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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 COMPONENTS_DOWNLOAD_PUBLIC_TASK_TASK_MANAGER_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_TASK_TASK_MANAGER_H_
#include <stdint.h>
#include "base/component_export.h"
#include "base/functional/callback.h"
#include "components/download/public/task/download_task_types.h"
namespace download {
using TaskFinishedCallback = base::OnceCallback<void(bool)>;
// A class to manage the calls made to the TaskScheduler, that abstracts away
// the details of the TaskScheduler from the calling code. The tasks can run
// independently of each other as long as they have different |task_type|.
// Scheduling another task of same |task_type| before the task is started will
// overwrite the params of the scheduled task.
class COMPONENT_EXPORT(COMPONENTS_DOWNLOAD_PUBLIC_TASK) TaskManager {
public:
// Params used when scheduling a task through TaskScheduler::ScheduleTask().
struct COMPONENT_EXPORT(COMPONENTS_DOWNLOAD_PUBLIC_TASK) TaskParams {
TaskParams();
~TaskParams() = default;
bool operator==(const TaskParams& other) const;
bool require_unmetered_network;
bool require_charging;
int optimal_battery_percentage;
int64_t window_start_time_seconds;
int64_t window_end_time_seconds;
};
TaskManager() = default;
TaskManager(const TaskManager&) = delete;
TaskManager& operator=(const TaskManager&) = delete;
virtual ~TaskManager() = default;
// Called to schedule a new task. Overwrites the params if a task of the same
// type is already scheduled. If the task is currently running, it will cache
// the params and schedule the task after the completion/stopping of the
// current task.
virtual void ScheduleTask(DownloadTaskType task_type,
const TaskParams& params) = 0;
// Called to unschedule a scheduled task of the given type if it is not yet
// started. Doesn't cancel the currently running task.
virtual void UnscheduleTask(DownloadTaskType task_type) = 0;
// Called when the system starts a scheduled task. The callback will be cached
// by the class and run after receiving a call to NotifyTaskFinished().
virtual void OnStartScheduledTask(DownloadTaskType task_type,
TaskFinishedCallback callback) = 0;
// Called when the system decides to stop an already running task.
virtual void OnStopScheduledTask(DownloadTaskType task_type) = 0;
// Should be called once the task is complete. The callback passed through
// OnStartScheduledTask() will be run in order to notify that the task is
// done. If there are pending params for a new task, a new task will be
// scheduled immediately.
//
// Most caller should set |needs_reschedule| to false. The OS will reschedule
// the task with the original params but with a OS controlled back off time if
// |needs_reschedule| is true.
virtual void NotifyTaskFinished(DownloadTaskType task_type,
bool needs_reschedule) = 0;
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_TASK_TASK_MANAGER_H_
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