10 - EmbeddedChannel-测试ChannelHandler链

方法	职责
writeInbound(Object... msgs)	将入站消息写入到EmbeddedChannel中
readInbound()	从EmbeddedChannel中读取一个入站消息，任何返回的消息都穿过了整个ChannelPipeLine
writeOutbound(Object... msgs)	将出站消息写入到EmbeddedChannel中
readOutbound()	从EmbeddedChannel中读取一个出站消息，任何返回的消息都穿过了整个ChannelPipeLine

10.1 示例

//测试结果
Received message:0
Received Finished!
Received message:1
Received Finished!
Received message:2
Received Finished!
embeddedChannel readInbound:0
embeddedChannel readInbound:1
embeddedChannel readInbound:2

public class EmBeddedChannelTest {
    public static void main(String[] args) {
        ByteBuf byteBuf = Unpooled.buffer();
        for (int i = 0; i < 3; i++) {
            byteBuf.writeInt(i);
        }
        EmbeddedChannel embeddedChannel = new EmbeddedChannel();
		//获取channelPipeLine
        ChannelPipeline channelPipeline = embeddedChannel.pipeline();
        channelPipeline.addLast(new SimpleChannelInBoundHandlerTest());
        channelPipeline.addFirst(new DecodeTest());
		//写入测试数据
        embeddedChannel.writeInbound(byteBuf);
        System.out.println("embeddedChannel readInbound:"+embeddedChannel.readInbound());
        System.out.println("embeddedChannel readInbound:"+embeddedChannel.readInbound());
        System.out.println("embeddedChannel readInbound:"+embeddedChannel.readInbound());
    }
}
//解码器
class DecodeTest extends ByteToMessageDecoder {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        if( in.readableBytes()>=4 ){
            out.add(in.readInt());
        }
    }
}
//channelHandler
class  SimpleChannelInBoundHandlerTest extends SimpleChannelInboundHandler {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
        System.out.println("Received message:"+msg);
        System.out.println("Received Finished!");
        ctx.fireChannelRead(msg);
    }
}