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