/*
* 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.mina.transport.socket.nio;
import edu.emory.mathcs.backport.java.util.concurrent.Executor;
import org.apache.mina.common.ConnectFuture;
import org.apache.mina.common.ExceptionMonitor;
import org.apache.mina.common.IoConnector;
import org.apache.mina.common.IoConnectorConfig;
import org.apache.mina.common.IoHandler;
import org.apache.mina.common.IoServiceConfig;
import org.apache.mina.common.support.AbstractIoFilterChain;
import org.apache.mina.common.support.DefaultConnectFuture;
import org.apache.mina.util.NamePreservingRunnable;
import org.apache.mina.util.NewThreadExecutor;
import org.apache.mina.util.Queue;
import java.io.IOException;
import java.net.ConnectException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
/**
* {@link IoConnector} for socket transport (TCP/IP).
*
* @author The Apache Directory Project (mina-dev@directory.apache.org)
* @version $Rev: 619823 $, $Date: 2008-02-08 10:09:37 +0000 (Fri, 08 Feb 2008) $
*/
public class MultiThreadSocketConnector extends SocketConnector
{
/** @noinspection StaticNonFinalField */
private static volatile int nextId = 0;
private final Object lock = new Object();
private final int id = nextId++;
private final String threadName = "SocketConnector-" + id;
private final Queue connectQueue = new Queue();
private final MultiThreadSocketIoProcessor[] ioProcessors;
private final int processorCount;
private final Executor executor;
/** @noinspection FieldAccessedSynchronizedAndUnsynchronized */
private Selector selector;
private Worker worker;
private int processorDistributor = 0;
private int workerTimeout = 60; // 1 min.
/** Create a connector with a single processing thread using a NewThreadExecutor */
public MultiThreadSocketConnector()
{
this(1, new NewThreadExecutor());
}
/**
* Create a connector with the desired number of processing threads
*
* @param processorCount Number of processing threads
* @param executor Executor to use for launching threads
*/
public MultiThreadSocketConnector(int processorCount, Executor executor)
{
if (processorCount < 1)
{
throw new IllegalArgumentException("Must have at least one processor");
}
this.executor = executor;
this.processorCount = processorCount;
ioProcessors = new MultiThreadSocketIoProcessor[processorCount];
for (int i = 0; i < processorCount; i++)
{
ioProcessors[i] = new MultiThreadSocketIoProcessor("SocketConnectorIoProcessor-" + id + "." + i, executor);
}
}
/**
* How many seconds to keep the connection thread alive between connection requests
*
* @return Number of seconds to keep connection thread alive
*/
public int getWorkerTimeout()
{
return workerTimeout;
}
/**
* Set how many seconds the connection worker thread should remain alive once idle before terminating itself.
*
* @param workerTimeout Number of seconds to keep thread alive. Must be >=0
*/
public void setWorkerTimeout(int workerTimeout)
{
if (workerTimeout < 0)
{
throw new IllegalArgumentException("Must be >= 0");
}
this.workerTimeout = workerTimeout;
}
public ConnectFuture connect(SocketAddress address, IoHandler handler, IoServiceConfig config)
{
return connect(address, null, handler, config);
}
public ConnectFuture connect(SocketAddress address, SocketAddress localAddress,
IoHandler handler, IoServiceConfig config)
{
if (address == null)
{
throw new NullPointerException("address");
}
if (handler == null)
{
throw new NullPointerException("handler");
}
if (!(address instanceof InetSocketAddress))
{
throw new IllegalArgumentException("Unexpected address type: "
+ address.getClass());
}
if (localAddress != null && !(localAddress instanceof InetSocketAddress))
{
throw new IllegalArgumentException("Unexpected local address type: "
+ localAddress.getClass());
}
if (config == null)
{
config = getDefaultConfig();
}
SocketChannel ch = null;
boolean success = false;
try
{
ch = SocketChannel.open();
ch.socket().setReuseAddress(true);
if (localAddress != null)
{
ch.socket().bind(localAddress);
}
ch.configureBlocking(false);
if (ch.connect(address))
{
DefaultConnectFuture future = new DefaultConnectFuture();
newSession(ch, handler, config, future);
success = true;
return future;
}
success = true;
}
catch (IOException e)
{
return DefaultConnectFuture.newFailedFuture(e);
}
finally
{
if (!success && ch != null)
{
try
{
ch.close();
}
catch (IOException e)
{
ExceptionMonitor.getInstance().exceptionCaught(e);
}
}
}
ConnectionRequest request = new ConnectionRequest(ch, handler, config);
synchronized (lock)
{
try
{
startupWorker();
}
catch (IOException e)
{
try
{
ch.close();
}
catch (IOException e2)
{
ExceptionMonitor.getInstance().exceptionCaught(e2);
}
return DefaultConnectFuture.newFailedFuture(e);
}
}
synchronized (connectQueue)
{
connectQueue.push(request);
}
selector.wakeup();
return request;
}
private synchronized void startupWorker() throws IOException
{
if (worker == null)
{
selector = Selector.open();
worker = new Worker();
executor.execute(new NamePreservingRunnable(worker));
}
}
private void registerNew()
{
if (connectQueue.isEmpty())
{
return;
}
for (; ;)
{
ConnectionRequest req;
synchronized (connectQueue)
{
req = (ConnectionRequest) connectQueue.pop();
}
if (req == null)
{
break;
}
SocketChannel ch = req.channel;
try
{
ch.register(selector, SelectionKey.OP_CONNECT, req);
}
catch (IOException e)
{
req.setException(e);
}
}
}
private void processSessions(Set keys)
{
Iterator it = keys.iterator();
while (it.hasNext())
{
SelectionKey key = (SelectionKey) it.next();
if (!key.isConnectable())
{
continue;
}
SocketChannel ch = (SocketChannel) key.channel();
ConnectionRequest entry = (ConnectionRequest) key.attachment();
boolean success = false;
try
{
ch.finishConnect();
newSession(ch, entry.handler, entry.config, entry);
success = true;
}
catch (Throwable e)
{
entry.setException(e);
}
finally
{
key.cancel();
if (!success)
{
try
{
ch.close();
}
catch (IOException e)
{
ExceptionMonitor.getInstance().exceptionCaught(e);
}
}
}
}
keys.clear();
}
private void processTimedOutSessions(Set keys)
{
long currentTime = System.currentTimeMillis();
Iterator it = keys.iterator();
while (it.hasNext())
{
SelectionKey key = (SelectionKey) it.next();
if (!key.isValid())
{
continue;
}
ConnectionRequest entry = (ConnectionRequest) key.attachment();
if (currentTime >= entry.deadline)
{
entry.setException(new ConnectException());
try
{
key.channel().close();
}
catch (IOException e)
{
ExceptionMonitor.getInstance().exceptionCaught(e);
}
finally
{
key.cancel();
}
}
}
}
private void newSession(SocketChannel ch, IoHandler handler, IoServiceConfig config, ConnectFuture connectFuture)
throws IOException
{
MultiThreadSocketSessionImpl session =
new MultiThreadSocketSessionImpl(this, nextProcessor(), getListeners(),
config, ch, handler, ch.socket().getRemoteSocketAddress());
//new interface
// SocketSessionImpl session = new SocketSessionImpl(
// this, nextProcessor(), getListeners(),
// config, ch, handler, ch.socket().getRemoteSocketAddress() );
try
{
getFilterChainBuilder().buildFilterChain(session.getFilterChain());
config.getFilterChainBuilder().buildFilterChain(session.getFilterChain());
config.getThreadModel().buildFilterChain(session.getFilterChain());
}
catch (Throwable e)
{
throw (IOException) new IOException("Failed to create a session.").initCause(e);
}
// Set the ConnectFuture of the specified session, which will be
// removed and notified by AbstractIoFilterChain eventually.
session.setAttribute( AbstractIoFilterChain.CONNECT_FUTURE, connectFuture );
// Forward the remaining process to the SocketIoProcessor.
session.getIoProcessor().addNew(session);
}
private MultiThreadSocketIoProcessor nextProcessor()
{
return ioProcessors[processorDistributor++ % processorCount];
}
private class Worker implements Runnable
{
private long lastActive = System.currentTimeMillis();
public void run()
{
Thread.currentThread().setName(MultiThreadSocketConnector.this.threadName);
for (; ;)
{
try
{
int nKeys = selector.select(1000);
registerNew();
if (nKeys > 0)
{
processSessions(selector.selectedKeys());
}
processTimedOutSessions(selector.keys());
if (selector.keys().isEmpty())
{
if (System.currentTimeMillis() - lastActive > workerTimeout * 1000L)
{
synchronized (lock)
{
if (selector.keys().isEmpty() &&
connectQueue.isEmpty())
{
worker = null;
try
{
selector.close();
}
catch (IOException e)
{
ExceptionMonitor.getInstance().exceptionCaught(e);
}
finally
{
selector = null;
}
break;
}
}
}
}
else
{
lastActive = System.currentTimeMillis();
}
}
catch (IOException e)
{
ExceptionMonitor.getInstance().exceptionCaught(e);
try
{
Thread.sleep(1000);
}
catch (InterruptedException e1)
{
ExceptionMonitor.getInstance().exceptionCaught(e1);
}
}
}
}
}
private class ConnectionRequest extends DefaultConnectFuture
{
private final SocketChannel channel;
private final long deadline;
private final IoHandler handler;
private final IoServiceConfig config;
private ConnectionRequest(SocketChannel channel, IoHandler handler, IoServiceConfig config)
{
this.channel = channel;
long timeout;
if (config instanceof IoConnectorConfig)
{
timeout = ((IoConnectorConfig) config).getConnectTimeoutMillis();
}
else
{
timeout = ((IoConnectorConfig) getDefaultConfig()).getConnectTimeoutMillis();
}
this.deadline = System.currentTimeMillis() + timeout;
this.handler = handler;
this.config = config;
}
}
}