includes/opentelemetry/sdk/metrics/state/observable_registry.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include <memory>
#include <mutex>
#include <vector>
 
#include "opentelemetry/common/timestamp.h"
#include "opentelemetry/metrics/async_instruments.h"
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
 
struct ObservableCallbackRecord
{
  opentelemetry::metrics::ObservableCallbackPtr callback;
  void *state;
  opentelemetry::metrics::ObservableInstrument *instrument;
};
 
class ObservableRegistry
{
public:
  void AddCallback(opentelemetry::metrics::ObservableCallbackPtr callback,
                   void *state,
                   opentelemetry::metrics::ObservableInstrument *instrument);
 
  void RemoveCallback(opentelemetry::metrics::ObservableCallbackPtr callback,
                      void *state,
                      opentelemetry::metrics::ObservableInstrument *instrument);
 
  void CleanupCallback(opentelemetry::metrics::ObservableInstrument *instrument);
 
  void Observe(opentelemetry::common::SystemTimestamp collection_ts);
 
private:
  std::vector<std::unique_ptr<ObservableCallbackRecord>> callbacks_;
  std::mutex callbacks_m_;
};
 
}  // namespace metrics
}  // namespace sdk
OPENTELEMETRY_END_NAMESPACE