opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ActorSystemFactory.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.controller.cluster.datastore;
  10
  11 import akka.actor.ActorSystem;
  12 import akka.actor.Props;
  13 import akka.osgi.BundleDelegatingClassLoader;
  14 import com.google.common.base.Preconditions;
  15 import com.typesafe.config.Config;
  16 import com.typesafe.config.ConfigFactory;
  17 import org.osgi.framework.BundleContext;
  18
  19 import java.io.File;
  20
  21 public class ActorSystemFactory {
  22
  23     public static final String AKKA_CONF_PATH = "./configuration/initial/akka.conf";
  24     public static final String ACTOR_SYSTEM_NAME = "opendaylight-cluster-data";
  25     public static final String CONFIGURATION_NAME = "odl-cluster-data";
  26
  27     private static volatile ActorSystem actorSystem = null;
  28
  29     public static final ActorSystem getInstance(){
  30         return actorSystem;
  31     }
  32
  33     /**
  34      * This method should be called only once during initialization
  35      *
  36      * @param bundleContext
  37      */
  38     public static final ActorSystem createInstance(final BundleContext bundleContext) {
  39         if(actorSystem == null) {
  40             // Create an OSGi bundle classloader for actor system
  41             BundleDelegatingClassLoader classLoader = new BundleDelegatingClassLoader(bundleContext.getBundle(),
  42                 Thread.currentThread().getContextClassLoader());
  43             synchronized (ActorSystemFactory.class) {
  44                 // Double check
  45
  46                 if (actorSystem == null) {
  47                     ActorSystem system = ActorSystem.create(ACTOR_SYSTEM_NAME,
  48                         ConfigFactory.load(readAkkaConfiguration()).getConfig(CONFIGURATION_NAME), classLoader);
  49                     system.actorOf(Props.create(TerminationMonitor.class), "termination-monitor");
  50                     actorSystem = system;
  51                 }
  52             }
  53         }
  54
  55         return actorSystem;
  56     }
  57
  58
  59     private static final Config readAkkaConfiguration(){
  60         File defaultConfigFile = new File(AKKA_CONF_PATH);
  61         Preconditions.checkState(defaultConfigFile.exists(), "akka.conf is missing");
  62         return ConfigFactory.parseFile(defaultConfigFile);
  63     }
  64 }