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/*
* 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.spark.network.netty;
import java.net.InetSocketAddress;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.oio.OioEventLoopGroup;
import io.netty.channel.socket.oio.OioServerSocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Server that accept the path of a file an echo back its content.
*/
class FileServer {
private Logger LOG = LoggerFactory.getLogger(this.getClass().getName());
private EventLoopGroup bossGroup = null;
private EventLoopGroup workerGroup = null;
private ChannelFuture channelFuture = null;
private int port = 0;
private Thread blockingThread = null;
public FileServer(PathResolver pResolver, int port) {
InetSocketAddress addr = new InetSocketAddress(port);
// Configure the server.
bossGroup = new OioEventLoopGroup();
workerGroup = new OioEventLoopGroup();
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(bossGroup, workerGroup)
.channel(OioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 100)
.option(ChannelOption.SO_RCVBUF, 1500)
.childHandler(new FileServerChannelInitializer(pResolver));
// Start the server.
channelFuture = bootstrap.bind(addr);
try {
// Get the address we bound to.
InetSocketAddress boundAddress =
((InetSocketAddress) channelFuture.sync().channel().localAddress());
this.port = boundAddress.getPort();
} catch (InterruptedException ie) {
this.port = 0;
}
}
/**
* Start the file server asynchronously in a new thread.
*/
public void start() {
blockingThread = new Thread() {
public void run() {
try {
channelFuture.channel().closeFuture().sync();
LOG.info("FileServer exiting");
} catch (InterruptedException e) {
LOG.error("File server start got interrupted", e);
}
// NOTE: bootstrap is shutdown in stop()
}
};
blockingThread.setDaemon(true);
blockingThread.start();
}
public int getPort() {
return port;
}
public void stop() {
// Close the bound channel.
if (channelFuture != null) {
channelFuture.channel().close().awaitUninterruptibly();
channelFuture = null;
}
// Shutdown event groups
if (bossGroup != null) {
bossGroup.shutdownGracefully();
bossGroup = null;
}
if (workerGroup != null) {
workerGroup.shutdownGracefully();
workerGroup = null;
}
// TODO: Shutdown all accepted channels as well ?
}
}
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