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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TASK_SEQUENCE_MANAGER_TIME_DOMAIN_H_
#define BASE_TASK_SEQUENCE_MANAGER_TIME_DOMAIN_H_
#include <optional>
#include "base/base_export.h"
#include "base/check.h"
#include "base/memory/raw_ptr.h"
#include "base/task/common/lazy_now.h"
#include "base/task/sequence_manager/tasks.h"
#include "base/time/tick_clock.h"
#include "base/values.h"
namespace base {
namespace sequence_manager {
class SequenceManager;
namespace internal {
class SequenceManagerImpl;
} // namespace internal
// TimeDomain allows subclasses to enable clock overriding
// (e.g. auto-advancing virtual time, throttled clock, etc).
class BASE_EXPORT TimeDomain : public TickClock {
public:
TimeDomain(const TimeDomain&) = delete;
TimeDomain& operator=(const TimeDomain&) = delete;
~TimeDomain() override = default;
// Invoked when the thread reaches idle. Gives an opportunity to a virtual
// time domain impl to fast-forward time and return true to indicate that
// there's more work to run. If RunLoop::QuitWhenIdle has been called then
// `quit_when_idle_requested` will be true.
virtual bool MaybeFastForwardToWakeUp(std::optional<WakeUp> next_wake_up,
bool quit_when_idle_requested) = 0;
// Debug info.
Value::Dict AsValue() const;
protected:
TimeDomain() = default;
virtual const char* GetName() const = 0;
// Tells SequenceManager that internal policy might have changed to
// re-evaluate MaybeFastForwardToWakeUp().
void NotifyPolicyChanged();
// Called when the TimeDomain is assigned to a SequenceManagerImpl.
// `sequence_manager` is expected to be valid for the duration of TimeDomain's
// existence. TODO(scheduler-dev): Pass SequenceManager in the constructor.
void OnAssignedToSequenceManager(
internal::SequenceManagerImpl* sequence_manager);
private:
friend class internal::SequenceManagerImpl;
raw_ptr<internal::SequenceManagerImpl, DanglingUntriaged> sequence_manager_ =
nullptr;
};
} // namespace sequence_manager
} // namespace base
#endif // BASE_TASK_SEQUENCE_MANAGER_TIME_DOMAIN_H_
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