Related: #4333#4421#5128
Motivation:
slice(), duplicate() and readSlice() currently create a non-recyclable
derived buffer instance. Under heavy load, an application that creates a
lot of derived buffers can put the garbage collector under pressure.
Modifications:
- Add the following methods which creates a non-recyclable derived buffer
- retainedSlice()
- retainedDuplicate()
- readRetainedSlice()
- Add the new recyclable derived buffer implementations, which has its
own reference count value
- Add ByteBufHolder.retainedDuplicate()
- Add ByteBufHolder.replace(ByteBuf) so that..
- a user can replace the content of the holder in a consistent way
- copy/duplicate/retainedDuplicate() can delegate the holder
construction to replace(ByteBuf)
- Use retainedDuplicate() and retainedSlice() wherever possible
- Miscellaneous:
- Rename DuplicateByteBufTest to DuplicatedByteBufTest (missing 'D')
- Make ReplayingDecoderByteBuf.reject() return an exception instead of
throwing it so that its callers don't need to add dummy return
statement
Result:
Derived buffers are now recycled when created via retainedSlice() and
retainedDuplicate() and derived from a pooled buffer
Motivation:
Some codecs should be considered unstable as these are relative new. For this purpose we should introduce an annotation which these codecs should us to be marked as unstable in terms of API.
Modifications:
- Add UnstableApi annotation and use it on codecs that are not stable
- Move http2.hpack to http2.internal.hpack as it is internal.
Result:
Better document unstable APIs.
Motivation:
It's better to have some tests for FullMemcacheMessageRequest and FullMemcacheMessageResponse to avoid regression like #5197.
Modifications:
Add tests for FullMemcacheMessageRequest and FullMemcacheMessageResponse.
Result:
There are some basic tests for FullMemcacheMessageRequest and FullMemcacheMessageResponse.
Motivation:
This reverts commit 3405aee2ab. This commit introduces a bug and the encoder no longer encodes FullMemcacheMessage objects correctly.
Modifications:
- Revert commit
Result:
Fixes https://github.com/netty/netty/issues/5197
Motivation:
People need to set all length fields manually when creating a memcache message and it's error prone. See #2736 for more dicussion.
Modifications:
This patch adds the logic to update the keyLength, extrasLength and totalBodyLength when key, extras or content is set.
Result:
The length fields of memcache messages will be updated automatically.
Motivation:
The key can be ByteBuf to avoid converting between ByteBuf and String. See #3689.
Modifications:
Replace the type of key with ByteBuf.
Result:
The type of key becomes ByteBuf.
Motivation:
Some duplicated methods in message types of codec-memcache can be cleaned using AbstractReferenceCounted.
Modifications:
Use AbstractReferenceCounted to avoid duplicated methods.
Result:
Duplicated methods are cleaned.
Motivation:
BinaryMemcacheObjectAggregator doesn't retain ByteBuf `extras`. So `io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1` will be thrown when aggregating a message containing `extras`. See the unit test for an example.
Modifications:
`ratain` extras to fix IllegalReferenceCountException.
Result:
`extras` is retained.
Motivation:
AbstractBinaryMemcacheDecoder.currentMessage is not retained after sending it out. Hence, if a message contains `extras`, `io.netty.util.IllegalReferenceCountException` will be thrown in `channelInactive`.
Modifications:
Retain AbstractBinaryMemcacheDecoder.currentMessage After putting it to `out` and release it when it's not used.
Result:
No IllegalReferenceCountException or leak.
Motivation
----------
Currently, only the fixed 24 bytes are allocated for the header and
then all the params as well as the optional extras and key are written
into the header section.
It is very likely that the buffer needs to expand at least two times
if either the extras and/or the key take up more space.
Modifications
-------------
Since at the point of allocation we know the key and extras length,
the buffer can be preallocated with the exact size, avoiding unnecessary
resizing and even allocating too much (since it uses power of two
internally).
Result
------
Less buffer resizing needed when encoding a memcache operation.
Motivation:
ChannelInboundHandler and ChannelOutboundHandler both can implement exceptionCaught(...) method and so we need to dispatch to both of them.
Modifications:
- Correctly first dispatch exceptionCaught to the ChannelInboundHandler but also make sure the next handler it will be dispatched to will be the ChannelOutboundHandler
- Add removeInboundHandler() and removeOutboundHandler() which allows to remove one of the combined handlers
- Let *Codec extends it and not ChannelHandlerAppender
- Remove ChannelHandlerAppender
Result:
Correctly handle events and also have same behavior as in 4.0
Motivation:
As part of merging / cherry-picking there were some Erroneous imports added to AbstractMemcacheObjectAggregator.
Modifications:
- Remove Imports from AbstractMemcacheObjectAggregator.
Result:
Code now builds.
Motivation:
The HttpObjectAggregator always responds with a 100-continue response. It should check the Content-Length header to see if the content length is OK, and if not responds with a 417.
Modifications:
- HttpObjectAggregator checks the Content-Length header in the case of a 100-continue.
Result:
HttpObjectAggregator responds with 417 if content is known to be too big.
Motivation:
Current AbstractMemcacheObjectEncoder does unnecessary message type checking if the message is MemcacheMessage type.
Modifications:
Returns after encoding MemcacheMessage message.
Result:
Small performance improvement for this encoder.
