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 org.javasimon.SimonManager;
022import org.javasimon.SimonState;
023import org.nuxeo.runtime.model.ComponentContext;
024import org.nuxeo.runtime.model.DefaultComponent;
025
026/**
027 * Runtime component that provides the {@link CounterManager} service. Uses Simon Counters for implementation
028 *
029 * @author Tiry (tdelprat@nuxeo.com)
030 */
031public class CounterManagerImpl extends DefaultComponent implements CounterManager {
032
033    public static final String COUNTER_PREFIX = "org.nuxeo";
034
035    protected CounterHistoryRecorder history = new CounterHistoryRecorder(50);
036
037    public void enableCounters() {
038        SimonManager.getCounter(COUNTER_PREFIX).setState(SimonState.ENABLED, true);
039    }
040
041    public void disableCounters() {
042        SimonManager.getCounter(COUNTER_PREFIX).setState(SimonState.DISABLED, true);
043    }
044
045    @Override
046    public void applicationStarted(ComponentContext context) {
047        // create the root counter
048        SimonManager.getCounter(COUNTER_PREFIX);
049        // register call back for history management
050        SimonManager.callback().addCallback(history);
051    }
052
053    @Override
054    public void decreaseCounter(String counterName) {
055        if (SimonManager.getCounter(counterName).isEnabled()) {
056            SimonManager.getCounter(counterName).decrease();
057        }
058    }
059
060    @Override
061    public void increaseCounter(String counterName) {
062        if (SimonManager.getCounter(counterName).isEnabled()) {
063            SimonManager.getCounter(counterName).increase();
064        }
065    }
066
067    @Override
068    public void decreaseCounter(String counterName, long value) {
069        if (SimonManager.getCounter(counterName).isEnabled()) {
070            SimonManager.getCounter(counterName).decrease(value);
071        }
072    }
073
074    @Override
075    public void increaseCounter(String counterName, long value) {
076        if (SimonManager.getCounter(counterName).isEnabled()) {
077            SimonManager.getCounter(counterName).increase(value);
078        }
079    }
080
081    @Override
082    public void setCounterValue(String counterName, long value) {
083        if (SimonManager.getCounter(counterName).isEnabled()) {
084            SimonManager.getCounter(counterName).set(value);
085        }
086    }
087
088    public CounterHistoryStack getCounterHistory(String counterName) {
089
090        CounterHistoryStack stack = history.getCounterHistory(counterName);
091        if (stack == null) {
092            return new CounterHistoryStack(50);
093        } else {
094            return stack;
095        }
096    }
097
098}