You can replace this with a notification appropriate for your application.
您可以使用您的应用程序中合适的通知来代替它。
The sample application detailed in this article simulates the publication of notification messages for the arrival of a flight at an airport.
本文所详细介绍的这个示例应用程序模仿了机场上有航班抵达时的通知消息发布。
Event notification - the various steps of the flow can perform notifications via callbacks, allowing for the host application to report and respond to the progress of the data processing.
事件通知——流的各种步骤可以通过回调进行通知，以此告诉主机应用去报告和响应数据处理的过程。
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