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comparison src/org/dancres/util/Timestamp.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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-1:000000000000 0:3dc0c5604566
1 package org.dancres.util;
2
3 import java.util.HashMap;
4
5 /**
6 Generates timestamps values which can be used to uniquely order events.
7 */
8 public class Timestamp {
9 private static HashMap theTimestamps = new HashMap();
10
11 public static Timestamp newTimestamp(String aName) {
12 synchronized(theTimestamps) {
13 if (theTimestamps.get(aName) != null)
14 throw new IllegalArgumentException("Timestamp already exists");
15
16 Timestamp myTimestamp = new Timestamp();
17 theTimestamps.put(aName, myTimestamp);
18
19 return myTimestamp;
20 }
21 }
22
23 public static Timestamp getTimestamp(String aName) {
24 synchronized(theTimestamps) {
25 return (Timestamp) theTimestamps.get(aName);
26 }
27 }
28
29 long theStamp = 0;
30
31 private Timestamp() {
32 }
33
34 /**
35 Returns the last timestamp allocated or zero if none have been
36 allocated yet.
37 */
38 public long get() {
39 synchronized(this) {
40 return theStamp;
41 }
42 }
43
44 /**
45 Return the next timestamp
46 */
47 public long next() {
48 synchronized(this) {
49 return ++theStamp;
50 }
51 }
52 }