Some other Styles of Architecture
1. Repositories
There are two types of components in a repository. A central data store and a collection of interconnected components that operate on it to store retrieve and update information. Fig 5.27, illustrates a typical black board ( repository) . usually a black board consists of three aspects. The blackboard itself, knowledge sources and the control.
An advantage of this type of architecture is its openness, the data representation is often made available to several vendors so that can build tools to access the repository. But this characteristic is a disadvantage too.
2. Interpreters
An interpreter takes a string of characters called pseudo code, and transforms in not actual code that is then executed. Thus interpreter is a machine to interpret the pseudo code into the executable form.
3. Process Control
Shaw and Garlan has shown that process control systems are very different from function or object based design which are characterized by the kinds of components that appear in the design.
Process control system are characterized by the types of components and their interrelationships. The purpose of a process control system is to maintain specific properties of process outputs or near specified reference values called set points. For an example the home heating and cooling system uses a thermostat to monitor air temperature and then controls the furnace and air conditioner to keep the air temperature within an acceptable range. The most common software based control system includes a closed loop one of two forms, feedback and feed forward as shown in fig 5.28.
A feedback system measures a controlled variable like temperature and adjusts the process accordingly to keep the controlled variable near or at the set point. In feed forward, the system tries to anticipate future effects on the controlled variable by measuring other process variables that may be good indicators. A feed forward system is more appropriate than a feedback one.
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