com.sun.enterprise.resource.pool.waitqueue.DefaultPoolWaitQueue Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of payara-micro Show documentation
Micro Distribution of the Payara Project
There is a newer version: 7.2024.1.Alpha1
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. 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_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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.waitqueue;

import com.sun.logging.LogDomains;

import java.util.Collection;
import java.util.LinkedList;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Default wait queue for the connection pool
 *
 * @author Jagadish Ramu
 */
public class DefaultPoolWaitQueue implements PoolWaitQueue {

    private LinkedList list;
    protected final static Logger _logger = LogDomains.getLogger(DefaultPoolWaitQueue.class, LogDomains.RSR_LOGGER);

    private void initializeDefaultQueue() {
        list = new LinkedList();
        debug("Initializing default Pool Wait Queue");
    }

    public DefaultPoolWaitQueue() {
        initializeDefaultQueue();
    }

    @Override
    public synchronized int getQueueLength() {
        return list.size();
    }

    @Override
    public synchronized void addToQueue(Object waitMonitor) {
        list.addLast(waitMonitor);
    }

    @Override
    public synchronized boolean removeFromQueue(Object o) {
        return list.remove(o);
    }

/*
    public synchronized Object removeFirst() {
        return list.removeFirst();
    }
*/

    @Override
    public synchronized Object remove() {
        return list.removeFirst();
    }

    @Override
    public Object peek() {
        Object result = null;
        if (list.size() > 0) {
            result = list.get(0);
        }
        return result;
    }

    @Override
    public Collection getQueueContents() {
        return list;
    }

    protected void debug(String debugStatement) {
        if(_logger.isLoggable(Level.FINE)) {
            _logger.log(Level.FINE, debugStatement);
        }
    }
}