001/*
002 * (C) Copyright 2006-2009 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 * $Id$
018 */
019package org.nuxeo.runtime.management.counters;
020
021import java.util.Map;
022import java.util.concurrent.ConcurrentHashMap;
023
024import org.javasimon.CallbackSkeleton;
025import org.javasimon.Counter;
026
027/**
028 * Listen to Simon events to store past values of the counters History is kept in memory using
029 * {@link CounterHistoryStack}
030 *
031 * @author Tiry (tdelprat@nuxeo.com)
032 */
033public class CounterHistoryRecorder extends CallbackSkeleton {
034
035    protected Map<String, CounterHistoryStack> counterHistory = new ConcurrentHashMap<String, CounterHistoryStack>();
036
037    protected int historyLength = 100;
038
039    public CounterHistoryRecorder(int size) {
040        historyLength = size;
041    }
042
043    protected CounterHistoryStack getCounterHistoryStack(Counter counter) {
044        CounterHistoryStack stack = counterHistory.get(counter.getName());
045        if (stack == null) {
046            stack = new CounterHistoryStack(historyLength);
047            counterHistory.put(counter.getName(), stack);
048        }
049        return stack;
050    }
051
052    protected void storeCounter(Counter counter) {
053        getCounterHistoryStack(counter).push(new long[] { System.currentTimeMillis(), counter.getCounter() });
054    }
055
056    @Override
057    public void counterDecrease(Counter counter, long dec) {
058        storeCounter(counter);
059    }
060
061    @Override
062    public void counterSet(Counter counter, long val) {
063        storeCounter(counter);
064    }
065
066    @Override
067    public void counterIncrease(Counter counter, long inc) {
068        storeCounter(counter);
069    }
070
071    public CounterHistoryStack getCounterHistory(String counterName) {
072        return counterHistory.get(counterName);
073    }
074}