Madan Jampani | 27077eb | 2016-02-22 14:38:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 Open Networking Laboratory |
| 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 static com.google.common.base.Preconditions.checkNotNull; |
| 19 | |
| 20 | import java.util.Collection; |
| 21 | import java.util.Map; |
| 22 | import java.util.TreeMap; |
| 23 | import java.util.concurrent.CompletableFuture; |
| 24 | import java.util.function.Consumer; |
| 25 | |
| 26 | import org.onosproject.cluster.Leadership; |
| 27 | import org.onosproject.cluster.NodeId; |
| 28 | import org.onosproject.cluster.PartitionId; |
| 29 | import org.onosproject.event.Change; |
| 30 | import org.onosproject.store.service.AsyncLeaderElector; |
| 31 | |
| 32 | import com.google.common.collect.Maps; |
| 33 | |
| 34 | /** |
| 35 | * {@link AsyncLeaderElector} that has its topics partitioned horizontally across |
| 36 | * several {@link AsyncLeaderElector leader electors}. |
| 37 | */ |
| 38 | public class PartitionedAsyncLeaderElector implements AsyncLeaderElector { |
| 39 | |
| 40 | private final String name; |
| 41 | private final TreeMap<PartitionId, AsyncLeaderElector> partitions = Maps.newTreeMap(); |
| 42 | private final Hasher<String> topicHasher; |
| 43 | |
| 44 | public PartitionedAsyncLeaderElector(String name, |
| 45 | Map<PartitionId, AsyncLeaderElector> partitions, |
| 46 | Hasher<String> topicHasher) { |
| 47 | this.name = name; |
| 48 | this.partitions.putAll(checkNotNull(partitions)); |
| 49 | this.topicHasher = checkNotNull(topicHasher); |
| 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public String name() { |
| 54 | return name; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public CompletableFuture<Leadership> run(String topic, NodeId nodeId) { |
| 59 | return getLeaderElector(topic).run(topic, nodeId); |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public CompletableFuture<Void> withdraw(String topic) { |
| 64 | return getLeaderElector(topic).withdraw(topic); |
| 65 | } |
| 66 | |
| 67 | @Override |
| 68 | public CompletableFuture<Boolean> anoint(String topic, NodeId nodeId) { |
| 69 | return getLeaderElector(topic).anoint(topic, nodeId); |
| 70 | } |
| 71 | |
| 72 | @Override |
Madan Jampani | 0c0cdc6 | 2016-02-22 16:54:06 -0800 | [diff] [blame] | 73 | public CompletableFuture<Boolean> promote(String topic, NodeId nodeId) { |
| 74 | return getLeaderElector(topic).promote(topic, nodeId); |
| 75 | } |
| 76 | |
| 77 | @Override |
| 78 | public CompletableFuture<Void> evict(NodeId nodeId) { |
| 79 | return CompletableFuture.allOf(getLeaderElectors().stream() |
| 80 | .map(le -> le.evict(nodeId)) |
| 81 | .toArray(CompletableFuture[]::new)); |
| 82 | } |
| 83 | |
| 84 | @Override |
Madan Jampani | 27077eb | 2016-02-22 14:38:32 -0800 | [diff] [blame] | 85 | public CompletableFuture<Leadership> getLeadership(String topic) { |
| 86 | return getLeaderElector(topic).getLeadership(topic); |
| 87 | } |
| 88 | |
| 89 | @Override |
| 90 | public CompletableFuture<Map<String, Leadership>> getLeaderships() { |
| 91 | Map<String, Leadership> leaderships = Maps.newConcurrentMap(); |
| 92 | return CompletableFuture.allOf(getLeaderElectors().stream() |
| 93 | .map(le -> le.getLeaderships() |
| 94 | .thenAccept(m -> leaderships.putAll(m))) |
| 95 | .toArray(CompletableFuture[]::new)) |
| 96 | .thenApply(v -> leaderships); |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public CompletableFuture<Void> addChangeListener(Consumer<Change<Leadership>> listener) { |
| 101 | return CompletableFuture.allOf(getLeaderElectors().stream() |
| 102 | .map(map -> map.addChangeListener(listener)) |
| 103 | .toArray(CompletableFuture[]::new)); |
| 104 | } |
| 105 | |
| 106 | @Override |
| 107 | public CompletableFuture<Void> removeChangeListener(Consumer<Change<Leadership>> listener) { |
| 108 | return CompletableFuture.allOf(getLeaderElectors().stream() |
| 109 | .map(map -> map.removeChangeListener(listener)) |
| 110 | .toArray(CompletableFuture[]::new)); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Returns the leaderElector (partition) to which the specified topic maps. |
| 115 | * @param topic topic name |
| 116 | * @return AsyncLeaderElector to which topic maps |
| 117 | */ |
| 118 | private AsyncLeaderElector getLeaderElector(String topic) { |
| 119 | return partitions.get(topicHasher.hash(topic)); |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Returns all the constituent leader electors. |
| 124 | * @return collection of leader electors. |
| 125 | */ |
| 126 | private Collection<AsyncLeaderElector> getLeaderElectors() { |
| 127 | return partitions.values(); |
| 128 | } |
| 129 | } |