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 alluxio.heartbeat.HeartbeatExecutor;
  import alluxio.worker.file.FileSystemMasterClient;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.Set;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * PinListSync periodically syncs the set of pinned inodes from master,  and saves the new pinned
   * inodes to the {@link BlockWorker}.
   *
   */
  @NotThreadSafe
  public final class PinListSync implements HeartbeatExecutor {
    private static final Logger LOG = LoggerFactory.getLogger(PinListSync.class);
  
    /** Block worker handle responsible for interacting with Alluxio and UFS storage. */
    private final BlockWorker mBlockWorker;
  
    /** Client for all master communication. */
    private final FileSystemMasterClient mMasterClient;
  
    /**
     * Creates a new instance of {@link PinListSync}.
     *
     * @param blockWorker the block worker handle
     * @param masterClient the Alluxio master client
     */
    public PinListSync(BlockWorker blockWorker, FileSystemMasterClient masterClient) {
      mBlockWorker = blockWorker;
      mMasterClient = masterClient;
    }
  
    @Override
    public void heartbeat(long timeLimitMs) {
      // Send the sync
      try {
        Set<Long> pinList = mMasterClient.getPinList();
        mBlockWorker.updatePinList(pinList);
      } catch (Exception e) {
        // An error occurred, retry after 1 second or error if sync timeout is reached
        LOG.warn("Failed to receive pinlist: {}", e.toString());
        LOG.debug("Exception: ", e);
        // TODO(gene): Add this method to AbstractMasterClient.
        // mMasterClient.resetConnection();
      }
    }
  
    @Override
    public void close() {
      // Nothing to clean up
    }
  }
  