/**
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
*
* 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.drools;
import org.drools.util.ServiceRegistryImpl;
/**
* This factory allows you to set the SystemEventListener that will be used by various components of Drools, such
* as the KnowledgeAgent, ResourceChangeNotifier and ResourceChangeListener.
*
* The default SystemEventListener
*
*/
public class SystemEventListenerFactory {
private static SystemEventListenerService service;
/**
* Set the SystemEventListener
*
* @param listener
*/
public static void setSystemEventListener(SystemEventListener listener) {
getSystemEventListenerService().setSystemEventListener( listener );
}
/**
* Get the SystemEventListener
* @return
*/
public static SystemEventListener getSystemEventListener() {
return getSystemEventListenerService().getSystemEventListener();
}
private static synchronized void setSystemEventListenerService(SystemEventListenerService service) {
SystemEventListenerFactory.service = service;
}
private static synchronized SystemEventListenerService getSystemEventListenerService() {
if ( service == null ) {
loadService();
}
return service;
}
private static void loadService() {
setSystemEventListenerService( ServiceRegistryImpl.getInstance().get( SystemEventListenerService.class ) );
}
}