| /* |
| * 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.ambari.view.hive20; |
| |
| import akka.actor.ActorRef; |
| import akka.actor.ActorSystem; |
| import akka.actor.Inbox; |
| import akka.actor.PoisonPill; |
| import akka.actor.Props; |
| import com.google.common.base.Optional; |
| import com.typesafe.config.Config; |
| import com.typesafe.config.ConfigFactory; |
| import org.apache.ambari.view.ViewContext; |
| import org.apache.ambari.view.hive20.actor.DeathWatch; |
| import org.apache.ambari.view.hive20.actor.OperationController; |
| import org.apache.ambari.view.hive20.internal.ConnectionSupplier; |
| import org.apache.ambari.view.hive20.internal.DataStorageSupplier; |
| import org.apache.ambari.view.hive20.internal.HdfsApiSupplier; |
| import org.apache.ambari.view.hive20.internal.SafeViewContext; |
| import org.apache.parquet.Strings; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| public class ConnectionSystem { |
| |
| private static final String ACTOR_SYSTEM_NAME = "HiveViewActorSystem"; |
| private ActorSystem actorSystem = null; |
| private static volatile ConnectionSystem instance = null; |
| private static final Object lock = new Object(); |
| private static Map<String, Map<String, ActorRef>> operationControllerMap = new ConcurrentHashMap<>(); |
| |
| // credentials map stores usernames and passwords |
| private static Map<String, String> credentialsMap = new ConcurrentHashMap<>(); |
| |
| private ConnectionSystem() { |
| ClassLoader classLoader = getClass().getClassLoader(); |
| Config config = ConfigFactory.load(classLoader); |
| this.actorSystem = ActorSystem.create(ACTOR_SYSTEM_NAME, config, classLoader); |
| } |
| |
| public static ConnectionSystem getInstance() { |
| if (instance == null) { |
| synchronized (lock) { |
| if (instance == null) { |
| instance = new ConnectionSystem(); |
| } |
| } |
| } |
| return instance; |
| } |
| |
| private ActorRef createOperationController(ViewContext context) { |
| ActorRef deathWatch = actorSystem.actorOf(Props.create(DeathWatch.class)); |
| return actorSystem.actorOf( |
| Props.create(OperationController.class, actorSystem, deathWatch, context, |
| new ConnectionSupplier(), new DataStorageSupplier(), new HdfsApiSupplier())); |
| } |
| |
| public ActorSystem getActorSystem() { |
| return actorSystem; |
| } |
| |
| /** |
| * Returns one operationController per View Instance |
| * |
| * @param viewContext |
| * @return operationController Instance |
| */ |
| public synchronized ActorRef getOperationController(ViewContext viewContext) { |
| SafeViewContext context = new SafeViewContext(viewContext); |
| String instanceName = context.getInstanceName(); |
| ActorRef ref = null; |
| Map<String, ActorRef> stringActorRefMap = operationControllerMap.get(instanceName); |
| if (stringActorRefMap != null) { |
| ref = stringActorRefMap.get(context.getUsername()); |
| } |
| if (ref == null) { |
| ref = createOperationController(context); |
| if (stringActorRefMap == null) { |
| stringActorRefMap = new HashMap<>(); |
| stringActorRefMap.put(context.getUsername(), ref); |
| operationControllerMap.put(instanceName, stringActorRefMap); |
| } else { |
| stringActorRefMap.put(context.getUsername(), ref); |
| } |
| } |
| return ref; |
| } |
| |
| public synchronized void persistCredentials(String user,String password){ |
| if(!Strings.isNullOrEmpty(password)){ |
| credentialsMap.put(user,password); |
| } |
| } |
| |
| |
| public synchronized Optional<String> getPassword(ViewContext viewContext){ |
| String pass = credentialsMap.get(viewContext.getUsername()); |
| return Optional.fromNullable(pass); |
| } |
| |
| public void removeOperationControllerFromCache(String viewInstanceName) { |
| Map<String, ActorRef> refs = operationControllerMap.remove(viewInstanceName); |
| if (refs != null) { |
| for (ActorRef ref : refs.values()) { |
| Inbox inbox = Inbox.create(getActorSystem()); |
| inbox.send(ref, PoisonPill.getInstance()); |
| } |
| } |
| } |
| |
| public void shutdown() { |
| if (!actorSystem.isTerminated()) { |
| actorSystem.shutdown(); |
| } |
| } |
| } |