org/objectweb/proactive/core/group/spmd/MethodCallBarrier.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.group.spmd;

import java.lang.reflect.InvocationTargetException;

import org.objectweb.proactive.ProActive;
import org.objectweb.proactive.core.body.AbstractBody;
import org.objectweb.proactive.core.group.MethodCallControlForGroup;
import org.objectweb.proactive.core.mop.MethodCallExecutionFailedException;


public class MethodCallBarrier extends MethodCallControlForGroup {

    private String IDName;

    public MethodCallBarrier(String idname) {
        this.IDName = idname;
    }

    public String getName() {
        return "MethodCallBarrier";
    }

    public String getIDName() {
        return this.IDName;
    }

    public Object execute(Object target)
        throws InvocationTargetException, MethodCallExecutionFailedException {
        ProActiveSPMDGroupManager spmdManager = ((AbstractBody) ProActive.getBodyOnThis()).getProActiveSPMDGroupManager();
        BarrierState bs = (BarrierState) spmdManager.getBarrierStateFor(this.getIDName());

        // bs == null  =>  state not found  =>  first barrier encountered for ID name
        if (bs == null) {
            bs = new BarrierState();
            spmdManager.addToCurrentBarriers(this.getIDName(), bs);
        }
        bs.incrementReceivedCalls();
        // if there is no others waiting calls, release the barrier
        if ((bs.getAwaitedCalls() - bs.getReceivedCalls()) == 0) {
            spmdManager.remove(this.getIDName());
        }
        return null;
    }
}

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