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// Copyright (c) 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_BLOB_BLOB_STORAGE_CONTEXT_H_
#define STORAGE_BROWSER_BLOB_BLOB_STORAGE_CONTEXT_H_
#include <map>
#include <string>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "storage/browser/blob/blob_data_handle.h"
#include "storage/browser/storage_browser_export.h"
#include "storage/common/blob/blob_data.h"
class GURL;
namespace base {
class FilePath;
class Time;
}
namespace content {
class BlobStorageHost;
}
namespace storage {
class BlobDataHandle;
// This class handles the logistics of blob Storage within the browser process,
// and maintains a mapping from blob uuid to the data. The class is single
// threaded and should only be used on the IO thread.
// In chromium, there is one instance per profile.
class STORAGE_EXPORT BlobStorageContext
: public base::SupportsWeakPtr<BlobStorageContext> {
public:
BlobStorageContext();
~BlobStorageContext();
scoped_ptr<BlobDataHandle> GetBlobDataFromUUID(const std::string& uuid);
scoped_ptr<BlobDataHandle> GetBlobDataFromPublicURL(const GURL& url);
// Useful for coining blobs from within the browser process. If the
// blob cannot be added due to memory consumption, returns NULL.
scoped_ptr<BlobDataHandle> AddFinishedBlob(const BlobData* blob_data);
// Useful for coining blob urls from within the browser process.
bool RegisterPublicBlobURL(const GURL& url, const std::string& uuid);
void RevokePublicBlobURL(const GURL& url);
private:
friend class content::BlobStorageHost;
friend class BlobDataHandle::BlobDataHandleShared;
friend class ViewBlobInternalsJob;
enum EntryFlags {
BEING_BUILT = 1 << 0,
EXCEEDED_MEMORY = 1 << 1,
};
struct BlobMapEntry {
int refcount;
int flags;
scoped_refptr<BlobData> data;
BlobMapEntry();
BlobMapEntry(int refcount, int flags, BlobData* data);
~BlobMapEntry();
};
typedef std::map<std::string, BlobMapEntry>
BlobMap;
typedef std::map<GURL, std::string> BlobURLMap;
void StartBuildingBlob(const std::string& uuid);
void AppendBlobDataItem(const std::string& uuid,
const BlobData::Item& data_item);
void FinishBuildingBlob(const std::string& uuid, const std::string& type);
void CancelBuildingBlob(const std::string& uuid);
void IncrementBlobRefCount(const std::string& uuid);
void DecrementBlobRefCount(const std::string& uuid);
bool ExpandStorageItems(BlobData* target_blob_data,
BlobData* src_blob_data,
uint64 offset,
uint64 length);
bool AppendBytesItem(BlobData* target_blob_data,
const char* data, int64 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 IsInUse(const std::string& uuid);
bool IsBeingBuilt(const std::string& uuid);
bool IsUrlRegistered(const GURL& blob_url);
BlobMap blob_map_;
BlobURLMap public_blob_urls_;
// Used to keep track of how much memory is being utilized 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_;
DISALLOW_COPY_AND_ASSIGN(BlobStorageContext);
};
} // namespace storage
#endif // STORAGE_BROWSER_BLOB_BLOB_STORAGE_CONTEXT_H_
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