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.GetMasterIdPRequest;
  import alluxio.grpc.GetMasterIdPResponse;
  import alluxio.grpc.MasterHeartbeatPRequest;
  import alluxio.grpc.MasterHeartbeatPResponse;
  import alluxio.grpc.MetaMasterMasterServiceGrpc;
  import alluxio.grpc.NetAddress;
  import alluxio.grpc.RegisterMasterPRequest;
  import alluxio.grpc.RegisterMasterPResponse;
  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 meta master RPCs invoked by an Alluxio standby master.
   */
  @NotThreadSafe
  public final class MetaMasterMasterServiceHandler
      extends MetaMasterMasterServiceGrpc.MetaMasterMasterServiceImplBase {
    private static final Logger LOG = LoggerFactory.getLogger(MetaMasterMasterServiceHandler.class);
  
    private final MetaMaster mMetaMaster;
  
    /**
     * Creates a new instance of {@link MetaMasterMasterServiceHandler}.
     *
     * @param metaMaster the Alluxio meta master
     */
    public MetaMasterMasterServiceHandler(MetaMaster metaMaster) {
      mMetaMaster = metaMaster;
    }
  
    @Override
    public void getMasterId(GetMasterIdPRequest request,
        StreamObserver<GetMasterIdPResponse> responseObserver) {
      NetAddress masterAddress = request.getMasterAddress();
      RpcUtils.call(LOG, () -> GetMasterIdPResponse.newBuilder()
          .setMasterId(mMetaMaster.getMasterId(Address.fromProto(masterAddress))).build(),
          "getMasterId", "request=%s", responseObserver, request);
    }
  
    @Override
    public void registerMaster(RegisterMasterPRequest request,
        StreamObserver<RegisterMasterPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> {
        mMetaMaster.masterRegister(request.getMasterId(), request.getOptions());
        return RegisterMasterPResponse.getDefaultInstance();
      }, "registerMaster", "request=%s", responseObserver, request);
    }
  
    @Override
    public void masterHeartbeat(MasterHeartbeatPRequest request,
        StreamObserver<MasterHeartbeatPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> MasterHeartbeatPResponse.newBuilder().setCommand(
          mMetaMaster.masterHeartbeat(request.getMasterId(), request.getOptions())).build(),
          "masterHeartbeat", "request=%s", responseObserver, request);
    }
  }
  