/*
* 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.accumulo.server.util;
import org.apache.log4j.Logger;
import org.apache.thrift.transport.TNonblockingServerTransport;
import org.apache.thrift.transport.TNonblockingSocket;
import org.apache.thrift.transport.TTransportException;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
/**
* Wrapper around ServerSocketChannel.
*
* This class is copied from org.apache.thrift.transport.TNonblockingServerSocket version 0.9.
* The only change (apart from the logging statements) is the addition of the {@link #getPort()} method to retrieve the port used by the ServerSocket.
*/
public class TNonblockingServerSocket extends TNonblockingServerTransport {
private static final Logger log = Logger.getLogger(TNonblockingServerTransport.class.getName());
/**
* This channel is where all the nonblocking magic happens.
*/
private ServerSocketChannel serverSocketChannel = null;
/**
* Underlying ServerSocket object
*/
private ServerSocket serverSocket_ = null;
/**
* Timeout for client sockets from accept
*/
private int clientTimeout_ = 0;
/**
* Creates just a port listening server socket
*/
public TNonblockingServerSocket(int port) throws TTransportException {
this(port, 0);
}
/**
* Creates just a port listening server socket
*/
public TNonblockingServerSocket(int port, int clientTimeout) throws TTransportException {
this(new InetSocketAddress(port), clientTimeout);
}
public TNonblockingServerSocket(InetSocketAddress bindAddr) throws TTransportException {
this(bindAddr, 0);
}
public TNonblockingServerSocket(InetSocketAddress bindAddr, int clientTimeout) throws TTransportException {
clientTimeout_ = clientTimeout;
try {
serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.configureBlocking(false);
// Make server socket
serverSocket_ = serverSocketChannel.socket();
// Prevent 2MSL delay problem on server restarts
serverSocket_.setReuseAddress(true);
// Bind to listening port
serverSocket_.bind(bindAddr);
} catch (IOException ioe) {
serverSocket_ = null;
throw new TTransportException("Could not create ServerSocket on address " + bindAddr.toString() + ".");
}
}
public void listen() throws TTransportException {
// Make sure not to block on accept
if (serverSocket_ != null) {
try {
serverSocket_.setSoTimeout(0);
} catch (SocketException sx) {
sx.printStackTrace();
}
}
}
protected TNonblockingSocket acceptImpl() throws TTransportException {
if (serverSocket_ == null) {
throw new TTransportException(TTransportException.NOT_OPEN, "No underlying server socket.");
}
try {
SocketChannel socketChannel = serverSocketChannel.accept();
if (socketChannel == null) {
return null;
}
TNonblockingSocket tsocket = new TNonblockingSocket(socketChannel);
tsocket.setTimeout(clientTimeout_);
return tsocket;
} catch (IOException iox) {
throw new TTransportException(iox);
}
}
public void registerSelector(Selector selector) {
try {
// Register the server socket channel, indicating an interest in
// accepting new connections
serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
} catch (ClosedChannelException e) {
// this shouldn't happen, ideally...
// TODO: decide what to do with this.
}
}
public void close() {
if (serverSocket_ != null) {
try {
serverSocket_.close();
} catch (IOException iox) {
log.warn("WARNING: Could not close server socket: " + iox.getMessage());
}
serverSocket_ = null;
}
}
public void interrupt() {
// The thread-safeness of this is dubious, but Java documentation suggests
// that it is safe to do this from a different thread context
close();
}
public int getPort() {
return serverSocket_.getLocalPort();
}
}