In a construct similar to filter chaining, it takes a list of MessageHandler objects in the constructor.

在类似于过滤器链的结构中，构造函数中包含一系列的Message Handler对象。

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Instead of chaining functions that contain filters, we could wrap a filter visitor around conditions composed using normal Clojure connectors.

我们不必将包含筛选器的函数链接在一起，只需在使用普通Clojure连接器建立的条件中包装一个筛选器访问者即可。

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