opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/jmx/mbeans/shard/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.jmx.mbeans.shard;
   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 edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  19 import java.util.ArrayList;
  20 import java.util.Collection;
  21 import java.util.List;
  22 import java.util.concurrent.TimeUnit;
  23 import org.opendaylight.controller.cluster.datastore.messages.DataTreeListenerInfo;
  24 import org.opendaylight.controller.cluster.datastore.messages.GetInfo;
  25 import org.opendaylight.controller.cluster.datastore.messages.OnDemandShardState;
  26 import org.opendaylight.controller.md.sal.common.util.jmx.AbstractMXBean;
  27 import scala.concurrent.Await;
  28 import scala.concurrent.ExecutionContext;
  29 import scala.concurrent.Future;
  30
  31 /**
  32  * Implementation of ShardDataTreeListenerInfoMXBean.
  33  *
  34  * @author Thomas Pantelis
  35  */
  36 public class ShardDataTreeListenerInfoMXBeanImpl extends AbstractMXBean implements ShardDataTreeListenerInfoMXBean {
  37     private static final String JMX_CATEGORY = "ShardDataTreeListenerInfo";
  38
  39     private final OnDemandShardStateCache stateCache;
  40
  41     public ShardDataTreeListenerInfoMXBeanImpl(final String shardName, final String mxBeanType,
  42             final ActorRef shardActor) {
  43         super(shardName, mxBeanType, JMX_CATEGORY);
  44         stateCache = new OnDemandShardStateCache(shardName, requireNonNull(shardActor));
  45     }
  46
  47     @Override
  48     public List<DataTreeListenerInfo> getDataTreeChangeListenerInfo() {
  49         return getListenerActorsInfo(getState().getTreeChangeListenerActors());
  50     }
  51
  52     @SuppressWarnings("checkstyle:IllegalCatch")
  53     private OnDemandShardState getState() {
  54         try {
  55             return stateCache.get();
  56         } catch (Exception e) {
  57             Throwables.throwIfUnchecked(e);
  58             throw new RuntimeException(e);
  59         }
  60     }
  61
  62     @SuppressWarnings("checkstyle:IllegalCatch")
  63     @SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "Akka's Await.result() API contract")
  64     private static List<DataTreeListenerInfo> getListenerActorsInfo(final Collection<ActorSelection> actors) {
  65         final Timeout timeout = new Timeout(20, TimeUnit.SECONDS);
  66         final List<Future<Object>> futureList = new ArrayList<>(actors.size());
  67         for (ActorSelection actor: actors) {
  68             futureList.add(Patterns.ask(actor, GetInfo.INSTANCE, timeout));
  69         }
  70
  71         try {
  72             final List<DataTreeListenerInfo> listenerInfoList = new ArrayList<>();
  73             Await.result(Futures.sequence(futureList, ExecutionContext.Implicits$.MODULE$.global()),
  74                     timeout.duration()).forEach(obj -> listenerInfoList.add((DataTreeListenerInfo) obj));
  75             return listenerInfoList;
  76         } catch (Exception e) {
  77             throw new RuntimeException(e);
  78         }
  79     }
  80 }