5.9 Taking it too far 走得太远

Information hiding only makes sense when the information being hidden is not needed outside its module. If the information is needed outside the module, then you must not hide it. Suppose that the performance of a module is affected by certain configuration parameters, and that different uses of the module will require different settings of the parameters. In this case it is important that the parameters are exposed in the interface of the module, so that they can be turned appropriately. As a software designer, your goal should be to minimize the amount of information needed outside a module; for example, if a module can automatically adjust its configuration, that is better than exposing configuration parameters. But, it’s important to recognize which information is needed outside a module and make sure it is exposed.

仅当在其模块外部不需要隐藏信息时，隐藏信息才有意义。如果模块外部需要该信息，则不得隐藏它。假设模块的性能受某些配置参数的影响，并且模块的不同用途将需要对参数进行不同的设置。在这种情况下，将参数暴露在模块的界面中很重要，以便可以对其进行适当的旋转。作为软件设计师，您的目标应该是最大程度地减少模块外部所需的信息量。例如，如果模块可以自动调整其配置，那将比公开配置参数更好。但是，重要的是要识别模块外部需要哪些信息，并确保将其公开。