org/objectweb/proactive/core/util/ThreadStoreImpl.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.core.util;


public class ThreadStoreImpl implements ThreadStore, java.io.Serializable {
    private int counter;
    private boolean defaultOpenState;
    private transient boolean open;

    public ThreadStoreImpl() {
        this(true);
    }

    public ThreadStoreImpl(boolean isOpened) {
        defaultOpenState = isOpened;
        open = defaultOpenState;
    }

    public int threadCount() {
        return counter;
    }

    public synchronized void enter() {
        while (!open) {
            try {
                wait();
            } catch (InterruptedException e) {
            }
        }
        counter++;
    }

    public synchronized void exit() {
        counter--;
        notifyAll();
    }

    public synchronized void close() {
        open = false;
        while ((counter != 0) && !open) {
            try {
                wait();
            } catch (InterruptedException e) {
            }
        }
    }

    public synchronized void open() {
        open = true;
        notifyAll();
    }

    //
    // -- PRIVATE METHODS -----------------------------------------------
    //
    private void writeObject(java.io.ObjectOutputStream out)
        throws java.io.IOException {
        out.defaultWriteObject();
    }

    private void readObject(java.io.ObjectInputStream in)
        throws java.io.IOException, ClassNotFoundException {
        in.defaultReadObject();
        // set open to the default value
        open = defaultOpenState;
    }
}

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