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// This file is part of CAF, the C++ Actor Framework. See the file LICENSE in
// the main distribution directory for license terms and copyright or visit
// https://github.com/actor-framework/actor-framework/blob/master/LICENSE.
#pragma once
#include <chrono>
#include "caf/telemetry/histogram.hpp"
namespace caf::telemetry {
/// Convenience helper for measuring durations such as latency using a histogram
/// with second resolution. The measurement starts when creating the objects and
/// finishes when the timer goes out of scope.
class timer {
public:
using clock_type = std::chrono::steady_clock;
explicit timer(dbl_histogram* h) : h_(h) {
if (h)
start_ = clock_type::now();
}
~timer() {
if (h_)
observe(h_, start_);
}
auto histogram_ptr() const noexcept {
return h_;
}
auto started() const noexcept {
return start_;
}
static void observe(dbl_histogram* h, clock_type::time_point start) {
using dbl_sec = std::chrono::duration<double>;
auto end = clock_type::now();
h->observe(std::chrono::duration_cast<dbl_sec>(end - start).count());
}
private:
dbl_histogram* h_;
clock_type::time_point start_;
};
} // namespace caf::telemetry
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