nothing else is written after the handshake was done.

Modification:
Correctly try to write pending data after the handshake was complete

Result:
Correctly write out all pending data
2014-04-30 14:23:03 +02:00
Norman Maurer
82220b0987 Correctly handle SocksCmdResponse. Related to #2428
Motivation:
Ports range check is not correct

Modification:
Allow port between 0 and 65535. 0 is wildcard / unknown port here

Result:
Correct validation
2014-04-30 10:42:46 +02:00
Norman Maurer
e6783d173a [#2428] Proper fix of incorrect port range check
Motivation:

In the Internet Protocol, the valid port number range is from 1 to 65535
(inclusive on the both side.)  However, SocksCmdRequest and SocksCmdResponse
refuses to construct itself when the port number 65535 is specified. Beside
this it excepts 0 as port number which should not allowed.

    Modification:

* Not raise an exception when the specified port number is 65535.
* Raise an exception when the specified port number is 0

Result:

Fixes #2428
2014-04-30 08:16:43 +02:00
Trustin Lee
4d271ddefe Fix incorrect port range check
Motivation:

In the Internet Protocol, the valid port number range is from 1 to 65535
(inclusive on the both side.)  However, SocksCmdRequest refuses to
construct itself when the port number 65535 is specified.

Modification:

Do not raise an exception when the specified port number is 65535.

Result:

Fixes #2428
2014-04-29 17:58:27 +09:00
Norman Maurer
bf5c928796 Not cause busy loop when interrupt Thread of NioEventLoop
Motivation:
Because Thread.currentThread().interrupt() will unblock Selector.select() we need to take special care when check if we need to rebuild the Selector. If the unblock was caused by the interrupt() we will clear it and move on as this is most likely a bug in a custom ChannelHandler or a library the user makes use of.

Modification:
Clear the interrupt state of the Thread if the Selector was unblock because of an interrupt and the returned keys was 0.

Result:
No more busy loop caused by Thread.currentThread().interrupt()
2014-04-28 08:05:46 +02:00
Daniel Bevenius
3f03612241 Adding support for echoing the request origin for CORS.
Motivation:
When CORS has been configured to allow "*" origin, and at the same time
is allowing credentials/cookies, this causes an error from the browser
because when the response 'Access-Control-Allow-Credentials' header
is true, the 'Access-Control-Allow-Origin' must be an actual origin.

Modifications:
Changed CorsHandler setOrigin method to check for the combination of "*"
origin and allowCredentials, and if the check matches echo the CORS
request's 'Origin' value.

Result:
This addition enables the echoing of the request 'Origin' value as the
'Access-Control-Allow-Origin' value when the server has been configured
to allow any origin in combination with allowCredentials.

This allows client requests to succeed when expecting the server to
be able to handle "*" origin and at the same time be able to send cookies
by setting 'xhr.withCredentials=true'. A concrete example of this is
the SockJS protocol which expects behaviour.
2014-04-25 18:15:51 +02:00
Trustin Lee
b4bc47e280 Code clean-up
Motivation:

It is less confusing not to spread Thread.interrupt() calls.

Modification:

- Comments
- Move generatorThread.interrupt() to where currentThread.interrupt() is
  triggered

Result:

Code that is easier to read
2014-04-25 17:44:15 +09:00
Trustin Lee
bdab831ba5 Undeprecate deregister() and chanelUnregistered()
Motivation:

As discussed in #2250, it will become much less complicated to implement
deregistration and reregistration of a channel once #2250 is resolved.
Therefore, there's no need to deprecate deregister() and
channelUnregistered().

Modification:

- Undeprecate deregister() and channelUnregistered()
- Remove SuppressWarnings annotations where applicable

Result:

We (including @jakobbuchgraber) are now ready to play with #2250 at
master
2014-04-25 16:53:59 +09:00
Jens Reimann
75e1b3e799 Mark sun.nio.ch as optional
Motivation:

If sun.nio.ch is not optional this will cause troubles in the
OSGi world. The package is not exposed by default in OSGi, so
actually the whole netty framework cannot be used directly.

There are workarounds, but workarounds are ugly. Especially since
the use of sun.nio.ch is optional. So the requirement on the
package should be optional as well.

Modifications:

Make the import of sun.nio.ch optional.

Result:

If the package cannot be imported it will behave as if the package
sun.nio.ch is not present (like with other JVMs). If the package is
exposed in OSGi (e.g. bootclassloader delegation, extension fragment)
it will be used.
2014-04-23 10:34:45 +02:00
Norman Maurer
c9faaa6e3e Make NioSocketChannelTest more bullet-proof
Motivation:
I had the NioSocketChannelTest.testFlushCloseReentrance() fail sometimes on one of my linux installation. This change let it pass all the time.

Modification:
Set the SO_SNDBUF to a small value to force split writes

Result:
Test is passing all the time where it was sometimes fail before.
2014-04-23 09:26:09 +02:00
Norman Maurer
ee55d34cfe [#2414] Fix IllegalStateException when try to configure AbstractEpollChannel once it is deregistered
Motivation:
AbstractEpollChannel.clearEpollIn() throws an IllegalStateException if a user tries to change the autoRead configuration for the Channel and the Channel is not registered on an EventLoop yet. This makes it for example impossible to set AUTO_READ to false via the ServerBootstrap as the configuration is modifed before the Channel is registered.

Modification:
Check if the Channel is registered and if not just modify the flags directly so they are respected once the Channel is registered

Result:
It is possible now to configure AUTO_READ via the ServerBootstrap
2014-04-22 10:14:31 +02:00
Norman Maurer
12ac35cd57 [#2414] Fix RuntimeException during modify events via EpollEventLoop
Motivation:
We are currently try to modify the events via EpollEventLoop even when the channel was closed before and so the fd was set to -1. This fails with a RuntimeException in this case.

Modification:
Always check if the Channel is still open before try to modify the events.

Result:
No more RuntimeException because of a not open channel
2014-04-21 11:16:07 +02:00
Norman Maurer
579ef0c4c0 [#2400] Not close LocalChannel during deregister() to allow register to other EventLoop
Motivation:
At the moment it is not possible to deregister a LocalChannel from its EventLoop and register it to another one as the LocalChannel is closed during the deregister.

Modification:
Not close the LocalChannel during dergister

Result:
It is now possible to deregister a LocalChannel and register it to another EventLoop
2014-04-21 10:07:14 +02:00
Norman Maurer
302d116728 Use correct generics for TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT in EpollChannelOption. Part of [#2396]
Motivation:
Currently the generics used for TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT are incorrect.

Modifications:
Use Integer as type

Result:
User can use TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT as expected
2014-04-21 09:56:57 +02:00
Trustin Lee
8e314cdbca Stop ThreadLocalRandom's initial seed generation immediately on interruption
Motivation:

ThreadLocalRandomTest reveals that ThreadLocalRandom's initial seed generation loop becomes tight if the thread is interrupted.
We currently interrupt ourselves inside the wait loop, which will raise an InterruptedException again in the next iteration, resulting in infinite (up to 3 seconds) exception construction and thread interruptions.

Modification:

- When the initial seed generator thread is interrupted, break out of the wait loop immediately.
- Log properly when the initial seed generation failed due to interruption.
- When failed to generate the initial seed, interrupt the generator thread just in case the SecureRandom implementation handles it properly.
- Make the initial seed generator thread daemon and handle potential exceptions raised due to the interruption.

Result:

No more tight loop on interruption.  More robust generator thread termination. Fixes #2412
2014-04-20 17:54:57 +09:00
Trustin Lee
f175ce0653 Feed only a single SSL record to SSLEngine.unwrap()
Motivation:

Some SSLEngine implementations violate the contract and raises an
exception when SslHandler feeds an input buffer that contains multiple
SSL records to SSLEngine.unwrap(), while the expected behavior is to
decode the first record and return.

Modification:

- Modify SslHandler.decode() to keep the lengths of each record and feed
  SSLEngine.unwrap() record by record to work around the forementioned
  issue.
- Rename unwrap() to unwrapMultiple() and unwrapNonApp()
- Rename unwrap0() to unwrapSingle()

Result:

SslHandler now works OpenSSLEngine from finagle-native.  Performance
impact remains unnoticeable.  Slightly better readability. Fixes #2116.
2014-04-20 17:33:36 +09:00
Martin Krüger
643f3d687b Fix chunk type for stream identifier
Motivation:
The problem with the current snappy implementation is that it does
not comply with framing format definition found on
https://code.google.com/p/snappy/source/browse/trunk/framing_format.txt

The document describes that chunk type of the stream identifier is defined
as 0xff. The current implentation uses 0x80.

Modifications:
This patch replaces the first byte of the chunk type of the stream identifier
with 0xff.

Result:
After this modification the snappy implementation is compliant to the
framing format described at
https://code.google.com/p/snappy/source/browse/trunk/framing_format.txt.
This results in a better compatibility with other implementations.
2014-04-19 21:02:34 +02:00
Norman Maurer
886829d7e0 Fix buffer leak in EpollDatagramChannel
Motivation:
EpollDatagramChannel produced buffer leaks when tried to read from the channel and nothing was ready to be read.

Modifications:
Correctly release buffer if nothing was read

Result:
No buffer leak
2014-04-18 20:34:37 +02:00
Norman Maurer
b13953fd45 [#2396] Allow to set TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT in native transport
Motivation:
Allow to set TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT in native transport to offer the user with more flexibility.

Modifications:
Expose methods to set these options and write the JNI implementation.

Result:
User can now use TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT.
2014-04-18 11:27:58 +02:00
Trustin Lee
8008530498 Work around an Android SSLEngine issue
Motivation:

Some Android SSLEngine implementations skip FINISHED handshake status
and go straightly into NOT_HANDSHAKING.  This behavior blocks SslHandler
from notifying its handshakeFuture, because we do the notification when
SSLEngine enters the FINISHED state.

Modification:

When the current handshake state is NOT_HANDSHAKING and the
handshakeFuture is not fulfilled yet, treat NOT_HANDSHAKING as FINISHED.

Result:

Better Android compatibility - fixes #1823
2014-04-18 18:01:40 +09:00
Norman Maurer
5551403b2a [#2401] Improve documentation of HttpObjectAggregator
Motivation:
Make it more clear what the output of HttpObjectAggregator is and that it need to come after the encoder in the pipeline.

Modifications:
Change javadocs to make things more clear.

Result:
Better docs
2014-04-17 15:44:53 +02:00
Norman Maurer
c97c8b7b8e [#2144] Fix NPE in Local transport caused by a race
Motivation:
At the moment it is possible to see a NPE when the LocalSocketChannels doRegister() method is called and the LocalSocketChannels doClose() method is called before the registration was completed.

Modifications:
Make sure we delay the actual close until the registration task was executed.

Result:
No more NPE
2014-04-17 14:24:36 +02:00
Norman Maurer
f5d4e6b10e [#2405] Add support for SO_REUSEPORT to EpollDatagramChannel
Motivation:
With SO_REUSEPORT it is possible to bind multiple sockets to the same port and so handle the processing of packets via multiple threads. This allows to handle DatagramPackets with more then one thread on the same port and so gives better performance.

Modifications:
Expose EpollDatagramChannelConfig.setReusePort(..) and isReusePort()

Result:
Allow to bind multiple times to the same local address and so archive better performance.
2014-04-17 11:19:00 +02:00
Norman Maurer
c2dc993c42 [#2375] [#2404] Fix bug in respecting ChannelConfig.setAutoRead(false) and also fix Channel.read() for OIO
Motivation:
At the moment ChanneConfig.setAutoRead(false) only is guaranteer to not have an extra channelRead(...) triggered when used from within the channelRead(...) or channelReadComplete(...) method. This is not the correct behaviour as it should also work from other methods that are triggered from within the EventLoop. For example a valid use case is to have it called from within a ChannelFutureListener, which currently not work as expected.

Beside this there is another bug which is kind of related. Currently Channel.read() will not work as expected for OIO as we will stop try to read even if nothing could be read there after one read operation on the socket (when the SO_TIMEOUT kicks in).

Modifications:
Implement the logic the right way for the NIO/OIO/SCTP and native transport, specific to the transport implementation. Also correctly handle Channel.read() for OIO transport by trigger a new read if SO_TIMEOUT was catched.

Result:
It is now also possible to use ChannelConfig.setAutoRead(false) from other methods that are called from within the EventLoop and have direct effect.
2014-04-17 07:37:34 +02:00
Norman Maurer
72a077b6c7 [#2377] Implement epoll based DatagramChannel
Motivation:
There is currently no epoll based DatagramChannel. We should add one to make the set of provided channels complete and also to be able to offer better performance compared to the NioDatagramChannel once SO_REUSEPORT is implemented.

Modifications:
Add implementation of DatagramChannel which uses epoll. This implementation does currently not support multicast yet which will me implemented later on. As most users will not use multicast anyway I think it is fair to just add the EpollDatagramChannel without the support for now. We shipped NioDatagramChannel without support earlier too ...

Result:
Be able to use EpollDatagramChannel for max. performance on linux
2014-04-16 15:28:04 +02:00
Norman Maurer
02c3e71012 [#2376] Add support for SO_REUSEPORT in native transport
Motivation:
In linux kernel 3.9 a new featured named SO_REUSEPORT was introduced which allows to have multiple sockets bind to the same port and so handle the accept() of new connections with multiple threads. This can greatly improve the performance when you not to accept a lot of connections.

Modifications:
Implement SO_REUSEPORT via JNI

Result:
Be able to use the SO_REUSEPORT feature when using the EpollServerSocketChannel
2014-04-16 14:25:02 +02:00
Norman Maurer
a4ea35b875 Fix missed buffer leaks in SpdyFrameDecoderTest
Motivation:
 Fix leaks reported during running SpdyFrameDecoderTest

Modifications:
Make sure the produced buffers of SpdyFrameDecoder and SpdyFrameDecoderTest are released

Result:

No more leak reports during run the tests.
2014-04-16 14:03:12 +02:00
Norman Maurer
017e156821 Fix buffer leaks in SpdyFrameDecoderTest
Motivation:

Fix leaks reported during running SpdyFrameDecoderTest

Modifications:
Make sure the produced buffer of SpdyFrameDecoder is released

Result:

No more leak reports during run the tests.
2014-04-16 10:45:45 +02:00
Norman Maurer
b5b8c2c3dd Fix buffer leaks in SPDY test
Motivation:

Fix leaks reported during SPDY test.

Modifications:

Use ReferenceCountUtil.releaseLater(...) to make sure everything is released once the tests are done.

Result:

No more leak reports during run the tests.
2014-04-16 06:51:37 +02:00
Jeff Pinner
2360142b89 SPDY: refactor frame codec implementation
Motivation:

Currently, the SPDY frame encoding and decoding code is based upon
the ChannelHandler abstraction. This requires maintaining multiple
versions for 3.x and 4.x (and possibly 5.x moving forward).

Modifications:

The SPDY frame encoding and decoding code is separated from the
ChannelHandler and SpdyFrame abstractions. Also test coverage is
improved.

Result:

SpdyFrameCodec now implements the ChannelHandler abstraction and is
responsible for creating and handling SpdyFrame objects.

Conflicts:
	codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyFrameCodec.java
2014-04-15 20:05:05 +02:00
ian
fde13d96f9 Fix error that causes (up to) double memory usage
Motivation:

PoolArena's 'normalizeCapacity' function was micro-optimized some
time ago to remove a while loop. However, there was a change of
behavior in the function as a result. Capacities passed into it
that are already powers of 2 (and >= 512) are doubled in size. So
if I ask for a buffer with a capacity of 1024, I will get back one
that actually uses 2048 bytes (stored in maxLength).

Aligning to powers of two for book keeping ease is reasonable,
and if someone tries to expand a buffer, you might as well use some
of the previously wasted space. However, since this distinction
between 'easily expanded' and 'costly to expand' space is not
supported at all by the APIs, I cannot imagine this change to
doubling is desirable or intentional.

This is especially costly when using composite buffers. They
frequently allocate components with a capacity that is a power of
2, and they never attempt to expand components themselves. The end
result is that heavy use of pool-backed composite buffers wastes
almost half of the memory pool (the smaller / initial components are
<512 and so are not affected by the off-by-one bug).

Modifications:

Although I find it difficult to believe that such an optimization
is really helpful, I left it in and fixed the off-by-one issue by
decrementing the value at the start.

I also added a simple test to both attempt to verify that the
decrement fixes the issue without introducing any other change, and
to make it easy for a reviewer to test the existing behavior. PoolArena
does not seem to have much testing or testability support though so
the test is kind of a hack and will break for unrelated changes. I
suggest either removing it or factoring out the single non-static
portion of normalizeCapacity so that the fragile dummy PoolArena is
not required.

Result:

Pooled allocators will allocate less resources to the highly
inefficient and undocumented buffer section between length and
maxLength.

Composite buffers of non-trivial size that are backed by pooled
allocators will use about half as much memory.
2014-04-15 07:02:49 +02:00