如何每5秒运行一次WorkManager的工作重试

Question

如何每5秒重试一次？如果成功，则取消它吗？

使用下面的解决方案，每10秒运行一次+时间线性增长。

// todo: schedule, and invoke worker every 5 seconds
// todo: if the work is done and there is no more work in queue - cancel worker.

fun scheduleBatchUpload(uniqueWorkName: String) {
    val logBuilder = PeriodicWorkRequest.Builder(StreamLogWorker::class.java, 5, TimeUnit.SECONDS)

    logBuilder.setBackoffCriteria(BackoffPolicy.LINEAR, 5000, TimeUnit.MILLISECONDS) // Custom retry not working

    WorkManager.getInstance().enqueueUniquePeriodicWork(uniqueWorkName, ExistingPeriodicWorkPolicy.REPLACE, logBuilder.build())
}


class StreamLogWorker(context: Context, workerParams: WorkerParameters) : Worker(context, workerParams) {

    override fun doWork(): Result {
        Log.e("!!!!!!!!!!", "doWork")
        return Result.retry()
    }
}

Answer 1

您可以尝试手动安排任务，也许可以帮助您实现目标。

private fun WorkManager.launchFrequentTask() {
    val request = OneTimeWorkRequestBuilder<StreamLogWorker>()
            .setInitialDelay(5, TimeUnit.SECONDS)
            .build()
    enqueueUniqueWork(UNIQUE_WORK_NAME, ExistingWorkPolicy.APPEND, request)
}

class StreamLogWorker(private val context: Context, workerParams: WorkerParameters) : Worker(context, workerParams) {

    override fun doWork(): Result {
        try {
            // TODO doWork
        } catch (th: Throwable) {
            // log error
        }
        WorkManager.getInstance(context).launchFrequentTask()
        return Result.success()
    }
}

不确定这是否真的如您所愿（每5秒钟），有必要进行检查。