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87 lines
2.6 KiB
87 lines
2.6 KiB
// Copyright The OpenTelemetry Authors |
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// SPDX-License-Identifier: Apache-2.0 |
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#include <algorithm> |
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#include <string> |
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#include <thread> |
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#include <utility> |
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#include <vector> |
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#include "opentelemetry/exporters/ostream/span_exporter_factory.h" |
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#include "opentelemetry/nostd/shared_ptr.h" |
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#include "opentelemetry/sdk/resource/resource.h" |
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#include "opentelemetry/sdk/trace/exporter.h" |
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#include "opentelemetry/sdk/trace/processor.h" |
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#include "opentelemetry/sdk/trace/provider.h" |
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#include "opentelemetry/sdk/trace/simple_processor_factory.h" |
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#include "opentelemetry/sdk/trace/tracer_provider.h" |
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#include "opentelemetry/sdk/trace/tracer_provider_factory.h" |
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#include "opentelemetry/trace/provider.h" |
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#include "opentelemetry/trace/scope.h" |
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#include "opentelemetry/trace/span.h" |
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#include "opentelemetry/trace/tracer.h" |
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#include "opentelemetry/trace/tracer_provider.h" |
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namespace trace_api = opentelemetry::trace; |
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namespace trace_sdk = opentelemetry::sdk::trace; |
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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 = opentelemetry::exporter::trace::OStreamSpanExporterFactory::Create(); |
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auto processor = trace_sdk::SimpleSpanProcessorFactory::Create(std::move(exporter)); |
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std::shared_ptr<opentelemetry::trace::TracerProvider> provider = |
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trace_sdk::TracerProviderFactory::Create(std::move(processor), |
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opentelemetry::sdk::resource::Resource::Create({})); |
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// Set the global trace provider |
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trace_sdk::Provider::SetTracerProvider(provider); |
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} |
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void CleanupTracer() |
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{ |
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std::shared_ptr<opentelemetry::trace::TracerProvider> none; |
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trace_sdk::Provider::SetTracerProvider(none); |
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} |
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opentelemetry::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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} // namespace |
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void run_threads() |
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{ |
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auto thread_span = get_tracer()->StartSpan(__func__); |
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std::vector<std::thread> threads; |
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threads.reserve(5); |
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for (int thread_num = 0; thread_num < 5; ++thread_num) |
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{ |
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// This shows how one can effectively use Scope objects to correctly |
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// parent spans across threads. |
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threads.push_back(std::thread([=] { |
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trace_api::Scope scope(thread_span); |
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auto thread_span_2 = |
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get_tracer()->StartSpan(std::string("thread ") + std::to_string(thread_num)); |
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})); |
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} |
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std::for_each(threads.begin(), threads.end(), [](std::thread &th) { th.join(); }); |
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} |
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int main(int /* argc */, char ** /* argv */) |
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{ |
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InitTracer(); |
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{ |
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auto root_span = get_tracer()->StartSpan(__func__); |
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trace_api::Scope scope(root_span); |
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run_threads(); |
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} |
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CleanupTracer(); |
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return 0; |
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}
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