| /* |
| * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0, which is available at |
| * http://www.eclipse.org/legal/epl-2.0. |
| * |
| * This Source Code may also be made available under the following Secondary |
| * Licenses when the conditions for such availability set forth in the |
| * Eclipse Public License v. 2.0 are satisfied: GNU General Public License, |
| * version 2 with the GNU Classpath Exception, which is available at |
| * https://www.gnu.org/software/classpath/license.html. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 |
| */ |
| |
| 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(); |
| } |
| |
| public synchronized int getQueueLength() { |
| return list.size(); |
| } |
| |
| public synchronized void addToQueue(Object waitMonitor) { |
| |
| list.addLast(waitMonitor); |
| } |
| |
| public synchronized boolean removeFromQueue(Object o) { |
| return list.remove(o); |
| } |
| |
| /* |
| public synchronized Object removeFirst() { |
| return list.removeFirst(); |
| } |
| */ |
| |
| public synchronized Object remove() { |
| return list.removeFirst(); |
| } |
| |
| public Object peek() { |
| Object result = null; |
| if (list.size() > 0) { |
| result = list.get(0); |
| } |
| return result; |
| } |
| |
| public Collection getQueueContents() { |
| return list; |
| } |
| |
| protected void debug(String debugStatement) { |
| if(_logger.isLoggable(Level.FINE)) { |
| _logger.log(Level.FINE, debugStatement); |
| } |
| } |
| } |