update ceph source to reef 18.1.2

[ceph.git] / ceph / src / jaegertracing / opentelemetry-cpp / examples / batch / main.cc

diff --git a/ceph/src/jaegertracing/opentelemetry-cpp/examples/batch/main.cc b/ceph/src/jaegertracing/opentelemetry-cpp/examples/batch/main.cc
new file mode 100644 (file)
index 0000000..9a4606e
--- /dev/null
+++ b/ceph/src/jaegertracing/opentelemetry-cpp/examples/batch/main.cc
@@ -0,0 +1,90 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#include "opentelemetry/sdk/trace/tracer_provider.h"
+#include "opentelemetry/trace/provider.h"
+// Using an exporter that simply dumps span data to stdout.
+#include "opentelemetry/exporters/ostream/span_exporter.h"
+#include "opentelemetry/sdk/trace/batch_span_processor.h"
+
+#include <chrono>
+#include <thread>
+
+constexpr int kNumSpans  = 10;
+namespace trace_api      = opentelemetry::trace;
+namespace resource       = opentelemetry::sdk::resource;
+namespace exporter_trace = opentelemetry::exporter::trace;
+namespace trace_sdk      = opentelemetry::sdk::trace;
+namespace nostd          = opentelemetry::nostd;
+
+namespace
+{
+
+void initTracer()
+{
+  auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(new exporter_trace::OStreamSpanExporter);
+
+  // CONFIGURE BATCH SPAN PROCESSOR PARAMETERS
+
+  trace_sdk::BatchSpanProcessorOptions options{};
+  // We make the queue size `KNumSpans`*2+5 because when the queue is half full, a preemptive notif
+  // is sent to start an export call, which we want to avoid in this simple example.
+  options.max_queue_size = kNumSpans * 2 + 5;
+  // Time interval (in ms) between two consecutive exports.
+  options.schedule_delay_millis = std::chrono::milliseconds(3000);
+  // We export `kNumSpans` after every `schedule_delay_millis` milliseconds.
+  options.max_export_batch_size = kNumSpans;
+
+  resource::ResourceAttributes attributes = {{"service", "test_service"}, {"version", (uint32_t)1}};
+  auto resource                           = resource::Resource::Create(attributes);
+
+  auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
+      new trace_sdk::BatchSpanProcessor(std::move(exporter), options));
+
+  auto provider = nostd::shared_ptr<trace_api::TracerProvider>(
+      new trace_sdk::TracerProvider(std::move(processor), resource));
+  // Set the global trace provider.
+  trace_api::Provider::SetTracerProvider(provider);
+}
+
+nostd::shared_ptr<trace_api::Tracer> get_tracer()
+{
+  auto provider = trace_api::Provider::GetTracerProvider();
+  return provider->GetTracer("foo_library");
+}
+
+void StartAndEndSpans()
+{
+  for (int i = 1; i <= kNumSpans; ++i)
+  {
+    get_tracer()->StartSpan("Span " + std::to_string(i));
+  }
+}
+
+}  // namespace
+
+int main()
+{
+  // Removing this line will leave the default noop TracerProvider in place.
+  initTracer();
+
+  std::cout << "Creating first batch of " << kNumSpans << " spans and waiting 3 seconds ...\n";
+  StartAndEndSpans();
+  std::this_thread::sleep_for(std::chrono::milliseconds(3000 + 50));
+  // The spans should now be exported.
+  std::cout << "....Exported!\n\n\n";
+
+  // Do the same again
+  std::cout << "Creating second batch of " << kNumSpans << " spans and waiting 3 seconds ...\n";
+  StartAndEndSpans();
+  std::this_thread::sleep_for(std::chrono::milliseconds(3000 + 50));
+  std::cout << "....Exported!\n\n\n";
+
+  // Shutdown and drain queue
+  StartAndEndSpans();
+  printf("Shutting down and draining queue.... \n");
+  std::this_thread::sleep_for(std::chrono::milliseconds(2000));
+  // We immediately let the program terminate which invokes the processor destructor
+  // which in turn invokes the processor Shutdown(), which finally drains the queue of ALL
+  // its spans.
+}