1 /**
2 The contents of this file are subject to the Mozilla Public License Version 1.1
3 (the "License"); you may not use this file except in compliance with the License.
4 You may obtain a copy of the License at http://www.mozilla.org/MPL/
5 Software distributed under the License is distributed on an "AS IS" basis,
6 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
7 specific language governing rights and limitations under the License.
8
9 The Original Code is "InMemoryIDGenerator.java". Description:
10 "Simple generator that uses AtomicLong as ID source"
11
12 The Initial Developer of the Original Code is University Health Network. Copyright (C)
13 2001. All Rights Reserved.
14
15 Contributor(s): ______________________________________.
16
17 Alternatively, the contents of this file may be used under the terms of the
18 GNU General Public License (the "GPL"), in which case the provisions of the GPL are
19 applicable instead of those above. If you wish to allow use of your version of this
20 file only under the terms of the GPL and not to allow others to use your version
21 of this file under the MPL, indicate your decision by deleting the provisions above
22 and replace them with the notice and other provisions required by the GPL License.
23 If you do not delete the provisions above, a recipient may use your version of
24 this file under either the MPL or the GPL.
25 */
26 package ca.uhn.hl7v2.util.idgenerator;
27
28 import java.io.IOException;
29 import java.util.concurrent.atomic.AtomicLong;
30
31 /**
32 * In-memory variant of an message ID generator. Particularly useful for tests
33 * and deployments when duplicate IDs after a restart do no matter.
34 * <p>
35 *
36 * @author Christian Ohr
37 */
38 public class InMemoryIDGenerator extends IDGenerator.OrderedSupport {
39
40 private final AtomicLong al = new AtomicLong(0L);
41
42 public InMemoryIDGenerator() {
43 super();
44 }
45
46 InMemoryIDGenerator(long increment) {
47 super(increment);
48 }
49
50 public String getID() throws IOException {
51 return Long.toString(al.getAndAdd(getIncrement()));
52 }
53
54 public synchronized void reset() {
55 set(0L);
56 }
57
58 protected void set(long l) {
59 al.set(l);
60 }
61
62 }