io.netty.handler.codec.compression

Class FastLzFrameEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOutboundHandlerAdapter

io.netty.handler.codec.MessageToByteEncoder<io.netty.buffer.ByteBuf>

io.netty.handler.codec.compression.FastLzFrameEncoder

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelOutboundHandler

public class FastLzFrameEncoder
extends MessageToByteEncoder<io.netty.buffer.ByteBuf>

Compresses a ByteBuf using the FastLZ algorithm. See FastLZ format.

Nested Class Summary

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

io.netty.channel.ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor and Description
FastLzFrameEncoder() Creates a FastLZ encoder without checksum calculator and with auto detection of compression level.
FastLzFrameEncoder(boolean validateChecksums) Creates a FastLZ encoder with auto detection of compression level and calculation of checksums as specified.
FastLzFrameEncoder(int level) Creates a FastLZ encoder with specified compression level and without checksum calculator.
FastLzFrameEncoder(int level, Checksum checksum) Creates a FastLZ encoder with specified compression level and checksum calculator.

Method Summary

Modifier and Type	Method and Description
protected void	encode(io.netty.channel.ChannelHandlerContext ctx, io.netty.buffer.ByteBuf in, io.netty.buffer.ByteBuf out) Encode a message into a ByteBuf.

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

acceptOutboundMessage, allocateBuffer, isPreferDirect, write

Methods inherited from class io.netty.channel.ChannelOutboundHandlerAdapter

bind, close, connect, deregister, disconnect, flush, read

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, exceptionCaught, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.netty.channel.ChannelHandler

exceptionCaught, handlerAdded, handlerRemoved

Constructor Detail

FastLzFrameEncoder

public FastLzFrameEncoder()

Creates a FastLZ encoder without checksum calculator and with auto detection of compression level.

FastLzFrameEncoder

public FastLzFrameEncoder(int level)

Creates a FastLZ encoder with specified compression level and without checksum calculator.

Parameters:

level - supports only these values: 0 - Encoder will choose level automatically depending on the length of the input buffer. 1 - Level 1 is the fastest compression and generally useful for short data. 2 - Level 2 is slightly slower but it gives better compression ratio.

FastLzFrameEncoder

public FastLzFrameEncoder(boolean validateChecksums)

Creates a FastLZ encoder with auto detection of compression level and calculation of checksums as specified.

Parameters:

validateChecksums - If true, the checksum of each block will be calculated and this value will be added to the header of block. By default FastLzFrameEncoder uses Adler32 for checksum calculation.

FastLzFrameEncoder

public FastLzFrameEncoder(int level,
                          Checksum checksum)

Creates a FastLZ encoder with specified compression level and checksum calculator.

Parameters:

level - supports only these values: 0 - Encoder will choose level automatically depending on the length of the input buffer. 1 - Level 1 is the fastest compression and generally useful for short data. 2 - Level 2 is slightly slower but it gives better compression ratio.

checksum - the Checksum instance to use to check data for integrity. You may set null if you don't want to validate checksum of each block.

Method Detail

encode

protected void encode(io.netty.channel.ChannelHandlerContext ctx,
                      io.netty.buffer.ByteBuf in,
                      io.netty.buffer.ByteBuf out)
               throws Exception

Description copied from class: MessageToByteEncoder

Encode a message into a ByteBuf. This method will be called for each written message that can be handled by this encoder.

Specified by:

encode in class MessageToByteEncoder<io.netty.buffer.ByteBuf>

Parameters:

ctx - the ChannelHandlerContext which this MessageToByteEncoder belongs to

in - the message to encode

out - the ByteBuf into which the encoded message will be written

Throws:

Exception - is thrown if an error occurs