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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 WEBKIT_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
#define WEBKIT_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/supports_user_data.h"
#include "webkit/browser/storage_export.h"
namespace base {
class SequencedTaskRunner;
}
namespace storage {
class BlobData;
class BlobStorageContext;
// A scoper object for use in chrome's main browser process, ensures
// the underlying BlobData and its uuid remain in BlobStorageContext's
// collection for the duration. This object has delete semantics and
// maybe deleted on any thread.
class STORAGE_EXPORT BlobDataHandle
: public base::SupportsUserData::Data {
public:
BlobDataHandle(const BlobDataHandle& other); // May be copied on any thread.
virtual ~BlobDataHandle(); // Maybe be deleted on any thread.
BlobData* data() const; // May only be accessed on the IO thread.
std::string uuid() const; // May be accessed on any thread.
private:
class BlobDataHandleShared
: public base::RefCountedThreadSafe<BlobDataHandleShared> {
public:
BlobDataHandleShared(BlobData* blob_data,
BlobStorageContext* context,
base::SequencedTaskRunner* task_runner);
BlobData* data() const;
const std::string& uuid() const;
private:
friend class base::DeleteHelper<BlobDataHandleShared>;
friend class base::RefCountedThreadSafe<BlobDataHandleShared>;
friend class BlobDataHandle;
virtual ~BlobDataHandleShared();
scoped_refptr<BlobData> blob_data_;
base::WeakPtr<BlobStorageContext> context_;
DISALLOW_COPY_AND_ASSIGN(BlobDataHandleShared);
};
friend class BlobStorageContext;
BlobDataHandle(BlobData* blob_data, BlobStorageContext* context,
base::SequencedTaskRunner* task_runner);
scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
scoped_refptr<BlobDataHandleShared> shared_;
};
} // namespace storage
#endif // WEBKIT_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
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