Example usage for io.netty.channel ChannelPipeline first

Introduction

In this page you can find the example usage for io.netty.channel ChannelPipeline first.

Prototype

ChannelHandler first();

Source Link

Document

Returns the first ChannelHandler in this pipeline.

Usage

From source file:org.apache.hadoop.hbase.util.FanOutOneBlockAsyncDFSOutputHelper.java

License:Apache License

private static void processWriteBlockResponse(Channel channel, final DatanodeInfo dnInfo,
        final Promise<Channel> promise, final int timeoutMs) {
    channel.pipeline().addLast(new IdleStateHandler(timeoutMs, 0, 0, TimeUnit.MILLISECONDS),
            new ProtobufVarint32FrameDecoder(), new ProtobufDecoder(BlockOpResponseProto.getDefaultInstance()),
            new SimpleChannelInboundHandler<BlockOpResponseProto>() {

                @Override/*from  w ww .  j  a v  a2  s .com*/
                protected void channelRead0(ChannelHandlerContext ctx, BlockOpResponseProto resp)
                        throws Exception {
                    Status pipelineStatus = resp.getStatus();
                    if (PipelineAck.isRestartOOBStatus(pipelineStatus)) {
                        throw new IOException("datanode " + dnInfo + " is restarting");
                    }
                    String logInfo = "ack with firstBadLink as " + resp.getFirstBadLink();
                    if (resp.getStatus() != Status.SUCCESS) {
                        if (resp.getStatus() == Status.ERROR_ACCESS_TOKEN) {
                            throw new InvalidBlockTokenException("Got access token error" + ", status message "
                                    + resp.getMessage() + ", " + logInfo);
                        } else {
                            throw new IOException("Got error" + ", status=" + resp.getStatus().name()
                                    + ", status message " + resp.getMessage() + ", " + logInfo);
                        }
                    }
                    // success
                    ChannelPipeline p = ctx.pipeline();
                    while (p.first() != null) {
                        p.removeFirst();
                    }
                    // Disable auto read here. Enable it after we setup the streaming pipeline in
                    // FanOutOneBLockAsyncDFSOutput.
                    ctx.channel().config().setAutoRead(false);
                    promise.trySuccess(ctx.channel());
                }

                @Override
                public void channelInactive(ChannelHandlerContext ctx) throws Exception {
                    promise.tryFailure(new IOException("connection to " + dnInfo + " is closed"));
                }

                @Override
                public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
                    if (evt instanceof IdleStateEvent
                            && ((IdleStateEvent) evt).state() == IdleState.READER_IDLE) {
                        promise.tryFailure(
                                new IOException("Timeout(" + timeoutMs + "ms) waiting for response"));
                    } else {
                        super.userEventTriggered(ctx, evt);
                    }
                }

                @Override
                public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                    promise.tryFailure(cause);
                }
            });
}

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