Add compatibility functions to AtomicValue/Topic
Change-Id: I4a597cfa3effe0a62714ab12440a2fc41ac58aa9
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TranscodingAsyncAtomicValue.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TranscodingAsyncAtomicValue.java
new file mode 100644
index 0000000..24dd35d
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TranscodingAsyncAtomicValue.java
@@ -0,0 +1,122 @@
+/*
+ * 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));
+ }
+ }
+
+}