Examples of org.jboss.netty.handler.codec.frame.LengthFieldBasedFrameDecoder

Package org.jboss.netty.handler.codec.frame

Examples of org.jboss.netty.handler.codec.frame.LengthFieldBasedFrameDecoder

org.jboss.netty.handler.codec.frame.LengthFieldBasedFrameDecoder

A decoder that splits the received {@link ChannelBuffer}s dynamically by the value of the length field in the message. It is particularly useful when you decode a binary message which has an integer header field that represents the length of the message body or the whole message.

{@link LengthFieldBasedFrameDecoder} has many configuration parameters sothat it can decode any message with a length field, which is often seen in proprietary client-server protocols. Here are some example that will give you the basic idea on which option does what.

2 bytes length field at offset 0, do not strip header

 lengthFieldOffset   = 0 lengthFieldLength   = 2 lengthAdjustment    = 0 (default) initialBytesToStrip = 0 (default) BEFORE DECODE (14 bytes)         AFTER DECODE (14 bytes) +--------+----------------+      +--------+----------------+ | Length | Actual Content |----->| Length | Actual Content | | 0x000C | "HELLO, WORLD" |      | 0x000C | "HELLO, WORLD" | +--------+----------------+      +--------+----------------+

2 bytes length field at offset 0, strip header

 lengthFieldOffset   = 0 lengthFieldLength   = 2 lengthAdjustment    = 0 initialBytesToStrip = 2 BEFORE DECODE (14 bytes)         AFTER DECODE (12 bytes) +--------+----------------+      +----------------+ | Length | Actual Content |----->| Actual Content | | 0x000C | "HELLO, WORLD" |      | "HELLO, WORLD" | +--------+----------------+      +----------------+

3 bytes length field at the end of 5 bytes header, strip header

 lengthFieldOffset   = 2 (= 5 - 3) lengthFieldLength   = 3 lengthAdjustment    = 0 initialBytesToStrip = 5 BEFORE DECODE (17 bytes)                      AFTER DECODE (12 bytes) +----------+----------+----------------+      +----------------+ | Header 1 |  Length  | Actual Content |----->| Actual Content | |  0xCAFE  | 0x00000C | "HELLO, WORLD" |      | "HELLO, WORLD" | +----------+----------+----------------+      +----------------+

2 bytes length field at offset 1 in the middle of 4 bytes header, strip the first header field and the length field

 lengthFieldOffset   = 1 lengthFieldLength   = 2 lengthAdjustment    = 1 (= the length of HDR2) initialBytesToStrip = 3 (= the length of HDR1 + LEN) BEFORE DECODE (16 bytes)                       AFTER DECODE (13 bytes) +------+--------+------+----------------+      +------+----------------+ | HDR1 | Length | HDR2 | Actual Content |----->| HDR2 | Actual Content | | 0xCA | 0x000C | 0xFE | "HELLO, WORLD" |      | 0xFE | "HELLO, WORLD" | +------+--------+------+----------------+      +------+----------------+

2 bytes length field at offset 1 in the middle of 4 bytes header, strip the first header field and the length field, the length field includes the header length

 lengthFieldOffset   =  1 lengthFieldLength   =  2 lengthAdjustment    = -3 (= the length of HDR1 + LEN, negative) initialBytesToStrip =  3 BEFORE DECODE (16 bytes)                       AFTER DECODE (13 bytes) +------+--------+------+----------------+      +------+----------------+ | HDR1 | Length | HDR2 | Actual Content |----->| HDR2 | Actual Content | | 0xCA | 0x0010 | 0xFE | "HELLO, WORLD" |      | 0xFE | "HELLO, WORLD" | +------+--------+------+----------------+      +------+----------------+

@author The Netty Project (netty-dev@lists.jboss.org) @author Trustin Lee (tlee@redhat.com) @version $Rev:231 $, $Date:2008-06-12 16:44:50 +0900 (목, 12 6월 2008) $ @see LengthFieldPrepender

        this.maxFrameSize = maxFrameSize;
    }


    public ChannelPipeline getPipeline() throws Exception {
        ChannelPipeline pipeline = pipeline();
        pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(maxFrameSize, 0, 4, 0, 4));
        pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
        pipeline.addLast("thriftHandler", (ChannelHandler)handler);
        return pipeline;
    }

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  @Override
  public ChannelPipeline getPipeline() throws Exception
  {
    ChannelPipeline pipeline = Channels.pipeline();
    pipeline.addLast("lengthDecoder", new LengthFieldBasedFrameDecoder(256, 0, 2,0,2));
    pipeline.addLast("lengthFieldPrepender", LENGTH_FIELD_PREPENDER);
    pipeline.addLast("eventDecoder", EVENT_DECODER);
    pipeline.addLast("counter", COUNTER);
    pipeline.addLast("businessHandler",businessHandler);
    pipeline.addLast("canceller",CANCELLER);

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    return pipeline;
  }
  
  public ChannelHandler createLengthBasedFrameDecoder()
  {
    return new LengthFieldBasedFrameDecoder(frameSize, 0, 2, 0, 2);
  }

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     * prepending the length to outgoing packets etc.
     */
    @Override
    public ChannelPipeline getPipeline() throws Exception {
        ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("lengthbasedframedecoder", new LengthFieldBasedFrameDecoder(MAX_FRAME_LENGTH, 0, 4, 0, 4));
        pipeline.addLast("mainhandler", this);
        return pipeline;
    }

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        // Channels helper class.
        ChannelPipeline pipeline = Channels.pipeline();
        if (client.getSslFactory() != null) {
            pipeline.addLast("ssl", new SslHandler(client.getSslFactory().getEngine()));
        }
        pipeline.addLast("lengthbaseddecoder", new LengthFieldBasedFrameDecoder(client.getConfiguration()
                         .getMaximumMessageSize(), 0, 4, 0, 4));
        pipeline.addLast("lengthprepender", new LengthFieldPrepender(4));


        pipeline.addLast("protobufdecoder", new ProtobufDecoder(PubSubProtocol.PubSubResponse.getDefaultInstance()));
        pipeline.addLast("protobufencoder", new ProtobufEncoder());

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                                                                        final int lengthFieldLength, final int lengthAdjustment,
                                                                        final int initialBytesToStrip) {
        return new ChannelHandlerFactory() {
            @Override
            public ChannelHandler newChannelHandler() {
                return new LengthFieldBasedFrameDecoder(maxFrameLength, lengthFieldOffset, lengthFieldLength, lengthAdjustment, initialBytesToStrip);
            }
        };
    }

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        bootstrap = new ServerBootstrap(factory);


        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() {
                ChannelPipeline p = Channels.pipeline();
                p.addLast("1", new LengthFieldBasedFrameDecoder(999999, 0, 4, 0, 4));
                p.addLast("2", new ChannelHandler(handoffQueue));


                return p;
            }
        });

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    this.defaultInstance = defaultInstance;
  }


  public ChannelPipeline getPipeline() throws Exception {
    ChannelPipeline p = Channels.pipeline();
    p.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1048576*2, 0, 4,
        0, 4));
    p.addLast("protobufDecoder", new ProtobufDecoder(defaultInstance));
    p.addLast("frameEncoder", new LengthFieldPrepender(4));
    p.addLast("protobufEncoder", new ProtobufEncoder());
    p.addLast("handler", handler);

View Full Code Here

    }


    @Override
    public ChannelPipeline getPipeline() throws Exception {
        ChannelPipeline p = Channels.pipeline();
        p.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(16 * 1024 * 1024, 0, 4, 0, 4));
        p.addLast("rpcDecoder", rpcDecoder);


        p.addLast("frameEncoder", frameEncoder);
        p.addLast("rpcEncoder", rpcEncoder);

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    this.protocolName = protocolName;
  }


  public LengthFieldBasedFrameDecoder createLengthBasedFrameDecoder()
  {
    return new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 2, 0, 2);
  }

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