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// Copyright (c) 2011 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_BLOB_BLOB_STORAGE_CONTROLLER_H_
#define WEBKIT_BLOB_BLOB_STORAGE_CONTROLLER_H_
#include <map>
#include <string>
#include "base/hash_tables.h"
#include "base/memory/ref_counted.h"
#include "base/process.h"
#include "webkit/blob/blob_data.h"
#include "webkit/storage/webkit_storage_export.h"
class GURL;
namespace base {
class FilePath;
class Time;
}
namespace webkit_blob {
// This class handles the logistics of blob Storage within the browser process.
class WEBKIT_STORAGE_EXPORT BlobStorageController {
public:
BlobStorageController();
~BlobStorageController();
void StartBuildingBlob(const GURL& url);
void AppendBlobDataItem(const GURL& url, const BlobData::Item& data_item);
void FinishBuildingBlob(const GURL& url, const std::string& content_type);
void AddFinishedBlob(const GURL& url, const BlobData* blob_data);
void CloneBlob(const GURL& url, const GURL& src_url);
void RemoveBlob(const GURL& url);
BlobData* GetBlobDataFromUrl(const GURL& url);
private:
friend class ViewBlobInternalsJob;
typedef base::hash_map<std::string, scoped_refptr<BlobData> > BlobMap;
typedef std::map<BlobData*, int> BlobDataUsageMap;
void AppendStorageItems(BlobData* target_blob_data,
BlobData* src_blob_data,
uint64 offset,
uint64 length);
void AppendFileItem(BlobData* target_blob_data,
const base::FilePath& file_path, uint64 offset,
uint64 length,
const base::Time& expected_modification_time);
void AppendFileSystemFileItem(
BlobData* target_blob_data,
const GURL& url, uint64 offset, uint64 length,
const base::Time& expected_modification_time);
bool RemoveFromMapHelper(BlobMap* map, const GURL& url);
void IncrementBlobDataUsage(BlobData* blob_data);
// Returns true if no longer in use.
bool DecrementBlobDataUsage(BlobData* blob_data);
BlobMap blob_map_;
BlobMap unfinalized_blob_map_;
// Used to keep track of how much memory is being utitlized for blob data,
// we count only the items of TYPE_DATA which are held in memory and not
// items of TYPE_FILE.
int64 memory_usage_;
// Multiple urls can refer to the same blob data, this map keeps track of
// how many urls refer to a BlobData.
BlobDataUsageMap blob_data_usage_count_;
DISALLOW_COPY_AND_ASSIGN(BlobStorageController);
};
} // namespace webkit_blob
#endif // WEBKIT_BLOB_BLOB_STORAGE_CONTROLLER_H_
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