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#ifndef CERT_TRANS_UTIL_PERIODIC_CLOSURE_H_
#define CERT_TRANS_UTIL_PERIODIC_CLOSURE_H_
#include <chrono>
#include <functional>
#include <memory>
#include "base/macros.h"
#include "util/libevent_wrapper.h"
namespace cert_trans {
// Arranges for "closure" to be called every "period". If "closure"
// runs for too long, it will skip to the next period that is in the
// future.
//
// This object should always be destroyed either from a libevent
// callback, or while the libevent dispatcher is not running. It
// should also NOT be destroyed from within "closure".
class PeriodicClosure {
public:
PeriodicClosure(const std::shared_ptr<libevent::Base>& base,
const std::chrono::duration<double>& period,
const std::function<void()>& closure);
private:
typedef std::chrono::steady_clock clock;
void Run();
const std::shared_ptr<libevent::Base> base_;
const clock::duration period_;
const std::function<void()> closure_;
libevent::Event event_;
clock::time_point target_run_time_;
DISALLOW_COPY_AND_ASSIGN(PeriodicClosure);
};
} // namespace cert_trans
#endif // CERT_TRANS_UTIL_PERIODIC_CLOSURE_H_
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