io.netty.handler.codec.compression

Class SnappyFrameDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.compression.SnappyFrameDecoder

All Implemented Interfaces:

ChannelHandler

public class SnappyFrameDecoder
extends ByteToMessageDecoder

Uncompresses a ByteBuf encoded with the Snappy framing format. See http://code.google.com/p/snappy/source/browse/trunk/framing_format.txt Note that by default, validation of the checksum header in each chunk is DISABLED for performance improvements. If performance is less of an issue, or if you would prefer the safety that checksum validation brings, please use the SnappyFrameDecoder(boolean) constructor with the argument set to true.

Nested Class Summary

Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder

ByteToMessageDecoder.Cumulator

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

ChannelHandler.Sharable, ChannelHandler.Skip

Field Summary

Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors

Constructor and Description
SnappyFrameDecoder() Creates a new snappy-framed decoder with validation of checksums turned OFF.
SnappyFrameDecoder(boolean validateChecksums) Creates a new snappy-framed decoder with validation of checksums as specified.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) Decode the from one ByteBuf to an other.

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder

actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setSingleDecode

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

bind, channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, close, connect, deregister, disconnect, exceptionCaught, flush, handlerAdded, isSharable, read, userEventTriggered, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SnappyFrameDecoder

public SnappyFrameDecoder()

Creates a new snappy-framed decoder with validation of checksums turned OFF. To turn checksum validation on, please use the alternate SnappyFrameDecoder(boolean) constructor.

SnappyFrameDecoder

public SnappyFrameDecoder(boolean validateChecksums)

Creates a new snappy-framed decoder with validation of checksums as specified.

Parameters:

validateChecksums - If true, the checksum field will be validated against the actual uncompressed data, and if the checksums do not match, a suitable DecompressionException will be thrown

Method Detail

decode

protected void decode(ChannelHandlerContext ctx,
          ByteBuf in,
          List<Object> out)
               throws Exception

Description copied from class: ByteToMessageDecoder

Decode the from one ByteBuf to an other. This method will be called till either the input ByteBuf has nothing to read when return from this method or till nothing was read from the input ByteBuf.

Specified by:

decode in class ByteToMessageDecoder

Parameters:

ctx - the ChannelHandlerContext which this ByteToMessageDecoder belongs to

in - the ByteBuf from which to read data

out - the List to which decoded messages should be added

Throws:

Exception - is thrown if an error accour