Yifan Hong | 84888d3 | 2017-02-06 15:32:41 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #ifndef ANDROID_HIDL_CONCURRENT_MAP_H |
| 17 | #define ANDROID_HIDL_CONCURRENT_MAP_H |
| 18 | |
| 19 | #include <mutex> |
| 20 | #include <map> |
| 21 | |
| 22 | namespace android { |
| 23 | namespace hardware { |
| 24 | |
| 25 | template<typename K, typename V> |
| 26 | class ConcurrentMap { |
| 27 | private: |
| 28 | using size_type = typename std::map<K, V>::size_type; |
| 29 | using iterator = typename std::map<K, V>::iterator; |
| 30 | using const_iterator = typename std::map<K, V>::const_iterator; |
| 31 | |
| 32 | public: |
| 33 | void set(K &&k, V &&v) { |
| 34 | std::unique_lock<std::mutex> _lock(mMutex); |
| 35 | mMap[std::forward<K>(k)] = std::forward<V>(v); |
| 36 | } |
| 37 | |
| 38 | // get with the given default value. |
| 39 | const V &get(const K &k, const V &def) const { |
| 40 | std::unique_lock<std::mutex> _lock(mMutex); |
| 41 | const_iterator iter = mMap.find(k); |
| 42 | if (iter == mMap.end()) { |
| 43 | return def; |
| 44 | } |
| 45 | return iter->second; |
| 46 | } |
| 47 | |
| 48 | size_type erase(const K &k) { |
| 49 | std::unique_lock<std::mutex> _lock(mMutex); |
| 50 | return mMap.erase(k); |
| 51 | } |
| 52 | |
| 53 | private: |
| 54 | mutable std::mutex mMutex; |
| 55 | std::map<K, V> mMap; |
| 56 | }; |
| 57 | |
| 58 | } // namespace hardware |
| 59 | } // namespace android |
| 60 | |
| 61 | |
| 62 | #endif // ANDROID_HIDL_CONCURRENT_MAP_H |