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

        ChannelPipeline pipeline = Channels.pipeline();
        if (sslFactory != null) {
            pipeline.addLast("ssl", new SslHandler(sslFactory.getEngine()));
        }
        pipeline.addLast("lengthbaseddecoder",
                         new LengthFieldBasedFrameDecoder(maxMessageSize, 0, 4, 0, 4));
        pipeline.addLast("lengthprepender", new LengthFieldPrepender(4));


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

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    @Override
    public ChannelPipeline getPipeline() throws Exception {
        ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("lengthbaseddecoder",
                         new LengthFieldBasedFrameDecoder(1024 * 1024, 0, 4, 0, 4));
        pipeline.addLast("lengthprepender", new LengthFieldPrepender(4));
        pipeline.addLast("main", this);
        return pipeline;
    }

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        // Channels helper class.
        ChannelPipeline pipeline = Channels.pipeline();
        if (channelManager.getSslFactory() != null) {
            pipeline.addLast("ssl", new SslHandler(channelManager.getSslFactory().getEngine()));
        }
        pipeline.addLast("lengthbaseddecoder", new LengthFieldBasedFrameDecoder(
                         cfg.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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            readTimeoutTimer = new HashedWheelTimer();
        }


        pipeline.addLast("readTimeout", new ReadTimeoutHandler(readTimeoutTimer, 
                                                               conf.getReadTimeout()));
        pipeline.addLast("lengthbasedframedecoder", new LengthFieldBasedFrameDecoder(MAX_FRAME_LENGTH, 0, 4, 0, 4));
        pipeline.addLast("mainhandler", this);
        return pipeline;
    }

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

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                    throws Exception {
                ChannelPipeline cp = Channels.pipeline();
                cp.addLast("frameEncoder", new LengthFieldPrepender(LENGTH_FIELD_LENGTH));
                cp.addLast(
                        "frameDecoder",
                        new LengthFieldBasedFrameDecoder(
                                maxFrameSize,
                                LENGTH_FIELD_OFFSET,
                                LENGTH_FIELD_LENGTH,
                                LENGTH_ADJUSTMENT,
                                INITIAL_BYTES_TO_STRIP));

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


                return p;
            }
        });

View Full Code Here

    }


    @Override
    public ChannelPipeline getPipeline() throws Exception {
        final ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder((int) ((1L << (lengthFieldSize * 8)) - 1) & (-1 >>> 1), 0, lengthFieldSize, 0, lengthFieldSize));
        pipeline.addLast("frameEncoder", new LengthFieldPrepender(lengthFieldSize, false));
        if (executor != null)
            pipeline.addLast("executor", new ExecutionHandler(executor));
        pipeline.addLast("logging", new LoggingHandler(logger));
        // a node resolver must be added before the mesage codec

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        ServerBootstrap bootstrap = new ServerBootstrap(factory);
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                return Channels.pipeline(
                        new LengthFieldBasedFrameDecoder(255 + 3, 0, 1, 2, 0),
                        new Handler());
            }
        });
        bootstrap.setOption("reuseAddress", true);
        bootstrap.setOption("child.tcpNoDelay", true);

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