Jordan Halterman | af35f7a | 2018-01-24 16:46:55 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.store.primitives.impl; |
| 17 | |
| 18 | import java.util.concurrent.CompletableFuture; |
| 19 | import java.util.function.Consumer; |
| 20 | |
| 21 | import com.google.common.cache.CacheBuilder; |
| 22 | import com.google.common.cache.CacheLoader; |
| 23 | import com.google.common.cache.LoadingCache; |
| 24 | import org.onosproject.cluster.Leadership; |
| 25 | import org.onosproject.cluster.NodeId; |
| 26 | import org.onosproject.event.Change; |
| 27 | import org.onosproject.store.service.AsyncLeaderElector; |
| 28 | |
| 29 | /** |
| 30 | * Caching async leader elector. |
| 31 | */ |
| 32 | public class CachingAsyncLeaderElector extends DelegatingAsyncLeaderElector { |
| 33 | private final LoadingCache<String, CompletableFuture<Leadership>> cache; |
| 34 | private final Consumer<Change<Leadership>> cacheUpdater; |
| 35 | private final Consumer<Status> statusListener; |
| 36 | |
| 37 | public CachingAsyncLeaderElector(AsyncLeaderElector delegateLeaderElector) { |
| 38 | super(delegateLeaderElector); |
| 39 | cache = CacheBuilder.newBuilder() |
| 40 | .maximumSize(1000) |
| 41 | .build(CacheLoader.from(super::getLeadership)); |
| 42 | |
| 43 | cacheUpdater = change -> { |
| 44 | Leadership leadership = change.newValue(); |
| 45 | cache.put(leadership.topic(), CompletableFuture.completedFuture(leadership)); |
| 46 | }; |
| 47 | statusListener = status -> { |
| 48 | if (status == Status.SUSPENDED || status == Status.INACTIVE) { |
| 49 | cache.invalidateAll(); |
| 50 | } |
| 51 | }; |
| 52 | addChangeListener(cacheUpdater); |
| 53 | addStatusChangeListener(statusListener); |
| 54 | } |
| 55 | |
| 56 | @Override |
| 57 | public CompletableFuture<Leadership> getLeadership(String topic) { |
| 58 | return cache.getUnchecked(topic) |
| 59 | .whenComplete((r, e) -> { |
| 60 | if (e != null) { |
| 61 | cache.invalidate(topic); |
| 62 | } |
| 63 | }); |
| 64 | } |
| 65 | |
| 66 | @Override |
| 67 | public CompletableFuture<Leadership> run(String topic, NodeId nodeId) { |
| 68 | return super.run(topic, nodeId).whenComplete((r, e) -> cache.invalidate(topic)); |
| 69 | } |
| 70 | |
| 71 | @Override |
| 72 | public CompletableFuture<Void> withdraw(String topic) { |
| 73 | return super.withdraw(topic).whenComplete((r, e) -> cache.invalidate(topic)); |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public CompletableFuture<Boolean> anoint(String topic, NodeId nodeId) { |
| 78 | return super.anoint(topic, nodeId).whenComplete((r, e) -> cache.invalidate(topic)); |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public CompletableFuture<Boolean> promote(String topic, NodeId nodeId) { |
| 83 | return super.promote(topic, nodeId).whenComplete((r, e) -> cache.invalidate(topic)); |
| 84 | } |
| 85 | |
| 86 | @Override |
| 87 | public CompletableFuture<Void> evict(NodeId nodeId) { |
| 88 | return super.evict(nodeId).whenComplete((r, e) -> cache.invalidateAll()); |
| 89 | } |
| 90 | |
| 91 | @Override |
| 92 | public CompletableFuture<Void> destroy() { |
| 93 | removeStatusChangeListener(statusListener); |
| 94 | return removeChangeListener(cacheUpdater); |
| 95 | } |
| 96 | } |