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1fdbcb591f
decoupling code that uses time from the code that creates a point in time. You can use this to your advantage by injecting Clocks into interfaces rather than having implementations call absl::Now() directly. absl::Clock::GetRealClock() returns an absl::Clock backed by absl::Now(). Add absl::SimulatedClock, a test-only Clock implementation that does not "tick" on its own. Time is advanced by explicit calls to the AdvanceTime() or SetTime() functions. This is intended to be used for dependency injection in tests to test how code behaves under simulated time conditions. PiperOrigin-RevId: 862858341 Change-Id: Ied9946dd84063c95505269971d3c996d4b66c6d8
72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// Copyright 2026 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/time/clock_interface.h"
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#include "absl/base/config.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/base/no_destructor.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/time/clock.h"
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#include "absl/time/time.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace {
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class RealTimeClock final : public Clock {
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private:
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#ifdef _MSC_VER
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// Disable MSVC warning "destructor never returns, potential memory leak"
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#pragma warning(push)
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#pragma warning(disable : 4722)
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#endif
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~RealTimeClock() override {
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ABSL_RAW_LOG(FATAL, "RealTimeClock should never be destroyed");
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}
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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public:
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absl::Time TimeNow() override { return absl::Now(); }
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void Sleep(absl::Duration d) override { absl::SleepFor(d); }
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void SleepUntil(absl::Time wakeup_time) override {
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absl::Duration d = wakeup_time - TimeNow();
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if (d > absl::ZeroDuration()) {
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Sleep(d);
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}
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}
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bool AwaitWithDeadline(absl::Mutex* mu, const absl::Condition& cond,
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absl::Time deadline) override {
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return mu->AwaitWithDeadline(cond, deadline);
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}
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};
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} // namespace
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Clock::~Clock() = default; // go/key-method
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Clock& Clock::GetRealClock() {
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static absl::NoDestructor<RealTimeClock> rtclock;
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return *rtclock;
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}
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ABSL_NAMESPACE_END
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} // namespace absl
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