Mercurial > hg > blitz_condensed
view src/org/dancres/util/Timestamp.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
---|---|
date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
children |
line wrap: on
line source
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; } } }