| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef MINIKIN_LOCALE_LIST_CACHE_H |
| #define MINIKIN_LOCALE_LIST_CACHE_H |
| |
| #include <mutex> |
| #include <unordered_map> |
| |
| #include "minikin/Buffer.h" |
| #include "minikin/Macros.h" |
| |
| #include "Locale.h" |
| |
| namespace minikin { |
| |
| class LocaleListCache { |
| public: |
| // A special ID for the invalid locale list. |
| const static uint32_t kInvalidListId = (uint32_t)(-1); |
| |
| // Returns the locale list ID for the given string representation of LocaleList. |
| static inline uint32_t getId(const std::string& locales) { |
| return getInstance().getIdInternal(locales); |
| } |
| |
| // Returns the locale list ID for the LocaleList serialized in the buffer. |
| static inline uint32_t readFrom(BufferReader* reader) { |
| return getInstance().readFromInternal(reader); |
| } |
| |
| static inline void writeTo(BufferWriter* writer, uint32_t id) { |
| return getInstance().writeToInternal(writer, id); |
| } |
| |
| static inline const LocaleList& getById(uint32_t id) { |
| return getInstance().getByIdInternal(id); |
| } |
| |
| private: |
| struct LocaleVectorHash { |
| size_t operator()(const std::vector<Locale>& locales) const; |
| }; |
| |
| LocaleListCache(); // Singleton |
| ~LocaleListCache() {} |
| |
| uint32_t getIdInternal(const std::string& locales); |
| uint32_t getIdInternal(std::vector<Locale>&& locales) EXCLUSIVE_LOCKS_REQUIRED(mMutex); |
| uint32_t readFromInternal(BufferReader* reader); |
| void writeToInternal(BufferWriter* writer, uint32_t id); |
| const LocaleList& getByIdInternal(uint32_t id); |
| |
| // Caller should acquire a lock before calling the method. |
| static LocaleListCache& getInstance() { |
| static LocaleListCache instance; |
| return instance; |
| } |
| |
| std::vector<LocaleList> mLocaleLists GUARDED_BY(mMutex); |
| |
| // A map from the list of locale identifier to the ID. |
| // |
| // Locale's operator==() doesn't have reflexivity for unsupported locales, |
| // but it won't cause problems because we never store unsupported locales in |
| // LocaleListCache. See parseLocaleList() in LocaleListCache.cpp. |
| std::unordered_map<std::vector<Locale>, uint32_t, LocaleVectorHash> mLocaleListLookupTable |
| GUARDED_BY(mMutex); |
| |
| // A cache map from the string representation of the font locale list to the ID. |
| // This is a mere cache over mLocaleListLookupTable. Some LocaleList objects may be in |
| // mLocaleListLookupTable even if they are not in mLocaleListStringCache. |
| std::unordered_map<std::string, uint32_t> mLocaleListStringCache GUARDED_BY(mMutex); |
| |
| std::mutex mMutex; |
| }; |
| |
| } // namespace minikin |
| |
| #endif // MINIKIN_LOCALE_LIST_CACHE_H |