/*
* @(#) $Id: SocketConnectorDelegate.java 379044 2006-02-20 07:40:37Z trustin $
*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.support;
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.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
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.BaseIoConnector;
import org.apache.mina.transport.socket.nio.SocketConnectorConfig;
import org.apache.mina.util.Queue;
/**
* {@link IoConnector} for socket transport (TCP/IP).
*
* @author The Apache Directory Project (dev@directory.apache.org)
* @version $Rev: 379044 $, $Date: 2006-02-20 16:40:37 +0900 (Mon, 20 Feb 2006) $
*/
public class SocketConnectorDelegate extends BaseIoConnector
{
private static volatile int nextId = 0;
private final IoConnector wrapper;
private final int id = nextId++;
private final String threadName = "SocketConnector-" + id;
private final IoServiceConfig defaultConfig = new SocketConnectorConfig();
private Selector selector;
private final Queue connectQueue = new Queue();
private final Set managedSessions = Collections.synchronizedSet( new HashSet() );
private Worker worker;
/**
* Creates a new instance.
*/
public SocketConnectorDelegate( IoConnector wrapper )
{
this.wrapper = wrapper;
}
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 ) )
{
SocketSessionImpl session = newSession( ch, handler, config );
success = true;
ConnectFuture future = new ConnectFuture();
future.setSession( session );
return future;
}
success = true;
}
catch( IOException e )
{
return ConnectFuture.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( this )
{
try
{
startupWorker();
}
catch( IOException e )
{
try
{
ch.close();
}
catch( IOException e2 )
{
ExceptionMonitor.getInstance().exceptionCaught( e2 );
}
return ConnectFuture.newFailedFuture( e );
}
synchronized( connectQueue )
{
connectQueue.push( request );
}
selector.wakeup();
}
return request;
}
public IoServiceConfig getDefaultConfig()
{
return defaultConfig;
}
private synchronized void startupWorker() throws IOException
{
if( worker == null )
{
selector = Selector.open();
worker = new Worker();
worker.start();
}
}
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();
SocketSessionImpl session = newSession( ch, entry.handler, entry.config );
entry.setSession( session );
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() );
key.cancel();
}
}
}
private SocketSessionImpl newSession( SocketChannel ch, IoHandler handler, IoServiceConfig config ) throws IOException
{
SocketSessionImpl session = new SocketSessionImpl(
wrapper, managedSessions,
config.getSessionConfig(),
ch, handler, ch.socket().getRemoteSocketAddress() );
try
{
getFilterChainBuilder().buildFilterChain( session.getFilterChain() );
config.getFilterChainBuilder().buildFilterChain( session.getFilterChain() );
( ( SocketFilterChain ) session.getFilterChain() ).sessionCreated( session );
}
catch( Throwable e )
{
throw ( IOException ) new IOException( "Failed to create a session." ).initCause( e );
}
session.getManagedSessions().add( session );
session.getIoProcessor().addNew( session );
return session;
}
private class Worker extends Thread
{
public Worker()
{
super( SocketConnectorDelegate.this.threadName );
}
public void run()
{
for( ;; )
{
try
{
int nKeys = selector.select( 1000 );
registerNew();
if( nKeys > 0 )
{
processSessions( selector.selectedKeys() );
}
processTimedOutSessions( selector.keys() );
if( selector.keys().isEmpty() )
{
synchronized( SocketConnectorDelegate.this )
{
if( selector.keys().isEmpty() &&
connectQueue.isEmpty() )
{
worker = null;
try
{
selector.close();
}
catch( IOException e )
{
ExceptionMonitor.getInstance().exceptionCaught( e );
}
finally
{
selector = null;
}
break;
}
}
}
}
catch( IOException e )
{
ExceptionMonitor.getInstance().exceptionCaught( e );
try
{
Thread.sleep( 1000 );
}
catch( InterruptedException e1 )
{
}
}
}
}
}
private class ConnectionRequest extends ConnectFuture
{
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;
}
}
}