mirror of
https://github.com/meshtastic/Meshtastic-Android.git
synced 2026-04-20 22:23:37 +00:00
51 lines
1.7 KiB
Kotlin
51 lines
1.7 KiB
Kotlin
/*
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* Copyright (c) 2025 Meshtastic LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.geeksville.mesh.concurrent
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Job
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import java.util.concurrent.atomic.AtomicReference
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import javax.inject.Inject
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/**
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* A helper class that manages a single [Job].
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*
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* When a new job is launched, the previous one is cancelled. This is useful for ensuring that only one operation of a
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* certain type is running at a time.
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*/
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class SequentialJob @Inject constructor() {
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private val job = AtomicReference<Job?>(null)
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/**
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* Cancels the previous job (if any) and launches a new one in the given [scope].
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*
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* The new job uses [handledLaunch] to ensure exceptions are reported.
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*/
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fun launch(scope: CoroutineScope, block: suspend CoroutineScope.() -> Unit) {
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cancel()
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val newJob = scope.handledLaunch(block = block)
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job.set(newJob)
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newJob.invokeOnCompletion { job.compareAndSet(newJob, null) }
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}
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/** Cancels the current job. */
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fun cancel() {
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job.getAndSet(null)?.cancel()
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}
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}
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