Creating Performance Counters in Java

Question

Does anyone know how can I create a new Performance Counter (perfmon tool) in Java?

For example: a new performance counter for monitoring the number / duration of user actions.

I created such performance counters in C# and it was quite easy, however I couldn’t find anything helpful for creating it in Java…

possible duplicate of Java app performance counters viewed in Perfmon — Thorbjørn Ravn Andersen
– Thorbjørn Ravn Andersen, Commented Dec 21, 2010 at 14:39

Benoit Courtine · Accepted Answer · 2010-12-21 14:37:52Z

If you want to develop your performance counter independently from the main code, you should look at aspect programming (AspectJ, Javassist).

You'll can plug your performance counter on the method(s) you want without modifying the main code.

Peter Lawrey · Accepted Answer · 2010-12-21 14:58:02Z

Not sure what you are expecting this tool to do but I would create some data structures to record these times and counts like

class UserActionStats { int count; long durationMS; long start = 0; public void startAction() { start = System.currentTimeMillis(); } public void endAction() { durationMS += System.currentTimeMillis() - start; count++; } }

A collection for these could look like

private static final Map<String, UserActionStats> map = new HashMap<String, UserActionStats>(); public static UserActionStats forUser(String userName) { synchronized(map) { UserActionStats uas = map.get(userName); if (uas == null) map.put(userName, uas = new UserActionStats()); return uas; } }

Shouldn't your durationMS actually be incrementing: start - System.currentTimeMillis();
Thanks, but I don’t think it exactly what I meant. I want to view my performance counter in perfmon tool. A simple measurement of duration or number will not be updated there and will not be stored in the perfmon logs

Community · Accepted Answer · 2017-05-23 12:07:20Z

Java does not immediately work with perfmon (but you should see DTrace under Solaris).

Please see this question for suggestions: Java app performance counters viewed in Perfmon

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