| /* |
| * Copyright 2016-present Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.store.primitives.resources.impl; |
| |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| |
| import org.onlab.util.Tools; |
| import org.onosproject.store.service.AsyncAtomicValue; |
| import org.onosproject.store.service.AtomicValueEvent; |
| import org.onosproject.store.service.AtomicValueEventListener; |
| import org.onosproject.store.service.MapEventListener; |
| import org.onosproject.store.service.Versioned; |
| |
| import com.google.common.collect.Sets; |
| |
| /** |
| * Implementation of {@link AsyncAtomicValue} backed by {@link AtomixConsistentMap}. |
| */ |
| public class AtomixValue implements AsyncAtomicValue<String> { |
| |
| private final String name; |
| private final AtomixConsistentMap atomixMap; |
| private MapEventListener<String, byte[]> mapEventListener; |
| private final Set<AtomicValueEventListener<String>> listeners = Sets.newIdentityHashSet(); |
| |
| AtomixValue(String name, AtomixConsistentMap atomixMap) { |
| this.name = name; |
| this.atomixMap = atomixMap; |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> compareAndSet(String expect, String update) { |
| return atomixMap.replace(name, Tools.getBytesUtf8(expect), Tools.getBytesUtf8(update)); |
| } |
| |
| @Override |
| public CompletableFuture<String> get() { |
| return atomixMap.get(name) |
| .thenApply(v -> v != null ? Tools.toStringUtf8(v.value()) : null); |
| } |
| |
| @Override |
| public CompletableFuture<String> getAndSet(String value) { |
| return atomixMap.put(name, Tools.getBytesUtf8(value)) |
| .thenApply(v -> v != null ? Tools.toStringUtf8(v.value()) : null); |
| } |
| |
| @Override |
| public CompletableFuture<Void> set(String value) { |
| return getAndSet(value).thenApply(v -> null); |
| } |
| |
| @Override |
| public CompletableFuture<Void> addListener(AtomicValueEventListener<String> listener) { |
| // TODO: synchronization |
| if (mapEventListener == null) { |
| mapEventListener = event -> { |
| Versioned<byte[]> newValue = event.newValue(); |
| Versioned<byte[]> oldValue = event.oldValue(); |
| if (Objects.equals(event.key(), name)) { |
| listener.event(new AtomicValueEvent<>(name, |
| newValue == null ? null : Tools.toStringUtf8(newValue.value()), |
| oldValue == null ? null : Tools.toStringUtf8(oldValue.value()))); |
| } |
| }; |
| return atomixMap.addListener(mapEventListener).whenComplete((r, e) -> { |
| if (e == null) { |
| listeners.add(listener); |
| } else { |
| mapEventListener = null; |
| } |
| }); |
| } else { |
| listeners.add(listener); |
| return CompletableFuture.completedFuture(null); |
| } |
| } |
| |
| @Override |
| public CompletableFuture<Void> removeListener(AtomicValueEventListener<String> listener) { |
| // TODO: synchronization |
| listeners.remove(listener); |
| if (listeners.isEmpty()) { |
| return atomixMap.removeListener(mapEventListener); |
| } else { |
| return CompletableFuture.completedFuture(null); |
| } |
| } |
| |
| @Override |
| public String name() { |
| return null; |
| } |
| } |