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

    private void initRuptelaServer(final String protocol) throws SQLException {
        if (isProtocolEnabled(properties, protocol)) {
            serverList.add(new TrackerServer(this, new ServerBootstrap(), protocol) {
                @Override
                protected void addSpecificHandlers(ChannelPipeline pipeline) {
                    pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024, 0, 2, 2, 0));
                    pipeline.addLast("objectDecoder", new RuptelaProtocolDecoder(dataManager, protocol, properties));
                }
            });
        }
    }

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    private void initKhdServer(final String protocol) throws SQLException {
        if (isProtocolEnabled(properties, protocol)) {
            serverList.add(new TrackerServer(this, new ServerBootstrap(), protocol) {
                @Override
                protected void addSpecificHandlers(ChannelPipeline pipeline) {
                    pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(256, 3, 2));
                    pipeline.addLast("objectDecoder", new KhdProtocolDecoder(dataManager, protocol, properties));
                }
            });
        }
    }

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    private void initEelinkServer(final String protocol) throws SQLException {
        if (isProtocolEnabled(properties, protocol)) {
            serverList.add(new TrackerServer(this, new ServerBootstrap(), protocol) {
                @Override
                protected void addSpecificHandlers(ChannelPipeline pipeline) {
                    pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024, 3, 2));
                    pipeline.addLast("objectDecoder", new EelinkProtocolDecoder(dataManager, protocol, properties));
                }
            });
        }
    }

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    private void initRitiServer(final String protocol) throws SQLException {
        if (isProtocolEnabled(properties, protocol)) {
            TrackerServer server = new TrackerServer(this, new ServerBootstrap(), protocol) {
                @Override
                protected void addSpecificHandlers(ChannelPipeline pipeline) {
                    pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024, 105, 2, 3, 0));
                    pipeline.addLast("objectDecoder", new RitiProtocolDecoder(dataManager, protocol, properties));
                }
            };
            server.setEndianness(ByteOrder.LITTLE_ENDIAN);
            serverList.add(server);

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                ChannelPipeline cp = Channels.pipeline();
                TimeoutHandler.addToPipeline(cp);
                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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    };
    
    public static void addLengthFieldPipes( ChannelPipeline pipeline )
    {
        pipeline.addLast( "frameDecoder",
                new LengthFieldBasedFrameDecoder( MAX_FRAME_LENGTH+4, 0, 4, 0, 4 ) );
        pipeline.addLast( "frameEncoder", new LengthFieldPrepender( 4 ) );
    }

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        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() {
                ChannelPipeline p = Channels.pipeline();
                p.addLast("decoder", new LengthFieldBasedFrameDecoder(999999, 0, 4, 0, 4));
                p.addLast("executionhandler", new ExecutionHandler(deserializerExecutorFactory.create()));
                p.addLast("receiver", new EventDecoderHandler(receiver));


                return p;
            }

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                ChannelPipeline cp = Channels.pipeline();
                TimeoutHandler.addToPipeline(cp);
                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));

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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    }


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


        p.addLast("frameEncoder", frameEncoder);
        p.addLast("protobufEncoder", encoder);

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