opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/databroker/actors/dds/DistributedDataStoreClientActor.java

   1 /*
   2  * Copyright (c) 2016 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 package org.opendaylight.controller.cluster.databroker.actors.dds;
   9
  10 import akka.actor.ActorRef;
  11 import akka.actor.Props;
  12 import akka.pattern.ExplicitAskSupport;
  13 import akka.util.Timeout;
  14 import com.google.common.base.Preconditions;
  15 import com.google.common.base.Throwables;
  16 import java.util.concurrent.TimeUnit;
  17 import javax.annotation.Nonnull;
  18 import org.opendaylight.controller.cluster.access.client.AbstractClientActor;
  19 import org.opendaylight.controller.cluster.access.client.ClientActorContext;
  20 import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
  21 import org.opendaylight.controller.cluster.access.concepts.FrontendType;
  22 import org.opendaylight.controller.cluster.access.concepts.MemberName;
  23 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  24 import scala.Function1;
  25 import scala.concurrent.Await;
  26 import scala.concurrent.duration.Duration;
  27 import scala.runtime.AbstractFunction1;
  28
  29 /**
  30  * A {@link AbstractClientActor} which acts as the point of contact for DistributedDataStore.
  31  *
  32  * @author Robert Varga
  33  */
  34 public final class DistributedDataStoreClientActor extends AbstractClientActor {
  35     // Unfortunately Akka's explicit ask pattern does not work with its Java API, as it fails to invoke passed message.
  36     // In order to make this work for now, we tap directly into ExplicitAskSupport and use a Scala function instead
  37     // of akka.japi.Function.
  38     private static final ExplicitAskSupport ASK_SUPPORT = akka.pattern.extended.package$.MODULE$;
  39     private static final Function1<ActorRef, Object> GET_CLIENT_FACTORY = new AbstractFunction1<ActorRef, Object>() {
  40         @Override
  41         public Object apply(final ActorRef askSender) {
  42             return new GetClientRequest(askSender);
  43         }
  44     };
  45
  46     private final ActorContext actorContext;
  47
  48     private DistributedDataStoreClientActor(final FrontendIdentifier frontendId, final ActorContext actorContext) {
  49         super(frontendId);
  50         this.actorContext = Preconditions.checkNotNull(actorContext);
  51     }
  52
  53     @Override
  54     protected DistributedDataStoreClientBehavior initialBehavior(final ClientActorContext context) {
  55         return new DistributedDataStoreClientBehavior(context, actorContext);
  56     }
  57
  58     public static Props props(final @Nonnull MemberName memberName, @Nonnull final String storeName, final ActorContext ctx) {
  59         final String name = "datastore-" + storeName;
  60         final FrontendIdentifier frontendId = FrontendIdentifier.create(memberName, FrontendType.forName(name));
  61         return Props.create(DistributedDataStoreClientActor.class,
  62             () -> new DistributedDataStoreClientActor(frontendId, ctx));
  63     }
  64
  65     public static DistributedDataStoreClient getDistributedDataStoreClient(final @Nonnull ActorRef actor,
  66             final long timeout, final TimeUnit unit) {
  67         try {
  68             return (DistributedDataStoreClient) Await.result(ASK_SUPPORT.ask(actor, GET_CLIENT_FACTORY,
  69                 Timeout.apply(timeout, unit)), Duration.Inf());
  70         } catch (Exception e) {
  71             throw Throwables.propagate(e);
  72         }
  73     }
  74 }