text: /*
   *
   * Copyright 2019 gRPC authors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  #ifndef GRPCPP_OPENCENSUS_H
  #define GRPCPP_OPENCENSUS_H
  
  #include "opencensus/trace/span.h"
  
  namespace grpc_impl {
  class ServerContext;
  }  // namespace grpc_impl
  
  namespace grpc {
  // These symbols in this file will not be included in the binary unless
  // grpc_opencensus_plugin build target was added as a dependency. At the moment
  // it is only setup to be built with Bazel.
  
  // Registers the OpenCensus plugin with gRPC, so that it will be used for future
  // RPCs. This must be called before any views are created.
  void RegisterOpenCensusPlugin();
  
  // RPC stats definitions, defined by
  // https://github.com/census-instrumentation/opencensus-specs/blob/master/stats/gRPC.md
  
  // Registers the cumulative gRPC views so that they will be exported by any
  // registered stats exporter. For on-task stats, construct a View using the
  // ViewDescriptors below.
  void RegisterOpenCensusViewsForExport();
  
  // Returns the tracing Span for the current RPC.
  ::opencensus::trace::Span GetSpanFromServerContext(
      ::grpc_impl::ServerContext* context);
  
  }  // namespace grpc
  
  #endif  // GRPCPP_OPENCENSUS_H
  