State machine implementations for various distributed primitives based on latest Copycat APIs
Change-Id: I622cc196aa1cdf072a5a0b100a5ffaaf71b07900
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixValue.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixValue.java
new file mode 100644
index 0000000..155fe01
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixValue.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2016 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.resources.impl;
+
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+
+import org.onlab.util.Tools;
+import org.onosproject.store.service.AsyncAtomicValue;
+import org.onosproject.store.service.AtomicValueEvent;
+import org.onosproject.store.service.AtomicValueEventListener;
+import org.onosproject.store.service.MapEventListener;
+import org.onosproject.store.service.Versioned;
+
+import com.google.common.collect.Sets;
+
+/**
+ * Implementation of {@link AsyncAtomicValue} backed by {@link AtomixConsistentMap}.
+ */
+public class AtomixValue implements AsyncAtomicValue<String> {
+
+ private final String name;
+ private final AtomixConsistentMap atomixMap;
+ private MapEventListener<String, byte[]> mapEventListener;
+ private final Set<AtomicValueEventListener<String>> listeners = Sets.newIdentityHashSet();
+
+ AtomixValue(String name, AtomixConsistentMap atomixMap) {
+ this.name = name;
+ this.atomixMap = atomixMap;
+ }
+
+ @Override
+ public CompletableFuture<Boolean> compareAndSet(String expect, String update) {
+ return atomixMap.replace(name, Tools.getBytesUtf8(expect), Tools.getBytesUtf8(update));
+ }
+
+ @Override
+ public CompletableFuture<String> get() {
+ return atomixMap.get(name)
+ .thenApply(v -> v != null ? Tools.toStringUtf8(v.value()) : null);
+ }
+
+ @Override
+ public CompletableFuture<String> getAndSet(String value) {
+ return atomixMap.put(name, Tools.getBytesUtf8(value))
+ .thenApply(v -> v != null ? Tools.toStringUtf8(v.value()) : null);
+ }
+
+ @Override
+ public CompletableFuture<Void> set(String value) {
+ return getAndSet(value).thenApply(v -> null);
+ }
+
+ @Override
+ public CompletableFuture<Void> addListener(AtomicValueEventListener<String> listener) {
+ // TODO: synchronization
+ if (mapEventListener == null) {
+ mapEventListener = event -> {
+ Versioned<byte[]> newValue = event.newValue();
+ Versioned<byte[]> oldValue = event.oldValue();
+ if (Objects.equals(event.key(), name)) {
+ listener.event(new AtomicValueEvent<>(name,
+ newValue == null ? null : Tools.toStringUtf8(newValue.value()),
+ oldValue == null ? null : Tools.toStringUtf8(oldValue.value())));
+ }
+ };
+ return atomixMap.addListener(mapEventListener).whenComplete((r, e) -> {
+ if (e == null) {
+ listeners.add(listener);
+ } else {
+ mapEventListener = null;
+ }
+ });
+ } else {
+ listeners.add(listener);
+ return CompletableFuture.completedFuture(null);
+ }
+ }
+
+ @Override
+ public CompletableFuture<Void> removeListener(AtomicValueEventListener<String> listener) {
+ // TODO: synchronization
+ listeners.remove(listener);
+ if (listeners.isEmpty()) {
+ return atomixMap.removeListener(mapEventListener);
+ } else {
+ return CompletableFuture.completedFuture(null);
+ }
+ }
+
+ @Override
+ public String name() {
+ return null;
+ }
+}
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