1 files changed, 118 insertions, 0 deletions
diff --git a/src/jaegertracing/opentelemetry-cpp/examples/prometheus/main.cc b/src/jaegertracing/opentelemetry-cpp/examples/prometheus/main.cc
new file mode 100644
index 000000000..77a648f55
--- /dev/null
+++ b/src/jaegertracing/opentelemetry-cpp/examples/prometheus/main.cc
@@ -0,0 +1,118 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef ENABLE_METRICS_PREVIEW
+#  include <memory>
+#  include <thread>
+#  include "opentelemetry/exporters/prometheus/exporter.h"
+#  include "opentelemetry/metrics/provider.h"
+#  include "opentelemetry/sdk/metrics/aggregation/default_aggregation.h"
+#  include "opentelemetry/sdk/metrics/aggregation/histogram_aggregation.h"
+#  include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader.h"
+#  include "opentelemetry/sdk/metrics/meter.h"
+#  include "opentelemetry/sdk/metrics/meter_provider.h"
+
+#  ifdef BAZEL_BUILD
+#    include "examples/common/metrics_foo_library/foo_library.h"
+#  else
+#    include "metrics_foo_library/foo_library.h"
+#  endif
+
+namespace metrics_sdk      = opentelemetry::sdk::metrics;
+namespace nostd            = opentelemetry::nostd;
+namespace common           = opentelemetry::common;
+namespace metrics_exporter = opentelemetry::exporter::metrics;
+namespace metrics_api      = opentelemetry::metrics;
+
+namespace
+{
+
+void initMetrics(const std::string &name, const std::string &addr)
+{
+  metrics_exporter::PrometheusExporterOptions opts;
+  if (!addr.empty())
+  {
+    opts.url = addr;
+  }
+  std::puts("PrometheusExporter example program running ...");
+
+  std::unique_ptr<metrics_sdk::MetricExporter> exporter{
+      new metrics_exporter::PrometheusExporter(opts)};
+
+  std::string version{"1.2.0"};
+  std::string schema{"https://opentelemetry.io/schemas/1.2.0"};
+
+  // Initialize and set the global MeterProvider
+  metrics_sdk::PeriodicExportingMetricReaderOptions options;
+  options.export_interval_millis = std::chrono::milliseconds(1000);
+  options.export_timeout_millis  = std::chrono::milliseconds(500);
+  std::unique_ptr<metrics_sdk::MetricReader> reader{
+      new metrics_sdk::PeriodicExportingMetricReader(std::move(exporter), options)};
+  auto provider = std::shared_ptr<metrics_api::MeterProvider>(new metrics_sdk::MeterProvider());
+  auto p        = std::static_pointer_cast<metrics_sdk::MeterProvider>(provider);
+  p->AddMetricReader(std::move(reader));
+
+  // counter view
+  std::string counter_name = name + "_counter";
+  std::unique_ptr<metrics_sdk::InstrumentSelector> instrument_selector{
+      new metrics_sdk::InstrumentSelector(metrics_sdk::InstrumentType::kCounter, counter_name)};
+  std::unique_ptr<metrics_sdk::MeterSelector> meter_selector{
+      new metrics_sdk::MeterSelector(name, version, schema)};
+  std::unique_ptr<metrics_sdk::View> sum_view{
+      new metrics_sdk::View{name, "description", metrics_sdk::AggregationType::kSum}};
+  p->AddView(std::move(instrument_selector), std::move(meter_selector), std::move(sum_view));
+
+  // histogram view
+  std::string histogram_name = name + "_histogram";
+  std::unique_ptr<metrics_sdk::InstrumentSelector> histogram_instrument_selector{
+      new metrics_sdk::InstrumentSelector(metrics_sdk::InstrumentType::kHistogram, histogram_name)};
+  std::unique_ptr<metrics_sdk::MeterSelector> histogram_meter_selector{
+      new metrics_sdk::MeterSelector(name, version, schema)};
+  std::unique_ptr<metrics_sdk::View> histogram_view{
+      new metrics_sdk::View{name, "description", metrics_sdk::AggregationType::kHistogram}};
+  p->AddView(std::move(histogram_instrument_selector), std::move(histogram_meter_selector),
+             std::move(histogram_view));
+  metrics_api::Provider::SetMeterProvider(provider);
+}
+}  // namespace
+
+int main(int argc, char **argv)
+{
+  std::string example_type;
+  std::string addr{"localhost:8080"};
+  if (argc == 1)
+  {
+    std::puts("usage: $prometheus_example <example type> <url>");
+  }
+
+  if (argc >= 2)
+  {
+    example_type = argv[1];
+  }
+  if (argc > 2)
+  {
+    addr = argv[2];
+  }
+
+  std::string name{"prometheus_metric_example"};
+  initMetrics(name, addr);
+
+  if (example_type == "counter")
+  {
+    foo_library::counter_example(name);
+  }
+  else if (example_type == "histogram")
+  {
+    foo_library::histogram_example(name);
+  }
+  else
+  {
+    std::thread counter_example{&foo_library::counter_example, name};
+    std::thread histogram_example{&foo_library::histogram_example, name};
+    counter_example.join();
+    histogram_example.join();
+  }
+}
+#else
+int main() {}
+#endif