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#include <c10/util/Gauge.h>
#include <c10/util/Synchronized.h>
#include <memory>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
namespace c10::monitor {
namespace detail {
namespace {
using GaugeBackendFactories =
std::vector<std::shared_ptr<GaugeBackendFactoryIf>>;
Synchronized<GaugeBackendFactories>& gaugeBackendFactories() {
static auto instance = new Synchronized<GaugeBackendFactories>();
return *instance;
}
} // namespace
class GaugeImpl {
public:
static GaugeImpl& getInstance(std::string_view key) {
static auto& implMapSynchronized = *new Synchronized<
std::unordered_map<std::string, std::unique_ptr<GaugeImpl>>>();
return *implMapSynchronized.withLock([&](auto& implMap) {
if (auto implIt = implMap.find(std::string(key));
implIt != implMap.end()) {
return implIt->second.get();
}
auto [implIt, emplaceSuccess] = implMap.emplace(
std::string{key}, std::unique_ptr<GaugeImpl>(new GaugeImpl(key)));
assert(emplaceSuccess);
return implIt->second.get();
});
}
void record(int64_t value) {
for (auto& backend : backends_) {
backend->record(value);
}
}
private:
explicit GaugeImpl(std::string_view key) {
auto factoriesCopy = gaugeBackendFactories().withLock(
[](auto& factories) { return factories; });
for (const auto& factory : factoriesCopy) {
if (auto backend = factory->create(key)) {
backends_.push_back(std::move(backend));
}
}
}
SmallVector<std::unique_ptr<GaugeBackendIf>> backends_;
};
void registerGaugeBackend(std::unique_ptr<GaugeBackendFactoryIf> backend) {
gaugeBackendFactories().withLock(
[&](auto& backends) { backends.push_back(std::move(backend)); });
}
} // namespace detail
GaugeHandle::GaugeHandle(std::string_view key)
: impl_(detail::GaugeImpl::getInstance(key)) {}
void GaugeHandle::record(int64_t value) {
impl_.record(value);
}
} // namespace c10::monitor
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