1 /* <lambda>null2 * Copyright (C) 2024 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.settings.fuelgauge.utils 18 19 import androidx.lifecycle.DefaultLifecycleObserver 20 import androidx.lifecycle.Lifecycle 21 import androidx.lifecycle.LifecycleOwner 22 import java.util.concurrent.ExecutorService 23 import java.util.concurrent.Executors 24 25 /** 26 * The factory class to create executors which could bind with an UI page lifecycle and shutdown 27 * automatically when onStop() method was invoked. 28 * 29 * NOTE: Creating an executor from an UI page MUST set the lifecycle. Only non-UI jobs can set 30 * the lifecycle to null. 31 */ 32 object LifecycleAwareExecutorFactory { 33 34 fun newSingleThreadExecutor(lifecycle: Lifecycle?): ExecutorService { 35 return Executors.newSingleThreadExecutor().also { executor -> 36 executor.autoShutdown(lifecycle) 37 } 38 } 39 40 fun newFixedThreadPool(lifecycle: Lifecycle?, nThreads: Int): ExecutorService { 41 return Executors.newFixedThreadPool(nThreads).also { executor -> 42 executor.autoShutdown(lifecycle) 43 } 44 } 45 46 fun newCachedThreadPool(lifecycle: Lifecycle?): ExecutorService { 47 return Executors.newCachedThreadPool().also { executor -> 48 executor.autoShutdown(lifecycle) 49 } 50 } 51 52 private fun ExecutorService.autoShutdown(lifecycle: Lifecycle?) { 53 if (lifecycle == null) { 54 return 55 } 56 57 val observer = object : DefaultLifecycleObserver { 58 override fun onStop(owner: LifecycleOwner) { 59 this@autoShutdown.shutdown() 60 owner.lifecycle.removeObserver(this) 61 } 62 } 63 lifecycle.addObserver(observer) 64 } 65 } 66