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The observer pattern is a software design pattern in which an object, named the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, u…

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Any content management system must have a robust "auth" component. "Auth" stands for authentication and authorization. Authentication is an well talked topic. Authorization is the interest of this po…

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This is a question I posted on stackoverflow. We are creating an android application which requires multiple ways to secure authentications. Current solution: username/password …

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I was reading coolshell.cn tonight. The author refers to the chapter of modularity in the book The Art of Unix Programming as the most charming chapter. Thus, I searched and read it. When I read the …

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