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-And let's start with software components. A

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-software component is an architectural entity that encapsulates

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-a subset of the system's functionality and or

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-the system's data. So basically components typically provide

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-application specific services. In addition to that, a

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-software component also restricts access to that subset

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-via an explicitly defined interface. And, in addition,

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-which I'm not showing here, a component

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-can also have explicitly defined dependencies

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-on its required execution environment. In complex

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-systems, interactions might become more important and

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-challenging than functionality. And this is why

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-connectors are very important architectural elements. A

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-software connector is an architectural building block

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-tasked with effecting and regulating interactions among

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-components. So basically, connectors typically provide application

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-independent interaction facilities. And it's worth noting here

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-that in many software systems, connectors might simply be

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-procedure calls or shared data accesses. So all constants

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-that we're familiar with. But consider that much more

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-sophisticated and complex connectors are also possible. And

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-components and connectors are composed in a specific way

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-in a given system architecture to accomplish that system's

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-objective And this is expressed through an architectural configuration.

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-More precisely, an architectural configuration, or topology, is a

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-set of specific associations between the components and connectors

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-of a software system's architecture. So now, let's look

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-at an example that brings all of this together.