mirror of https://github.com/facebook/rocksdb.git
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include <atomic>
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#include <string>
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#include "rocksdb/status.h"
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#include "rocksdb/system_clock.h"
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namespace ROCKSDB_NAMESPACE {
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// A SystemClock that can "mock" sleep and counts its operations.
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class EmulatedSystemClock : public SystemClockWrapper {
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private:
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// Something to return when mocking current time
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const int64_t maybe_starting_time_;
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std::atomic<int> sleep_counter_{0};
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std::atomic<int> cpu_counter_{0};
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std::atomic<int64_t> addon_microseconds_{0};
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// Do not modify in the env of a running DB (could cause deadlock)
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std::atomic<bool> time_elapse_only_sleep_;
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bool no_slowdown_;
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public:
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explicit EmulatedSystemClock(const std::shared_ptr<SystemClock>& base,
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bool time_elapse_only_sleep = false);
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static const char* kClassName() { return "TimeEmulatedSystemClock"; }
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const char* Name() const override { return kClassName(); }
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void SleepForMicroseconds(int micros) override {
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sleep_counter_++;
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if (no_slowdown_ || time_elapse_only_sleep_) {
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addon_microseconds_.fetch_add(micros);
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}
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if (!no_slowdown_) {
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SystemClockWrapper::SleepForMicroseconds(micros);
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}
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}
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void MockSleepForMicroseconds(int64_t micros) {
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sleep_counter_++;
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assert(no_slowdown_);
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addon_microseconds_.fetch_add(micros);
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}
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void MockSleepForSeconds(int64_t seconds) {
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sleep_counter_++;
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assert(no_slowdown_);
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addon_microseconds_.fetch_add(seconds * 1000000);
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}
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void SetTimeElapseOnlySleep(bool enabled) {
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// We cannot set these before destroying the last DB because they might
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// cause a deadlock or similar without the appropriate options set in
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// the DB.
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time_elapse_only_sleep_ = enabled;
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no_slowdown_ = enabled;
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}
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bool IsTimeElapseOnlySleep() const { return time_elapse_only_sleep_.load(); }
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void SetMockSleep(bool enabled = true) { no_slowdown_ = enabled; }
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bool IsMockSleepEnabled() const { return no_slowdown_; }
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int GetSleepCounter() const { return sleep_counter_.load(); }
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Status GetCurrentTime(int64_t* unix_time) override {
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Status s;
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if (time_elapse_only_sleep_) {
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*unix_time = maybe_starting_time_;
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} else {
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s = SystemClockWrapper::GetCurrentTime(unix_time);
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}
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if (s.ok()) {
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// mock microseconds elapsed to seconds of time
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*unix_time += addon_microseconds_.load() / 1000000;
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}
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return s;
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}
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uint64_t CPUNanos() override {
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cpu_counter_++;
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return SystemClockWrapper::CPUNanos();
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}
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uint64_t CPUMicros() override {
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cpu_counter_++;
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return SystemClockWrapper::CPUMicros();
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}
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uint64_t NowNanos() override {
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return (time_elapse_only_sleep_ ? 0 : SystemClockWrapper::NowNanos()) +
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addon_microseconds_.load() * 1000;
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}
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uint64_t NowMicros() override {
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return (time_elapse_only_sleep_ ? 0 : SystemClockWrapper::NowMicros()) +
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addon_microseconds_.load();
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}
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int GetCpuCounter() const { return cpu_counter_.load(); }
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void ResetCounters() {
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cpu_counter_.store(0);
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sleep_counter_.store(0);
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}
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};
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} // namespace ROCKSDB_NAMESPACE
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