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.master.meta;
  
  import alluxio.ProjectConstants;
  import alluxio.check.UpdateCheck;
  import alluxio.heartbeat.HeartbeatExecutor;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.List;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * Periodically Alluxio version update check.
   */
  @NotThreadSafe
  public final class UpdateChecker implements HeartbeatExecutor {
    private static final Logger LOG = LoggerFactory.getLogger(UpdateChecker.class);
    private static final String NUM_WORKER_INFO_FORMAT = "numWorkers:%s";
  
    private final MetaMaster mMetaMaster;
  
    /**
     * Creates a new instance of {@link UpdateChecker}.
     *
     * @param metaMaster the meta master
     */
    public UpdateChecker(DefaultMetaMaster metaMaster) {
      mMetaMaster = metaMaster;
    }
  
    /**
     * Heartbeat for the periodic update check.
     */
    @Override
    public void heartbeat(long timeLimitMs) {
      try {
        List<String> additionalInfo = new ArrayList<>();
        int clusterSize = mMetaMaster.getWorkerAddresses().size();
        additionalInfo.add(String.format(NUM_WORKER_INFO_FORMAT,
            // TODO(lu) use -1 here since we cannot distinguish
            // no worker vs cluster not ready (still registering) cases
            clusterSize > 0 ? clusterSize : -1));
        String latestVersion =
            UpdateCheck.getLatestVersion(mMetaMaster.getClusterID(), additionalInfo,
                3000, 3000, 3000);
        if (!ProjectConstants.VERSION.equals(latestVersion)) {
          LOG.info("The latest version (" + latestVersion + ") is not the same "
              + "as the current version (" + ProjectConstants.VERSION + "). To upgrade "
              + "visit https://www.alluxio.io/download/.");
          mMetaMaster.setNewerVersionAvailable(true);
        }
      } catch (Throwable t) {
        LOG.debug("Unable to check for updates:", t);
      }
    }
  
    @Override
    public void close() {}
  }
  