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 static java.util.Objects.requireNonNull;
  11
  12 import akka.actor.ActorRef;
  13 import akka.dispatch.OnComplete;
  14 import akka.pattern.Patterns;
  15 import akka.util.Timeout;
  16 import java.util.concurrent.TimeUnit;
  17 import org.checkerframework.checker.lock.qual.GuardedBy;
  18 import org.opendaylight.controller.cluster.datastore.exceptions.LocalShardNotFoundException;
  19 import org.opendaylight.controller.cluster.datastore.utils.ActorUtils;
  20 import org.opendaylight.mdsal.dom.api.DOMDataTreeCommitCohort;
  21 import org.opendaylight.mdsal.dom.api.DOMDataTreeCommitCohortRegistration;
  22 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  23 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26 import scala.concurrent.Future;
  27 import scala.concurrent.duration.FiniteDuration;
  28
  29 public class DataTreeCohortRegistrationProxy<C extends DOMDataTreeCommitCohort> extends AbstractObjectRegistration<C>
  30         implements DOMDataTreeCommitCohortRegistration<C> {
  31
  32     private static final Logger LOG = LoggerFactory.getLogger(DataTreeCohortRegistrationProxy.class);
  33     private static final Timeout TIMEOUT = new Timeout(new FiniteDuration(5, TimeUnit.SECONDS));
  34     private final DOMDataTreeIdentifier subtree;
  35     private final ActorRef actor;
  36     private final ActorUtils actorUtils;
  37     @GuardedBy("this")
  38     private ActorRef cohortRegistry;
  39
  40     DataTreeCohortRegistrationProxy(final ActorUtils actorUtils, final DOMDataTreeIdentifier subtree,
  41             final C cohort) {
  42         super(cohort);
  43         this.subtree = requireNonNull(subtree);
  44         this.actorUtils = requireNonNull(actorUtils);
  45         this.actor = actorUtils.getActorSystem().actorOf(DataTreeCohortActor.props(getInstance(),
  46                 subtree.getRootIdentifier()).withDispatcher(actorUtils.getNotificationDispatcherPath()));
  47     }
  48
  49     public void init(final String shardName) {
  50         // FIXME: Add late binding to shard.
  51         Future<ActorRef> findFuture = actorUtils.findLocalShardAsync(shardName);
  52         findFuture.onComplete(new OnComplete<ActorRef>() {
  53             @Override
  54             public void onComplete(final Throwable failure, final ActorRef shard) {
  55                 if (failure instanceof LocalShardNotFoundException) {
  56                     LOG.debug("No local shard found for {} - DataTreeChangeListener {} at path {} "
  57                             + "cannot be registered", shardName, getInstance(), subtree);
  58                 } else if (failure != null) {
  59                     LOG.error("Failed to find local shard {} - DataTreeChangeListener {} at path {} "
  60                             + "cannot be registered", shardName, getInstance(), subtree, failure);
  61                 } else {
  62                     performRegistration(shard);
  63                 }
  64             }
  65         }, actorUtils.getClientDispatcher());
  66     }
  67
  68     private synchronized void performRegistration(final ActorRef shard) {
  69         if (isClosed()) {
  70             return;
  71         }
  72         cohortRegistry = shard;
  73         Future<Object> future =
  74                 Patterns.ask(shard, new DataTreeCohortActorRegistry.RegisterCohort(subtree, actor), TIMEOUT);
  75         future.onComplete(new OnComplete<>() {
  76
  77             @Override
  78             public void onComplete(final Throwable failure, final Object val) {
  79                 if (failure != null) {
  80                     LOG.error("Unable to register {} as commit cohort", getInstance(), failure);
  81                 }
  82                 if (isClosed()) {
  83                     removeRegistration();
  84                 }
  85             }
  86
  87         }, actorUtils.getClientDispatcher());
  88     }
  89
  90     @Override
  91     protected synchronized void removeRegistration() {
  92         if (cohortRegistry != null) {
  93             cohortRegistry.tell(new DataTreeCohortActorRegistry.RemoveCohort(actor), ActorRef.noSender());
  94         }
  95     }
  96 }