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.metrics;
  
  import alluxio.RpcUtils;
  import alluxio.grpc.ClearMetricsPRequest;
  import alluxio.grpc.ClearMetricsPResponse;
  import alluxio.grpc.GetMetricsPOptions;
  import alluxio.grpc.GetMetricsPResponse;
  import alluxio.grpc.MetricsHeartbeatPRequest;
  import alluxio.grpc.MetricsHeartbeatPResponse;
  import alluxio.grpc.MetricsMasterClientServiceGrpc;
  import alluxio.metrics.Metric;
  
  import com.google.common.base.Preconditions;
  import com.google.common.collect.Lists;
  import io.grpc.stub.StreamObserver;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.List;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * This class is a gRPC handler for metrics master RPCs invoked by an Alluxio client.
   */
  @NotThreadSafe
  public final class MetricsMasterClientServiceHandler
      extends MetricsMasterClientServiceGrpc.MetricsMasterClientServiceImplBase {
    private static final Logger LOG =
        LoggerFactory.getLogger(MetricsMasterClientServiceHandler.class);
  
    private final MetricsMaster mMetricsMaster;
  
    /**
     * @param metricsMaster {@link MetricsMaster} instance
     */
    public MetricsMasterClientServiceHandler(MetricsMaster metricsMaster) {
      Preconditions.checkNotNull(metricsMaster, "metricsMaster");
      mMetricsMaster = metricsMaster;
    }
  
    @Override
    public void clearMetrics(ClearMetricsPRequest request,
        StreamObserver<ClearMetricsPResponse> responseObserver) {
      RpcUtils.call(LOG, () -> {
        mMetricsMaster.clearMetrics();
        return ClearMetricsPResponse.newBuilder().build();
      }, "clearMetrics", "request=%s", responseObserver, request);
    }
  
    @Override
    public void metricsHeartbeat(MetricsHeartbeatPRequest request,
        StreamObserver<MetricsHeartbeatPResponse> responseObserver) {
      RpcUtils.call(LOG,
          (RpcUtils.RpcCallableThrowsIOException<MetricsHeartbeatPResponse>) () -> {
  
            for (alluxio.grpc.ClientMetrics clientMetric :
                request.getOptions().getClientMetricsList()) {
              List<Metric> metrics = Lists.newArrayList();
              for (alluxio.grpc.Metric metric : clientMetric.getMetricsList()) {
                metrics.add(Metric.fromProto(metric));
              }
              mMetricsMaster.clientHeartbeat(
                  clientMetric.getSource(), metrics);
            }
            return MetricsHeartbeatPResponse.getDefaultInstance();
          }, "metricsHeartbeat", "request=%s", responseObserver, request);
    }
  
    @Override
    public void getMetrics(GetMetricsPOptions options,
        StreamObserver<GetMetricsPResponse> responseObserver) {
      RpcUtils.call(LOG, (RpcUtils.RpcCallableThrowsIOException<GetMetricsPResponse>) () ->
          GetMetricsPResponse.newBuilder().putAllMetrics(mMetricsMaster.getMetrics()).build(),
          "getMetrics", "options=%s", responseObserver, options);
    }
  }
  