diff options
author | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:15:21 -0700 |
---|---|---|
committer | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:15:21 -0700 |
commit | 13d05bc8458758ee39cb829098241e89616717ee (patch) | |
tree | 22a4d1ce65f15952f07a3df5af4b462b4697cb3a /framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/AsyncCachingConsistentMap.java | |
parent | 6139282e1e93c2322076de4b91b1c85d0bc4a8b3 (diff) |
ONOS checkin based on commit tag e796610b1f721d02f9b0e213cf6f7790c10ecd60
Change-Id: Ife8810491034fe7becdba75dda20de4267bd15cd
Diffstat (limited to 'framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/AsyncCachingConsistentMap.java')
-rw-r--r-- | framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/AsyncCachingConsistentMap.java | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/AsyncCachingConsistentMap.java b/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/AsyncCachingConsistentMap.java new file mode 100644 index 00000000..7e575b01 --- /dev/null +++ b/framework/src/onos/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/AsyncCachingConsistentMap.java @@ -0,0 +1,71 @@ +/* + * 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.consistent.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 DefaultAsyncConsistentMap that provides a weaker read consistency + * guarantee in return for better read performance. + * + * @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); + } +}
\ No newline at end of file |