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 "NanoTimeGenerator.java".  Description: 
010"Simple ID generator that uses the current timestamp as ID" 
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;
029
030/**
031 * ID generator that simply returns the return value of System.nanoTime(). If ID
032 * generation happens too fast, there may be duplicate IDs, therefore the generation
033 * is delayed by 1ms.
034 * 
035 * @author Christian Ohr
036 */
037public class NanoTimeGenerator implements IDGenerator {
038
039        public synchronized String getID() throws IOException {
040                try {
041                        Thread.sleep(1l);
042                } catch (InterruptedException e) {
043                }
044                return Long.toString(System.nanoTime());
045        }
046
047}