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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef STORAGE_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_H_
#define STORAGE_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_H_
#include "base/basictypes.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "storage/browser/fileapi/quota/quota_reservation_manager.h"
#include "storage/browser/storage_browser_export.h"
#include "storage/common/fileapi/file_system_types.h"
class GURL;
namespace storage {
class QuotaReservationBuffer;
class OpenFileHandle;
// Represents a unit of quota reservation.
class STORAGE_EXPORT QuotaReservation
: public base::RefCounted<QuotaReservation> {
public:
typedef base::Callback<void(base::File::Error error)> StatusCallback;
// Reclaims unused quota and reserves another |size| of quota. So that the
// resulting new |remaining_quota_| will be same as |size| as far as available
// space is enough. |remaining_quota_| may be less than |size| if there is
// not enough space available.
// Invokes |callback| upon completion.
void RefreshReservation(int64 size, const StatusCallback& callback);
// Associates |platform_path| to the QuotaReservation instance.
// Returns an OpenFileHandle instance that represents a quota managed file.
scoped_ptr<OpenFileHandle> GetOpenFileHandle(
const base::FilePath& platform_path);
// Should be called when the associated client is crashed.
// This implies the client can no longer report its consumption of the
// reserved quota.
// QuotaReservation puts all remaining quota to the QuotaReservationBuffer, so
// that the remaining quota will be reclaimed after all open files associated
// to the origin and type.
void OnClientCrash();
// Consumes |size| of reserved quota for a associated file.
// Consumed quota is sent to associated QuotaReservationBuffer for staging.
void ConsumeReservation(int64 size);
// Returns amount of unused reserved quota.
int64 remaining_quota() const { return remaining_quota_; }
QuotaReservationManager* reservation_manager();
const GURL& origin() const;
FileSystemType type() const;
private:
friend class QuotaReservationBuffer;
// Use QuotaReservationManager as the entry point.
explicit QuotaReservation(QuotaReservationBuffer* reservation_buffer);
friend class base::RefCounted<QuotaReservation>;
virtual ~QuotaReservation();
static bool AdaptDidUpdateReservedQuota(
const base::WeakPtr<QuotaReservation>& reservation,
int64 previous_size,
const StatusCallback& callback,
base::File::Error error,
int64 delta);
bool DidUpdateReservedQuota(int64 previous_size,
const StatusCallback& callback,
base::File::Error error,
int64 delta);
bool client_crashed_;
bool running_refresh_request_;
int64 remaining_quota_;
scoped_refptr<QuotaReservationBuffer> reservation_buffer_;
base::SequenceChecker sequence_checker_;
base::WeakPtrFactory<QuotaReservation> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(QuotaReservation);
};
} // namespace storage
#endif // STORAGE_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_H_