Question

我正在尝试了解Kotlin上的协程，并且对此主题有一些疑问。

这些作业是通过ScheduledService中的foreach循环创建的，该循环可检索任务，并且每个任务都以此方式运行协程作业

fun executeUploadJob(transporter: Transporter, taskId: Long) {
    GlobalScope.launch {
        exportTaskRepository.findById(taskId).ifPresent { task ->
            task.status = TaskStatus.IN_PROGRESS
            exportTaskRepository.save(task)
        }
        transporter.executeSingleFilesTransportCycle()
    }.invokeOnCompletion {
        when (it) {
            null -> {
                exportTaskRepository.findById(taskId).ifPresent { task ->
                    task.status = TaskStatus.UPLOADED
                    task.lastUpdated = Timestamp(System.currentTimeMillis())
                    exportTaskRepository.save(task)
                }
            }
            //means that job was cancelled from outside and it should not be counted as error
            is CancellationException -> {
                logger.warn("Job was cancelled..[Task Id - $taskId]", it)
                exportTaskRepository.findById(taskId).ifPresent { task ->
                    task.lastUpdated = Timestamp(System.currentTimeMillis())
                    task.nextAttempt = Timestamp(System.currentTimeMillis() + THIRTY_MINUTES)
                    task.status = TaskStatus.WAITING
                    exportTaskRepository.save(task)
                }
            }
            else -> {
                logger.error("Error while uploading file [TaskId - $taskId]", it)
                exportTaskRepository.findById(taskId).ifPresent { task ->
                    task.lastUpdated = Timestamp(System.currentTimeMillis())
                    task.nextAttempt = Timestamp(System.currentTimeMillis() + THIRTY_MINUTES)
                    task.status = TaskStatus.WAITING
                    exportTaskRepository.save(task)
                }
            }
        }
    }
}

我的问题是：1）如果引发任何异常，当前协程是否会在JVM中存在，或者它将消失并且不存在内存泄漏以及对Job的引用？ 2）将作业引用保存到某个位置以定期跟踪其状态是否正确？

协程科特林

0 个答案: