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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_METADATA_METADATA_CACHE_H_
#define UI_BASE_METADATA_METADATA_CACHE_H_
#include <memory>
#include <utility>
#include <vector>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "ui/base/metadata/metadata_types.h"
namespace ui {
namespace metadata {
class ClassMetaData;
// The MetaDataCache speeds up frequent traversals over the meta data for
// various classes by caching one instance of ClassMetaData for each class on
// which metadata is required.
// MetaDataCache is implemented as a singleton. This also implies that each
// instance of ClassMetaData registered into the cache represents one and only
// one class type.
class COMPONENT_EXPORT(UI_BASE_METADATA) MetaDataCache {
public:
MetaDataCache();
MetaDataCache(const MetaDataCache&) = delete;
MetaDataCache& operator=(const MetaDataCache&) = delete;
static MetaDataCache* GetInstance();
void AddClassMetaData(std::unique_ptr<ClassMetaData> class_data);
std::vector<raw_ptr<ClassMetaData, VectorExperimental>>& GetCachedTypes();
private:
~MetaDataCache();
std::vector<raw_ptr<ClassMetaData, VectorExperimental>> class_data_cache_;
};
// These functions are rarely called directly, rather they are called from
// within the macros used to declare the metadata for a class. See the macros in
// reflections_macros.h
//
// Registers the class metadata into the global cache. Will DCHECK if the
// metadata for a class is already registered.
COMPONENT_EXPORT(UI_BASE_METADATA)
void RegisterClassInfo(std::unique_ptr<ClassMetaData> meta_data);
// Help function for creating and registering the metadata container into the
// global cache for a given class. The metadata information is owned by the
// given class.
template <typename TMetaData>
ClassMetaData* MakeAndRegisterClassInfo() {
std::unique_ptr<TMetaData> class_meta_data = std::make_unique<TMetaData>();
TMetaData* const ret = class_meta_data.get();
RegisterClassInfo(std::move(class_meta_data));
return ret;
}
} // namespace metadata
} // namespace ui
#endif // UI_BASE_METADATA_METADATA_CACHE_H_
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