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/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the BSD license.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*************************************************************************/
// __________ Imports __________
import java.util.*;
// __________ Implementation __________
/**
* It's implement a static container which hold
* all opened documents and her views alive.
* It's possible to register/deregister such views,
* to get information about these and it provides
* some global functionality - like termination of
* this demo application.
*
*/
public class ViewContainer extends Thread
{
/**
* provides a singleton view container
* Necessary for terminate(9 functionality to be able
* to call Runtime.runFinilization().
*
* @return a reference to the singleton ViewContainer instance
*/
public static synchronized ViewContainer getGlobalContainer()
{
if (maSingleton==null)
maSingleton=new ViewContainer();
return maSingleton;
}
/**
* ctor
* It's private - because nobody should create any instance
* expect the only global one, which wil be created by ourself!
*/
private ViewContainer()
{
mlViews = new ArrayList<Object>();
mlListener = new ArrayList<IShutdownListener>();
mbShutdownActive = false ;
Runtime.getRuntime().addShutdownHook(this);
}
/**
* This register a new view inside this global container
* (if it doesn't already exist).
*
* @param aView view which wish to be registered inside this container
*/
public void addView(Object aView)
{
synchronized(mlViews)
{
if(!mlViews.contains(aView))
mlViews.add(aView);
}
}
/**
* This deregister a view from this global container.
* Normally it should be the last reference to the view
* and her finalize() method should be called.
* If last view will be closed here - we terminate these
* java application too. Because there is no further
* visible frame anymore.
*
* @param aView
* view object which wish to be deregistered
*/
public void removeView(Object aView)
{
int nViewCount = 0;
synchronized(mlViews)
{
if(mlViews.contains(aView))
mlViews.remove(aView);
nViewCount = mlViews.size();
if (nViewCount<1)
mlViews = null;
}
// If this view is a registered shutdown listener on this view container
// too, we must call his interface and forget him as possible listener.
// It's necessary to guarantee his dead ...
boolean bShutdownView = false;
synchronized(mlListener)
{
bShutdownView = mlListener.contains(aView);
if (bShutdownView)
mlListener.remove(aView);
}
if (bShutdownView)
((IShutdownListener)aView).shutdown();
// We use a system.exit() to finish the whole application.
// And further we have registered THIS instance as a possible shutdown
// hook at the runtime class. So our run() method will be called.
// Our view container should be empty - but
// our listener container can include some references.
// These objects will be informed then and release e.g. some
// remote references.
if (nViewCount<1)
{
boolean bNecessary = false;
synchronized(this)
{
bNecessary = ! mbShutdownActive;
}
if (bNecessary)
{
System.out.println("call exit(0)!");
System.exit(0);
}
}
}
/**
* add/remove listener for possibe shutdown events
*/
public void addListener( IShutdownListener rListener )
{
synchronized(mlListener)
{
if ( ! mlListener.contains(rListener) )
mlListener.add(rListener);
}
}
private void removeListener( IShutdownListener rListener )
{
synchronized(mlListener)
{
if ( mlListener.contains(rListener) )
mlListener.remove(rListener);
}
}
/**
* Is called from current runtime system of the java machine
* on shutdown. We inform all current registered listener and
* views. They should deinitialize her internal things then.
*/
@Override
public void run()
{
synchronized(this)
{
if (mbShutdownActive)
return;
mbShutdownActive=true;
}
while( true )
{
IShutdownListener aListener = null;
synchronized(mlListener)
{
if (!mlListener.isEmpty())
aListener = mlListener.get(0);
}
if (aListener==null)
break;
aListener.shutdown();
// May this listener has deregistered himself.
// But if not we must do it for him. Our own
// method "removeListener()" ignore requests for
// already gone listener objects.
removeListener(aListener);
}
if (mlViews!=null)
{
synchronized(mlViews)
{
mlViews.clear();
mlViews = null;
}
}
if (mlListener!=null)
{
synchronized(mlListener)
{
mlListener.clear();
mlListener = null;
}
}
}
/**
* @member mbInplace indicates using of inplace office frames instead of outplace ones
* @member maSingleton singleton instance of this view container
* @member mlViews list of all currently registered document views
* @member mlListener list of all currently registered shutdown listener
* @member mbShutdownActive if this shutdown hook already was started it's not a good idea to
* call System.exit() again for other conditions.
* We suppress it by using this variable!
*/
public static boolean mbInplace = false ;
private static ViewContainer maSingleton = null ;
private ArrayList<Object> mlViews ;
private ArrayList<IShutdownListener> mlListener ;
private boolean mbShutdownActive ;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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