workmanager侦听器立即调用 [英] workmanager listener called immediately

问题描述

完成工作后，我需要从WorkManager(android.arch.work:work-runtime-ktx:1.0.0-alpha11)进行回调.但是，我要添加的侦听器会在安排工作后立即被调用.

I need to have a callback upon Work completion from WorkManager (android.arch.work:work-runtime-ktx:1.0.0-alpha11). Yet the listener I'm adding is called immediately after work is scheduled.

这就是我要做的:

val work = OneTimeWorkRequestBuilder<UploadWorker>()
                .setConstraints(constraints)
                .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 1, TimeUnit.MINUTES)
                .setInputData(inputData)
                .build()
workManager.beginUniqueWork(INSURANCE_UPLOAD_WORKER, ExistingWorkPolicy.REPLACE, work)
                .enqueue().result.toWorkResult()

UploadWorker类仅在完成整个上传序列后才返回成功.

The UploadWorker class returns Success only after completing the whole upload sequence.

这是扩展功能代码:

private val executor = Executor { command -> command?.run() }

class WorkResult(private val future: ListenableFuture<*>) {

    fun addListener(listener: () -> Unit) {
        future.addListener(Runnable {
            debugLog("work result listener runnable called")
            listener()
        }, executor)
    }

}

internal fun ListenableFuture<*>.toWorkResult(): WorkResult {
    return WorkResult(this)
}

当我将侦听器添加到WorkResult时，将立即调用所有侦听器，而无需等待实际工作完成.有什么想法吗?

When I add listeners to WorkResult, they are all called immediately, without waiting for the actual work to complete. Any thought on this?

推荐答案

直到为此找到合适的解决方案(无GC错误等)，最基本的方法是创建另一个WorkRequest并将其链接为最后的工作请求处理状态.

Until a proper solution is found for this (w/o GCed errors etc), a rudimentary approach could be to create another WorkRequest and chain it as the last work request to handle the state.

当然，您将必须分别处理错误状态(并始终为每个WorkRequest返回Result.success)，以允许通过链传播.

Ofcourse, you would have to handle the error states separately (And always return Result.success for each WorkRequest) to allow propagation through the chain.

这绝不是可持续的方法，而是必要时的快速解决方案

This is by no means a sustainable approach, but rather a quick fix if necessary

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