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.RpcUtils;
  import alluxio.grpc.GetJobMasterIdPRequest;
  import alluxio.grpc.GetJobMasterIdPResponse;
  import alluxio.grpc.JobMasterHeartbeatPRequest;
  import alluxio.grpc.JobMasterHeartbeatPResponse;
  import alluxio.grpc.JobMasterMasterServiceGrpc;
  import alluxio.grpc.NetAddress;
  import alluxio.grpc.RegisterJobMasterPRequest;
  import alluxio.grpc.RegisterJobMasterPResponse;
  import alluxio.master.job.JobMaster;
  import alluxio.wire.Address;
  
  import io.grpc.stub.StreamObserver;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * This class is a gRPC handler for the primary job master to answer RPC from standby job masters.
   */
  @NotThreadSafe
  public final class JobMasterMasterServiceHandler
          extends JobMasterMasterServiceGrpc.JobMasterMasterServiceImplBase {
    private static final Logger LOG = LoggerFactory.getLogger(JobMasterMasterServiceHandler.class);
  
    private final JobMaster mJobMaster;
  
    /**
     * Creates a new instance of {@link JobMasterMasterServiceHandler}.
     *
     * @param jobMaster the job master from the primary job master process
     */
    public JobMasterMasterServiceHandler(JobMaster jobMaster) {
      LOG.info("Started to serve standby job master requests");
      mJobMaster = jobMaster;
    }
  
    @Override
    public void getMasterId(GetJobMasterIdPRequest request,
                            StreamObserver<GetJobMasterIdPResponse> responseObserver) {
      NetAddress masterAddress = request.getMasterAddress();
      RpcUtils.call(LOG, () -> GetJobMasterIdPResponse.newBuilder()
                      .setMasterId(mJobMaster.getMasterId(Address.fromProto(masterAddress))).build(),
              "GetJobMasterId", "request=%s", responseObserver, request);
    }
  
    @Override
    public void registerMaster(RegisterJobMasterPRequest request,
                               StreamObserver<RegisterJobMasterPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> {
        mJobMaster.jobMasterRegister(request.getJobMasterId(), request.getOptions());
        return RegisterJobMasterPResponse.getDefaultInstance();
      }, "RegisterJobMaster", "request=%s", responseObserver, request);
    }
  
    @Override
    public void masterHeartbeat(JobMasterHeartbeatPRequest request,
                                StreamObserver<JobMasterHeartbeatPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> JobMasterHeartbeatPResponse.newBuilder().setCommand(
          mJobMaster.jobMasterHeartbeat(request.getMasterId(), request.getOptions())).build(),
          "JobMasterHeartbeat", "request=%s", responseObserver, request);
    }
  }
  