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 #define LOG_TAG "MDnsEventReporter" 18 19 #include "MDnsEventReporter.h" 20 21 using android::IInterface; 22 using android::sp; 23 using android::net::mdns::aidl::IMDnsEventListener; 24 getInstance()25MDnsEventReporter& MDnsEventReporter::getInstance() { 26 // It should be initialized only once. 27 static MDnsEventReporter instance; 28 return instance; 29 } 30 getEventListeners() const31const MDnsEventReporter::EventListenerSet& MDnsEventReporter::getEventListeners() const { 32 return getEventListenersImpl(); 33 } 34 addEventListener(const sp<IMDnsEventListener> & listener)35int MDnsEventReporter::addEventListener(const sp<IMDnsEventListener>& listener) { 36 return addEventListenerImpl(listener); 37 } 38 removeEventListener(const sp<IMDnsEventListener> & listener)39int MDnsEventReporter::removeEventListener(const sp<IMDnsEventListener>& listener) { 40 return removeEventListenerImpl(listener); 41 } 42 getEventListenersImpl() const43const MDnsEventReporter::EventListenerSet& MDnsEventReporter::getEventListenersImpl() const { 44 std::lock_guard lock(mMutex); 45 return mEventListeners; 46 } 47 addEventListenerImpl(const sp<IMDnsEventListener> & listener)48int MDnsEventReporter::addEventListenerImpl(const sp<IMDnsEventListener>& listener) { 49 if (listener == nullptr) { 50 ALOGE("The event listener should not be null"); 51 return -EINVAL; 52 } 53 54 std::lock_guard lock(mMutex); 55 56 for (const auto& it : mEventListeners) { 57 if (IInterface::asBinder(it->getListener()).get() == IInterface::asBinder(listener).get()) { 58 ALOGW("The event listener was already subscribed"); 59 return -EEXIST; 60 } 61 } 62 63 auto eventListener = sp<EventListener>::make(this, listener); 64 IInterface::asBinder(listener)->linkToDeath(eventListener); 65 mEventListeners.insert(eventListener); 66 return 0; 67 } 68 removeEventListenerImpl(const sp<IMDnsEventListener> & listener)69int MDnsEventReporter::removeEventListenerImpl(const sp<IMDnsEventListener>& listener) { 70 if (listener == nullptr) { 71 ALOGE("The event listener should not be null"); 72 return -EINVAL; 73 } 74 75 std::lock_guard lock(mMutex); 76 77 for (const auto& it : mEventListeners) { 78 const auto& binder = IInterface::asBinder(it->getListener()); 79 if (binder == IInterface::asBinder(listener)) { 80 binder->unlinkToDeath(it); 81 mEventListeners.erase(it); 82 return 0; 83 } 84 } 85 ALOGE("The event listener does not exist"); 86 return -ENOENT; 87 }