a143ef9b38
Summary: Change namespace from leveldb to rocksdb. This allows a single application to link in open-source leveldb code as well as rocksdb code into the same process. Test Plan: compile rocksdb Reviewers: emayanke Reviewed By: emayanke CC: leveldb Differential Revision: https://reviews.facebook.net/D13287
69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
#ifndef STORAGE_LEVELDB_UTIL_STOP_WATCH_H_
|
|
#define STORAGE_LEVELDB_UTIL_STOP_WATCH_H_
|
|
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/statistics.h"
|
|
|
|
namespace rocksdb {
|
|
// Auto-scoped.
|
|
// Records the statistic into the corresponding histogram.
|
|
class StopWatch {
|
|
public:
|
|
StopWatch(
|
|
Env * const env,
|
|
std::shared_ptr<Statistics> statistics = nullptr,
|
|
const Histograms histogram_name = DB_GET) :
|
|
env_(env),
|
|
start_time_(env->NowMicros()),
|
|
statistics_(statistics),
|
|
histogram_name_(histogram_name) {}
|
|
|
|
|
|
|
|
uint64_t ElapsedMicros() {
|
|
return env_->NowMicros() - start_time_;
|
|
}
|
|
|
|
~StopWatch() {
|
|
if (statistics_) {
|
|
statistics_->measureTime(histogram_name_, ElapsedMicros());
|
|
}
|
|
}
|
|
|
|
private:
|
|
Env* const env_;
|
|
const uint64_t start_time_;
|
|
std::shared_ptr<Statistics> statistics_;
|
|
const Histograms histogram_name_;
|
|
|
|
};
|
|
|
|
// a nano second precision stopwatch
|
|
class StopWatchNano {
|
|
public:
|
|
StopWatchNano(Env* const env, bool auto_start = false)
|
|
: env_(env), start_(0) {
|
|
if (auto_start) {
|
|
Start();
|
|
}
|
|
}
|
|
|
|
void Start() { start_ = env_->NowNanos(); }
|
|
|
|
uint64_t ElapsedNanos(bool reset = false) {
|
|
auto now = env_->NowNanos();
|
|
auto elapsed = now - start_;
|
|
if (reset) {
|
|
start_ = now;
|
|
}
|
|
return elapsed;
|
|
}
|
|
|
|
private:
|
|
Env* const env_;
|
|
uint64_t start_;
|
|
};
|
|
|
|
} // namespace rocksdb
|
|
#endif // STORAGE_LEVELDB_UTIL_STOP_WATCH_H_
|