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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 WEBKIT_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_BUFFER_H_
#define WEBKIT_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_BUFFER_H_
#include <map>
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/platform_file.h"
#include "url/gurl.h"
#include "webkit/browser/webkit_storage_browser_export.h"
#include "webkit/common/fileapi/file_system_types.h"
namespace fileapi {
class QuotaReservation;
class OpenFileHandle;
class OpenFileHandleContext;
class QuotaReservationManager;
// QuotaReservationBuffer manages QuotaReservation instances. All consumed
// quota and leaked quota by associated QuotaReservation will be staged in
// QuotaReservationBuffer, and will be committed on a modified file is closed.
// The instance keeps alive while any associated QuotaReservation or
// OpenFileHandle alive.
// This class is usually manipulated only via OpenFileHandle and
// QuotaReservation.
class QuotaReservationBuffer : public base::RefCounted<QuotaReservationBuffer> {
public:
QuotaReservationBuffer(
base::WeakPtr<QuotaReservationManager> reservation_manager,
const GURL& origin,
FileSystemType type);
scoped_refptr<QuotaReservation> CreateReservation();
scoped_ptr<OpenFileHandle> GetOpenFileHandle(
QuotaReservation* reservation,
const base::FilePath& platform_path);
void CommitFileGrowth(int64 quota_consumption, int64 usage_delta);
void DetachOpenFileHandleContext(OpenFileHandleContext* context);
void PutReservationToBuffer(int64 size);
QuotaReservationManager* reservation_manager() {
return reservation_manager_.get();
}
const GURL& origin() const { return origin_; }
FileSystemType type() const { return type_; }
private:
friend class base::RefCounted<QuotaReservationBuffer>;
virtual ~QuotaReservationBuffer();
static bool DecrementDirtyCount(
base::WeakPtr<QuotaReservationManager> reservation_manager,
const GURL& origin,
FileSystemType type,
base::PlatformFileError error);
typedef std::map<base::FilePath, OpenFileHandleContext*>
OpenFileHandleContextByPath;
// Not owned. The destructor of OpenFileHandler should erase itself from
// |open_files_|.
OpenFileHandleContextByPath open_files_;
base::WeakPtr<QuotaReservationManager> reservation_manager_;
GURL origin_;
fileapi::FileSystemType type_;
int64 reserved_quota_;
base::SequenceChecker sequence_checker_;
DISALLOW_COPY_AND_ASSIGN(QuotaReservationBuffer);
};
} // namespace fileapi
#endif // WEBKIT_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_BUFFER_H_
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