从Portlet编程的角度来看，Portlet可以按照Portlet规范(PLT . 18.1)中指定的方式配置缓存。
From the portlet programming point of view, portlets can configure caching as specified by the portlet Specification (PLT.18.1).
根据应用程序的需求配置这个文件是一种快速扩展缓存的简便方式。
Tailoring the file to your application's needs is a convenient way to scale your cache quickly.
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