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// Copyright (c) 2012 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_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_
#define WEBKIT_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_
#include <map>
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "base/platform_file.h"
#include "base/task/sequenced_task_runner.h"
#include "base/timer.h"
#include "webkit/storage/webkit_storage_export.h"
namespace fileapi {
class WEBKIT_STORAGE_EXPORT_PRIVATE FileSystemUsageCache {
public:
explicit FileSystemUsageCache(base::SequencedTaskRunner* task_runner);
~FileSystemUsageCache();
// Gets the size described in the .usage file even if dirty > 0 or
// is_valid == false. Returns true if the .usage file is available.
bool GetUsage(const base::FilePath& usage_file_path, int64* usage);
// Gets the dirty count in the .usage file.
// Returns true if the .usage file is available.
bool GetDirty(const base::FilePath& usage_file_path, uint32* dirty);
// Increments or decrements the "dirty" entry in the .usage file.
// Returns false if no .usage is available.
bool IncrementDirty(const base::FilePath& usage_file_path);
bool DecrementDirty(const base::FilePath& usage_file_path);
// Notifies quota system that it needs to recalculate the usage cache of the
// origin. Returns false if no .usage is available.
bool Invalidate(const base::FilePath& usage_file_path);
bool IsValid(const base::FilePath& usage_file_path);
// Updates the size described in the .usage file.
bool UpdateUsage(const base::FilePath& usage_file_path, int64 fs_usage);
// Updates the size described in the .usage file by delta with keeping dirty
// even if dirty > 0.
bool AtomicUpdateUsageByDelta(const base::FilePath& usage_file_path,
int64 delta);
bool Exists(const base::FilePath& usage_file_path);
bool Delete(const base::FilePath& usage_file_path);
void CloseCacheFiles();
static const base::FilePath::CharType kUsageFileName[];
static const char kUsageFileHeader[];
static const int kUsageFileSize;
static const int kUsageFileHeaderSize;
private:
typedef std::map<base::FilePath, base::PlatformFile> CacheFiles;
// Read the size, validity and the "dirty" entry described in the .usage file.
// Returns less than zero if no .usage file is available.
bool Read(const base::FilePath& usage_file_path,
bool* is_valid,
uint32* dirty,
int64* usage);
bool Write(const base::FilePath& usage_file_path,
bool is_valid,
int32 dirty,
int64 fs_usage);
bool GetPlatformFile(const base::FilePath& file_path,
base::PlatformFile* file);
bool ReadBytes(const base::FilePath& file_path,
char* buffer,
int64 buffer_size);
bool WriteBytes(const base::FilePath& file_path,
const char* buffer,
int64 buffer_size);
bool FlushFile(const base::FilePath& file_path);
void ScheduleCloseTimer();
bool HasCacheFileHandle(const base::FilePath& file_path);
bool CalledOnValidThread();
base::OneShotTimer<FileSystemUsageCache> timer_;
std::map<base::FilePath, base::PlatformFile> cache_files_;
base::WeakPtrFactory<FileSystemUsageCache> weak_factory_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
DISALLOW_COPY_AND_ASSIGN(FileSystemUsageCache);
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_FILE_SYSTEM_USAGE_CACHE_H_
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