Make SystemClock into a Customizable Class (#8636)
Summary: Made SystemClock into a Customizable class, complete with CreateFromString. Cleaned up some of the existing SystemClock implementations that were redundant (NoSleep was the same as the internal one for MockEnv). Changed MockEnv construction to allow Clock to be passed to the Memory/MockFileSystem. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8636 Reviewed By: zhichao-cao Differential Revision: D30483360 Pulled By: mrambacher fbshipit-source-id: cd0e3a876c39f8c98fe13374c06e8edbd5b9f2a1main
mrambacher
3 years ago
committed by
Facebook GitHub Bot
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// 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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virtual 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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virtual 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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virtual 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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virtual 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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virtual 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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virtual 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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