See
http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/ConcurrentLinkedQueue.html
and the following test programm:
public class QueueLengthTimeTest {
public static long countTest(Queue<Integer> q, int c) {
long t = System.currentTimeMillis();
for (int i = 0; i < c; i++) {
q.add(q.size());
}
return System.currentTimeMillis() - t;
}
public static void main(String[] args) {
int c = 1;
for (int i = 0; i < 100; i++) {
Runtime.getRuntime().gc();
long t1 = countTest(new ArrayBlockingQueue<Integer>(c), c);
Runtime.getRuntime().gc();
long t2 = countTest(new LinkedBlockingQueue<Integer>(), c);
Runtime.getRuntime().gc();
long t3 = countTest(new ConcurrentLinkedQueue<Integer>(),
c);
System.out.println("count = " + c + ": ArrayBlockingQueue =
" + t1 + ", LinkedBlockingQueue = " + t2 + ", ConcurrentLinkedQueue = "
+ t3);
c = c * 2;
}
}
}
"Session_:53600#0_POST /yacy/hello.html HTTP/1.1" prio=10 tid=0x2322b000 nid=0x3ba7 runnable [0x03d3e000]
java.lang.Thread.State: RUNNABLE
at java.lang.Long.valueOf(Long.java:557)
at de.anomic.server.serverAccessTracker.clearTooOldAccess(serverAccessTracker.java:113)
at de.anomic.server.serverAccessTracker.cleanupAccessTracker(serverAccessTracker.java:75)
- locked <0x3bda2ae8> (a de.anomic.server.serverAccessTracker)
at de.anomic.server.serverAccessTracker.track(serverAccessTracker.java:125)
at de.anomic.server.serverSwitch.track(serverSwitch.java:542)
at de.anomic.http.server.HTTPDemon.parseRequestLine(HTTPDemon.java:641)
at de.anomic.http.server.HTTPDemon.POST(HTTPDemon.java:491)
at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at de.anomic.server.serverCore$Session.listen(serverCore.java:757)
at de.anomic.server.serverCore$Session.run(serverCore.java:651)
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7862 6c8d7289-2bf4-0310-a012-ef5d649a1542
- not so much abstraction for a collection, makes use of remove() (no operands) possible
- different way to delete elements in track (destructive, not constructive (less copies of elements in new queue))
- more abstraction for class api since no static class must be used any more
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7169 6c8d7289-2bf4-0310-a012-ef5d649a1542
Michael Peter Christen