/*
* Copyright 2012 Red Hat, Inc. and/or its affiliates.
*
* 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.jbpm.services.task.deadlines.notifications.impl;
import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;
import org.jbpm.services.task.deadlines.NotificationListener;
import org.kie.internal.task.api.UserInfo;
import org.kie.internal.task.api.model.NotificationEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Manages broadcasting of notification events to all found listeners
*
*/
public class NotificationListenerManager {
private static final Logger logger = LoggerFactory.getLogger(NotificationListenerManager.class);
private static ServiceLoader<NotificationListener> listenersLoaded = ServiceLoader.load(NotificationListener.class);
private static NotificationListenerManager INSTANCE = new NotificationListenerManager();
private List<NotificationListener> listeners = new ArrayList<NotificationListener>();
private NotificationListenerManager() {
for (NotificationListener listener : listenersLoaded) {
listeners.add(listener);
}
}
/**
* Broadcast given event to all listeners independently meaning catches possible exceptions to
* avoid breaking notification by listeners
* @param event notification event to be sent
* @param params additional parameters see NotificationListener.onNotification for details.
*
* @see NotificationListener#onNotification(NotificationEvent, Object...)
*/
public void broadcast(NotificationEvent event, UserInfo userInfo) {
for (NotificationListener listener : listeners) {
try {
logger.debug("Sending notification {} to {} with params {}", event, listener, userInfo);
listener.onNotification(event, userInfo);
} catch (Exception e) {
logger.warn("Exception encountered while notifying listener {} with event {} - error {}",
listener, event, e.getMessage());
}
}
}
public static NotificationListenerManager get() {
return INSTANCE;
}
}