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.AbstractJobMasterClient;
  import alluxio.Constants;
  import alluxio.RuntimeConstants;
  import alluxio.exception.status.AlluxioStatusException;
  import alluxio.grpc.BuildVersion;
  import alluxio.grpc.GetJobMasterIdPRequest;
  import alluxio.grpc.JobMasterHeartbeatPOptions;
  import alluxio.grpc.JobMasterHeartbeatPRequest;
  import alluxio.grpc.JobMasterMasterServiceGrpc;
  import alluxio.grpc.JobMasterMetaCommand;
  import alluxio.grpc.RegisterJobMasterPOptions;
  import alluxio.grpc.RegisterJobMasterPRequest;
  import alluxio.grpc.ServiceType;
  import alluxio.metrics.MetricKey;
  import alluxio.metrics.MetricsSystem;
  import alluxio.wire.Address;
  import alluxio.worker.job.JobMasterClientContext;
  
  import com.codahale.metrics.Gauge;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Map;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * A wrapper for the gRPC client to interact with the primary job master,
   * used by Alluxio standby job masters.
   */
  @ThreadSafe
  public final class RetryHandlingJobMasterMasterClient extends AbstractJobMasterClient {
    private static final Logger LOG =
            LoggerFactory.getLogger(RetryHandlingJobMasterMasterClient.class);
    private JobMasterMasterServiceGrpc.JobMasterMasterServiceBlockingStub mClient = null;
  
    /**
     * Creates a instance of {@link RetryHandlingJobMasterMasterClient}.
     *
     * @param conf master client configuration
     */
    public RetryHandlingJobMasterMasterClient(JobMasterClientContext conf) {
      super(conf);
    }
  
    @Override
    public void connect() throws AlluxioStatusException {
      super.connect();
    }
  
    @Override
    protected ServiceType getRemoteServiceType() {
      return ServiceType.JOB_MASTER_MASTER_SERVICE;
    }
  
    @Override
    protected String getServiceName() {
      return Constants.JOB_MASTER_MASTER_SERVICE_NAME;
    }
  
    @Override
    protected long getServiceVersion() {
      return Constants.JOB_MASTER_MASTER_SERVICE_VERSION;
    }
  
    @Override
    protected void afterConnect() {
      mClient = JobMasterMasterServiceGrpc.newBlockingStub(mChannel);
    }
  
    /**
     * Returns a master id for a master address.
     *
     * @param address the address to get a master id for
     * @return a master id
     */
    public long getId(final Address address) throws IOException {
      return retryRPC(() -> mClient
          .getMasterId(GetJobMasterIdPRequest.newBuilder()
              .setMasterAddress(address.toProto()).build())
          .getMasterId(), LOG, "GetId", "address=%s", address);
    }
  
    /**
     * Sends a heartbeat to the leader master. Standby masters periodically execute this method
     * so that the leader master knows they are still running.
     *
     * @param masterId the master id
     * @return whether this master should re-register
     */
    public JobMasterMetaCommand heartbeat(final long masterId) throws IOException {
      return retryRPC(() -> mClient
          .masterHeartbeat(JobMasterHeartbeatPRequest.newBuilder().setMasterId(masterId)
              .setOptions(JobMasterHeartbeatPOptions.getDefaultInstance()).build())
          .getCommand(), LOG, "JobMasterHeartbeat", "masterId=%d", masterId);
    }
  
    /**
     * Registers with the leader master.
     *
     * @param masterId the master id of the standby master registering
     */
    public void register(final long masterId)
            throws IOException {
      final Map<String, Gauge> gauges = MetricsSystem.METRIC_REGISTRY.getGauges();
      RegisterJobMasterPOptions.Builder optionsBuilder = RegisterJobMasterPOptions.newBuilder()
          .setVersion(BuildVersion.newBuilder().setVersion(RuntimeConstants.VERSION)
              .setRevision(RuntimeConstants.REVISION_SHORT).build());
      Gauge startTimeGauge = gauges.get(MetricKey.MASTER_START_TIME.getName());
      if (startTimeGauge != null) {
        optionsBuilder.setStartTimeMs((long) startTimeGauge.getValue());
      }
      Gauge lastLosePrimacyGuage = gauges.get(MetricKey.MASTER_LAST_LOSE_PRIMACY_TIME.getName());
      if (lastLosePrimacyGuage != null) {
        optionsBuilder.setLosePrimacyTimeMs((long) lastLosePrimacyGuage.getValue());
      }
      retryRPC(() -> {
        mClient.registerMaster(RegisterJobMasterPRequest.newBuilder().setJobMasterId(masterId)
                .setOptions(optionsBuilder).build());
        return null;
      }, LOG, "Register", "jobMasterId=%d", masterId);
    }
  }
  