Distributed topic primitive
Change-Id: Ia3ccd84c33075f297d7e6b9bc205efe92aec9bea
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/DefaultDistributedTopic.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/DefaultDistributedTopic.java
new file mode 100644
index 0000000..df7bf9b
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/DefaultDistributedTopic.java
@@ -0,0 +1,80 @@
+/*
+ * 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 java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+
+import org.onosproject.store.service.AsyncAtomicValue;
+import org.onosproject.store.service.AtomicValueEventListener;
+import org.onosproject.store.service.DistributedPrimitive;
+import org.onosproject.store.service.Topic;
+
+import com.google.common.collect.Maps;
+
+/**
+ * Default implementation of {@link Topic}.
+ *
+ * @param <T> topic message type.
+ */
+public class DefaultDistributedTopic<T> implements Topic<T> {
+
+ private final AsyncAtomicValue<T> atomicValue;
+ private final Map<Consumer<T>, AtomicValueEventListener<T>> callbacks = Maps.newIdentityHashMap();
+
+ DefaultDistributedTopic(AsyncAtomicValue<T> atomicValue) {
+ this.atomicValue = atomicValue;
+ }
+
+ @Override
+ public String name() {
+ return atomicValue.name();
+ }
+
+ @Override
+ public Type primitiveType() {
+ return DistributedPrimitive.Type.TOPIC;
+ }
+
+ @Override
+ public CompletableFuture<Void> destroy() {
+ return atomicValue.destroy();
+ }
+
+ @Override
+ public CompletableFuture<Void> publish(T message) {
+ return atomicValue.set(message);
+ }
+
+ @Override
+ public CompletableFuture<Void> subscribe(Consumer<T> callback) {
+ AtomicValueEventListener<T> valueListener = event -> callback.accept(event.newValue());
+ if (callbacks.putIfAbsent(callback, valueListener) == null) {
+ return atomicValue.addListener(valueListener);
+ }
+ return CompletableFuture.completedFuture(null);
+ }
+
+ @Override
+ public CompletableFuture<Void> unsubscribe(Consumer<T> callback) {
+ AtomicValueEventListener<T> valueListener = callbacks.remove(callback);
+ if (valueListener != null) {
+ return atomicValue.removeListener(valueListener);
+ }
+ return CompletableFuture.completedFuture(null);
+ }
+}
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java
index bc699d5..7658793 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/StorageManager.java
@@ -41,6 +41,7 @@
import org.onosproject.store.primitives.PartitionService;
import org.onosproject.store.primitives.TransactionId;
import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.AsyncAtomicValue;
import org.onosproject.store.service.AsyncConsistentMap;
import org.onosproject.store.service.AtomicCounterBuilder;
import org.onosproject.store.service.AtomicValueBuilder;
@@ -54,6 +55,7 @@
import org.onosproject.store.service.Serializer;
import org.onosproject.store.service.StorageAdminService;
import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Topic;
import org.onosproject.store.service.TransactionContextBuilder;
import org.onosproject.store.service.WorkQueue;
import org.onosproject.store.service.WorkQueueStats;
@@ -217,4 +219,13 @@
return new MapInfo(name, map.size());
}).collect(Collectors.toList());
}
+
+ @Override
+ public <T> Topic<T> getTopic(String name, Serializer serializer) {
+ AsyncAtomicValue<T> atomicValue = this.<T>atomicValueBuilder()
+ .withName("topic-" + name)
+ .withSerializer(serializer)
+ .build();
+ return new DefaultDistributedTopic<>(atomicValue);
+ }
}