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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_QUOTA_QUOTA_TASK_H_
#define STORAGE_BROWSER_QUOTA_QUOTA_TASK_H_
#include <set>
#include "base/compiler_specific.h"
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner_helpers.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace storage {
class QuotaTaskObserver;
// A base class for quota tasks.
//
// Instances of this class own themselves and schedule themselves for deletion
// when async tasks are either aborted or completed.
// This class is not thread-safe and it's subclasses need not be either.
// CallCompleted(), Abort(), and DeleteSoon() must be called on the same thread
// that is the constructor is called on.
// TODO(kinuko): Revise this using base::OnceCallback.
class QuotaTask {
public:
QuotaTask(const QuotaTask&) = delete;
QuotaTask& operator=(const QuotaTask&) = delete;
void Start();
protected:
explicit QuotaTask(QuotaTaskObserver* observer);
virtual ~QuotaTask();
// The task body.
virtual void Run() = 0;
// Called upon completion, on the original message loop.
virtual void Completed() = 0;
// Called when the task is aborted.
virtual void Aborted() {}
void CallCompleted();
// Call this to delete itself.
void DeleteSoon();
QuotaTaskObserver* observer() const { return observer_; }
private:
friend class base::DeleteHelper<QuotaTask>;
friend class QuotaTaskObserver;
void Abort();
raw_ptr<QuotaTaskObserver,
FlakyDanglingUntriaged | AcrossTasksDanglingUntriaged>
observer_;
const scoped_refptr<base::SingleThreadTaskRunner> original_task_runner_;
bool delete_scheduled_;
};
class COMPONENT_EXPORT(STORAGE_BROWSER) QuotaTaskObserver {
protected:
friend class QuotaTask;
QuotaTaskObserver();
virtual ~QuotaTaskObserver();
void RegisterTask(QuotaTask* task);
void UnregisterTask(QuotaTask* task);
std::set<raw_ptr<QuotaTask, SetExperimental>> running_quota_tasks_;
};
}
#endif // STORAGE_BROWSER_QUOTA_QUOTA_TASK_H_
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