| /* |
| * 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.impl; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.util.Map; |
| import java.util.concurrent.CompletableFuture; |
| |
| import org.onosproject.store.service.AsyncAtomicValue; |
| import org.onosproject.store.service.AsyncConsistentMap; |
| import org.onosproject.store.service.AtomicValueEvent; |
| import org.onosproject.store.service.AtomicValueEventListener; |
| import org.onosproject.store.service.MapEvent; |
| import org.onosproject.store.service.MapEventListener; |
| import org.onosproject.store.service.Serializer; |
| import org.onosproject.store.service.Versioned; |
| |
| import com.google.common.base.Throwables; |
| import com.google.common.collect.Maps; |
| import org.onosproject.utils.MeteringAgent; |
| |
| /** |
| * Default implementation of a {@code AsyncAtomicValue}. |
| * |
| * @param <V> value type |
| */ |
| public class DefaultAsyncAtomicValue<V> implements AsyncAtomicValue<V> { |
| |
| private final String name; |
| private final Serializer serializer; |
| private final AsyncConsistentMap<String, byte[]> backingMap; |
| private final Map<AtomicValueEventListener<V>, MapEventListener<String, byte[]>> listeners = |
| Maps.newIdentityHashMap(); |
| private final MeteringAgent monitor; |
| |
| private static final String COMPONENT_NAME = "atomicValue"; |
| private static final String GET = "get"; |
| private static final String GET_AND_SET = "getAndSet"; |
| private static final String SET = "set"; |
| private static final String COMPARE_AND_SET = "compareAndSet"; |
| private static final String ADD_LISTENER = "addListener"; |
| private static final String REMOVE_LISTENER = "removeListener"; |
| private static final String NOTIFY_LISTENER = "notifyListener"; |
| |
| public DefaultAsyncAtomicValue(String name, Serializer serializer, AsyncConsistentMap<String, byte[]> backingMap) { |
| this.name = checkNotNull(name, "name must not be null"); |
| this.serializer = checkNotNull(serializer, "serializer must not be null"); |
| this.backingMap = checkNotNull(backingMap, "backingMap must not be null"); |
| this.monitor = new MeteringAgent(COMPONENT_NAME, name, true); |
| } |
| |
| @Override |
| public String name() { |
| return name; |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> compareAndSet(V expect, V update) { |
| final MeteringAgent.Context newTimer = monitor.startTimer(COMPARE_AND_SET); |
| return backingMap.replace(name, serializer.encode(expect), serializer.encode(update)) |
| .whenComplete((r, e) -> newTimer.stop(e)); |
| } |
| |
| @Override |
| public CompletableFuture<V> get() { |
| final MeteringAgent.Context newTimer = monitor.startTimer(GET); |
| return backingMap.get(name) |
| .thenApply(Versioned::valueOrNull) |
| .thenApply(v -> v == null ? null : serializer.<V>decode(v)) |
| .whenComplete((r, e) -> newTimer.stop(e)); |
| } |
| |
| @Override |
| public CompletableFuture<V> getAndSet(V value) { |
| final MeteringAgent.Context newTimer = monitor.startTimer(GET_AND_SET); |
| if (value == null) { |
| return backingMap.remove(name) |
| .thenApply(Versioned::valueOrNull) |
| .thenApply(v -> v == null ? null : serializer.<V>decode(v)) |
| .whenComplete((r, e) -> newTimer.stop(e)); |
| } |
| return backingMap.put(name, serializer.encode(value)) |
| .thenApply(Versioned::valueOrNull) |
| .thenApply(v -> v == null ? null : serializer.<V>decode(v)) |
| .whenComplete((r, e) -> newTimer.stop(e)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> set(V value) { |
| final MeteringAgent.Context newTimer = monitor.startTimer(SET); |
| if (value == null) { |
| return backingMap.remove(name) |
| .whenComplete((r, e) -> newTimer.stop(e)) |
| .thenApply(v -> null); |
| |
| } |
| return backingMap.put(name, serializer.encode(value)) |
| .whenComplete((r, e) -> newTimer.stop(e)) |
| .thenApply(v -> null); |
| } |
| |
| @Override |
| public CompletableFuture<Void> addListener(AtomicValueEventListener<V> listener) { |
| checkNotNull(listener, "listener must not be null"); |
| final MeteringAgent.Context newTimer = monitor.startTimer(ADD_LISTENER); |
| MapEventListener<String, byte[]> mapListener = |
| listeners.computeIfAbsent(listener, key -> new InternalMapValueEventListener(listener)); |
| return backingMap.addListener(mapListener).whenComplete((r, e) -> newTimer.stop(e)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> removeListener(AtomicValueEventListener<V> listener) { |
| checkNotNull(listener, "listener must not be null"); |
| final MeteringAgent.Context newTimer = monitor.startTimer(REMOVE_LISTENER); |
| MapEventListener<String, byte[]> mapListener = listeners.remove(listener); |
| if (mapListener != null) { |
| return backingMap.removeListener(mapListener) |
| .whenComplete((r, e) -> newTimer.stop(e)); |
| } else { |
| newTimer.stop(null); |
| return CompletableFuture.completedFuture(null); |
| } |
| } |
| |
| private class InternalMapValueEventListener implements MapEventListener<String, byte[]> { |
| |
| private final AtomicValueEventListener<V> listener; |
| |
| InternalMapValueEventListener(AtomicValueEventListener<V> listener) { |
| this.listener = listener; |
| } |
| |
| @Override |
| public void event(MapEvent<String, byte[]> event) { |
| if (event.key().equals(name)) { |
| final MeteringAgent.Context newTimer = monitor.startTimer(NOTIFY_LISTENER); |
| byte[] rawNewValue = Versioned.valueOrNull(event.newValue()); |
| byte[] rawOldValue = Versioned.valueOrNull(event.oldValue()); |
| try { |
| listener.event(new AtomicValueEvent<>(name, |
| rawNewValue == null ? null : serializer.decode(rawNewValue), |
| rawOldValue == null ? null : serializer.decode(rawOldValue))); |
| newTimer.stop(null); |
| } catch (Exception e) { |
| newTimer.stop(e); |
| Throwables.propagate(e); |
| } |
| } |
| } |
| } |
| } |