In this case, however, you have already modeled the IOrderManagement and callback service specifications, so you can delete the two that are created by the pattern.
然而，在这种情况下，您已经对IOrderManagement和回调服务规范建模了，因此您可以删除模式所创建的这两个内容。
So, let's create a trait that implements this pattern, then use it to handle callback behavior.
所以，让我们创建一个trait来实现这个模式，然后用它来处理回调行为。
When looking at the callback pattern from a Scala perspective what we actually see is a cumbersome implementation of a 'function'.
如果从Scala的视角来看待这种回调模式，我们发现里面充斥的全都是某个“函数”的繁琐实现。
It is the Observer pattern on top of the base web services infrastructure that gives DEBA its callback capability.
在基本Web服务结构之上采用观察者模式，就为DEBA带来了回调能力。
Hence, by implementing the observer callback pattern using web services, we provide a new mechanism for an asynchronous architecture over a synchronous infrastructure.
因此，如果使用Web服务来实现这种观察者回调方法，我们就可以在同步的基础结构中获得异步的体系。
Hence, by implementing the observer callback pattern using web services, we provide a new mechanism for an asynchronous architecture over a synchronous infrastructure.
因此，如果使用Web服务来实现这种观察者回调方法，我们就可以在同步的基础结构中获得异步的体系。
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