1 // Copyright (C) 2020 The Android Open Source Project 2 // 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 #pragma once 16 17 #include <mutex> 18 #include <vector> 19 20 // clang-format off 21 #include PATH(device/google/atv/audio_proxy/FILE_VERSION/IBusDevice.h) 22 // clang-format on 23 24 namespace audio_proxy { 25 namespace service { 26 27 using ::android::sp; 28 using ::android::hardware::hidl_death_recipient; 29 using ::android::hardware::hidl_string; 30 using ::device::google::atv::audio_proxy::CPP_VERSION::IBusDevice; 31 32 class BusDeviceProvider { 33 public: 34 BusDeviceProvider(); 35 ~BusDeviceProvider(); 36 37 // Register bus device under `address`. The device is unregistered when its 38 // process exits. 39 bool add(const hidl_string& address, sp<IBusDevice> device); 40 41 // Get IBusDevice with `address`. Caller should only keep the strong pointer 42 // shortly, a.k.a caller should release the strong pointer as soon as its 43 // function scope exits. 44 sp<IBusDevice> get(const hidl_string& address); 45 46 // Remove all the added devices. 47 void removeAll(); 48 49 private: 50 class DeathRecipient; 51 struct BusDeviceHolder { 52 sp<IBusDevice> device; 53 hidl_string address; 54 uint64_t token; 55 }; 56 57 friend class DeathRecipient; 58 59 // Called by DeathRecipient to remove device when the host process exits. 60 void removeByToken(uint64_t token); 61 62 sp<hidl_death_recipient> mDeathRecipient; 63 64 std::mutex mDevicesLock; 65 66 // Use a vector since we don't have too much registered devices. 67 std::vector<BusDeviceHolder> mBusDevices; 68 uint64_t mNextToken = 0; 69 }; 70 71 } // namespace service 72 } // namespace audio_proxy