Refactor change: Moved all distributed primitive implementation classes into onos-core-primitives bundle
Change-Id: Icd5dbd4133cb2f21bd403bcd598e6012813e6bfd
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/AsyncCachingConsistentMap.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/AsyncCachingConsistentMap.java
new file mode 100644
index 0000000..9df1b3b
--- /dev/null
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/AsyncCachingConsistentMap.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2015 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.concurrent.CompletableFuture;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.Versioned;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+
+/**
+ * Extension of {@link DefaultAsyncConsistentMap} that provides a weaker read consistency
+ * guarantee in return for better read performance.
+ * <p>
+ * For read/write operations that are local to a node this map implementation provides
+ * guarantees similar to a ConsistentMap. However for read/write operations executed
+ * across multiple nodes this implementation only provides eventual consistency.
+ *
+ * @param <K> key type
+ * @param <V> value type
+ */
+public class AsyncCachingConsistentMap<K, V> extends DefaultAsyncConsistentMap<K, V> {
+
+ private final LoadingCache<K, CompletableFuture<Versioned<V>>> cache =
+ CacheBuilder.newBuilder()
+ .maximumSize(10000) // TODO: make configurable
+ .build(new CacheLoader<K, CompletableFuture<Versioned<V>>>() {
+ @Override
+ public CompletableFuture<Versioned<V>> load(K key)
+ throws Exception {
+ return AsyncCachingConsistentMap.super.get(key);
+ }
+ });
+
+ public AsyncCachingConsistentMap(String name,
+ ApplicationId applicationId,
+ Database database,
+ Serializer serializer,
+ boolean readOnly,
+ boolean purgeOnUninstall,
+ boolean meteringEnabled) {
+ super(name, applicationId, database, serializer, readOnly, purgeOnUninstall, meteringEnabled);
+ addListener(event -> cache.invalidate(event.key()));
+ }
+
+ @Override
+ public CompletableFuture<Versioned<V>> get(K key) {
+ CompletableFuture<Versioned<V>> cachedValue = cache.getIfPresent(key);
+ if (cachedValue != null) {
+ if (cachedValue.isCompletedExceptionally()) {
+ cache.invalidate(key);
+ } else {
+ return cachedValue;
+ }
+ }
+ return cache.getUnchecked(key);
+ }
+
+ @Override
+ protected void beforeUpdate(K key) {
+ super.beforeUpdate(key);
+ cache.invalidate(key);
+ }
+}
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