1 /* 2 * Copyright (C) 2017 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 specic language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_LIBPERFMGR_REQUESTGROUP_H_ 18 #define ANDROID_LIBPERFMGR_REQUESTGROUP_H_ 19 20 #include <chrono> 21 #include <map> 22 #include <string> 23 24 namespace android { 25 namespace perfmgr { 26 27 using ReqTime = std::chrono::time_point<std::chrono::steady_clock>; 28 29 // The RequestGroup type represents the set of requests for a given value on a 30 // particular sysfs node, and the interface is simple: there is a function to 31 // add requests, a function to remove requests, and a function to check for the 32 // next expiration time if there is an outstanding request, and a function to 33 // check the requested value. There may only be one request per PowerHint, so 34 // the representation is simple: a map from PowerHint to the expiration time for 35 // that hint. 36 class RequestGroup { 37 public: 38 RequestGroup(std::string request_value) 39 : request_value_(std::move(request_value)) {} 40 41 // Remove expired request in the map and return true when request_map_ is 42 // not empty, false when request_map_ is empty; also update expire_time with 43 // nearest timeout in request_map_ or std::chrono::milliseconds::max() when 44 // request_map_ is empty. 45 bool GetExpireTime(std::chrono::milliseconds* expire_time); 46 // Return the request value. 47 std::string GetRequestValue() const; 48 // Return true for adding request, false for extending expire time of 49 // existing active request on given hint_type. 50 bool AddRequest(const std::string& hint_type, ReqTime end_time); 51 // Return true for removing request, false if request is not active on given 52 // hint_type. If request exits and the new end_time is less than the active 53 // time, expire time will not be updated; also returns false. 54 bool RemoveRequest(const std::string& hint_type); 55 56 private: 57 const std::string request_value_; 58 std::map<std::string, ReqTime> request_map_; 59 }; 60 61 } // namespace perfmgr 62 } // namespace android 63 64 #endif // ANDROID_LIBPERFMGR_REQUESTGROUP_H_ 65
