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 "InMemoryIDGenerator.java".  Description: 
010"Simple generator that uses AtomicLong as ID source" 
011
012The Initial Developer of the Original Code is University Health Network. Copyright (C) 
0132001.  All Rights Reserved. 
014
015Contributor(s): ______________________________________. 
016
017Alternatively, the contents of this file may be used under the terms of the 
018GNU General Public License (the  "GPL"), in which case the provisions of the GPL are 
019applicable instead of those above.  If you wish to allow use of your version of this 
020file only under the terms of the GPL and not to allow others to use your version 
021of this file under the MPL, indicate your decision by deleting  the provisions above 
022and replace  them with the notice and other provisions required by the GPL License.  
023If you do not delete the provisions above, a recipient may use your version of 
024this file under either the MPL or the GPL. 
025 */
026package ca.uhn.hl7v2.util.idgenerator;
027
028import java.io.IOException;
029import java.util.concurrent.atomic.AtomicLong;
030
031/**
032 * In-memory variant of an message ID generator. Particularly useful for tests
033 * and deployments when duplicate IDs after a restart do no matter.
034 * <p>
035 * 
036 * @author Christian Ohr
037 */
038public class InMemoryIDGenerator extends IDGenerator.OrderedSupport {
039
040        private AtomicLong al = new AtomicLong(0l);
041
042        public InMemoryIDGenerator() {
043                super();
044        }
045
046        InMemoryIDGenerator(long increment) {
047                super(increment);
048        }
049
050        public String getID() throws IOException {
051                return Long.toString(al.getAndAdd(getIncrement()));
052        }
053
054        public synchronized void reset() {
055                set(0l);
056        }
057        
058        protected void set(long l) {
059                al.set(l);
060        }
061
062}