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https://github.com/facebook/rocksdb.git
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80 lines
2 KiB
C++
80 lines
2 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#pragma once
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#include "rocksdb/env.h"
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#include "util/statistics.h"
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namespace rocksdb {
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// Auto-scoped.
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// Records the measure time into the corresponding histogram if statistics
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// is not nullptr. It is also saved into *elapsed if the pointer is not nullptr.
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class StopWatch {
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public:
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StopWatch(Env * const env, Statistics* statistics,
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const uint32_t hist_type,
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uint64_t* elapsed = nullptr)
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: env_(env),
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statistics_(statistics),
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hist_type_(hist_type),
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elapsed_(elapsed),
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stats_enabled_(statistics && statistics->HistEnabledForType(hist_type)),
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start_time_((stats_enabled_ || elapsed != nullptr) ?
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env->NowMicros() : 0) {
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}
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~StopWatch() {
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if (elapsed_) {
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*elapsed_ = env_->NowMicros() - start_time_;
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}
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if (stats_enabled_) {
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statistics_->measureTime(hist_type_,
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(elapsed_ != nullptr) ? *elapsed_ :
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(env_->NowMicros() - start_time_));
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}
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}
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private:
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Env* const env_;
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Statistics* statistics_;
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const uint32_t hist_type_;
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uint64_t* elapsed_;
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bool stats_enabled_;
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const uint64_t start_time_;
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};
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// a nano second precision stopwatch
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class StopWatchNano {
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public:
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explicit StopWatchNano(Env* const env, bool auto_start = false)
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: env_(env), start_(0) {
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if (auto_start) {
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Start();
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}
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}
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void Start() { start_ = env_->NowNanos(); }
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uint64_t ElapsedNanos(bool reset = false) {
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auto now = env_->NowNanos();
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auto elapsed = now - start_;
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if (reset) {
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start_ = now;
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}
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return elapsed;
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}
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uint64_t ElapsedNanosSafe(bool reset = false) {
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return (env_ != nullptr) ? ElapsedNanos(reset) : 0U;
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}
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private:
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Env* const env_;
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uint64_t start_;
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};
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} // namespace rocksdb
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