org/objectweb/proactive/core/body/ActiveBody.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.body;


import org.apache.log4j.Logger;
import org.objectweb.proactive.Active;
import org.objectweb.proactive.Body;
import org.objectweb.proactive.EndActive;
import org.objectweb.proactive.InitActive;
import org.objectweb.proactive.RunActive;
import org.objectweb.proactive.Service;
import org.objectweb.proactive.core.component.body.ComponentActivity;
import org.objectweb.proactive.core.component.body.ComponentBodyImpl;
import org.objectweb.proactive.core.mop.ConstructorCall;
import org.objectweb.proactive.core.mop.ConstructorCallExecutionFailedException;
import org.objectweb.proactive.core.util.log.Loggers;
import org.objectweb.proactive.core.util.log.ProActiveLogger;


public class ActiveBody extends ComponentBodyImpl implements Runnable,
    java.io.Serializable {
    protected static Logger logger = ProActiveLogger.getLogger(Loggers.BODY);

    //
    // -- STATIC MEMBERS -----------------------------------------------
    //
    //
    // -- PROTECTED MEMBERS -----------------------------------------------
    //
    //
    // -- PRIVATE MEMBERS -----------------------------------------------
    //
    private transient InitActive initActive; // used only once when active object is started first time
    private RunActive runActive;
    private EndActive endActive;

    //
    // -- CONSTRUCTORS -----------------------------------------------
    //

    public ActiveBody() {
    }

    public ActiveBody(ConstructorCall c, String nodeURL, Active activity,
        MetaObjectFactory factory, String jobID)
        throws java.lang.reflect.InvocationTargetException, 
            ConstructorCallExecutionFailedException {
        // Creates the reified object
        super(c.execute(), nodeURL, activity, factory, jobID);

        Object reifiedObject = localBodyStrategy.getReifiedObject();

        // when building a component, encapsulate the functional activity
        // TODO_M read some flag before doing this?
        if (getProActiveComponentImpl() != null) {
            activity = new ComponentActivity(activity, reifiedObject);
        }

        // InitActive
        if ((activity != null) && activity instanceof InitActive) {
            initActive = (InitActive) activity;
        } else if (reifiedObject instanceof InitActive) {
            initActive = (InitActive) reifiedObject;
        }

        // RunActive
        if ((activity != null) && activity instanceof RunActive) {
            runActive = (RunActive) activity;
        } else if (reifiedObject instanceof RunActive) {
            runActive = (RunActive) reifiedObject;
        } else {
            runActive = new FIFORunActive();
        }

        // EndActive
        if ((activity != null) && activity instanceof EndActive) {
            endActive = (EndActive) activity;
        } else if (reifiedObject instanceof EndActive) {
            endActive = (EndActive) reifiedObject;
        } else {
            endActive = null;
        }

        startBody();
    }

    //
    // -- PUBLIC METHODS -----------------------------------------------
    //
    //
    // -- implements Runnable -----------------------------------------------
    //

    public void run() {
        activityStarted();
        // execute the initialization if needed. Only once
        if (initActive != null) {
            initActive.initActivity(this);
            initActive = null; // we won't do it again
        }

        // run the activity of the body
        try {
            runActive.runActivity(this);
            // the body terminate its activity
            if (isActive()) {
                // serve remaining requests if non dead
                while (!(localBodyStrategy.getRequestQueue().isEmpty())) {
                    serve(localBodyStrategy.getRequestQueue().removeOldest());
                }
            }
        } catch (Exception e) {
            logger.error("Exception occured in runActivity method of body " +
                toString() + ". Now terminating the body");

            e.printStackTrace();
            terminate();
        } finally {
            // execute the end of activity if not after migration
            if ((!hasJustMigrated) && (endActive != null)) {
                endActive.endActivity(this);
            }

            if (isActive()) {
                activityStopped();
            }
        }
    }

    //
    // -- PROTECTED METHODS -----------------------------------------------
    //

    public void startBody() {
        if (logger.isDebugEnabled()) {
            logger.debug("Starting Body");
        }

        // get the incarnation number if ft is enable
        String inc = (this.ftmanager != null) ? ("" + this.ftmanager) : ("");
        Thread t = new Thread(this,
                shortClassName(getName()) + " on " + getNodeURL() + inc);
        t.start();
    }

    protected void activityStopped() {
        super.activityStopped();
        runActive = null;
    }

    // 
    // -- PRIVATE METHODS -----------------------------------------------
    //
    private static String shortClassName(String fqn) {
        int n = fqn.lastIndexOf('.');
        if ((n == -1) || (n == (fqn.length() - 1))) {
            return fqn;
        }
        return fqn.substring(n + 1);
    }

    private void writeObject(java.io.ObjectOutputStream out)
        throws java.io.IOException {
        if (logger.isDebugEnabled()) {
            logger.debug("out = " + out);
        }
        out.defaultWriteObject();
    }

    private void readObject(java.io.ObjectInputStream in)
        throws java.io.IOException, ClassNotFoundException {
        if (logger.isDebugEnabled()) {
            logger.debug("in = " + in);
        }
        in.defaultReadObject();
        // FAULT-TOLERANCE: if this is a recovering checkpoint, 
        // activity will be started in ProActiveRuntimeImpl.receiveCheckpoint()
        if (this.ftmanager != null) {
            if (!this.ftmanager.isACheckpoint()) {
                startBody();
            }
        } else {
            startBody();
        }
    }

    //
    // -- INNER CLASSES -----------------------------------------------
    //
    private class FIFORunActive implements RunActive, java.io.Serializable {
        public void runActivity(Body body) {
            new Service(body).fifoServing();
        }
    }
}

---