A passive data source can be made to have an activeinterface by an agent that polls it periodically and actively sends information about changes in successive polls.
休眠的数据源也可以有个活跃的接口,方法是让代理定期轮询它,并在接下来的轮询中传输更改的信息。
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Situations always arise where an interface is unavailable because it needs a patch to resolve an issue, or developers must schedule downtime to work with an interface within an active testing window.