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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_MEMORY_PRESSURE_SYSTEM_MEMORY_PRESSURE_EVALUATOR_MAC_H_
#define COMPONENTS_MEMORY_PRESSURE_SYSTEM_MEMORY_PRESSURE_EVALUATOR_MAC_H_
#include <CoreFoundation/CFDate.h>
#include <dispatch/dispatch.h>
#include "base/apple/scoped_cftyperef.h"
#include "base/apple/scoped_dispatch_object.h"
#include "base/files/file_path.h"
#include "base/message_loop/message_pump_apple.h"
#include "base/sequence_checker.h"
#include "base/system/sys_info.h"
#include "base/timer/timer.h"
#include "components/memory_pressure/memory_pressure_voter.h"
#include "components/memory_pressure/system_memory_pressure_evaluator.h"
namespace memory_pressure {
namespace mac {
class TestSystemMemoryPressureEvaluator;
// Declares the interface for the Mac SystemMemoryPressureEvaluator, which
// reports memory pressure events and status.
class SystemMemoryPressureEvaluator
: public memory_pressure::SystemMemoryPressureEvaluator {
public:
explicit SystemMemoryPressureEvaluator(
std::unique_ptr<MemoryPressureVoter> voter);
~SystemMemoryPressureEvaluator() override;
SystemMemoryPressureEvaluator(const SystemMemoryPressureEvaluator&) = delete;
SystemMemoryPressureEvaluator& operator=(
const SystemMemoryPressureEvaluator&) = delete;
private:
friend TestSystemMemoryPressureEvaluator;
static base::MemoryPressureListener::MemoryPressureLevel
MemoryPressureLevelForMacMemoryPressureLevel(int mac_memory_pressure_level);
// Returns the raw memory pressure level from the macOS. Exposed for
// unit testing.
virtual int GetMacMemoryPressureLevel();
// Updates |last_pressure_level_| with the current memory pressure level.
void UpdatePressureLevel();
// Run |dispatch_callback| on memory pressure notifications from the OS.
void OnMemoryPressureChanged();
// Periodically checks the amount of free disk space.
void CheckDiskSpace();
// Callback for the disk space check. Updates the pressure level based on the
// amount of free space.
void OnDiskSpaceCheckComplete(int64_t free_bytes);
// Updates the pressure level and manages re-notification timers.
void UpdatePressureAndManageNotifications();
// The dispatch source that generates memory pressure change notifications.
base::apple::ScopedDispatchObject<dispatch_source_t>
memory_level_event_source_;
// Timer that will re-notify with the current vote at regular interval.
base::RepeatingTimer renotify_current_vote_timer_;
// A task runner that can be used for blocking tasks.
scoped_refptr<base::SequencedTaskRunner> disk_check_task_runner_;
// The timer that periodically triggers a disk space check.
base::RepeatingTimer disk_space_check_timer_;
// The pressure level calculated from the available disk space.
base::MemoryPressureListener::MemoryPressureLevel disk_pressure_vote_ =
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE;
// The path to the user data directory, used for the disk space check.
base::FilePath user_data_dir_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<SystemMemoryPressureEvaluator> weak_ptr_factory_;
};
} // namespace mac
} // namespace memory_pressure
#endif // COMPONENTS_MEMORY_PRESSURE_SYSTEM_MEMORY_PRESSURE_EVALUATOR_MAC_H_
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