1 /* 2 * Copyright (c) 2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef DYNAMIC_CACHE_H 17 #define DYNAMIC_CACHE_H 18 19 #include <map> 20 #include <string> 21 #include "iremote_object.h" 22 23 namespace OHOS { 24 using namespace std; 25 class DynamicCache : public IRemoteObject::DeathRecipient { 26 public: 27 OnRemoteDied(const wptr<IRemoteObject> & remote)28 void OnRemoteDied(const wptr<IRemoteObject>& remote) override 29 { 30 ClearCache(); 31 } 32 33 sptr<IRemoteObject> QueryResult(int32_t querySaId, int32_t code); 34 bool CanUseCache(int32_t querySaId, char* waterLine, std::string defaultValue); 35 ClearCache()36 void __attribute__((no_sanitize("cfi"))) ClearCache() 37 { 38 std::lock_guard<std::mutex> autoLock(queryCacheLock_); 39 if (lastQuerySaProxy_ != nullptr) { 40 lastQuerySaProxy_->RemoveDeathRecipient(this); 41 } 42 lastQuerySaId_ = -1; 43 lastQuerySaProxy_ = nullptr; 44 } 45 46 bool InvalidateCache(); 47 bool SetKey(const std::string& key); Recompute(int32_t querySaId,int32_t code)48 virtual sptr<IRemoteObject> Recompute(int32_t querySaId, int32_t code) 49 { 50 std::lock_guard<std::mutex> autoLock(queryCacheLock_); 51 if (lastQuerySaId_ != querySaId) { 52 return nullptr; 53 } 54 return lastQuerySaProxy_; 55 } 56 57 private: 58 std::mutex queryCacheLock_; 59 std::map<std::string, std::string> localPara_; 60 std::string key_; 61 int32_t lastQuerySaId_; 62 sptr<IRemoteObject> lastQuerySaProxy_; 63 }; 64 } // namespace OHOS 65 #endif /* DYNAMIC_CACHE_H */