mirror of https://github.com/sipwise/jitsi.git
Delivers SystemActivity events in different thread and on windows give time to the underlying jvm to dispatch the same message and populate its interfaces.
Damian Minkov
14 years ago
parent
ea647d25f1
commit
78cefa3a27
@ -0,0 +1,235 @@
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/*
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* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package net.java.sip.communicator.impl.sysactivity;
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import net.java.sip.communicator.service.sysactivity.*;
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import net.java.sip.communicator.service.sysactivity.event.*;
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import net.java.sip.communicator.util.*;
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import java.util.*;
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/**
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* The class implements a dispatch event thread. The thread will
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* fire event every time it is added through the <tt>fireSystemActivityEvent()</tt>
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* method and would then deliver it to a registered listener if any.
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* If the event has time set we used it as a delay before dispatching the event.
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* <p>
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* @author Damian Minkov
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*/
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public class SystemActivityEventDispatcher
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implements Runnable
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{
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/**
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* Our class logger.
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*/
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private static Logger logger =
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Logger.getLogger(SystemActivityEventDispatcher.class);
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/**
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* A list of listeners registered for system activity events.
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*/
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private final List<SystemActivityChangeListener> listeners =
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new LinkedList<SystemActivityChangeListener>();
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/**
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* start/stop indicator.
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*/
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private boolean stopped = true;
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/**
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* The thread that runs this dispatcher.
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*/
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private Thread dispatcherThread = null;
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/**
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* The events to dispatch.
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*/
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private Map<SystemActivityEvent, Integer> eventsToDispatch
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= new LinkedHashMap<SystemActivityEvent, Integer>();
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/**
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* Registers a listener that would be notified of changes that have occurred
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* in the underlying system.
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*
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* @param listener the listener that we'd like to register for changes in
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* the underlying system.
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*/
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public void addSystemActivityChangeListener(
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SystemActivityChangeListener listener)
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{
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synchronized(listeners)
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{
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if(!listeners.contains(listener))
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{
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listeners.add(listener);
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if(dispatcherThread == null)
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{
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dispatcherThread = new Thread(this);
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dispatcherThread.start();
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}
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}
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}
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}
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/**
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* Remove the specified listener so that it won't receive further
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* notifications of changes that occur in the underlying system
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*
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* @param listener the listener to remove.
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*/
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public void removeSystemActivityChangeListener(
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SystemActivityChangeListener listener)
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{
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synchronized(listeners)
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{
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listeners.remove(listener);
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}
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}
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/**
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* Interrupts this dispatcher so that it would no longer disptach events.
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*/
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public void stop()
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{
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synchronized(eventsToDispatch)
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{
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stopped = true;
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eventsToDispatch.notifyAll();
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dispatcherThread = null;
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}
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}
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/**
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* Delivers the specified event to all registered listeners.
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*
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* @param evt the <tt>SystemActivityEvent</tt> that we'd like delivered to
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* all registered message listeners.
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*/
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protected void fireSystemActivityEvent(SystemActivityEvent evt)
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{
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fireSystemActivityEvent(evt, 0);
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}
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/**
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* Delivers the specified event to all registered listeners.
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*
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* @param evt the <tt>SystemActivityEvent</tt> that we'd like delivered to
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* all registered message listeners.
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* @param wait time in ms. to wait before firing the event.
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*/
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protected void fireSystemActivityEvent(SystemActivityEvent evt, int wait)
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{
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synchronized(eventsToDispatch)
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{
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eventsToDispatch.put(evt, wait);
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eventsToDispatch.notifyAll();
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if(dispatcherThread == null && listeners.size() > 0)
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{
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dispatcherThread = new Thread(this);
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dispatcherThread.start();
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}
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}
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}
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/**
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* Delivers the specified event to the <tt>listener</tt>.
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*
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* @param evt the <tt>SystemActivityEvent</tt> that we'd like delivered to
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* the listener.
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* @param listener that will receive the event.
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*/
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private void fireSystemActivityEvent(SystemActivityEvent evt,
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SystemActivityChangeListener listener)
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{
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if (logger.isDebugEnabled())
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logger.debug("Dispatching SystemActivityEvent Listeners="
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+ listeners.size() + " evt=" + evt);
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try
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{
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listener.activityChanged(evt);
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}
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catch (Throwable e)
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{
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logger.error("Error delivering event", e);
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}
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}
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/**
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* Runs the waiting thread.
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*/
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public void run()
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{
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try
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{
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stopped = false;
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while(!stopped)
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{
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Map.Entry<SystemActivityEvent, Integer> eventToProcess = null;
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List<SystemActivityChangeListener> listenersCopy;
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synchronized(eventsToDispatch)
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{
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if(eventsToDispatch.size() == 0)
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{
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try {
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eventsToDispatch.wait();
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}
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catch (InterruptedException iex){}
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}
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//no point in dispatching if there's no one
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//listening
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if (listeners.size() == 0)
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continue;
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//store the ref of the listener in case someone resets
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//it before we've had a chance to notify it.
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listenersCopy = new ArrayList
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<SystemActivityChangeListener>(listeners);
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Iterator<Map.Entry<SystemActivityEvent, Integer>> iter =
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eventsToDispatch.entrySet().iterator();
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if(iter.hasNext())
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{
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eventToProcess = iter.next();
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iter.remove();
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}
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}
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if(eventToProcess != null && listenersCopy != null)
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{
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if(eventToProcess.getValue() > 0)
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synchronized(this)
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{
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try{
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wait(eventToProcess.getValue());
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}catch(Throwable t){}
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}
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for (int i = 0; i < listenersCopy.size(); i++)
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{
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fireSystemActivityEvent(
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eventToProcess.getKey(),
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listenersCopy.get(i));
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}
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}
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eventToProcess = null;
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listenersCopy = null;
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}
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} catch(Throwable t)
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{
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logger.error("Error dispatching thread ended unexpectedly", t);
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}
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}
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}
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