Java tutorial
/** * Copyright (C) 2013 Arman Gal * * 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.clevermore.monitor.server.mongodb; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.List; import org.clevermore.monitor.server.model.config.MongoConfig; import org.clevermore.monitor.server.model.config.MongoConfig.HostAddress; import org.clevermore.monitor.server.services.config.ConfigurationService; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.github.jmkgreen.morphia.Morphia; import com.google.inject.Inject; import com.mongodb.Mongo; import com.mongodb.ServerAddress; public class MongoSessionFactory { private static Logger logger = LoggerFactory.getLogger(MongoSessionFactory.class); private static MongoConfig mongoConfig; private static Mongo mongo; private static Morphia morphia; @Inject public MongoSessionFactory() { mongoConfig = ConfigurationService.getInstance().getMongoConfig(); if (!mongoConfig.getEnabled()) { logger.info("Mongo DB is disabled.Skipping initialization"); return; } List<HostAddress> hosts = mongoConfig.getHosts(); if (hosts == null || hosts.isEmpty()) { throw new RuntimeException("Mongo DB Initialization Error: hosts not configured"); } if (mongoConfig.getDatabaseName() == null || mongoConfig.getDatabaseName().isEmpty()) { throw new RuntimeException("Mongo DB Initialization Error : database name not specified"); } List<ServerAddress> mongoServers = new ArrayList<ServerAddress>(); for (HostAddress host : hosts) { try { mongoServers.add(new ServerAddress(host.getHostName(), host.getPort())); } catch (UnknownHostException e) { throw new RuntimeException("Mongo DB Initialization Error ", e); } } mongo = new Mongo(mongoServers); morphia = new Morphia(); } public static Mongo getMongoInstance() { return mongo; } public static Morphia getMorphiaInstance() { return morphia; } public static MongoConfig getMongoConfig() { return mongoConfig; } }