org.jboss.netty.handler.codec.compression

类 ZlibEncoder

java.lang.Object

org.jboss.netty.handler.codec.oneone.OneToOneEncoder

org.jboss.netty.handler.codec.oneone.OneToOneStrictEncoder

org.jboss.netty.handler.codec.compression.ZlibEncoder

所有已实现的接口:

ChannelDownstreamHandler, ChannelHandler, LifeCycleAwareChannelHandler

public class ZlibEncoder
extends OneToOneStrictEncoder
implements LifeCycleAwareChannelHandler

Compresses a ChannelBuffer using the deflate algorithm.

嵌套类概要

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

ChannelHandler.Sharable

构造器概要

构造器

构造器和说明
ZlibEncoder() 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).
ZlibEncoder(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.
ZlibEncoder(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).
ZlibEncoder(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.
ZlibEncoder(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.
ZlibEncoder(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.
ZlibEncoder(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.
ZlibEncoder(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
void	afterAdd(ChannelHandlerContext ctx)
void	afterRemove(ChannelHandlerContext ctx)
void	beforeAdd(ChannelHandlerContext ctx)
void	beforeRemove(ChannelHandlerContext ctx)
ChannelFuture	close()
protected java.lang.Object	encode(ChannelHandlerContext ctx, Channel channel, java.lang.Object msg) Transforms the specified message into another message and return the transformed message.
void	handleDownstream(ChannelHandlerContext ctx, ChannelEvent evt) Handles the specified downstream event.
boolean	isClosed()

从类继承的方法 org.jboss.netty.handler.codec.oneone.OneToOneStrictEncoder

doEncode

从类继承的方法 java.lang.Object

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

构造器详细资料

ZlibEncoder

public ZlibEncoder()

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

ZlibEncoder

public ZlibEncoder(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

ZlibEncoder

public ZlibEncoder(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

ZlibEncoder

public ZlibEncoder(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

ZlibEncoder

public ZlibEncoder(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

ZlibEncoder

public ZlibEncoder(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

ZlibEncoder

public ZlibEncoder(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

ZlibEncoder

public ZlibEncoder(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()

isClosed

public boolean isClosed()

encode

protected java.lang.Object encode(ChannelHandlerContext ctx,
                      Channel channel,
                      java.lang.Object msg)
                           throws java.lang.Exception

从类复制的说明: OneToOneEncoder

Transforms the specified message into another message and return the transformed message. Note that you can not return null, unlike you can in OneToOneDecoder.decode(ChannelHandlerContext, Channel, Object); you must return something, at least ChannelBuffers.EMPTY_BUFFER.

指定者:

encode 在类中 OneToOneEncoder

抛出:

java.lang.Exception

handleDownstream

public void handleDownstream(ChannelHandlerContext ctx,
                    ChannelEvent evt)
                      throws java.lang.Exception

从接口复制的说明: ChannelDownstreamHandler

Handles the specified downstream event.

指定者:

handleDownstream 在接口中 ChannelDownstreamHandler

覆盖:

handleDownstream 在类中 OneToOneEncoder

参数:

ctx - the context object for this handler

evt - the downstream event to process or intercept

抛出:

java.lang.Exception

beforeAdd

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

指定者:

beforeAdd 在接口中 LifeCycleAwareChannelHandler

抛出:

java.lang.Exception

afterAdd

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

指定者:

afterAdd 在接口中 LifeCycleAwareChannelHandler

抛出:

java.lang.Exception

beforeRemove

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

指定者:

beforeRemove 在接口中 LifeCycleAwareChannelHandler

抛出:

java.lang.Exception

afterRemove

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

指定者:

afterRemove 在接口中 LifeCycleAwareChannelHandler

抛出:

java.lang.Exception