opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DataTreeCohortRegistrationProxy.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.datastore;
   9
  10 import akka.actor.ActorRef;
  11 import akka.dispatch.OnComplete;
  12 import akka.pattern.Patterns;
  13 import akka.util.Timeout;
  14 import com.google.common.base.Preconditions;
  15 import java.util.concurrent.TimeUnit;
  16 import javax.annotation.concurrent.GuardedBy;
  17 import org.opendaylight.controller.cluster.datastore.exceptions.LocalShardNotFoundException;
  18 import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
  19 import org.opendaylight.mdsal.dom.api.DOMDataTreeCommitCohort;
  20 import org.opendaylight.mdsal.dom.api.DOMDataTreeCommitCohortRegistration;
  21 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  22 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25 import scala.concurrent.Future;
  26 import scala.concurrent.duration.FiniteDuration;
  27
  28 public class DataTreeCohortRegistrationProxy<C extends DOMDataTreeCommitCohort> extends AbstractObjectRegistration<C>
  29         implements DOMDataTreeCommitCohortRegistration<C> {
  30
  31     private static final Logger LOG = LoggerFactory.getLogger(DataTreeCohortRegistrationProxy.class);
  32     private static final Timeout TIMEOUT = new Timeout(new FiniteDuration(5, TimeUnit.SECONDS));
  33     private final DOMDataTreeIdentifier subtree;
  34     private final ActorRef actor;
  35     private final ActorContext actorContext;
  36     @GuardedBy("this")
  37     private ActorRef cohortRegistry;
  38
  39     DataTreeCohortRegistrationProxy(final ActorContext actorContext, final DOMDataTreeIdentifier subtree,
  40             final C cohort) {
  41         super(cohort);
  42         this.subtree = Preconditions.checkNotNull(subtree);
  43         this.actorContext = Preconditions.checkNotNull(actorContext);
  44         this.actor = actorContext.getActorSystem().actorOf(DataTreeCohortActor.props(getInstance(),
  45                 subtree.getRootIdentifier()).withDispatcher(actorContext.getNotificationDispatcherPath()));
  46     }
  47
  48     public void init(final String shardName) {
  49         // FIXME: Add late binding to shard.
  50         Future<ActorRef> findFuture = actorContext.findLocalShardAsync(shardName);
  51         findFuture.onComplete(new OnComplete<ActorRef>() {
  52             @Override
  53             public void onComplete(final Throwable failure, final ActorRef shard) {
  54                 if (failure instanceof LocalShardNotFoundException) {
  55                     LOG.debug("No local shard found for {} - DataTreeChangeListener {} at path {} "
  56                             + "cannot be registered", shardName, getInstance(), subtree);
  57                 } else if (failure != null) {
  58                     LOG.error("Failed to find local shard {} - DataTreeChangeListener {} at path {} "
  59                             + "cannot be registered", shardName, getInstance(), subtree, failure);
  60                 } else {
  61                     performRegistration(shard);
  62                 }
  63             }
  64         }, actorContext.getClientDispatcher());
  65     }
  66
  67     private synchronized void performRegistration(final ActorRef shard) {
  68         if (isClosed()) {
  69             return;
  70         }
  71         cohortRegistry = shard;
  72         Future<Object> future =
  73                 Patterns.ask(shard, new DataTreeCohortActorRegistry.RegisterCohort(subtree, actor), TIMEOUT);
  74         future.onComplete(new OnComplete<Object>() {
  75
  76             @Override
  77             public void onComplete(final Throwable failure, final Object val) {
  78                 if (failure != null) {
  79                     LOG.error("Unable to register {} as commit cohort", getInstance(), failure);
  80                 }
  81                 if (isClosed()) {
  82                     removeRegistration();
  83                 }
  84             }
  85
  86         }, actorContext.getClientDispatcher());
  87     }
  88
  89     @Override
  90     protected synchronized void removeRegistration() {
  91         if (cohortRegistry != null) {
  92             cohortRegistry.tell(new DataTreeCohortActorRegistry.RemoveCohort(actor), ActorRef.noSender());
  93         }
  94     }
  95 }