Example usage for io.netty.handler.codec MessageToMessageCodec MessageToMessageCodec

Introduction

In this page you can find the example usage for io.netty.handler.codec MessageToMessageCodec MessageToMessageCodec.

Prototype

protected MessageToMessageCodec() 

Source Link

Document

Create a new instance which will try to detect the types to decode and encode out of the type parameter of the class.

Usage

From source file:org.ethereum.net.NettyTest.java

License:Open Source License

@Test
public void pipelineTest() {

    final int[] int2 = new int[1];
    final boolean[] exception = new boolean[1];

    final ByteToMessageDecoder decoder2 = new ByteToMessageDecoder() {
        @Override/*from  w ww . j ava  2 s  . c  om*/
        protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
            int i = in.readInt();
            System.out.println("decoder2 read int (4 bytes): " + Integer.toHexString(i));
            int2[0] = i;
            if (i == 0)
                out.add("aaa");
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            System.out.println("Decoder2 exception: " + cause);
        }
    };

    final MessageToMessageCodec decoder3 = new MessageToMessageCodec<Object, Object>() {
        @Override
        protected void decode(ChannelHandlerContext ctx, Object msg, List<Object> out) throws Exception {
            System.out.println("NettyTest.decode: msg = [" + msg + "]");
            if (msg == "aaa") {
                throw new RuntimeException("Test exception 3");
            }
        }

        @Override
        protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out) throws Exception {
            throw new RuntimeException("Test exception 4");
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            System.out.println("Decoder3 exception: " + cause);
            exception[0] = true;
        }
    };

    final ByteToMessageDecoder decoder1 = new ByteToMessageDecoder() {
        @Override
        protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
            int i = in.readInt();
            System.out.println("decoder1 read int (4 bytes). Needs no more: " + Integer.toHexString(i));
            ctx.pipeline().addAfter("decoder1", "decoder2", decoder2);
            ctx.pipeline().addAfter("decoder2", "decoder3", decoder3);
            ctx.pipeline().remove(this);
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            System.out.println("Decoder1 exception: " + cause);
        }
    };

    ChannelInboundHandlerAdapter initiator = new ChannelInboundHandlerAdapter() {
        @Override
        public void channelActive(ChannelHandlerContext ctx) throws Exception {
            ctx.pipeline().addFirst("decoder1", decoder1);
            System.out.println("NettyTest.channelActive");
        }
    };

    EmbeddedChannel channel0 = new EmbeddedChannel(new ChannelOutboundHandlerAdapter() {
        @Override
        public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
            throw new RuntimeException("Test");
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            System.out.println("Exception caught: " + cause);
        }

    });
    EmbeddedChannel channel = new EmbeddedChannel(initiator);
    ByteBuf buffer = Unpooled.buffer();
    buffer.writeInt(0x12345678);
    buffer.writeInt(0xabcdefff);
    channel.writeInbound(buffer);
    Assert.assertEquals(0xabcdefff, int2[0]);

    channel.writeInbound(Unpooled.buffer().writeInt(0));
    Assert.assertTrue(exception[0]);

    // Need the following for the exception in outbound handler to be fired
    // ctx.writeAndFlush(msg).addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);

    //        exception[0] = false;
    //        channel.writeOutbound("outMsg");
    //        Assert.assertTrue(exception[0]);
}

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