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