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.MetaMasterProxyServiceGrpc;
  import alluxio.grpc.ProxyHeartbeatPRequest;
  import alluxio.grpc.ProxyHeartbeatPResponse;
  
  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 MetaMasterProxyServiceHandler
          extends MetaMasterProxyServiceGrpc.MetaMasterProxyServiceImplBase {
    private static final Logger LOG = LoggerFactory.getLogger(MetaMasterProxyServiceHandler.class);
  
    private final MetaMaster mMetaMaster;
  
    /**
     * Creates a new instance of {@link MetaMasterProxyServiceHandler}.
     *
     * @param metaMaster the Alluxio meta master
     */
    public MetaMasterProxyServiceHandler(MetaMaster metaMaster) {
      mMetaMaster = metaMaster;
    }
  
    @Override
    public void proxyHeartbeat(ProxyHeartbeatPRequest request,
                               StreamObserver<ProxyHeartbeatPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> {
        mMetaMaster.proxyHeartbeat(request);
        return ProxyHeartbeatPResponse.newBuilder().build();
      }, "proxyHeartbeat", "request=%s", responseObserver, request);
    }
  }
  