1 /* 2 * Copyright (C) 2020 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 17 #ifndef ANDROID_MEDIA_UID_POLICY_INTERFACE_H 18 #define ANDROID_MEDIA_UID_POLICY_INTERFACE_H 19 20 #include <unordered_set> 21 22 namespace android { 23 24 class UidPolicyCallbackInterface; 25 26 // Interface for the controller to query a uid's info. 27 class UidPolicyInterface { 28 public: 29 // Instruct the uid policy to start monitoring a uid. 30 virtual void registerMonitorUid(uid_t uid) = 0; 31 // Instruct the uid policy to stop monitoring a uid. 32 virtual void unregisterMonitorUid(uid_t uid) = 0; 33 // Whether a uid is among the set of uids that's currently top priority. 34 virtual bool isUidOnTop(uid_t uid) = 0; 35 // Retrieves the set of uids that's currently top priority. 36 virtual std::unordered_set<uid_t> getTopUids() const = 0; 37 // Set the associated callback interface to send the events when uid states change. 38 virtual void setCallback(const std::shared_ptr<UidPolicyCallbackInterface>& cb) = 0; 39 40 protected: 41 virtual ~UidPolicyInterface() = default; 42 }; 43 44 // Interface for notifying the controller of a change in uid states. 45 class UidPolicyCallbackInterface { 46 public: 47 // Called when the set of uids that's top priority among the uids of interest 48 // has changed. The receiver of this callback should adjust accordingly. 49 virtual void onTopUidsChanged(const std::unordered_set<uid_t>& uids) = 0; 50 51 // Called when a uid is gone. 52 virtual void onUidGone(uid_t goneUid) = 0; 53 54 protected: 55 virtual ~UidPolicyCallbackInterface() = default; 56 }; 57 58 } // namespace android 59 #endif // ANDROID_MEDIA_UID_POLICY_INTERFACE_H 60