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

   1 /*
   2  * Copyright (c) 2017 Inocybe Technologies 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.actor.ActorSelection;
  14 import akka.dispatch.Futures;
  15 import akka.pattern.Patterns;
  16 import akka.util.Timeout;
  17 import com.google.common.base.Throwables;
  18 import com.google.common.collect.Streams;
  19 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  20 import java.util.ArrayList;
  21 import java.util.Collection;
  22 import java.util.List;
  23 import java.util.concurrent.TimeUnit;
  24 import java.util.concurrent.TimeoutException;
  25 import java.util.stream.Collectors;
  26 import org.opendaylight.controller.cluster.datastore.jmx.mbeans.shard.ShardDataTreeListenerInfoMXBean;
  27 import org.opendaylight.controller.cluster.datastore.messages.GetInfo;
  28 import org.opendaylight.controller.cluster.datastore.messages.OnDemandShardState;
  29 import org.opendaylight.controller.cluster.mgmt.api.DataTreeListenerInfo;
  30 import org.opendaylight.controller.md.sal.common.util.jmx.AbstractMXBean;
  31 import scala.concurrent.Await;
  32 import scala.concurrent.ExecutionContext;
  33 import scala.concurrent.Future;
  34
  35 /**
  36  * Implementation of ShardDataTreeListenerInfoMXBean.
  37  *
  38  * @author Thomas Pantelis
  39  */
  40 final class ShardDataTreeListenerInfoMXBeanImpl extends AbstractMXBean implements ShardDataTreeListenerInfoMXBean {
  41     private static final String JMX_CATEGORY = "ShardDataTreeListenerInfo";
  42
  43     private final OnDemandShardStateCache stateCache;
  44
  45     ShardDataTreeListenerInfoMXBeanImpl(final String shardName, final String mxBeanType, final ActorRef shardActor) {
  46         super(shardName, mxBeanType, JMX_CATEGORY);
  47         stateCache = new OnDemandShardStateCache(shardName, requireNonNull(shardActor));
  48     }
  49
  50     @Override
  51     public List<DataTreeListenerInfo> getDataTreeChangeListenerInfo() {
  52         return getListenerActorsInfo(getState().getTreeChangeListenerActors());
  53     }
  54
  55     @SuppressWarnings("checkstyle:IllegalCatch")
  56     private OnDemandShardState getState() {
  57         try {
  58             return stateCache.get();
  59         } catch (Exception e) {
  60             Throwables.throwIfUnchecked(e);
  61             throw new RuntimeException(e);
  62         }
  63     }
  64
  65     @SuppressWarnings("checkstyle:IllegalCatch")
  66     @SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "Akka's Await.result() API contract")
  67     private static List<DataTreeListenerInfo> getListenerActorsInfo(final Collection<ActorSelection> actors) {
  68         final Timeout timeout = new Timeout(20, TimeUnit.SECONDS);
  69         final List<Future<Object>> futureList = new ArrayList<>(actors.size());
  70         for (ActorSelection actor: actors) {
  71             futureList.add(Patterns.ask(actor, GetInfo.INSTANCE, timeout));
  72         }
  73
  74         final Iterable<Object> listenerInfos;
  75         try {
  76             listenerInfos = Await.result(Futures.sequence(futureList, ExecutionContext.Implicits$.MODULE$.global()),
  77                 timeout.duration());
  78         } catch (TimeoutException | InterruptedException e) {
  79             throw new IllegalStateException("Failed to acquire listeners", e);
  80         }
  81
  82         return Streams.stream(listenerInfos).map(DataTreeListenerInfo.class::cast).collect(Collectors.toList());
  83     }
  84 }