Commit Graph

502 Commits

Author SHA1 Message Date
Trustin Lee
5f9090a7f0 Fix invalid memory access in AIO writes
To perform writes in AioSocketChannel, we get a ByteBuffer view of the
outbound buffer and specify it as a parameter when we call
AsynchronousSocketChannel.write().

In most cases, the write() operation is finished immediately.  However,
sometimes, it is scheduled for later execution.  In such a case, there's
a chance for a user's handler to append more data to the outbound
buffer.

When more data is appended to the outbound buffer, the outbound buffer
can expand its capacity by itself.  Changing the capacity of a buffer is
basically made of the following steps:

1. Allocate a larger new internal memory region.
2. Copy the current content of the buffer to the new memory region.
3. Rewire the buffer so that it refers to the new region.
4. Deallocate the old memory region.

Because the old memory region is deallocated at the step 4, the write
operation scheduled later will access the deallocated region, leading
all sort of data corruption or even segfaults.

To prevent this situation, I added suspendIntermediaryDeallocations()
and resumeIntermediaryDeallocations() to UnsafeByteBuf.

AioSocketChannel.doFlushByteBuf() now calls suspendIntermediaryDealloc()
to defer the deallocation of the old memory regions until the completion
handler is notified.
2012-12-02 21:50:33 +09:00
Trustin Lee
72e0acbe84 Use correct timeout in AioSocketChannel.beginRead() 2012-12-02 20:38:59 +09:00
Trustin Lee
bfe2a96505 Fix AssertionError from AsyncSocketChannel.beginRead()
An AssertionError is triggered by a ByteBuf when beginRead() attempts to
access the buffer which has been freed already.  This commit ensures the
buffer is not freed before performing an I/O operation.

To determine if the buffer has been freed, UnsafeByteBuf.isFreed() has
been added.
2012-12-02 20:17:53 +09:00
Trustin Lee
95e8ec1db9 Handle the case where JDK notifies aync I/O handler immediately
After some debugging, I found that JDK AIO implementation often performs
I/O immediately from the caller thread if the caller thread is the I/O
thread, and notifies the completion handler also immediately.  This
commit handles such a case correctly during reads and writes.

Additionally, this commit also changes SingleThreadEventExecutor to let
it handle unexpected exceptions such as AssertionError in a robus
manner.
2012-12-02 20:03:35 +09:00
Trustin Lee
818a7b42a3 Fix all Xlint:unchecked warnings 2012-11-30 22:49:51 +09:00
Trustin Lee
c661c344ed Add proper toString() implementation for internal ChannelFactory impls 2012-11-26 17:15:14 +09:00
Trustin Lee
918666481e Ensure lazily instantiated outbound buffers are instantiated from the event loop 2012-11-26 17:14:21 +09:00
Trustin Lee
74749ec15d Implement Bootstrap.toString() and use it in the testsuite
By implementing Bootstrap.toString() and printing it for each test case helps us figure out which transport is causing a trouble.
2012-11-26 16:14:24 +09:00
Trustin Lee
dbbc6ad73f Reduce the chance of RejectedExecutionException
When a Netty application shuts down, a user often sees a REE
(RejectedExecutionException).

A REE is raised due to various reasons we don't have control over, such
as:

- A client connects to a server while the server is shutting down.

- An event is triggered for a closed Channel while its event loop is
  also shutting down.  Some of them are:
  - channelDeregistered (triggered after a channel is closed)
  - freeIn/OutboundBuffer (triggered after channelDeregistered)
  - userEventTriggered (triggered anytime)

To address this issue, a new method called confirmShutdown() has been
added to SingleThreadEventExecutor.  After a user calls shutdown(),
confirmShutdown() runs any remaining tasks in the task queue and ensures
no events are triggered for last 2 seconds.  If any task are added to
the task queue before 2 seconds passes, confirmShutdown() prevents the
event loop from terminating by returning false.

Now that SingleThreadEventExecutor needs to accept tasks even after
shutdown(), its execute() method only rejects the task after the event
loop is terminated (i.e. isTerminated() returns true.)  Except that,
there's no change in semantics.

SingleThreadEventExecutor also checks if its subclass called
confirmShutdown() in its run() implementation, so that Netty developers
can make sure they shut down their event loop impementation correctly.

It also fixes a bug in AioSocketChannel, revealed by delayed shutdown,
where an inboundBufferUpdated() event is triggered on a closed Channel
with deallocated buffers.

Caveats:

Because SingleThreadEventExecutor.takeTask() does not have a notion of
timeout, confirmShutdown() adds a dummy task (WAKEUP_TASK) to wake up
takeTask() immediately and instead sleeps hard-coded 100ms.  I'll
address this issue later by modifying takeTask() times out dynamically.

Miscellaneous changes:

SingleThreadEventExecutor.wakeup() now has the default implementation.
Instead of interrupting the current thread, it simply adds a dummy task
(WAKEUP_TASK) to the task queue, which is more elegant and efficient.
NioEventLoop is the only implementation that overrides it. All other
implementations' wakeup()s were removed thanks to this change.
2012-11-22 20:36:13 +01:00
Trustin Lee
81e2db10fa ByteBufAllocator API w/ ByteBuf perf improvements
This commit introduces a new API for ByteBuf allocation which fixes
issue #643 along with refactoring of ByteBuf for simplicity and better
performance. (see #62)

A user can configure the ByteBufAllocator of a Channel via
ChannelOption.ALLOCATOR or ChannelConfig.get/setAllocator().  The
default allocator is currently UnpooledByteBufAllocator.HEAP_BY_DEFAULT.

To allocate a buffer, do not use Unpooled anymore. do the following:

  ctx.alloc().buffer(...); // allocator chooses the buffer type.
  ctx.alloc().heapBuffer(...);
  ctx.alloc().directBuffer(...);

To deallocate a buffer, use the unsafe free() operation:

  ((UnsafeByteBuf) buf).free();

The following is the list of the relevant changes:

- Add ChannelInboundHandler.freeInboundBuffer() and
  ChannelOutboundHandler.freeOutboundBuffer() to let a user free the
  buffer he or she allocated. ChannelHandler adapter classes implement
  is already, so most users won't need to call free() by themselves.
  freeIn/OutboundBuffer() methods are invoked when a Channel is closed
  and deregistered.

- All ByteBuf by contract must implement UnsafeByteBuf. To access an
  unsafe operation: ((UnsafeByteBuf) buf).internalNioBuffer()

- Replace WrappedByteBuf and ByteBuf.Unsafe with UnsafeByteBuf to
  simplify overall class hierarchy and to avoid unnecesary instantiation
  of Unsafe instances on an unsafe operation.

- Remove buffer reference counting which is confusing

- Instantiate SwappedByteBuf lazily to avoid instantiation cost

- Rename ChannelFutureFactory to ChannelPropertyAccess and move common
  methods between Channel and ChannelHandlerContext there. Also made it
  package-private to hide it from a user.

- Remove unused unsafe operations such as newBuffer()

- Add DetectionUtil.canFreeDirectBuffer() so that an allocator decides
  which buffer type to use safely
2012-11-22 15:10:59 +09:00
Mike Heath
40e53b9b68 Fixed exception handling to call the exceptionCaught method in the current handler. By default the handler will call ctx.fireExceptionCaught which is what was happening before. 2012-11-20 10:00:27 +01:00
coltnz
fea7475080 [#749] Report non @Shareable handler name that has been re-added. 2012-11-18 11:40:01 +01:00
Evans Yang
a0da613e86 [#743] Make the "tail" point to the last channel handler context. And add several cases for DefaultChannelPipeline. 2012-11-16 07:33:32 +01:00
Evans Yang
37d04c26a8 [#739] Potential NullPointException without checking the initialCtx's status 2012-11-16 07:08:45 +01:00
Shawn Silverman
0bd73b8d80 [#732] [#672] Allow replacing an inbound or outbound buffer of a handler 2012-11-13 21:17:42 +01:00
Norman Maurer
d177fd5a17 [#735] Make sure the handshake ChannelFuture is notified after the right encoder is present in the ChannelPipeline 2012-11-13 09:25:19 +01:00
Trustin Lee
45de76f58d More helpful IllegalArgumentException message 2012-11-12 16:02:30 +09:00
Trustin Lee
b3be15204d Fix 'channelFactory already set' error 2012-11-12 15:59:25 +09:00
Trustin Lee
a05064d3eb Fix more inspection warnings + compilation errors 2012-11-12 13:25:00 +09:00
Trustin Lee
aedf8790c3 Fix various Javadoc issues / Do not use argN parameter names 2012-11-12 12:26:19 +09:00
Trustin Lee
ea4a0e3535 Prefer {@code ...} to <code>...</code> / Fix deprecation warnings 2012-11-12 11:51:23 +09:00
Trustin Lee
15642f2cd8 Do not call static methods via instances 2012-11-12 11:23:06 +09:00
Trustin Lee
d78f5a4f76 Optimize imports / Remove britspace 2012-11-12 09:51:59 +09:00
Trustin Lee
4dce19b814 Replace a variable with a constant wherever possible 2012-11-12 09:43:14 +09:00
Trustin Lee
1cb589a950 Replace a loop that runs only once with a single statement (Second take)
Fix potential NoSuchElementException
2012-11-12 09:39:16 +09:00
Trustin Lee
18f1b1f1d0 Replace a loop that runs only once with a single statement 2012-11-12 09:35:50 +09:00
Trustin Lee
aa7cd691df Remove redundant 'else' branches. 2012-11-12 09:31:40 +09:00
Trustin Lee
91a61d7f43 Remove unnecessary qualifiers 2012-11-12 09:11:48 +09:00
Norman Maurer
fa805c4c13 Allow easier use of AIO transport via bootstrap. Related to [#725] 2012-11-10 20:43:53 +01:00
Trustin Lee
1cc104e1c0 Fix a compilation error 2012-11-10 08:51:59 +09:00
Trustin Lee
b4f796c5e3 Use 'x' over "x" wherever possible / String.equals("") -> isEmpty() 2012-11-10 08:03:52 +09:00
Trustin Lee
05c416b674 Add 'static' modifier to the methods that don't need to be member methods 2012-11-10 07:54:33 +09:00
Trustin Lee
f77f13faf0 Make classes static wherever possible 2012-11-10 07:32:53 +09:00
Trustin Lee
0d0eb0abfb Remove unused imports 2012-11-10 07:05:18 +09:00
Trustin Lee
23883d25ee Remove various unnecessary qualifiers 2012-11-10 07:03:07 +09:00
Trustin Lee
b9fbed49bd Suppress false positives related with utility class inspections.
IntelliJ IDEA inspection for private utility classes seems flawed.
2012-11-10 06:53:34 +09:00
Trustin Lee
958d04a42b Remove redundant throws clauses / Suppress inspections for some false positives 2012-11-10 06:47:59 +09:00
Trustin Lee
a5a19efb4b Remove unnecessary this, parenthesis, and semicolons 2012-11-10 02:27:33 +09:00
Trustin Lee
a9cfde97f0 Add missing final modifiers 2012-11-10 02:19:11 +09:00
Trustin Lee
58ba0de659 Remove unnecessarily qualified static access 2012-11-10 01:32:21 +09:00
Trustin Lee
bbcb035246 Prefer isEmpty() over size() == 0 or length() == 0 2012-11-10 01:24:04 +09:00
Trustin Lee
8c0e5626c2 Remove concatenation with empty string 2012-11-09 17:55:28 +09:00
Trustin Lee
57aa842b63 Move private methods only used from inner classes to the inner classes 2012-11-09 17:17:25 +09:00
Norman Maurer
1a7e7a1bff [#654] Fix race which could lead to some concurrent side-effects like raise a ConcurrentModificationException when using the nio transport 2012-11-07 19:15:11 +01:00
Trustin Lee
43dc0bd8a3 [#275 & #686] Ability to pass a custom parameter to Bootstrap.connect() / Replace Bootstrap.newBootstrap() with duplicate()
- Add Bootstrap.attr() and ServerBootstrap.attr()/childAttr() so that a
  user can initialize the attribute map from the beginning.
- Replace newBootstrap() with duplicate()
2012-10-26 14:55:24 -07:00
Trustin Lee
3bc330d477 Remove unnecessarily split line 2012-10-24 17:09:40 -07:00
Trustin Lee
abd37dacd6 [#681] Allow a user to access the Selector of an EventLoop
- Make NioEventLoop public so that a user can downcast it
- Add NioEventLoop.register()
- Add NioTask to let user specify what to do on select()
2012-10-24 17:08:42 -07:00
Trustin Lee
63d3210cff NioUnsafe.ch() should return SelectableChannel 2012-10-24 11:37:41 -07:00
Norman Maurer
985fa97c9b Check if message is supported before cast. See #678 2012-10-24 07:03:02 +02:00
Trustin Lee
c43b9b4dd2 [#662] Fix race in AioEventLoopGroup
- Fix a bug where shutdown() blocks indefinitely sometimes
2012-10-23 16:09:59 -07:00