| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.eagle.notification.plugin; |
| |
| import com.typesafe.config.Config; |
| import org.apache.eagle.alert.entity.AlertNotificationEntity; |
| import org.apache.eagle.notification.base.NotificationConstants; |
| import org.apache.eagle.notification.dao.AlertNotificationDAO; |
| import org.apache.eagle.notification.dao.AlertNotificationDAOImpl; |
| import org.apache.eagle.service.client.EagleServiceConnector; |
| import org.reflections.Reflections; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.*; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Created on 2/10/16. |
| * don't support dynamic discovery as of 2/10 |
| */ |
| public class NotificationPluginLoader { |
| private static final Logger LOG = LoggerFactory.getLogger(NotificationPluginLoader.class); |
| private static NotificationPluginLoader instance = new NotificationPluginLoader(); |
| private static Map<String,NotificationPlugin> notificationMapping = new ConcurrentHashMap<>(); |
| |
| private Config config; |
| private boolean initialized = false; |
| |
| public static NotificationPluginLoader getInstance(){ |
| return instance; |
| } |
| |
| public void init(Config config){ |
| if(!initialized){ |
| synchronized (this){ |
| if(!initialized){ |
| internalInit(config); |
| initialized = true; |
| } |
| } |
| } |
| } |
| |
| private void internalInit(Config config){ |
| this.config = config; |
| loadPlugins(); |
| } |
| |
| /** |
| * Scan & Load Plugins |
| */ |
| private void loadPlugins(){ |
| try { |
| LOG.info("Start loading Plugins from eagle service ..."); |
| AlertNotificationDAO dao = new AlertNotificationDAOImpl(new EagleServiceConnector(config)); |
| List<AlertNotificationEntity> activeNotificationPlugins = dao.findAlertNotificationTypes(); |
| for(AlertNotificationEntity plugin : activeNotificationPlugins){ |
| notificationMapping.put(plugin.getTags().get(NotificationConstants.NOTIFICATION_TYPE), |
| (NotificationPlugin) Class.forName(plugin.getClassName()).newInstance()); |
| } |
| LOG.info("successfully loaded Plugins from eagle service " + activeNotificationPlugins); |
| }catch ( Exception ex ){ |
| LOG.error("Error in loading Notification Plugins: ", ex); |
| throw new IllegalStateException(ex); |
| } |
| } |
| |
| public Map<String, NotificationPlugin> getNotificationMapping() { |
| ensureInitialized(); |
| return notificationMapping; |
| } |
| |
| private void ensureInitialized(){ |
| if(!initialized) |
| throw new IllegalStateException("Plugin loader not initialized"); |
| } |
| } |