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 17 package com.android.intentresolver.shortcuts 18 19 import android.app.prediction.AppPredictor 20 import android.app.prediction.AppTarget 21 import android.content.Context 22 import androidx.lifecycle.LifecycleOwner 23 import androidx.lifecycle.coroutineScope 24 import java.util.function.Consumer 25 import kotlinx.coroutines.CoroutineScope 26 import kotlinx.coroutines.awaitCancellation 27 import kotlinx.coroutines.launch 28 29 /** 30 * A memory leak workaround for b/290971946. Drops the references to the actual [callback] when the 31 * [scope] is cancelled allowing it to be garbage-collected (and only leaking this instance). 32 */ 33 class ScopedAppTargetListCallback( 34 scope: CoroutineScope?, 35 callback: (List<AppTarget>) -> Unit, 36 ) { 37 38 @Volatile private var callbackRef: ((List<AppTarget>) -> Unit)? = callback 39 40 constructor( 41 context: Context, 42 callback: (List<AppTarget>) -> Unit, 43 ) : this((context as? LifecycleOwner)?.lifecycle?.coroutineScope, callback) 44 45 init { <lambda>null46 scope?.launch { awaitCancellation() }?.invokeOnCompletion { callbackRef = null } 47 } 48 notifyCallbacknull49 private fun notifyCallback(result: List<AppTarget>) { 50 callbackRef?.invoke(result) 51 } 52 toConsumernull53 fun toConsumer(): Consumer<MutableList<AppTarget>?> = 54 Consumer<MutableList<AppTarget>?> { notifyCallback(it ?: emptyList()) } 55 toAppPredictorCallbacknull56 fun toAppPredictorCallback(): AppPredictor.Callback = 57 AppPredictor.Callback { notifyCallback(it) } 58 } 59