Sunny Goyal
cc1dad0cae
Bug: 318539160 Flag: None Test: Manual Change-Id: Ie855427c2676e0ce76655e4dd67472c0b5e435d8
71 lines
2.1 KiB
Kotlin
71 lines
2.1 KiB
Kotlin
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.util
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import java.util.concurrent.Executor
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import java.util.function.Consumer
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import java.util.function.Supplier
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/** A [Runnable] that can be posted to a [Executor] that can be cancelled. */
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class CancellableTask<T>
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@JvmOverloads
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constructor(
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private val task: Supplier<T>,
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// Executor where consumer needs to be executed on. Typically UI executor.
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private val callbackExecutor: Executor,
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// Consumer that needs to be accepted upon completion of the task. Typically work that needs to
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// be done in UI thread after task completes.
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private val callback: Consumer<T>,
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// Callback to be executed on callbackExecutor at the end irrespective of the task being
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// completed or cancelled
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private val endRunnable: Runnable = Runnable {}
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) : Runnable {
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// flag to cancel the callback
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var canceled = false
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private set
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private var ended = false
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override fun run() {
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if (canceled) return
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val value = task.get()
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callbackExecutor.execute {
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if (!canceled) {
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callback.accept(value)
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}
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onEnd()
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}
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}
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/**
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* Cancel the [CancellableTask] if not scheduled. If [CancellableTask] has started execution at
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* this time, we will try to cancel the callback if not executed yet.
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*/
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fun cancel() {
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canceled = true
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callbackExecutor.execute(this::onEnd)
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}
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private fun onEnd() {
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if (!ended) {
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ended = true
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endRunnable.run()
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}
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}
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}
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