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Each component is connected to the others through a number of exposed "ports". Communication through these ports follow a given protocol depending on their purpose. Ports and protocols define an abstract [[Application programming interface|API]] that can be implemented by any suitable technical means (e.g. [[method invocation]] in an [[Object-oriented programming|object-oriented language]], [[remote procedure call]]s, or [[Web service]]s).
The granularity of the ports and their number is not
* a single port could in some case be sufficient (e.g. in the case of a simple service consumer) ;
* typically, there are ports for event sources (user interface, automatic feeding), notifications (outgoing notifications), [[database]] (in order to interface the component with any suitable DBMS), and administration (for controlling the component);
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