The ESB provides a distributed infrastructure while maintaining centralization of control, requiring some form of service routing directory and perhaps a business service directory as well.
ESB在维持集中控制的同时提供分布式的基础架构，因而需要一些形式的服务路由目录，并且还可能需要业务服务目录。
However, this centralization is risky for several reasons, not least of which is giving a third party total control over your access to services, and possibly your private data.
然而，由于种种原因这种集中非常危险，不仅是因为会使第三方完全控制您对服务的访问，并且可能控制您的私人数据。
The centralization of workflow logic into the abstract superclass is an example of inversion of control.
使工作流的逻辑集中到抽象类是控制反转的例子。
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