1 files changed, 72 insertions, 0 deletions
diff --git a/src/jaegertracing/opentelemetry-cpp/sdk/include/opentelemetry/sdk/metrics/metric_reader.h b/src/jaegertracing/opentelemetry-cpp/sdk/include/opentelemetry/sdk/metrics/metric_reader.h
new file mode 100644
index 000000000..94924315f
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/sdk/include/opentelemetry/sdk/metrics/metric_reader.h
@@ -0,0 +1,72 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+#ifndef ENABLE_METRICS_PREVIEW
+#  include "opentelemetry/common/spin_lock_mutex.h"
+#  include "opentelemetry/sdk/common/global_log_handler.h"
+#  include "opentelemetry/sdk/metrics/data/metric_data.h"
+#  include "opentelemetry/sdk/metrics/export/metric_producer.h"
+#  include "opentelemetry/sdk/metrics/instruments.h"
+#  include "opentelemetry/version.h"
+
+#  include <chrono>
+#  include <memory>
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace sdk
+{
+namespace metrics
+{
+
+/**
+ * MetricReader defines the interface to collect metrics from SDK
+ */
+class MetricReader
+{
+public:
+  MetricReader(
+      AggregationTemporality aggregation_temporality = AggregationTemporality::kCumulative);
+
+  void SetMetricProducer(MetricProducer *metric_producer);
+
+  /**
+   * Collect the metrics from SDK.
+   * @return return the status of the operation.
+   */
+  bool Collect(nostd::function_ref<bool(ResourceMetrics &metric_data)> callback) noexcept;
+
+  AggregationTemporality GetAggregationTemporality() const noexcept;
+
+  /**
+   * Shutdown the meter reader.
+   */
+  bool Shutdown(std::chrono::microseconds timeout = std::chrono::microseconds::max()) noexcept;
+
+  /**
+   * Force flush the metric read by the reader.
+   */
+  bool ForceFlush(std::chrono::microseconds timeout = std::chrono::microseconds::max()) noexcept;
+
+  virtual ~MetricReader() = default;
+
+private:
+  virtual bool OnForceFlush(std::chrono::microseconds timeout) noexcept = 0;
+
+  virtual bool OnShutDown(std::chrono::microseconds timeout) noexcept = 0;
+
+  virtual void OnInitialized() noexcept {}
+
+protected:
+  bool IsShutdown() const noexcept;
+
+private:
+  MetricProducer *metric_producer_;
+  AggregationTemporality aggregation_temporality_;
+  mutable opentelemetry::common::SpinLockMutex lock_;
+  bool shutdown_;
+};
+}  // namespace metrics
+}  // namespace sdk
+OPENTELEMETRY_END_NAMESPACE
+#endif