org/objectweb/proactive/calcium/skeletons/While.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.calcium.skeletons;

import java.util.Vector;

import org.objectweb.proactive.calcium.Task;
import org.objectweb.proactive.calcium.interfaces.Condition;
import org.objectweb.proactive.calcium.interfaces.Instruction;
import org.objectweb.proactive.calcium.interfaces.Skeleton;
import org.objectweb.proactive.calcium.statistics.Timer;

public class While<T> implements Instruction<T>, Skeleton<T> {

        Condition<T> cond;
        Skeleton<T> child;
        
        public While(Condition<T> cond, Skeleton<T> child){
                this.cond=cond;
                this.child=child;
        }
        
        public Vector<Instruction<T>> getInstructionStack() {
                Vector<Instruction<T>> v = new Vector<Instruction<T>>();
                v.add(this);
                return v;
        }
        
        public Task<T> compute(Task<T> task) throws Exception{
                Timer timer = new Timer();
                boolean evalCondition=cond.evalCondition(task.getObject());
                timer.stop();
                task.getStats().getWorkout().track(cond, timer);
                
                if(evalCondition){
                        //Get Child stack
                        Vector<Instruction<T>> childStack=child.getInstructionStack();
                        
                        //Add me to evaluate while condition after executing child
                        childStack.add(0,this); 
                        
                        //Add new elements to the task's stack
                        Vector<Instruction<T>> taskStack=task.getStack();
                        taskStack.addAll(childStack);
                        task.setStack(taskStack);
                }

                return task;
        }
}

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