Material and some slide content from: - Software ...

Lecture 8 - Thursday, October 7 2010.

Material and some slide content from:- Software Architecture: Foundations, Theory, and Practice- Atif Kahn [GWT Content]

Architectures and NFPsReid Holmes

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REID HOLMES - SE2: SOFTWARE DESIGN & ARCHITECTURE

iRoadTrip: statechart


iRoadTrip: New trip


iRoadTrip: Location update


Activity‣ Describe one of your designs to another team.

‣ Clearly explain your rationale for the design you have chosen to present.

‣ Note any details that are ambiguous.


NFPs‣ NFPs are constraints on the manner in which the

system implements and delivers its functionality.

‣ E.g.,

‣ Efficiency

‣ Complexity

‣ Scalability

‣ Heterogeneity

‣ Adaptability

‣ Security

‣ Dependability

[TAILOR ET AL.]


FP vs NFP‣ Products are sold based on their FPs.

‣ e.g., Cell phone, Car, Tent.

‣ However, NFPs play a critical role in perception.

‣ “This program keeps crashing”

‣ “It doesn’t work with my [...]”

‣ “It’s too slow”

[TAILOR ET AL.]


Design guidelines for NFPs‣ Provide guidelines that support various NFPs.

‣ Focus on architectural level:

‣ Components

‣ Connectors

‣ Topologies

[TAILOR ET AL.]


NFP: Efficiency‣ Efficiency is a quality that reflects a system’s

ability to meet its performance requirements.

‣ Components:‣ ?‣ Simple and compact interfaces.‣ Allow multiple interfaces to the same functionality.‣ Separate data from processing components.‣ ?

‣ Connectors:‣ Carefully select connectors.‣ Be careful of broadcast connectors.‣ ?‣ Be wary of location/distribution transparency.

‣ Topology:‣ ?‣ Consider the efficiency impact of selected styles.

[TAILOR ET AL.]


Multiple Interfaces[TAILOR ET AL.]


Distribution transparency[TAILOR ET AL.]


Topological distance[TAILOR ET AL.]


NFP: Complexity‣ Complexity is a property that is proportional to the

size of a system, its volume of constituent elements, their internal structure, and their interdependencies.

‣ Components:‣ ?‣ Isolate functionality from interaction.‣ ?‣ Insulate processing from data format changes.

‣ Connectors:‣ Isolate interaction from functionality.‣ Restrict interactions provided by each connector.

‣ Topology:‣ ?‣ Use hierarchical (de)composition.

[TAILOR ET AL.]


Connector complexity[TAILOR ET AL.]

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