org/objectweb/proactive/core/component/adl/Registry.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.component.adl;

import java.util.Hashtable;
import java.util.Iterator;

import org.apache.log4j.Logger;
import org.objectweb.fractal.adl.ADLException;
import org.objectweb.fractal.api.Component;
import org.objectweb.fractal.api.NoSuchInterfaceException;
import org.objectweb.fractal.util.Fractal;
import org.objectweb.proactive.core.group.Group;
import org.objectweb.proactive.core.group.ProActiveGroup;
import org.objectweb.proactive.core.util.log.Loggers;
import org.objectweb.proactive.core.util.log.ProActiveLogger;


public class Registry {
    private static Logger logger = ProActiveLogger.getLogger(Loggers.COMPONENTS_ADL);
    static private Registry instance = null;
    private Hashtable table;

    private Registry() {
        table = new Hashtable();
    }

    static public Registry instance() {
        if (instance == null) {
            instance = new Registry();
        }
        return instance;
    }

    public void addComponent(Component component) throws ADLException {
        if (ProActiveGroup.isGroup(component)) {
            Group group = ProActiveGroup.getGroup(component);
            Iterator it = group.iterator();
            while (it.hasNext()) {
                addComponent((Component) it.next());
            }
        } else {
            try {
                String name = Fractal.getNameController(component).getFcName();
                if (table.containsKey(name)) {
                    throw new ADLException("A component with the name " + name +
                        " is already stored in the registry", null);
                }
                table.put(name, component);
                if (logger.isDebugEnabled()) {
                    logger.debug("added component " + name +
                        " to the local registry");
                }
            } catch (NoSuchInterfaceException e) {
                throw new ADLException("It is not possible to register a component without a NameController controller",
                    null);
            }
        }
    }

    public Component getComponent(String name) {
        return (Component) table.get(name);
    }

    public void clear() {
        table.clear();
    }
}

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