org.jboss.netty.handler.codec.protobuf

类 ProtobufDecoder

java.lang.Object

org.jboss.netty.handler.codec.oneone.OneToOneDecoder

org.jboss.netty.handler.codec.protobuf.ProtobufDecoder

所有已实现的接口:

ChannelHandler, ChannelUpstreamHandler

@ChannelHandler.Sharable
public class ProtobufDecoder
extends OneToOneDecoder

Decodes a received ChannelBuffer into a Google Protocol Buffers Message and MessageLite. Please note that this decoder must be used with a proper FrameDecoder such as ProtobufVarint32FrameDecoder or LengthFieldBasedFrameDecoder if you are using a stream-based transport such as TCP/IP. A typical setup for TCP/IP would be:

 ChannelPipeline pipeline = ...;

 // Decoders
 pipeline.addLast("frameDecoder",
                  new LengthFieldBasedFrameDecoder(1048576, 0, 4, 0, 4));
 pipeline.addLast("protobufDecoder",
                  new ProtobufDecoder(MyMessage.getDefaultInstance()));

 // Encoder
 pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
 pipeline.addLast("protobufEncoder", new ProtobufEncoder());
 

and then you can use a MyMessage instead of a ChannelBuffer as a message:

 void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
     MyMessage req = (MyMessage) e.getMessage();
     MyMessage res = MyMessage.newBuilder().setText(
                               "Did you say '" + req.getText() + "'?").build();
     ch.write(res);
 }
 

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
ProtobufDecoder(MessageLite prototype) Creates a new instance.
ProtobufDecoder(MessageLite prototype, ExtensionRegistry extensionRegistry)

方法概要

方法

限定符和类型	方法和说明
protected java.lang.Object	decode(ChannelHandlerContext ctx, Channel channel, java.lang.Object msg) Transforms the specified received message into another message and return the transformed message.

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

handleUpstream

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

ProtobufDecoder

public ProtobufDecoder(MessageLite prototype)

Creates a new instance.

ProtobufDecoder

public ProtobufDecoder(MessageLite prototype,
               ExtensionRegistry extensionRegistry)

方法详细资料

decode

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

从类复制的说明: OneToOneDecoder

Transforms the specified received message into another message and return the transformed message. Return null if the received message is supposed to be discarded.

指定者:

decode 在类中 OneToOneDecoder

抛出:

java.lang.Exception