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Separation Of Mechanism From Policy
The separation of mechanism and policy is a design principle in computer science. It states that mechanisms (those parts of a system implementation that control the authorization of operations and the allocation of resources) should not dictate (or overly restrict) the policies according to which decisions are made about which operations to authorize, and which resources to allocate. While most commonly discussed in the context of security mechanisms (authentication and authorization), separation of mechanism and policy is applicable to a range of resource allocation problems (e.g. CPU scheduling, memory allocation, quality of service) as well as the design of software abstractions. Per Brinch Hansen introduced the concept of separation of policy and mechanism in operating systems in the RC 4000 multiprogramming system. Artsy and Livny, in a 1987 paper, discussed an approach for an operating system design having an "extreme separation of mechanism and policy". In a 2000 article, C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Butler W
A butler is a person who works in a house serving and is a domestic worker in a large household. In great houses, the household is sometimes divided into departments, with the butler in charge of the dining room, wine cellar, and pantries, pantry. Some also have charge of the entire parlour floor and Housekeeper (domestic worker), housekeepers caring for the entire house and its appearance. A butler is usually male and in charge of male servants, while a housekeeper is usually female and in charge of female servants. Traditionally, male servants (such as Footman, footmen) were better-paid and of higher status than female servants. The butler, as the senior male servant, has the highest servant status. He can also sometimes function as a chauffeur. In older houses where the butler is the most senior worker, titles such as ''majordomo'', ''butler administrator'', ''house manager'', ''manservant'', ''staff manager'', ''chief of staff'', ''staff captain'', ''estate manager'', and '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
