001/**
002 * Copyright 2005-2017 The Kuali Foundation
003 *
004 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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 */
016package org.kuali.rice.kew.plugin;
017
018import java.util.Collections;
019import java.util.HashSet;
020import java.util.Iterator;
021import java.util.Set;
022
023/**
024 * A runnable which continuously polls Reloadable to see if they need to be reloaded.
025 *
026 * @author Kuali Rice Team (rice.collab@kuali.org)
027 */
028public class Reloader implements Runnable {
029
030    private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(Reloader.class);
031
032    private final Set<Reloadable> reloadables = Collections.synchronizedSet(new HashSet<Reloadable>());
033
034    public void run() {
035        try {
036                LOG.debug("Checking if any reloading is necessary...");
037                synchronized (reloadables) {
038                        for (Iterator iterator = reloadables.iterator(); iterator.hasNext();) {
039                                Reloadable reloadable = (Reloadable) iterator.next();
040                                LOG.debug("Checking reloadable: " + reloadable);
041                                if (reloadable.isReloadable() && reloadable.isReloadNeeded()) {
042                                        /*long reloadWaitTime = getPluginReloadWaitTime();
043                                         LOG.info("Detected that a reload was needed...sleeping for "+(reloadWaitTime/1000)+" seconds...");
044                                         sleep(getPluginReloadWaitTime());*/
045                                        LOG.info("Reloading: " + reloadable);
046                                        reloadable.reload();
047                        /*sleep(5000);*/
048                                }
049                        }
050                }
051        } catch (Throwable t) {
052                LOG.error("Failed to reload plugin.", t);
053        }
054    }
055
056    public void addReloadable(Reloadable reloadable) {
057        reloadables.add(reloadable);
058    }
059
060    public void removeReloadable(Reloadable reloadable) {
061        reloadables.remove(reloadable);
062    }
063
064    public Set<Reloadable> getReloadables() {
065        return reloadables;
066    }
067
068}