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#ifndef QUERY_H
#define QUERY_H
#include "ml-private.h"
namespace ml {
class Query {
public:
Query(RRDDIM *RD) : RD(RD), Initialized(false) {
Ops = RD->tiers[0].query_ops;
}
time_t latestTime() {
return Ops->latest_time_s(RD->tiers[0].db_metric_handle);
}
time_t oldestTime() {
return Ops->oldest_time_s(RD->tiers[0].db_metric_handle);
}
void init(time_t AfterT, time_t BeforeT) {
Ops->init(RD->tiers[0].db_metric_handle, &Handle, AfterT, BeforeT, STORAGE_PRIORITY_BEST_EFFORT);
Initialized = true;
points_read = 0;
}
bool isFinished() {
return Ops->is_finished(&Handle);
}
~Query() {
if (Initialized) {
Ops->finalize(&Handle);
global_statistics_ml_query_completed(points_read);
points_read = 0;
}
}
std::pair<time_t, CalculatedNumber> nextMetric() {
points_read++;
STORAGE_POINT sp = Ops->next_metric(&Handle);
return {sp.end_time_s, sp.sum / sp.count };
}
private:
RRDDIM *RD;
bool Initialized;
size_t points_read;
struct storage_engine_query_ops *Ops;
struct storage_engine_query_handle Handle;
};
} // namespace ml
#endif /* QUERY_H */
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