content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.worker.block;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Container for the delta information in each worker-to-master heartbeat.
   */
  @ThreadSafe
  public final class BlockHeartbeatReport {
    /** Map of storage location to a list of blocks ids added in the last heartbeat period. */
    private final Map<BlockStoreLocation, List<Long>> mAddedBlocks;
    /** List of block ids removed in the last heartbeat period. */
    private final List<Long> mRemovedBlocks;
    /**
     * Map of storage tier alias to a list of lost storage paths
     * that were removed in the last heartbeat period.
     */
    private final Map<String, List<String>> mLostStorage;
  
    /**
     * Creates a new instance of {@link BlockHeartbeatReport}.
     *
     * @param addedBlocks added blocks
     * @param removedBlocks remove blocks
     * @param lostStorage lost storage
     */
    public BlockHeartbeatReport(Map<BlockStoreLocation, List<Long>> addedBlocks,
        List<Long> removedBlocks, Map<String, List<String>> lostStorage) {
      mAddedBlocks = new HashMap<>(addedBlocks);
      mRemovedBlocks = new ArrayList<>(removedBlocks);
      mLostStorage = new HashMap<>(lostStorage);
    }
  
    /**
     * Gets the list of blocks added by the worker in the heartbeat this report represents.
     *
     * @return a map from storage location to lists of block ids added
     */
    public Map<BlockStoreLocation, List<Long>> getAddedBlocks() {
      return Collections.unmodifiableMap(mAddedBlocks);
    }
  
    /**
     * Gets the list of blocks removed from this worker in the heartbeat this report represents.
     *
     * @return a list of block ids which have been removed
     */
    public List<Long> getRemovedBlocks() {
      return Collections.unmodifiableList(mRemovedBlocks);
    }
  
    /**
     * Gets the storage paths which were lost
     * in the heartbeat this report represents.
     *
     * @return a map from storage tier alias to lost storage paths
     */
    public Map<String, List<String>> getLostStorage() {
      return Collections.unmodifiableMap(mLostStorage);
    }
  
    /**
     * @return the number of blocks in the report
     */
    public int getBlockChangeCount() {
      int count = mRemovedBlocks.size();
      for (List<Long> blocks: mAddedBlocks.values()) {
        count += blocks.size();
      }
      return count;
    }
  }
  