/*
    * Copyright 2005-2008 The Kuali Foundation
    *
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.kew.plugin;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  
  /**
   * A runnable which continuously polls Reloadable to see if they need to be reloaded.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class Reloader implements Runnable {
  
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(Reloader.class);
  
      private final Set<Reloadable> reloadables = Collections.synchronizedSet(new HashSet<Reloadable>());
  
      public void run() {
      	try {
      		LOG.debug("Checking if any reloading is necessary...");
      		synchronized (reloadables) {
      			for (Iterator iterator = reloadables.iterator(); iterator.hasNext();) {
      				Reloadable reloadable = (Reloadable) iterator.next();
      				LOG.debug("Checking reloadable: " + reloadable);
      				if (reloadable.isReloadable() && reloadable.isReloadNeeded()) {
      					/*long reloadWaitTime = getPluginReloadWaitTime();
      					 LOG.info("Detected that a reload was needed...sleeping for "+(reloadWaitTime/1000)+" seconds...");
      					 sleep(getPluginReloadWaitTime());*/
      					LOG.info("Reloading: " + reloadable);
      					reloadable.reload();
                      	/*sleep(5000);*/
      				}
      			}
      		}
      	} catch (Throwable t) {
      		LOG.error("Failed to reload plugin.", t);
      	}
      }
  
      public void addReloadable(Reloadable reloadable) {
          reloadables.add(reloadable);
      }
  
      public void removeReloadable(Reloadable reloadable) {
          reloadables.remove(reloadable);
      }
  
      public Set<Reloadable> getReloadables() {
      	return reloadables;
      }
  
  }