| /* |
| * Copyright 2018-present Open Networking Foundation |
| * |
| * 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 java.util.Collection; |
| import java.util.Map; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.function.Consumer; |
| import java.util.function.Function; |
| |
| import com.google.common.collect.Maps; |
| import org.onosproject.store.service.AsyncAtomicValue; |
| import org.onosproject.store.service.AtomicValueEvent; |
| import org.onosproject.store.service.AtomicValueEventListener; |
| |
| /** |
| * An {@code AsyncAtomicValue} that transcodes values. |
| */ |
| public class TranscodingAsyncAtomicValue<V1, V2> implements AsyncAtomicValue<V1> { |
| private final AsyncAtomicValue<V2> backingValue; |
| private final Function<V1, V2> valueEncoder; |
| private final Function<V2, V1> valueDecoder; |
| private final Map<AtomicValueEventListener<V1>, InternalValueEventListener> listeners = Maps.newIdentityHashMap(); |
| |
| public TranscodingAsyncAtomicValue( |
| AsyncAtomicValue<V2> backingValue, Function<V1, V2> valueEncoder, Function<V2, V1> valueDecoder) { |
| this.backingValue = backingValue; |
| this.valueEncoder = k -> k == null ? null : valueEncoder.apply(k); |
| this.valueDecoder = k -> k == null ? null : valueDecoder.apply(k); |
| } |
| |
| @Override |
| public String name() { |
| return backingValue.name(); |
| } |
| |
| @Override |
| public CompletableFuture<Boolean> compareAndSet(V1 expect, V1 update) { |
| return backingValue.compareAndSet(valueEncoder.apply(expect), valueEncoder.apply(update)); |
| } |
| |
| @Override |
| public CompletableFuture<V1> get() { |
| return backingValue.get().thenApply(valueDecoder); |
| } |
| |
| @Override |
| public CompletableFuture<V1> getAndSet(V1 value) { |
| return backingValue.getAndSet(valueEncoder.apply(value)).thenApply(valueDecoder); |
| } |
| |
| @Override |
| public CompletableFuture<Void> set(V1 value) { |
| return backingValue.set(valueEncoder.apply(value)); |
| } |
| |
| @Override |
| public CompletableFuture<Void> addListener(AtomicValueEventListener<V1> listener) { |
| synchronized (listeners) { |
| InternalValueEventListener backingMapListener = |
| listeners.computeIfAbsent(listener, k -> new InternalValueEventListener(listener)); |
| return backingValue.addListener(backingMapListener); |
| } |
| } |
| |
| @Override |
| public CompletableFuture<Void> removeListener(AtomicValueEventListener<V1> listener) { |
| synchronized (listeners) { |
| InternalValueEventListener backingMapListener = listeners.remove(listener); |
| if (backingMapListener != null) { |
| return backingValue.removeListener(backingMapListener); |
| } else { |
| return CompletableFuture.completedFuture(null); |
| } |
| } |
| } |
| |
| @Override |
| public void addStatusChangeListener(Consumer<Status> listener) { |
| backingValue.addStatusChangeListener(listener); |
| } |
| |
| @Override |
| public void removeStatusChangeListener(Consumer<Status> listener) { |
| backingValue.removeStatusChangeListener(listener); |
| } |
| |
| @Override |
| public Collection<Consumer<Status>> statusChangeListeners() { |
| return backingValue.statusChangeListeners(); |
| } |
| |
| private class InternalValueEventListener implements AtomicValueEventListener<V2> { |
| private final AtomicValueEventListener<V1> listener; |
| |
| InternalValueEventListener(AtomicValueEventListener<V1> listener) { |
| this.listener = listener; |
| } |
| |
| @Override |
| public void event(AtomicValueEvent<V2> event) { |
| listener.event(new AtomicValueEvent<>( |
| event.name(), |
| event.newValue() != null ? valueDecoder.apply(event.newValue()) : null, |
| event.oldValue() != null ? valueDecoder.apply(event.oldValue()) : null)); |
| } |
| } |
| |
| } |