唯一要告诫的是我们的目标类本身恰恰就是拦截过滤器。
The only caveat is that our target class happened to be intercepting filter itself.
每当我们调用一个目标对象（流程）时，拦截过滤器将一个接一个的被代理机制所调用。
The Intercepting filters will be invoked one after another by the proxy mechanism, every time we invoke target object(process).
源和目标列中都提供了一个过滤器，可以使字段的查找变得非常容易。
A filter is provided on both the source and target columns to make finding such fields easier.
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