001/**
002The contents of this file are subject to the Mozilla Public License Version 1.1 
003(the "License"); you may not use this file except in compliance with the License. 
004You may obtain a copy of the License at http://www.mozilla.org/MPL/ 
005Software distributed under the License is distributed on an "AS IS" basis, 
006WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 
007specific language governing rights and limitations under the License. 
008
009The Original Code is "DefaultExecutorService.java".  Description: 
010"Provides a global cached thread pool if Connections and Servers are not
011initialized with their specific {@link ExecutorService} instances" 
012
013The Initial Developer of the Original Code is University Health Network. Copyright (C) 
0142001.  All Rights Reserved. 
015
016Contributor(s): ______________________________________. 
017
018Alternatively, the contents of this file may be used under the terms of the 
019GNU General Public License (the "GPL"), in which case the provisions of the GPL are 
020applicable instead of those above.  If you wish to allow use of your version of this 
021file only under the terms of the GPL and not to allow others to use your version 
022of this file under the MPL, indicate your decision by deleting  the provisions above 
023and replace  them with the notice and other provisions required by the GPL License.  
024If you do not delete the provisions above, a recipient may use your version of 
025this file under either the MPL or the GPL. 
026
027 */
028package ca.uhn.hl7v2.concurrent;
029
030import java.util.concurrent.CompletionService;
031import java.util.concurrent.ExecutorCompletionService;
032import java.util.concurrent.ExecutorService;
033import java.util.concurrent.Executors;
034
035/**
036 * Provides a global cached thread pool if Connections and Servers are not
037 * initialized with their specific {@link ExecutorService} instances.
038 */
039public class DefaultExecutorService {
040
041        static ExecutorService defaultExecutorService;
042
043        public static synchronized ExecutorService getDefaultService() {
044                if (defaultExecutorService == null
045                                || defaultExecutorService.isShutdown()) {
046                        defaultExecutorService = Executors.newCachedThreadPool();
047                }
048                return defaultExecutorService;
049        }
050
051        public static <V> CompletionService<V> completionService(
052                        ExecutorService executor) {
053                return new ExecutorCompletionService<V>(executor);
054        }
055
056        /**
057         * @return true if the service was created by this class
058         */
059        public static boolean isDefaultService(ExecutorService service) {
060                return service == defaultExecutorService;
061        }
062        
063        /**
064         * @see {@link ExecutorService#shutdown()}
065         */
066        public static void shutdown() {
067                defaultExecutorService.shutdown();
068        }
069        
070        /**
071         * @see {@link ExecutorService#shutdownNow()}
072         */
073        public static void shutdownNow() {
074                defaultExecutorService.shutdownNow();
075        }       
076        
077}