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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package net.java.sip.communicator.impl.netaddr;
import java.util.*;
import net.java.sip.communicator.service.netaddr.event.*;
import net.java.sip.communicator.util.*;
/**
* The class implements a dispatch event thread. The thread will
* fire event every time it is added through the <tt>fireChangeEvent()</tt>
* method and would then deliver it to a registered listener if any.
* (No fire would be performed until we have a
* <tt>NetworkConfigurationChangeListener</tt>). If the event has time set
* we used it as a delay before dispatching the event.
* <p>
*
* @author Damian Minkov
*/
public class NetworkEventDispatcher
implements Runnable
{
/**
* Our class logger.
*/
private static Logger logger =
Logger.getLogger(NetworkEventDispatcher.class);
/**
* Listeners for network configuration changes.
*/
private final List<NetworkConfigurationChangeListener> listeners =
new ArrayList<NetworkConfigurationChangeListener>();
/**
* The events to dispatch.
*/
private Map<ChangeEvent, Integer> eventsToDispatch
= new LinkedHashMap<ChangeEvent, Integer>();
/**
* start/stop indicator.
*/
private boolean stopped = true;
/**
* The thread that runs this dispatcher.
*/
private Thread dispatcherThread = null;
/**
* Adds new <tt>NetworkConfigurationChangeListener</tt> which will
* be informed for network configuration changes.
* @param listener the listener.
*/
void addNetworkConfigurationChangeListener(
NetworkConfigurationChangeListener listener)
{
synchronized(listeners)
{
if(!listeners.contains(listener))
{
listeners.add(listener);
if(dispatcherThread == null)
{
dispatcherThread = new Thread(this);
dispatcherThread.start();
}
}
}
}
/**
* Remove <tt>NetworkConfigurationChangeListener</tt>.
* @param listener the listener.
*/
void removeNetworkConfigurationChangeListener(
NetworkConfigurationChangeListener listener)
{
synchronized(listeners)
{
listeners.remove(listener);
}
}
/**
* Fire ChangeEvent.
* @param evt the event to fire.
*/
protected void fireChangeEvent(ChangeEvent evt)
{
this.fireChangeEvent(evt, 0);
}
/**
* Fire ChangeEvent.
* @param evt the event to fire.
*/
protected void fireChangeEvent(ChangeEvent evt, int wait)
{
synchronized(eventsToDispatch)
{
eventsToDispatch.put(evt, wait);
eventsToDispatch.notifyAll();
if(dispatcherThread == null && listeners.size() > 0)
{
dispatcherThread = new Thread(this);
dispatcherThread.start();
}
}
}
/**
* Fire ChangeEvent.
* @param evt the event to fire.
*/
static void fireChangeEvent(ChangeEvent evt,
NetworkConfigurationChangeListener listener)
{
try
{
if(logger.isTraceEnabled())
logger.trace("firing event to " + listener + " evt=" + evt);
listener.configurationChanged(evt);
} catch (Throwable e)
{
logger.warn("Error delivering event:" + evt + ", to:" + listener);
}
}
/**
* Runs the waiting thread.
*/
public void run()
{
try
{
stopped = false;
while(!stopped)
{
Map.Entry<ChangeEvent, Integer> eventToProcess = null;
List<NetworkConfigurationChangeListener> listenersCopy;
synchronized(eventsToDispatch)
{
if(eventsToDispatch.size() == 0)
{
try {
eventsToDispatch.wait();
}
catch (InterruptedException iex){}
}
//no point in dispatching if there's no one
//listening
if (listeners.size() == 0)
continue;
//store the ref of the listener in case someone resets
//it before we've had a chance to notify it.
listenersCopy = new ArrayList
<NetworkConfigurationChangeListener>(listeners);
Iterator<Map.Entry<ChangeEvent, Integer>> iter =
eventsToDispatch.entrySet().iterator();
if(iter.hasNext())
{
eventToProcess = iter.next();
iter.remove();
}
}
if(eventToProcess != null && listenersCopy != null)
{
if(eventToProcess.getValue() > 0)
synchronized(this)
{
try{
wait(eventToProcess.getValue());
}catch(Throwable t){}
}
for (int i = 0; i < listenersCopy.size(); i++)
{
fireChangeEvent(eventToProcess.getKey(),
listenersCopy.get(i));
}
}
eventToProcess = null;
listenersCopy = null;
}
} catch(Throwable t)
{
logger.error("Error dispatching thread ended unexpectedly", t);
}
}
/**
* Interrupts this dispatcher so that it would no longer disptach events.
*/
public void stop()
{
synchronized(eventsToDispatch)
{
stopped = true;
eventsToDispatch.notifyAll();
dispatcherThread = null;
}
}
/**
* Returns <tt>true</tt> if this dispatcher is currently running and
* delivering events when available and <tt>false</tt>
* otherwise.
*
* @return <tt>true</tt> if this dispatcher is currently running and
* delivering events when available and <tt>false</tt>
* otherwise.
*/
public boolean isRunning()
{
return !stopped;
}
}
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