io.netty.handler.codec.http

Class HttpContentCompressor

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.channel.ChannelDuplexHandler

io.netty.handler.codec.MessageToMessageCodec<HttpRequest,HttpObject>

io.netty.handler.codec.http.HttpContentEncoder

io.netty.handler.codec.http.HttpContentCompressor

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler, ChannelOutboundHandler

public class HttpContentCompressor
extends HttpContentEncoder

Compresses an HttpMessage and an HttpContent in gzip or deflate encoding while respecting the "Accept-Encoding" header. If there is no matching encoding, no compression is done. For more information on how this handler modifies the message, please refer to HttpContentEncoder.

Nested Class Summary

Nested classes/interfaces inherited from class io.netty.handler.codec.http.HttpContentEncoder

HttpContentEncoder.Result

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

ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor and Description
HttpContentCompressor() Creates a new handler with the default compression level (6), default window size (15) and default memory level (8).
HttpContentCompressor(int compressionLevel) Creates a new handler with the specified compression level, default window size (15) and default memory level (8).
HttpContentCompressor(int compressionLevel, int windowBits, int memLevel) Creates a new handler with the specified compression level, window size, and memory level..

Method Summary

Modifier and Type	Method and Description
protected HttpContentEncoder.Result	beginEncode(HttpResponse headers, String acceptEncoding) Prepare to encode the HTTP message content.
protected ZlibWrapper	determineWrapper(String acceptEncoding)
void	handlerAdded(ChannelHandlerContext ctx) Do nothing by default, sub-classes may override this method.

Methods inherited from class io.netty.handler.codec.http.HttpContentEncoder

acceptOutboundMessage, channelInactive, decode, encode, handlerRemoved

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

acceptInboundMessage, channelRead, write

Methods inherited from class io.netty.channel.ChannelDuplexHandler

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

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, 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

HttpContentCompressor

public HttpContentCompressor()

Creates a new handler with the default compression level (6), default window size (15) and default memory level (8).

HttpContentCompressor

public HttpContentCompressor(int compressionLevel)

Creates a new handler with the specified compression level, default window size (15) and default memory level (8).

Parameters:

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

HttpContentCompressor

public HttpContentCompressor(int compressionLevel,
                             int windowBits,
                             int memLevel)

Creates a new handler with the specified compression level, window size, and memory level..

Parameters:

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

Method Detail

handlerAdded

public void handlerAdded(ChannelHandlerContext ctx)
                  throws Exception

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

Throws:

Exception

beginEncode

protected HttpContentEncoder.Result beginEncode(HttpResponse headers,
                                                String acceptEncoding)
                                         throws Exception

Description copied from class: HttpContentEncoder

Prepare to encode the HTTP message content.

Specified by:

beginEncode in class HttpContentEncoder

Parameters:

headers - the headers

acceptEncoding - the value of the "Accept-Encoding" header

Returns:

the result of preparation, which is composed of the determined target content encoding and a new EmbeddedChannel that encodes the content into the target content encoding. null if acceptEncoding is unsupported or rejected and thus the content should be handled as-is (i.e. no encoding).

Throws:

Exception

determineWrapper

protected ZlibWrapper determineWrapper(String acceptEncoding)