89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
// 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/nostd/string_view.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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