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.proxy;
  
  import alluxio.AbstractMasterClient;
  import alluxio.Constants;
  import alluxio.RuntimeConstants;
  import alluxio.conf.PropertyKey;
  import alluxio.grpc.BuildVersion;
  import alluxio.grpc.MetaMasterProxyServiceGrpc;
  import alluxio.grpc.ProxyHeartbeatPOptions;
  import alluxio.grpc.ProxyHeartbeatPRequest;
  import alluxio.grpc.ServiceType;
  import alluxio.master.MasterClientContext;
  import alluxio.wire.Address;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.concurrent.TimeUnit;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * A wrapper for the gRPC client to interact with the meta master.
   */
  @ThreadSafe
  public class RetryHandlingMetaMasterProxyClient extends AbstractMasterClient {
    private static final Logger RPC_LOG =
        LoggerFactory.getLogger(RetryHandlingMetaMasterProxyClient.class);
    private MetaMasterProxyServiceGrpc.MetaMasterProxyServiceBlockingStub mClient = null;
    private final Address mProxyAddress;
    private final long mStartTimeMs;
  
    /**
     * Creates a new meta master client.
     *
     * @param proxyAddress address of the proxy
     * @param conf master client configuration
     * @param startTimeMs start timestamp
     */
    public RetryHandlingMetaMasterProxyClient(
        Address proxyAddress, MasterClientContext conf, long startTimeMs) {
      super(conf);
      mProxyAddress = proxyAddress;
      mStartTimeMs = startTimeMs;
    }
  
    @Override
    protected ServiceType getRemoteServiceType() {
      return ServiceType.META_MASTER_PROXY_SERVICE;
    }
  
    @Override
    protected String getServiceName() {
      return Constants.META_MASTER_PROXY_SERVICE_NAME;
    }
  
    @Override
    protected long getServiceVersion() {
      return Constants.META_MASTER_PROXY_SERVICE_VERSION;
    }
  
    @Override
    protected void afterConnect() {
      mClient = MetaMasterProxyServiceGrpc.newBlockingStub(mChannel);
    }
  
    /**
     * Sends a heartbeat to the primary master.
     */
    public void proxyHeartbeat() throws IOException {
      BuildVersion version = BuildVersion.newBuilder().setVersion(RuntimeConstants.VERSION)
          .setRevision(RuntimeConstants.REVISION_SHORT).build();
      ProxyHeartbeatPOptions options = ProxyHeartbeatPOptions.newBuilder()
          .setProxyAddress(mProxyAddress.toProto())
          .setStartTime(mStartTimeMs)
          .setVersion(version).build();
      retryRPC(() -> mClient.withDeadlineAfter(
          mContext.getClusterConf().getMs(
              PropertyKey.USER_RPC_RETRY_MAX_DURATION), TimeUnit.MILLISECONDS)
          .proxyHeartbeat(ProxyHeartbeatPRequest.newBuilder().setOptions(options).build()),
          RPC_LOG, "ProxyHeartbeat", "options=%s", options);
    }
  }
  
  