content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.bookkeeper.clients.impl.container;
  
  import com.google.common.collect.Maps;
  import java.util.Map;
  import javax.annotation.Nullable;
  import javax.annotation.concurrent.GuardedBy;
  import lombok.extern.slf4j.Slf4j;
  
  /**
   * A manager manages the mapping between storage containers and range servers.
   */
  @Slf4j
  public class StorageContainerManager implements AutoCloseable {
  
      @GuardedBy("storageContainers")
      private final Map<Long, StorageContainerInfo> storageContainers;
  
      public StorageContainerManager() {
          this.storageContainers = Maps.newHashMap();
      }
  
      @Nullable
      public StorageContainerInfo getStorageContainer(long groupId) {
          synchronized (storageContainers) {
              return this.storageContainers.get(groupId);
          }
      }
  
      public boolean replaceStorageContainer(long groupId, StorageContainerInfo groupInfo) {
          synchronized (storageContainers) {
              StorageContainerInfo oldGroupInfo = storageContainers.get(groupId);
              if (null == oldGroupInfo || oldGroupInfo.getRevision() < groupInfo.getRevision()) {
                  log.info("Updated the storage container info for group {} : {}", groupId, groupInfo);
                  storageContainers.put(groupId, groupInfo);
                  return true;
              }
              return false;
          }
      }
  
      public void removeStorageContainer(long groupId) {
          synchronized (storageContainers) {
              storageContainers.remove(groupId);
          }
      }
  
      @Override
      public void close() {
          synchronized (storageContainers) {
              storageContainers.clear();
          }
      }
  }
  