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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_FILE_SYSTEM_QUOTA_OPEN_FILE_HANDLE_H_
#define STORAGE_BROWSER_FILE_SYSTEM_QUOTA_OPEN_FILE_HANDLE_H_
#include <stdint.h>
#include "base/component_export.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
namespace base {
class FilePath;
}
namespace storage {
class QuotaReservation;
class OpenFileHandleContext;
class QuotaReservationBuffer;
// Represents an open file like a file descriptor.
// This should be alive while a consumer keeps a file opened and should be
// deleted when the plugin closes the file.
class COMPONENT_EXPORT(STORAGE_BROWSER) OpenFileHandle {
public:
OpenFileHandle(const OpenFileHandle&) = delete;
OpenFileHandle& operator=(const OpenFileHandle&) = delete;
~OpenFileHandle();
// Updates cached file size and consumes quota for that.
// Both this and AddAppendModeWriteAmount should be called for each modified
// file before calling QuotaReservation::RefreshQuota and before closing the
// file.
void UpdateMaxWrittenOffset(int64_t offset);
// Notifies that |amount| of data is written to the file in append mode, and
// consumes quota for that.
// Both this and UpdateMaxWrittenOffset should be called for each modified
// file before calling QuotaReservation::RefreshQuota and before closing the
// file.
void AddAppendModeWriteAmount(int64_t amount);
// Returns the estimated file size for the quota consumption calculation.
// The client must consume its reserved quota when it writes data to the file
// beyond the estimated file size.
// The estimated file size is greater than or equal to actual file size after
// all clients report their file usage, and is monotonically increasing over
// OpenFileHandle object life cycle, so that client may cache the value.
int64_t GetEstimatedFileSize() const;
int64_t GetMaxWrittenOffset() const;
const base::FilePath& platform_path() const;
private:
friend class QuotaReservationBuffer;
OpenFileHandle(QuotaReservation* reservation, OpenFileHandleContext* context);
scoped_refptr<QuotaReservation> reservation_;
scoped_refptr<OpenFileHandleContext> context_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace storage
#endif // STORAGE_BROWSER_FILE_SYSTEM_QUOTA_OPEN_FILE_HANDLE_H_
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