Mercurial > hg > blitz_stable
diff src/org/dancres/util/Timestamp.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/org/dancres/util/Timestamp.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,52 @@ +package org.dancres.util; + +import java.util.HashMap; + +/** + Generates timestamps values which can be used to uniquely order events. + */ +public class Timestamp { + private static HashMap theTimestamps = new HashMap(); + + public static Timestamp newTimestamp(String aName) { + synchronized(theTimestamps) { + if (theTimestamps.get(aName) != null) + throw new IllegalArgumentException("Timestamp already exists"); + + Timestamp myTimestamp = new Timestamp(); + theTimestamps.put(aName, myTimestamp); + + return myTimestamp; + } + } + + public static Timestamp getTimestamp(String aName) { + synchronized(theTimestamps) { + return (Timestamp) theTimestamps.get(aName); + } + } + + long theStamp = 0; + + private Timestamp() { + } + + /** + Returns the last timestamp allocated or zero if none have been + allocated yet. + */ + public long get() { + synchronized(this) { + return theStamp; + } + } + + /** + Return the next timestamp + */ + public long next() { + synchronized(this) { + return ++theStamp; + } + } +}