6924869867
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: cd0e3a876c39f8c98fe13374c06e8edbd5b9f2a1
78 lines
2.7 KiB
C++
78 lines
2.7 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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#pragma once
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#include <atomic>
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#include <limits>
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#include "rocksdb/system_clock.h"
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namespace ROCKSDB_NAMESPACE {
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// NOTE: SpecialEnv offers most of this functionality, along with hooks
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// for safe DB behavior under a mock time environment, so should be used
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// instead of MockSystemClock for DB tests.
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class MockSystemClock : public SystemClockWrapper {
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public:
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explicit MockSystemClock(const std::shared_ptr<SystemClock>& base)
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: SystemClockWrapper(base) {}
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static const char* kClassName() { return "MockSystemClock"; }
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const char* Name() const override { return kClassName(); }
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virtual Status GetCurrentTime(int64_t* time_sec) override {
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assert(time_sec != nullptr);
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*time_sec = static_cast<int64_t>(current_time_us_ / kMicrosInSecond);
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return Status::OK();
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}
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virtual uint64_t NowSeconds() { return current_time_us_ / kMicrosInSecond; }
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virtual uint64_t NowMicros() override { return current_time_us_; }
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virtual uint64_t NowNanos() override {
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assert(current_time_us_ <= std::numeric_limits<uint64_t>::max() / 1000);
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return current_time_us_ * 1000;
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}
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uint64_t RealNowMicros() { return target_->NowMicros(); }
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void SetCurrentTime(uint64_t time_sec) {
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assert(time_sec < std::numeric_limits<uint64_t>::max() / kMicrosInSecond);
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assert(time_sec * kMicrosInSecond >= current_time_us_);
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current_time_us_ = time_sec * kMicrosInSecond;
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}
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// It's a fake sleep that just updates the Env current time, which is similar
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// to `NoSleepEnv.SleepForMicroseconds()` and
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// `SpecialEnv.MockSleepForMicroseconds()`.
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// It's also similar to `set_current_time()`, which takes an absolute time in
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// seconds, vs. this one takes the sleep in microseconds.
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// Note: Not thread safe.
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void SleepForMicroseconds(int micros) override {
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assert(micros >= 0);
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assert(current_time_us_ + static_cast<uint64_t>(micros) >=
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current_time_us_);
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current_time_us_.fetch_add(micros);
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}
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void MockSleepForSeconds(int seconds) {
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assert(seconds >= 0);
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int micros = seconds * kMicrosInSecond;
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SleepForMicroseconds(micros);
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}
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// TODO: this is a workaround for the different behavior on different platform
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// for timedwait timeout. Ideally timedwait API should be moved to env.
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// details: PR #7101.
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void InstallTimedWaitFixCallback();
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private:
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std::atomic<uint64_t> current_time_us_{0};
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static constexpr uint64_t kMicrosInSecond = 1000U * 1000U;
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};
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} // namespace ROCKSDB_NAMESPACE
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