/*
*
* 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.qpid.proton.driver.impl;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Queue;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.qpid.proton.driver.Connector;
import org.apache.qpid.proton.driver.Driver;
import org.apache.qpid.proton.driver.Listener;
public class DriverImpl implements Driver
{
private Selector _selector;
private Collection<Listener> _listeners = new LinkedList();
private Collection<Connector> _connectors = new LinkedList();
private Logger _logger = Logger.getLogger("proton.driver");
private Object _wakeupLock = new Object();
private boolean _woken = false;
private Queue<ConnectorImpl> _selectedConnectors = new ArrayDeque<ConnectorImpl>();
private Queue<ListenerImpl> _selectedListeners = new ArrayDeque<ListenerImpl>();
DriverImpl() throws IOException
{
_selector = Selector.open();
}
public void wakeup()
{
synchronized (_wakeupLock) {
_woken = true;
}
_selector.wakeup();
}
public boolean doWait(long timeout)
{
try
{
boolean woken;
synchronized (_wakeupLock) {
woken = _woken;
}
if (woken || timeout == 0) {
_selector.selectNow();
} else if (timeout < 0) {
_selector.select(0);
} else {
_selector.select(timeout);
}
synchronized (_wakeupLock) {
woken = woken || _woken;
_woken = false;
}
for (SelectionKey key : _selector.selectedKeys()) {
if (key.isAcceptable()) {
ListenerImpl l = (ListenerImpl) key.attachment();
l.selected();
} else {
ConnectorImpl c = (ConnectorImpl) key.attachment();
c.selected();
}
}
_selector.selectedKeys().clear();
return woken;
}
catch (IOException e)
{
_logger.log(Level.SEVERE, "Exception when waiting for IO Event",e);
throw new RuntimeException(e);
}
}
void selectListener(ListenerImpl l)
{
_selectedListeners.add(l);
}
public Listener listener()
{
ListenerImpl listener = _selectedListeners.poll();
if (listener != null) {
listener.unselected();
}
return listener;
}
void selectConnector(ConnectorImpl c)
{
_selectedConnectors.add(c);
}
public Connector connector()
{
ConnectorImpl connector = _selectedConnectors.poll();
if (connector != null) {
connector.unselected();
}
return connector;
}
public void destroy()
{
try
{
_selector.close();
}
catch (IOException e)
{
_logger.log(Level.SEVERE, "Exception when closing selector",e);
throw new RuntimeException(e);
}
_listeners.clear();
_connectors.clear();
}
public <C> Listener<C> createListener(String host, int port, C context)
{
try
{
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.configureBlocking(false);
ServerSocket serverSocket = serverSocketChannel.socket();
serverSocket.bind(new InetSocketAddress(host, port));
Listener<C> listener = createListener(serverSocketChannel, context);
_logger.fine("Created listener on " + host + ":" + port + ": " + context);
return listener;
}
catch (ClosedChannelException e)
{
e.printStackTrace(); // TODO - Implement
}
catch (IOException e)
{
e.printStackTrace(); // TODO - Implement
}
return null;
}
public <C> Listener<C> createListener(ServerSocketChannel c, C context)
{
Listener<C> l = new ListenerImpl<C>(this, c, context);
SelectionKey key = registerInterest(c,SelectionKey.OP_ACCEPT);
key.attach(l);
_listeners.add(l);
return l;
}
public <C> Connector<C> createConnector(String host, int port, C context)
{
try
{
SocketChannel channel = SocketChannel.open();
channel.configureBlocking(false);
channel.connect(new InetSocketAddress(host, port));
return createConnector(channel, context);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException(e);
}
}
public <C> Connector<C> createConnector(SelectableChannel c, C context)
{
SelectionKey key = registerInterest(c, SelectionKey.OP_READ | SelectionKey.OP_WRITE);
Connector<C> co = new ConnectorImpl<C>(this, null, (SocketChannel)c, context, key);
key.attach(co);
_connectors.add(co);
return co;
}
public <C> void removeConnector(Connector<C> c)
{
_connectors.remove(c);
}
public Iterable<Listener> listeners()
{
return _listeners;
}
public Iterable<Connector> connectors()
{
return _connectors;
}
protected <C> Connector<C> createServerConnector(SelectableChannel c, C context, Listener<C> l)
{
SelectionKey key = registerInterest(c, SelectionKey.OP_READ | SelectionKey.OP_WRITE);
Connector<C> co = new ConnectorImpl<C>(this, l, (SocketChannel)c, context, key);
key.attach(co);
_connectors.add(co);
return co;
}
private <C> SelectionKey registerInterest(SelectableChannel c, int opKeys)
{
try
{
return c.register(_selector, opKeys);
}
catch (ClosedChannelException e)
{
e.printStackTrace(); // TODO - Implement
throw new RuntimeException(e);
}
}
}