ceph/src/jaegertracing/opentelemetry-cpp/api/include/opentelemetry/_metrics/observer_result.h

   1 // Copyright The OpenTelemetry Authors
   2 // SPDX-License-Identifier: Apache-2.0
   3
   4 #pragma once
   5 #ifdef ENABLE_METRICS_PREVIEW
   6
   7 #  include "opentelemetry/_metrics/instrument.h"
   8 #  include "opentelemetry/nostd/shared_ptr.h"
   9
  10 OPENTELEMETRY_BEGIN_NAMESPACE
  11 namespace metrics
  12 {
  13
  14 /**
  15  * ObserverResult class is necessary for the callback recording asynchronous
  16  * instrument use.  Callback functions asynchronous instruments are designed to
  17  * accept a single ObserverResult object and update using its pointer to the
  18  * instrument itself.
  19  */
  20
  21 template <class T>
  22 class ObserverResult
  23 {
  24
  25 public:
  26   ObserverResult() = default;
  27
  28   ObserverResult(AsynchronousInstrument<T> *instrument) : instrument_(instrument) {}
  29
  30   virtual void observe(T value, const common::KeyValueIterable &labels)
  31   {
  32     instrument_->observe(value, labels);
  33   }
  34
  35 private:
  36   AsynchronousInstrument<T> *instrument_;
  37 };
  38
  39 }  // namespace metrics
  40 OPENTELEMETRY_END_NAMESPACE
  41 #endif