Mercurial > hg > blitz_stable

annotate src/org/dancres/util/Timestamp.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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1 package org.dancres.util;
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2
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3 import java.util.HashMap;
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4
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5 /**
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6 Generates timestamps values which can be used to uniquely order events.
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7 */
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8 public class Timestamp {
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9 private static HashMap theTimestamps = new HashMap();
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10
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11 public static Timestamp newTimestamp(String aName) {
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12 synchronized(theTimestamps) {
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13 if (theTimestamps.get(aName) != null)
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14 throw new IllegalArgumentException("Timestamp already exists");
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15
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16 Timestamp myTimestamp = new Timestamp();
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17 theTimestamps.put(aName, myTimestamp);
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18
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19 return myTimestamp;
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20 }
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21 }
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22
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23 public static Timestamp getTimestamp(String aName) {
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24 synchronized(theTimestamps) {
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25 return (Timestamp) theTimestamps.get(aName);
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26 }
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27 }
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28
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29 long theStamp = 0;
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30
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31 private Timestamp() {
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32 }
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33
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34 /**
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35 Returns the last timestamp allocated or zero if none have been
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36 allocated yet.
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37 */
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38 public long get() {
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39 synchronized(this) {
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40 return theStamp;
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41 }
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42 }
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43
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44 /**
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45 Return the next timestamp
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46 */
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47 public long next() {
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48 synchronized(this) {
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49 return ++theStamp;
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50 }
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51 }
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52 }