001/*
002 * (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id$
020 *
021 */
022package org.nuxeo.ecm.platform.pictures.tiles.service;
023
024import org.apache.commons.logging.Log;
025import org.apache.commons.logging.LogFactory;
026import org.nuxeo.ecm.platform.pictures.tiles.api.PictureTilingService;
027import org.nuxeo.runtime.api.Framework;
028
029/**
030 * Task for GC dedicated Thread
031 *
032 * @author tiry
033 */
034public class GCTask implements Runnable {
035
036    protected static volatile boolean GCEnabled = false;
037
038    private static final String GCINTERVAL_KEY = "GCInterval";
039
040    private static long GC_INTERVAL = 0;
041
042    private static final Log log = LogFactory.getLog(GCTask.class);
043
044    public static long getGCIntervalInMinutes() {
045        if (GC_INTERVAL == 0) {
046            PictureTilingComponent ptc = (PictureTilingComponent) Framework.getService(PictureTilingService.class);
047            GC_INTERVAL = Long.parseLong(ptc.getEnvValue(GCINTERVAL_KEY, Long.toString(10)));
048            log.debug("GC interval set to " + GC_INTERVAL);
049        }
050        return GC_INTERVAL;
051    }
052
053    public static void setGCIntervalInMinutes(long interval) {
054        GC_INTERVAL = interval;
055    }
056
057    public void run() {
058        log.debug("starting GC thread");
059        while (GCEnabled) {
060            PictureTilingCacheGCManager.gcIfNeeded();
061            try {
062                long gcInterval = getGCIntervalInMinutes();
063
064                if (gcInterval < 0) {
065                    // for tests
066                    log.debug("GC sleeps for " + (-gcInterval));
067                    Thread.sleep(-gcInterval);
068                } else {
069                    log.debug("GC sleeps for " + (gcInterval * 60 * 1000));
070                    // GC Interval is stored in minutes
071                    Thread.sleep(gcInterval * 60 * 1000);
072                }
073            } catch (InterruptedException e) {
074                Thread.currentThread().interrupt();
075                GCEnabled = false;
076            }
077        }
078    }
079
080}