Fix buffer leak in test introduced by 282d6e73b82ec943a739201f7be1985c45ef032b
[#2643] Throw TooLongFrameException instead of using fireExceptionCaught

Motivation:

It's not always the case that there is another handler in the pipeline that will intercept the exceptionCaught event because sometimes users just sub-class. In this case the exception will just hit the end of the pipeline.

Modification:
Throw the TooLongFrameException so that sub-classes can handle it in the exceptionCaught(...) method directly.

Result:
Sub-classes can correctly handle the exception,
Fix checkstyle error introduced by 52cb55d3887034df778575799fdd00f174495809
Reuse previous created HttpHeaders by HttpObjectAggregator

Motivation:

HttpObjectAggregator currently creates a new FullHttpResponse / FullHttpRequest for each message it needs to aggregate. While doing so it also creates 2 DefaultHttpHeader instances (one for the headers and one for the trailing headers). This is bad for two reasons:
  - More objects are created then needed and also populate the headers is not for free
  - Headers may get validated even if the validation was disabled in the decoder

Modification:

- Wrap the previous created HttpResponse / HttpRequest and so reuse the original HttpHeaders
- Reuse the previous created trailing HttpHeader.
- Fix a bug where the trailing HttpHeader was incorrectly mixed in the headers.

Result:

- Less GC
- Faster HttpObjectAggregator implementation
[#2650] Allow to disable http header validation in SpdyHttpDecoder and SpdyHttpCodec

Motivation:

HTTP header validation can be expensive so we should allow to disable it like we do in HttpObjectDecoder.

Modification:

Add constructor argument to disable validation.

Result:
Performance improvement
[#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
Fix over-sensible testcase
[#2653] Remove uncessary range checks for performance reasons

Motivation:

I introduced range checks as part of 6c47cc97111146396d2daf1a97051135d2eaf69e in some places. Unfortunally I also added some where these are not needed and so caused a performance regression.

Modification:

Remove range checks where not needed

Result:

Fixed performance regression.
[#2653] Remove unnecessary ensureAccessible() calls

Motivation:

I introduced ensureAccessible() class as part of 6c47cc97111146396d2daf1a97051135d2eaf69e in some places. Unfortunally I also added some where these are not needed and so caused a performance regression.

Modification:

Remove calls where not needed.

Result:

Fixed performance regression.
Fixed NPE in WebSocket00FrameDecoder if end couldn't be found in text frame

Motivation:
When we receive an incomplete WebSocketFrame we need to make sure to wait for more data. Because we not did this we could produce a NPE.

Modification:
Make sure we not try to add null into the RecyclableArrayList

Result:
no more NPE on incomplete frames.
Implemented LZF compression codec

Motivation:

LZF compression codec provides sending and receiving data encoded by very fast LZF algorithm.

Modifications:

- Added Compress-LZF library which implements LZF algorithm
- Implemented LzfEncoder which extends MessageToByteEncoder and provides compression of outgoing messages
- Added tests to verify the LzfEncoder and how it can compress data for the next uncompression using the original library
- Implemented LzfDecoder which extends ByteToMessageDecoder and provides uncompression of incoming messages
- Added tests to verify the LzfDecoder and how it can uncompress data after compression using the original library
- Added integration tests for LzfEncoder/Decoder

Result:

Full LZF compression codec which can compress/uncompress data using LZF algorithm.
Implemented a Bzip2Encoder

Motivation:

Bzip2Encoder provides sending data compressed in bzip2 format.

Modifications:

Added classes:
- Bzip2Encoder
- Bzip2BitWriter
- Bzip2BlockCompressor
- Bzip2DivSufSort
- Bzip2HuffmanAllocator
- Bzip2HuffmanStageEncoder
- Bzip2MTFAndRLE2StageEncoder
- Bzip2EncoderTest

Modified classes:
- Bzip2Constants (splited BLOCK_HEADER_MAGIC and END_OF_STREAM_MAGIC)
- Bzip2Decoder (use splited magic numbers)

Added integration tests for Bzip2Encoder/Decoder

Result:

Implemented new encoder which can compress outgoing data in bzip2 format.
[#2664] Support write-spinning also in native transport

Motivation:

In our nio implementation we use write-spinning for maximize throughput, but in the native implementation this is not used.

Modification:

Respect writeSpinCount in native transport.

Result:

Better throughput
 [#2647] Handle IOV_MAX in java code

Motivation:

The handling of IOV_MAX was done in JNI code base which makes stuff really complicated to maintain etc.

Modifications:

Move handling of IOV_MAX to java code to simplify stuff

Result:

Cleaner code.
[#2666] Fix possible NPE when try to fullfill connect ChannelPromise

Motivation:

Because of a missing return statement we may produce a NPE when try to fullfill the connect ChannelPromise when it was fullfilled before.

Modification:

Add missing return statement.

Result:

No more NPE.
[#2667] Write until EAGAIN in native transport

Motivation:

We need to continue write until we hit EAGAIN to make sure we not see an starvation

Modification:

Write until EAGAIN is returned

Result:

No starvation when using native transport with ET.
[#2665] Continue writing on IOException when using DatagramChannel

Motivation:

As a DatagramChannel supports to write to multiple remote peers we must not close the Channel once a IOException accours as this error may be only valid for one remote peer.

Modification:

Continue writing on IOException.

Result:

DatagramChannel can be used even after an IOException accours during writing.
[#2667] Write until EAGAIN in native transport and only call setEpollOut() in this case

Motivation:

In the previous fix for #2667 I did introduce a bit overhead by calling setEpollOut() too often.

Modification:

Only call setEpollOut() if really needed and remove unused code.

Result:

Less overhead when saturate network.
Fix buffer leak in Bzip2EncoderTest
Close ObjectInputStream in ObjectDecoder.decode(...)

Motivation:

We create a new CompactObjectInputStream with ByteBufInputStream in ObjectDecoder.decode(...) method and don't close this InputStreams before return statement.

Modifications:

Save link to the ObjectInputStream and close it before return statement.

Result:

Close InputStreams and clean up unused resources. It will be better for GC.