com.sun.enterprise.resource.pool.PoolLifeCycleRegistry Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of connectors-runtime
There is a newer version: 10.0-b28
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License").  You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code.  If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license."  If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above.  However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.enterprise.resource.pool;

import com.sun.enterprise.connectors.ConnectorRuntime;
import com.sun.enterprise.resource.listener.PoolLifeCycle;
import java.util.ArrayList;
import java.util.List;
import org.jvnet.hk2.annotations.Scoped;
import org.jvnet.hk2.component.Singleton;

/**
 * Implementation of PoolLifeCycle to listen to events related to a 
 * connection pool creation or destroy. The registry allows multiple listeners 
 * (ex: pool monitoring or self management)
 * to listen to the pool's lifecyle. Maintains a list of listeners for this pool
 * identified by poolName.
 * 
 * @author Shalini M
 */
@Scoped(Singleton.class)
public class PoolLifeCycleRegistry implements PoolLifeCycle {

    //List of listeners 
    protected List lifeCycleListeners = new ArrayList();
    private static PoolLifeCycleRegistry __poolLifeCycleRegistry = 
            new PoolLifeCycleRegistry();
    
    public PoolLifeCycleRegistry() {
    }

    public static PoolLifeCycleRegistry getRegistry() {
        if(__poolLifeCycleRegistry == null) {
            throw new RuntimeException("PoolLifeCycleRegistry not initialized");
        }
        return __poolLifeCycleRegistry;
    }
    /**
     * Add a listener to the list of pool life cycle listeners maintained by 
     * this registry for the poolName.
     * @param poolName
     * @param listener
     */
    public void registerPoolLifeCycle(PoolLifeCycle listener) {
        lifeCycleListeners.add(listener);
        
        //Check if lifecycleListeners has already been set to this. There
        //could be multiple listeners.
        if(!(lifeCycleListeners.size() > 1)) {
            //If the pool is already created, set this registry object to the pool.
            PoolManager poolMgr = ConnectorRuntime.getRuntime().getPoolManager();
            poolMgr.registerPoolLifeCycleListener(this);
        }
    }

    /**
     * Clear the list of pool lifecycle listeners maintained by the registry.
     * This happens when a pool is destroyed so the information about its 
     * listeners need not be stored.
     */
    public void unRegisterPoolLifeCycle(PoolLifeCycle listener) {
        if (lifeCycleListeners != null && !lifeCycleListeners.isEmpty()) {
            lifeCycleListeners.remove(listener);
        }
        if (lifeCycleListeners.isEmpty()) {
            //TODO V3 : think about unregistering the registry?
        }
    }
    
    /**
     * Invoke poolCreated for all listeners of this pool.
     * @param poolName
     */
    public void poolCreated(String poolName) {
        for (PoolLifeCycle listener : lifeCycleListeners) {
            listener.poolCreated(poolName);
        }
    }

    /**
     * Invoke poolDestroyed for all listeners of this pool.
     * @param poolName
     */
    public void poolDestroyed(String poolName) {
        for (PoolLifeCycle listener : lifeCycleListeners) {
            listener.poolDestroyed(poolName);
        }
    }
}