An initial scan of the input directory when the flow is started populates a list of input files that match the input pattern and are waiting to be processed by the message flow.
流启动时的初始输入目录扫描将填充与输入模式匹配并等待由消息流处理的输入文件列表。
When all files from the list have been processed, the flow returns to the input directory to seek new files which have arrived since the previous scan.
当列表中的所有文件都已完成处理时，流将返回输入目录去查找自从上次扫描以来已到达的新文件。
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