1 /* 2 * Copyright (C) 2023 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 package com.android.internal.app; 17 18 import android.app.prediction.AppPredictor; 19 import android.app.prediction.AppTarget; 20 21 import java.util.List; 22 import java.util.Objects; 23 import java.util.function.Consumer; 24 25 /** 26 * Callback wrapper that works around potential memory leaks in app predictor. 27 * 28 * Nulls the callback itself when destroyed, so at worst you'll leak just this object. 29 */ 30 public class ResolverAppPredictorCallback { 31 private volatile Consumer<List<AppTarget>> mCallback; 32 ResolverAppPredictorCallback(Consumer<List<AppTarget>> callback)33 public ResolverAppPredictorCallback(Consumer<List<AppTarget>> callback) { 34 mCallback = callback; 35 } 36 notifyCallback(List<AppTarget> list)37 private void notifyCallback(List<AppTarget> list) { 38 Consumer<List<AppTarget>> callback = mCallback; 39 if (callback != null) { 40 callback.accept(Objects.requireNonNullElseGet(list, List::of)); 41 } 42 } 43 asConsumer()44 public Consumer<List<AppTarget>> asConsumer() { 45 return this::notifyCallback; 46 } 47 asCallback()48 public AppPredictor.Callback asCallback() { 49 return this::notifyCallback; 50 } 51 destroy()52 public void destroy() { 53 mCallback = null; 54 } 55 } 56