io.netty.handler.codec.compression

Class LzfEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

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

io.netty.handler.codec.compression.LzfEncoder

All Implemented Interfaces:

ChannelHandler

public class LzfEncoder
extends MessageToByteEncoder<ByteBuf>

Compresses a ByteBuf using the LZF format. See original LZF package and LZF format for full description.

Nested Class Summary

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

ChannelHandler.Sharable, ChannelHandler.Skip

Constructor Summary

Constructors

Constructor and Description
LzfEncoder() Creates a new LZF encoder with the most optimal available methods for underlying data access.
LzfEncoder(boolean safeInstance) Creates a new LZF encoder with specified encoding instance.
LzfEncoder(boolean safeInstance, int totalLength) Creates a new LZF encoder with specified settings.
LzfEncoder(int totalLength) Creates a new LZF encoder with specified total length of encoded chunk.

Method Summary

Methods

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

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

acceptOutboundMessage, allocateBuffer, write

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

bind, channelActive, channelInactive, channelRead, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, close, connect, deregister, disconnect, exceptionCaught, flush, handlerAdded, handlerRemoved, isSharable, read, userEventTriggered

Methods inherited from class java.lang.Object

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

Constructor Detail

LzfEncoder

public LzfEncoder()

Creates a new LZF encoder with the most optimal available methods for underlying data access. It will "unsafe" instance if one can be used on current JVM. It should be safe to call this constructor as implementations are dynamically loaded; however, on some non-standard platforms it may be necessary to use LzfEncoder(boolean) with true param.

LzfEncoder

public LzfEncoder(boolean safeInstance)

Creates a new LZF encoder with specified encoding instance.

Parameters:

safeInstance - If true encoder will use ChunkEncoder that only uses standard JDK access methods, and should work on all Java platforms and JVMs. Otherwise encoder will try to use highly optimized ChunkEncoder implementation that uses Sun JDK's Unsafe class (which may be included by other JDK's as well).

LzfEncoder

public LzfEncoder(int totalLength)

Creates a new LZF encoder with specified total length of encoded chunk. You can configure it to encode your data flow more efficient if you know the avarage size of messages that you send.

Parameters:

totalLength - Expected total length of content to compress; only matters for outgoing messages that is smaller than maximum chunk size (64k), to optimize encoding hash tables.

LzfEncoder

public LzfEncoder(boolean safeInstance,
          int totalLength)

Creates a new LZF encoder with specified settings.

Parameters:

safeInstance - If true encoder will use ChunkEncoder that only uses standard JDK access methods, and should work on all Java platforms and JVMs. Otherwise encoder will try to use highly optimized ChunkEncoder implementation that uses Sun JDK's Unsafe class (which may be included by other JDK's as well).

totalLength - Expected total length of content to compress; only matters for outgoing messages that is smaller than maximum chunk size (64k), to optimize encoding hash tables.

Method Detail

encode

protected void encode(ChannelHandlerContext ctx,
          ByteBuf in,
          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<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 accour