Refactoring to eliminate a split package issue in onos-core-primitives.
Change-Id: I48ff6fe62ae006906674aae1f69e015395f042fc
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixDistributedTopic.java b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixDistributedTopic.java
new file mode 100644
index 0000000..29203a2
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixDistributedTopic.java
@@ -0,0 +1,81 @@
+/*
+ * 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.atomix.primitives.impl;
+
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
+import java.util.function.Consumer;
+
+import com.google.common.collect.Maps;
+import io.atomix.core.value.AsyncAtomicValue;
+import io.atomix.core.value.AtomicValueEventListener;
+import org.onosproject.store.service.DistributedPrimitive;
+import org.onosproject.store.service.Topic;
+
+/**
+ * Default implementation of {@link Topic}.
+ *
+ * @param <T> topic message type.
+ */
+public class AtomixDistributedTopic<T> implements Topic<T> {
+
+ private final AsyncAtomicValue<T> atomixValue;
+ private final Map<Consumer<T>, AtomicValueEventListener<T>> callbacks = Maps.newIdentityHashMap();
+
+ AtomixDistributedTopic(AsyncAtomicValue<T> atomixValue) {
+ this.atomixValue = atomixValue;
+ }
+
+ @Override
+ public String name() {
+ return atomixValue.name();
+ }
+
+ @Override
+ public Type primitiveType() {
+ return DistributedPrimitive.Type.TOPIC;
+ }
+
+ @Override
+ public CompletableFuture<Void> publish(T message) {
+ return atomixValue.set(message);
+ }
+
+ @Override
+ public CompletableFuture<Void> subscribe(Consumer<T> callback, Executor executor) {
+ AtomicValueEventListener<T> valueListener =
+ event -> executor.execute(() -> callback.accept(event.newValue()));
+ if (callbacks.putIfAbsent(callback, valueListener) == null) {
+ return atomixValue.addListener(valueListener);
+ }
+ return CompletableFuture.completedFuture(null);
+ }
+
+ @Override
+ public CompletableFuture<Void> unsubscribe(Consumer<T> callback) {
+ AtomicValueEventListener<T> valueListener = callbacks.remove(callback);
+ if (valueListener != null) {
+ return atomixValue.removeListener(valueListener);
+ }
+ return CompletableFuture.completedFuture(null);
+ }
+
+ @Override
+ public CompletableFuture<Void> destroy() {
+ return atomixValue.close();
+ }
+}