Program Listing for File meter_provider.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/metrics/meter.h"
#include "opentelemetry/metrics/meter_provider.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/sdk/metrics/meter.h"
#include "opentelemetry/sdk/metrics/meter_context.h"
#include "opentelemetry/sdk/resource/resource.h"
#include "opentelemetry/version.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{

// forward declaration
class MetricCollector;
class MetricReader;

class MeterProvider final : public opentelemetry::metrics::MeterProvider
{
public:
  MeterProvider(
      std::unique_ptr<ViewRegistry> views = std::unique_ptr<ViewRegistry>(new ViewRegistry()),
      sdk::resource::Resource resource    = sdk::resource::Resource::Create({})) noexcept;

  explicit MeterProvider(std::shared_ptr<sdk::metrics::MeterContext> context) noexcept;

  nostd::shared_ptr<opentelemetry::metrics::Meter> GetMeter(
      nostd::string_view name,
      nostd::string_view version    = "",
      nostd::string_view schema_url = "") noexcept override;

  const sdk::resource::Resource &GetResource() const noexcept;

  void AddMetricReader(std::shared_ptr<MetricReader> reader) noexcept;

  void AddView(std::unique_ptr<InstrumentSelector> instrument_selector,
               std::unique_ptr<MeterSelector> meter_selector,
               std::unique_ptr<View> view) noexcept;

  bool Shutdown() noexcept;

  bool ForceFlush(std::chrono::microseconds timeout = (std::chrono::microseconds::max)()) noexcept;

  ~MeterProvider() override;

private:
  std::shared_ptr<sdk::metrics::MeterContext> context_;
  std::mutex lock_;
};
}  // namespace metrics
}  // namespace sdk
OPENTELEMETRY_END_NAMESPACE