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.client.metrics;
  
  import alluxio.AbstractMasterClient;
  import alluxio.Constants;
  import alluxio.exception.status.AlluxioStatusException;
  import alluxio.exception.status.UnavailableException;
  import alluxio.grpc.ClearMetricsPRequest;
  import alluxio.grpc.ClientMetrics;
  import alluxio.grpc.GetMetricsPOptions;
  import alluxio.grpc.MetricValue;
  import alluxio.grpc.MetricsHeartbeatPOptions;
  import alluxio.grpc.MetricsHeartbeatPRequest;
  import alluxio.grpc.MetricsMasterClientServiceGrpc;
  import alluxio.grpc.ServiceType;
  import alluxio.master.MasterClientContext;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.Map;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * A wrapper for the gRPC client to interact with the metrics master.
   */
  @ThreadSafe
  public class RetryHandlingMetricsMasterClient extends AbstractMasterClient
      implements MetricsMasterClient {
    private static final Logger LOG =
        LoggerFactory.getLogger(RetryHandlingMetricsMasterClient.class);
    private MetricsMasterClientServiceGrpc.MetricsMasterClientServiceBlockingStub mClient = null;
  
    /**
     * Creates a new metrics master client.
     *
     * @param conf master client configuration
     */
    public RetryHandlingMetricsMasterClient(MasterClientContext conf) {
      super(conf);
    }
  
    @Override
    protected ServiceType getRemoteServiceType() {
      return ServiceType.METRICS_MASTER_CLIENT_SERVICE;
    }
  
    @Override
    protected String getServiceName() {
      return Constants.METRICS_MASTER_CLIENT_SERVICE_NAME;
    }
  
    @Override
    protected long getServiceVersion() {
      return Constants.METRICS_MASTER_CLIENT_SERVICE_VERSION;
    }
  
    @Override
    protected void afterConnect() {
      mClient = MetricsMasterClientServiceGrpc.newBlockingStub(mChannel);
    }
  
    @Override
    public void clearMetrics() throws IOException {
      retryRPC(() -> mClient.clearMetrics(ClearMetricsPRequest.newBuilder().build()),
          LOG, "ClearMetrics", "");
    }
  
    @Override
    public void heartbeat(final List<ClientMetrics> metrics) throws IOException {
      connect();
      try {
        MetricsHeartbeatPRequest.Builder request = MetricsHeartbeatPRequest.newBuilder();
        request.setOptions(MetricsHeartbeatPOptions.newBuilder()
            .addAllClientMetrics(metrics).build());
        mClient.metricsHeartbeat(request.build());
      } catch (io.grpc.StatusRuntimeException e) {
        disconnect();
        throw new UnavailableException(e);
      }
    }
  
    @Override
    public Map<String, MetricValue> getMetrics() throws AlluxioStatusException {
      return retryRPC(
          () -> mClient.getMetrics(GetMetricsPOptions.getDefaultInstance()).getMetricsMap(),
          LOG, "GetMetrics", "");
    }
  }
  