chromium/components/services/storage/dom_storage/session_storage_data_map.h

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_SERVICES_STORAGE_DOM_STORAGE_SESSION_STORAGE_DATA_MAP_H_
#define COMPONENTS_SERVICES_STORAGE_DOM_STORAGE_SESSION_STORAGE_DATA_MAP_H_

#include <memory>
#include <vector>

#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "components/services/storage/dom_storage/session_storage_metadata.h"
#include "components/services/storage/dom_storage/storage_area_impl.h"

namespace storage {

class AsyncDomStorageDatabase;

// Holds the StorageArea for a session storage data map. Every
// namespace-origin area has a data map. To support shallow copying of the data
// (copy-on-write), a single data map can be shared between multiple namespaces.
// Thus this class is refcounted. This class has a one-to-one relationship with
// the SessionStorageMetadata::MapData object, accessible from
// |map_data()|.
//
// Neither this data map nor the inner StorageArea is bound to, as it needs
// to be shared between multiple connections if it is shallow-copied. However,
// it does allow it's user to keep track of the number of binding using
// |binding_count()|, |AddBindingReference()|, and |RemoveBindingReference()|.
class SessionStorageDataMap final
    : public StorageAreaImpl::Delegate,
      public base::RefCounted<SessionStorageDataMap> { … };

}  // namespace storage

#endif  // COMPONENTS_SERVICES_STORAGE_DOM_STORAGE_SESSION_STORAGE_DATA_MAP_H_