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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include "opentelemetry/sdk/resource/resource.h"
#include "opentelemetry/sdk/trace/simple_processor.h"
#include "opentelemetry/sdk/trace/tracer_provider.h"
#include "opentelemetry/trace/provider.h"
#include "opentelemetry/trace/scope.h"
// Using an exporter that simply dumps span data to stdout.
#include "opentelemetry/exporters/ostream/span_exporter.h"
#include <algorithm>
#include <thread>
namespace trace_api = opentelemetry::trace;
namespace trace_sdk = opentelemetry::sdk::trace;
namespace nostd = opentelemetry::nostd;
namespace
{
void initTracer()
{
auto exporter = std::unique_ptr<trace_sdk::SpanExporter>(
new opentelemetry::exporter::trace::OStreamSpanExporter);
auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
auto provider = nostd::shared_ptr<trace_api::TracerProvider>(new trace_sdk::TracerProvider(
std::move(processor), opentelemetry::sdk::resource::Resource::Create({})));
// 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");
}
} // namespace
void run_threads()
{
auto thread_span = get_tracer()->StartSpan(__func__);
std::vector<std::thread> threads;
for (int thread_num = 0; thread_num < 5; ++thread_num)
{
// This shows how one can effectively use Scope objects to correctly
// parent spans across threads.
threads.push_back(std::thread([=] {
trace_api::Scope scope(thread_span);
auto thread_span =
get_tracer()->StartSpan(std::string("thread ") + std::to_string(thread_num));
}));
}
std::for_each(threads.begin(), threads.end(), [](std::thread &th) { th.join(); });
}
int main()
{
initTracer();
auto root_span = get_tracer()->StartSpan(__func__);
trace_api::Scope scope(root_span);
run_threads();
}
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