io.netty.handler.codec.compression

Class ZstdEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOutboundHandlerAdapter

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

io.netty.handler.codec.compression.ZstdEncoder

All Implemented Interfaces:

ChannelHandler, ChannelOutboundHandler

public final class ZstdEncoder
extends MessageToByteEncoder<ByteBuf>

Compresses a ByteBuf using the Zstandard algorithm. See Zstandard.

Nested Class Summary

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

ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor and Description
ZstdEncoder() Creates a new Zstd encoder.
ZstdEncoder(int compressionLevel) Creates a new Zstd encoder.
ZstdEncoder(int blockSize, int maxEncodeSize) Creates a new Zstd encoder.
ZstdEncoder(int compressionLevel, int blockSize, int maxEncodeSize)

Method Summary

Modifier and Type	Method and Description
protected ByteBuf	allocateBuffer(ChannelHandlerContext ctx, ByteBuf msg, boolean preferDirect) Allocate a ByteBuf which will be used as argument of #encode(ChannelHandlerContext, I, ByteBuf).
protected void	encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) Encode a message into a ByteBuf.
void	flush(ChannelHandlerContext ctx) Calls ChannelHandlerContext.flush() to forward to the next ChannelOutboundHandler in the ChannelPipeline.
void	handlerAdded(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.
void	handlerRemoved(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.

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

acceptOutboundMessage, isPreferDirect, write

Methods inherited from class io.netty.channel.ChannelOutboundHandlerAdapter

bind, close, connect, deregister, disconnect, read

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, exceptionCaught, 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

Constructor Detail

ZstdEncoder

public ZstdEncoder()

Creates a new Zstd encoder. Please note that if you use the default constructor, the default BLOCK_SIZE and MAX_BLOCK_SIZE will be used. If you want to specify BLOCK_SIZE and MAX_BLOCK_SIZE yourself, please use ZstdEncoder(int,int) constructor

ZstdEncoder

public ZstdEncoder(int compressionLevel)

Creates a new Zstd encoder.

Parameters:

compressionLevel - specifies the level of the compression

ZstdEncoder

public ZstdEncoder(int blockSize,
                   int maxEncodeSize)

Creates a new Zstd encoder.

Parameters:

blockSize - is used to calculate the compressionLevel

maxEncodeSize - specifies the size of the largest compressed object

ZstdEncoder

public ZstdEncoder(int compressionLevel,
                   int blockSize,
                   int maxEncodeSize)

Parameters:

blockSize - is used to calculate the compressionLevel

maxEncodeSize - specifies the size of the largest compressed object

compressionLevel - specifies the level of the compression

Method Detail

allocateBuffer

protected ByteBuf allocateBuffer(ChannelHandlerContext ctx,
                                 ByteBuf msg,
                                 boolean preferDirect)

Description copied from class: MessageToByteEncoder

Allocate a ByteBuf which will be used as argument of #encode(ChannelHandlerContext, I, ByteBuf). Sub-classes may override this method to return ByteBuf with a perfect matching initialCapacity.

Overrides:

allocateBuffer in class MessageToByteEncoder<ByteBuf>

encode

protected void encode(ChannelHandlerContext ctx,
                      ByteBuf in,
                      ByteBuf out)

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

flush

public void flush(ChannelHandlerContext ctx)

Description copied from class: ChannelOutboundHandlerAdapter

Calls ChannelHandlerContext.flush() to forward to the next ChannelOutboundHandler in the ChannelPipeline. Sub-classes may override this method to change behavior.

Specified by:

flush in interface ChannelOutboundHandler

Overrides:

flush in class ChannelOutboundHandlerAdapter

Parameters:

ctx - the ChannelHandlerContext for which the flush operation is made

handlerAdded

public void handlerAdded(ChannelHandlerContext ctx)

Description copied from class: ChannelHandlerAdapter

Do nothing by default, sub-classes may override this method.

Specified by:

handlerAdded in interface ChannelHandler

Overrides:

handlerAdded in class ChannelHandlerAdapter

handlerRemoved

public void handlerRemoved(ChannelHandlerContext ctx)
                    throws Exception

Description copied from class: ChannelHandlerAdapter

Do nothing by default, sub-classes may override this method.

Specified by:

handlerRemoved in interface ChannelHandler

Overrides:

handlerRemoved in class ChannelHandlerAdapter

Throws:

Exception