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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.plugin.windowscleanshutdown;
import net.java.sip.communicator.service.shutdown.*;
import net.java.sip.communicator.service.sysactivity.*;
import net.java.sip.communicator.service.sysactivity.event.*;
import net.java.sip.communicator.util.*;
import org.osgi.framework.*;
import java.util.concurrent.*;
/**
* Tries to cleanly close the application on shutdown/logoff. The events used
* here are only available on windows.
*
* If the application is still running once end session event is received
* and we have give it time (currently 3 sec.) we System.exit() the application.
*
* @author Emil Ivov
*/
public class CleanShutdownActivator
implements BundleActivator, ServiceListener
{
private static final Logger logger
= Logger.getLogger(CleanShutdownActivator.class);
/**
* Used to wait for stop.
*/
final CountDownLatch synchShutdown = new CountDownLatch(1);
/**
* Our context.
*/
private BundleContext context;
/**
* The system activity service.
*/
SystemActivityNotificationsService sysActivityService = null;
/**
* Bundle activator start method.
*
* @throws Exception If this method throws an exception
* (which won't happen).
*/
public void start(final BundleContext context)
throws Exception
{
this.context = context;
logger.info("Starting the CleanShutdown service.");
handleNewSystemActivityNotificationsService(
getSystemActivityNotificationsService(context));
// if missing will wait for it
if(sysActivityService == null)
context.addServiceListener(this);
}
/**
* Called when this bundle is stopped so the Framework can perform the
* bundle-specific activities necessary to stop the bundle.
*
* @param context The execution context of the bundle being stopped.
* @throws Exception If this method throws an exception, the bundle is
* still marked as stopped, and the Framework will remove the bundle's
* listeners, unregister all services registered by the bundle, and
* release all services used by the bundle.
*/
public void stop(BundleContext context)
throws Exception
{
// stop received.
synchShutdown.countDown();
}
/**
* Gets a reference to a <code>ShutdownService</code> implementation
* currently registered in the bundle context of the active
* <code>OsDependentActivator</code> instance.
* <p>
* The returned reference to <code>ShutdownService</code> is not being
* cached.
* </p>
*
* @return reference to a <code>ShutdownService</code> implementation
* currently registered in the bundle context of the active
* <code>OsDependentActivator</code> instance
*/
private ShutdownService getShutdownService()
{
return(ShutdownService)context.getService(
context.getServiceReference(ShutdownService.class.getName()));
}
/**
* Gets a reference to a <code>SystemActivityNotificationsService</code>
* implementation currently registered in the bundle context.
* <p>
* The returned reference to <code>SystemActivityNotificationsService</code>
* is not being cached.
* </p>
*
* @param context the bundle context.
* @return reference to a <code>SystemActivityNotificationsService</code>
* implementation currently registered in the bundle context.
*/
public static SystemActivityNotificationsService
getSystemActivityNotificationsService(BundleContext context)
{
ServiceReference ref =
context.getServiceReference(
SystemActivityNotificationsService.class.getName());
if(ref == null)
return null;
else
return
(SystemActivityNotificationsService)
context.getService(ref);
}
/**
* Saves the reference for the service and
* add a listener if the desired events are supported. Or start
* the checking thread otherwise.
* @param newService the service
*/
private void handleNewSystemActivityNotificationsService
(SystemActivityNotificationsService newService)
{
sysActivityService = newService;
if(newService != null)
newService.addSystemActivityChangeListener(
new SystemActivityChangeListener()
{
public void activityChanged(SystemActivityEvent event)
{
if(event.getEventID()
== SystemActivityEvent.EVENT_QUERY_ENDSESSION)
{
// instruct the shutdown timeout to
// wait only 3 secs.
System.setProperty(
"org.jitsi.shutdown.SHUTDOWN_TIMEOUT",
"3000");
getShutdownService().beginShutdown();
// just wait a moment, or till we are stopped
try
{
synchronized(this)
{
synchShutdown.await(1500,
TimeUnit.MILLISECONDS);
}
}
catch(Throwable t)
{}
}
else if(event.getEventID()
== SystemActivityEvent.EVENT_ENDSESSION)
{
try
{
// wait till we are stopped or forced stopped
synchShutdown.await();
}
catch(Throwable t)
{}
}
}
});
}
/**
* When new SystemActivityNotificationsService
* is registered we add needed listeners.
*
* @param serviceEvent ServiceEvent
*/
public void serviceChanged(ServiceEvent serviceEvent)
{
ServiceReference serviceRef = serviceEvent.getServiceReference();
// if the event is caused by a bundle being stopped, we don't want to
// know we are shutting down
if (serviceRef.getBundle().getState() == Bundle.STOPPING)
{
return;
}
Object sService = context
.getService(serviceRef);
if(sService instanceof SystemActivityNotificationsService)
{
switch (serviceEvent.getType())
{
case ServiceEvent.REGISTERED:
handleNewSystemActivityNotificationsService(
(SystemActivityNotificationsService)sService);
break;
case ServiceEvent.UNREGISTERING:
//((SystemActivityNotificationsService)sService)
// .removeSystemActivityChangeListener(this);
break;
}
return;
}
}
}
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