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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* 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 net.java.sip.communicator.plugin.desktoputil;
import java.awt.*;
import java.awt.event.*;
/**
* The <tt>LowPriorityEventQueue</tt> schedules low priority events to be
* dispatched through the system event queue.
*
* @author Yana Stamcheva
* @author Lyubomir Marinov
*/
public class LowPriorityEventQueue
{
/**
* Initializes a new <tt>Runnable</tt> which allows the repetitive execution
* the specific <tt>runnable</tt> on the application's <tt>EventQueue</tt>
* instance.
*
* @param runnable the <tt>Runnable</tt> which is to be repetitively
* executed on the application's <tt>EventQueue</tt> instance
* @return a new <tt>Runnable</tt> which allows the repetitive execution of
* the specified <tt>runnable</tT> on the application's <tt>EventQueue</tt>
* instance
*/
public static Runnable createRepetitiveInvokeLater(final Runnable runnable)
{
return
new Runnable()
{
/**
* The <tt>AWTEvent</tt> instance which is to execute the
* specified <tt>runnable</tt> on {@link #eventQueue} i.e. the
* application's <tt>EventQueue</tt> instance.
*/
private AWTEvent event;
/**
* The <tt>EventQueue</tt> instance on which {@link #event} is
* to execute the specified <tt>runnable</tt> i.e. the
* application's <tt>EventQueue</tt> instance.
*/
private EventQueue eventQueue;
/**
* The indicator which determines whether the execution of the
* specified <tt>runnable</tt> has already been scheduled and
* has not been performed yet. If <tt>true</tt>, invocations to
* {@link #run()} will do nothing.
*/
private boolean posted = false;
/**
* Schedules the specified <tt>runnable</tt> to be executed
* (unless the execution has already been scheduled and has not
* been performed yet).
*/
public synchronized void run()
{
if (posted)
return;
if (event == null)
{
Toolkit defaultToolkit = Toolkit.getDefaultToolkit();
eventQueue = defaultToolkit.getSystemEventQueue();
event
= new LowPriorityInvocationEvent(
defaultToolkit,
new Runnable()
{
public void run()
{
runInEvent();
}
});
}
eventQueue.postEvent(event);
posted = true;
}
/**
* Runs during the dispatch of {@link #event} and executed the
* specified <tt>runnable</tt>.
*/
private void runInEvent()
{
synchronized (this)
{
posted = false;
}
runnable.run();
}
};
}
/**
* Causes <tt>runnable</tt> to have its <tt>run</tt> method called in the
* event dispatch thread with low priority.
*
* @param runnable the <tt>Runnable</tt> whose <tt>run</tt> method should be
* executed synchronously on the <tt>EventQueue</tt>
*/
public static void invokeLater(Runnable runnable)
{
Toolkit defaultToolkit = Toolkit.getDefaultToolkit();
defaultToolkit.getSystemEventQueue().postEvent(
new LowPriorityInvocationEvent(defaultToolkit, runnable));
}
/**
* The <tt>LowPriorityInvocationEvent</tt> is an <tt>InvocationEvent</tt>
* that replaces the default event id with the <tt>PaintEvent.UPDATE</tt>
* in order to indicate that this event should be dispatched with the same
* priority as an update paint event, which is normally with lower priority
* than other events.
*/
private static class LowPriorityInvocationEvent
extends InvocationEvent
{
/**
* Serial version UID.
*/
private static final long serialVersionUID = 0L;
public LowPriorityInvocationEvent(Object source, Runnable runnable)
{
super(source, PaintEvent.UPDATE, runnable, null, false);
}
}
}
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