Architecture Modeling - SPES 2020
Architecture Modeling - SPES 2020
Architecture Modeling - SPES 2020
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Constrrain<br />
Eventts<br />
with Co onditions<br />
In additioon<br />
to filteringg<br />
events with h intervals it iis<br />
also possible<br />
to constr rain events thhrough<br />
a con ndition by<br />
the followwing<br />
expresssion:<br />
Event undder<br />
(Condi ition)<br />
<strong>Architecture</strong> <strong>Modeling</strong><br />
To illustrrate<br />
the usagge,<br />
the exam mple above neeeds<br />
only slight<br />
changes s:<br />
Requirement:<br />
The syste em shall reacct<br />
on reques sts with a res sponse if thee<br />
status of the<br />
system<br />
is active.<br />
Now the evvents<br />
got rep placed by a conditional expression. The correspponding<br />
patte ern looks<br />
like this:<br />
whenever request under u (staatus<br />
== ac ctive) occ curs respoonse<br />
occurs.<br />
The patternn<br />
above typic cally needs a refinement, , since the sp pecification oof<br />
the respon nse event<br />
lacks an intterval<br />
when it<br />
should occur.<br />
In the coorrespondingg<br />
observers the t guard off<br />
the transitio on that is enabled<br />
with cconstrained<br />
event e has<br />
to be exttended<br />
with tthe<br />
constrain ning conditionn:<br />
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