1 /* 2 * Copyright (C) 2022 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 #pragma once 18 19 #include <android-base/thread_annotations.h> 20 #include <android/net/mdns/aidl/IMDnsEventListener.h> 21 22 #include <set> 23 24 class MDnsEventReporter final { 25 public: 26 class EventListener : public android::IBinder::DeathRecipient { 27 public: EventListener(MDnsEventReporter * eventReporter,const android::sp<android::net::mdns::aidl::IMDnsEventListener> & listener)28 EventListener(MDnsEventReporter* eventReporter, 29 const android::sp<android::net::mdns::aidl::IMDnsEventListener>& listener) 30 : mEventReporter(eventReporter), mListener(listener) {} 31 ~EventListener() override = default; binderDied(const android::wp<android::IBinder> &)32 void binderDied(const android::wp<android::IBinder>& /* who */) override { 33 mEventReporter->removeEventListenerImpl(mListener); 34 } getListener()35 android::sp<android::net::mdns::aidl::IMDnsEventListener> getListener() { 36 return mListener; 37 } 38 39 private: 40 MDnsEventReporter* mEventReporter; 41 android::sp<android::net::mdns::aidl::IMDnsEventListener> mListener; 42 }; 43 44 MDnsEventReporter(const MDnsEventReporter&) = delete; 45 MDnsEventReporter& operator=(const MDnsEventReporter&) = delete; 46 47 using EventListenerSet = std::set<android::sp<EventListener>>; 48 49 // Get the instance of the singleton MDnsEventReporter. 50 static MDnsEventReporter& getInstance(); 51 52 // Return registered binder services from the singleton MDnsEventReporter. This method is 53 // threadsafe. 54 const EventListenerSet& getEventListeners() const REQUIRES(mMutex); 55 56 // Add the binder to the singleton MDnsEventReporter. This method is threadsafe. 57 int addEventListener(const android::sp<android::net::mdns::aidl::IMDnsEventListener>& listener); 58 59 // Remove the binder from the singleton MDnsEventReporter. This method is threadsafe. 60 int removeEventListener( 61 const android::sp<android::net::mdns::aidl::IMDnsEventListener>& listener); 62 63 mutable std::mutex mMutex; 64 65 private: 66 MDnsEventReporter() = default; 67 ~MDnsEventReporter() = default; 68 69 EventListenerSet mEventListeners GUARDED_BY(mMutex); 70 71 int addEventListenerImpl( 72 const android::sp<android::net::mdns::aidl::IMDnsEventListener>& listener) 73 EXCLUDES(mMutex); 74 int removeEventListenerImpl( 75 const android::sp<android::net::mdns::aidl::IMDnsEventListener>& listener) 76 EXCLUDES(mMutex); 77 const EventListenerSet& getEventListenersImpl() const REQUIRES(mMutex); 78 }; 79