13.3.12 DurationObservation

   Generalizations

   • Observation (from SimpleTime ) on page 463

   Description

   An observation is a reference to a duration during an execution. It points out the element(s) in the model to observe and whether the observations are when this model element is entered or when it is exited.

   Attributes

   • firstEvent:Boolean[0..2] The value of firstEvent[i] is related to event[i] (where i is 1 or 2). If firstEvent[i] is true, then the corresponding observation event is the first time instant the execution enters event[i]. If firstEvent[i] is false, then the corresponding observation event is the time instant the execution exits event[i]. Default value is true applied when event[i] refers an element that represents only one time instant.

   Associations

   • event:NamedElement [1..2] The observation is determined by the entering or exiting of the event element during execution.

   Constraints

   [1] The multiplicity of firstEvent must be 2 if the multiplicity of event is 2. Otherwise, the multiplicity of firstEvent is 0.

   if (event->size() = 2) then (firstEvent->size() = 2) else (firstEvent->size() = 0)

   Semantics

   A duration observation denotes some interval of time.

   Notation

   A duration observation is often denoted by a straight line attached to a model element. The observation is given a name which is shown close to the unattached end of the line.