io.netty.handler.codec.compression

类 JZlibEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOutboundHandlerAdapter

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

io.netty.handler.codec.compression.ZlibEncoder

io.netty.handler.codec.compression.JZlibEncoder

所有已实现的接口:

ChannelHandler, ChannelOutboundHandler

public class JZlibEncoder
extends ZlibEncoder

Compresses a ByteBuf using the deflate algorithm.

嵌套类概要

从接口继承的嵌套类/接口 io.netty.channel.ChannelHandler

ChannelHandler.Sharable

构造器概要

构造器

构造器和说明
JZlibEncoder() Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).
JZlibEncoder(byte[] dictionary) Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified preset dictionary.
JZlibEncoder(int compressionLevel) Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).
JZlibEncoder(int compressionLevel, byte[] dictionary) Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified preset dictionary.
JZlibEncoder(int compressionLevel, int windowBits, int memLevel, byte[] dictionary) Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified preset dictionary.
JZlibEncoder(ZlibWrapper wrapper) Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified wrapper.
JZlibEncoder(ZlibWrapper wrapper, int compressionLevel) Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified wrapper.
JZlibEncoder(ZlibWrapper wrapper, int compressionLevel, int windowBits, int memLevel) Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified wrapper.

方法概要

方法

限定符和类型	方法和说明
ChannelFuture	close() Close this ZlibEncoder and so finish the encoding.
void	close(ChannelHandlerContext ctx, ChannelPromise promise) Calls ChannelHandlerContext.close(ChannelPromise) to forward to the next ChannelOutboundHandler in the ChannelPipeline.
ChannelFuture	close(ChannelPromise promise) Close this ZlibEncoder and so finish the encoding.
protected void	encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) Encode a message into a ByteBuf.
void	handlerAdded(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.
boolean	isClosed() Returns true if and only if the end of the compressed stream has been reached.

从类继承的方法 io.netty.handler.codec.MessageToByteEncoder

acceptOutboundMessage, allocateBuffer, write

从类继承的方法 io.netty.channel.ChannelOutboundHandlerAdapter

bind, connect, deregister, disconnect, flush, read

从类继承的方法 io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, exceptionCaught, handlerRemoved, isSharable

从类继承的方法 java.lang.Object

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

从接口继承的方法 io.netty.channel.ChannelHandler

exceptionCaught, handlerRemoved

构造器详细资料

JZlibEncoder

public JZlibEncoder()

Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(int compressionLevel)

Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).

参数:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(ZlibWrapper wrapper)

Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified wrapper.

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(ZlibWrapper wrapper,
            int compressionLevel)

Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified wrapper.

参数:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(ZlibWrapper wrapper,
            int compressionLevel,
            int windowBits,
            int memLevel)

Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified wrapper.

参数:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

windowBits - The base two logarithm of the size of the history buffer. The value should be in the range 9 to 15 inclusive. Larger values result in better compression at the expense of memory usage. The default value is 15.

memLevel - How much memory should be allocated for the internal compression state. 1 uses minimum memory and 9 uses maximum memory. Larger values result in better and faster compression at the expense of memory usage. The default value is 8

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(byte[] dictionary)

Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified preset dictionary. The wrapper is always ZlibWrapper.ZLIB because it is the only format that supports the preset dictionary.

参数:

dictionary - the preset dictionary

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(int compressionLevel,
            byte[] dictionary)

Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified preset dictionary. The wrapper is always ZlibWrapper.ZLIB because it is the only format that supports the preset dictionary.

参数:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

dictionary - the preset dictionary

抛出:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(int compressionLevel,
            int windowBits,
            int memLevel,
            byte[] dictionary)

Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified preset dictionary. The wrapper is always ZlibWrapper.ZLIB because it is the only format that supports the preset dictionary.

参数:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

windowBits - The base two logarithm of the size of the history buffer. The value should be in the range 9 to 15 inclusive. Larger values result in better compression at the expense of memory usage. The default value is 15.

memLevel - How much memory should be allocated for the internal compression state. 1 uses minimum memory and 9 uses maximum memory. Larger values result in better and faster compression at the expense of memory usage. The default value is 8

dictionary - the preset dictionary

抛出:

CompressionException - if failed to initialize zlib

方法详细资料

close

public ChannelFuture close()

从类复制的说明: ZlibEncoder

Close this ZlibEncoder and so finish the encoding. The returned ChannelFuture will be notified once the operation completes.

指定者:

close 在类中 ZlibEncoder

close

public ChannelFuture close(ChannelPromise promise)

从类复制的说明: ZlibEncoder

Close this ZlibEncoder and so finish the encoding. The given ChannelFuture will be notified once the operation completes and will also be returned.

指定者:

close 在类中 ZlibEncoder

isClosed

public boolean isClosed()

从类复制的说明: ZlibEncoder

Returns true if and only if the end of the compressed stream has been reached.

指定者:

isClosed 在类中 ZlibEncoder

encode

protected void encode(ChannelHandlerContext ctx,
          ByteBuf in,
          ByteBuf out)
               throws java.lang.Exception

从类复制的说明: MessageToByteEncoder

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

指定者:

encode 在类中 MessageToByteEncoder<ByteBuf>

参数:

ctx - the ChannelHandlerContext which this MessageToByteEncoder belongs to

in - the message to encode

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

抛出:

java.lang.Exception - is thrown if an error occurs

close

public void close(ChannelHandlerContext ctx,
         ChannelPromise promise)

从类复制的说明: ChannelOutboundHandlerAdapter

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

指定者:

close 在接口中 ChannelOutboundHandler

覆盖:

close 在类中 ChannelOutboundHandlerAdapter

参数:

ctx - the ChannelHandlerContext for which the close operation is made

promise - the ChannelPromise to notify once the operation completes

handlerAdded

public void handlerAdded(ChannelHandlerContext ctx)
                  throws java.lang.Exception

从类复制的说明: ChannelHandlerAdapter

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

指定者:

handlerAdded 在接口中 ChannelHandler

覆盖:

handlerAdded 在类中 ChannelHandlerAdapter

抛出:

java.lang.Exception