Add MXBean to report shard registered DTCL/DCL info
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / jmx / mbeans / shard / OnDemandShardStateCache.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 akka.actor.ActorRef;
11 import akka.pattern.Patterns;
12 import akka.util.Timeout;
13 import com.google.common.base.Preconditions;
14 import com.google.common.base.Stopwatch;
15 import com.google.common.base.Throwables;
16 import com.google.common.cache.Cache;
17 import com.google.common.cache.CacheBuilder;
18 import com.google.common.util.concurrent.ExecutionError;
19 import com.google.common.util.concurrent.UncheckedExecutionException;
20 import java.util.concurrent.ExecutionException;
21 import java.util.concurrent.TimeUnit;
22 import org.opendaylight.controller.cluster.datastore.messages.OnDemandShardState;
23 import org.opendaylight.controller.cluster.raft.client.messages.GetOnDemandRaftState;
24 import scala.concurrent.Await;
25
26 /**
27  * Maintains a short-lived shared cache of OnDemandShardState.
28  *
29  * @author Thomas Pantelis
30  */
31 class OnDemandShardStateCache {
32     private static final Cache<String, OnDemandShardState> ONDEMAND_SHARD_STATE_CACHE =
33             CacheBuilder.newBuilder().expireAfterWrite(2, TimeUnit.SECONDS).build();
34
35     private final ActorRef shardActor;
36     private final String shardName;
37     private volatile String stateRetrievalTime;
38
39     OnDemandShardStateCache(String shardName, ActorRef shardActor) {
40         this.shardName = Preconditions.checkNotNull(shardName);
41         this.shardActor = shardActor;
42     }
43
44     OnDemandShardState get() throws Exception {
45         if (shardActor == null) {
46             return OnDemandShardState.newBuilder().build();
47         }
48
49         try {
50             return ONDEMAND_SHARD_STATE_CACHE.get(shardName, this::retrieveState);
51         } catch (ExecutionException | UncheckedExecutionException | ExecutionError e) {
52             if (e.getCause() != null) {
53                 Throwables.propagateIfPossible(e.getCause(), Exception.class);
54                 throw new RuntimeException("unexpected", e.getCause());
55             }
56
57             throw e;
58         }
59     }
60
61     String getStatRetrievaelTime() {
62         return stateRetrievalTime;
63     }
64
65     private OnDemandShardState retrieveState() throws Exception {
66         stateRetrievalTime = null;
67         Timeout timeout = new Timeout(10, TimeUnit.SECONDS);
68         Stopwatch timer = Stopwatch.createStarted();
69
70         OnDemandShardState state = (OnDemandShardState) Await.result(Patterns.ask(shardActor,
71                 GetOnDemandRaftState.INSTANCE, timeout), timeout.duration());
72
73         stateRetrievalTime = timer.stop().toString();
74         return state;
75     }
76 }

©2013 OpenDaylight, A Linux Foundation Collaborative Project. All Rights Reserved.
OpenDaylight is a registered trademark of The OpenDaylight Project, Inc.
Linux Foundation and OpenDaylight are registered trademarks of the Linux Foundation.
Linux is a registered trademark of Linus Torvalds.