opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/utils/PrimaryShardInfoFutureCache.java

   1 /*
   2  * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.datastore.utils;
   9
  10 import akka.dispatch.Futures;
  11 import com.google.common.cache.Cache;
  12 import com.google.common.cache.CacheBuilder;
  13 import javax.annotation.Nonnull;
  14 import javax.annotation.Nullable;
  15 import org.opendaylight.controller.cluster.datastore.messages.PrimaryShardInfo;
  16 import scala.concurrent.Future;
  17
  18 /**
  19  * Maintains a cache of PrimaryShardInfo Future instances per shard.
  20  *
  21  * @author Thomas Pantelis
  22  */
  23 public class PrimaryShardInfoFutureCache {
  24     private final Cache<String, Future<PrimaryShardInfo>> primaryShardInfoCache = CacheBuilder.newBuilder().build();
  25
  26     @Nullable
  27     public Future<PrimaryShardInfo> getIfPresent(@Nonnull String shardName) {
  28         return primaryShardInfoCache.getIfPresent(shardName);
  29     }
  30
  31     public void putSuccessful(@Nonnull String shardName, @Nonnull PrimaryShardInfo info) {
  32         primaryShardInfoCache.put(shardName, Futures.successful(info));
  33     }
  34
  35     public void remove(@Nonnull String shardName) {
  36         primaryShardInfoCache.invalidate(shardName);
  37     }
  38 }