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John D. McGregor |
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Clemson University |
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These are the requirements that determine the
“shape” of the architecture |
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“the software receives a notification whenever a
particular action occurs and acts on that notification” |
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“the software takes a file name as parameter. It
reads a formatting line as the first line in the file. It then reads data
values and computes a requested statistical measure” |
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“the tool must be able to present data that has
been written in an indeterminate number of different format. The number of
formats will expand overtime” |
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Hard real-time – must clear a register before it
is overwritten |
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Soft real-time – must echo input to the screen |
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Human time – respond to query before user gets
angry |
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In this technique design moves are determined by
how well they enhance specific attributes |
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Identify module to decompose |
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Refine the module |
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a. identify drivers |
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b. choose an architectural pattern |
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c. identify modules |
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d. define module interfaces |
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e. verify modules by checking against use
cases |
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3. Repeat steps |
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A component provides services thru standardized
functional interfaces but provides non-standard control of the quality of
service such as throughput, jitter, security: |
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Application should be able to monitor and
control the qualities that are important to it |
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Long-lived applications should be able to use
multiple implementations of standard interfaces without manual interference |
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For time-critical mode transitions, resources
must be reallocated quickly |
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Solution? |
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Static application connector – acts on
application source code before it is compiled, acts like an aspect weaver
to add new source code to use the Quality connector |
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Static infrastructure connector – acts on the
middleware components – may be automatic selection of implementations |
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Dynamic connector – allocates infrastructure
resources to data flows |
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Notes