In essence, if the message is fired on the first output terminal of the custom mediation primitive, it is not logged, whereas if it is fired on the second terminal, it is logged to a database.
本质上，如果消息在自定义中介原语的第一个输出端子上激发，则不对其进行记录，而如果在第二个端子上激发，则会将其记录到数据库。
Assume the following three input messages are sent to the in terminal of the FileOutput node, followed by a final message sent to the Finish File terminal of the same node.
假设将以下三条消息发送到FileOut put节点的in终端，随后将最后一条消息发送到同一个节点的Finish File终端。
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