hadoop SimpleTcpClientHandler 源码
haddop SimpleTcpClientHandler 代码
文件路径：/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpClientHandler.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.oncrpc;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A simple TCP based RPC client handler used by {@link SimpleTcpServer}.
*/
public class SimpleTcpClientHandler extends ChannelInboundHandlerAdapter {
public static final Logger LOG =
LoggerFactory.getLogger(SimpleTcpClient.class);
protected final XDR request;
public SimpleTcpClientHandler(XDR request) {
this.request = request;
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// Send the request
if (LOG.isDebugEnabled()) {
LOG.debug("sending PRC request");
}
ByteBuf outBuf = XDR.writeMessageTcp(request, true);
ctx.channel().writeAndFlush(outBuf);
}
/**
* Shutdown connection by default. Subclass can override this method to do
* more interaction with the server.
*/
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ctx.channel().close();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
LOG.warn("Unexpected exception from downstream: ", cause.getCause());
ctx.channel().close();
}
}
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