Generating UML Sequence Charts

= UML Sequence Charts for Traces

ProB has a new experimental feature to generate a UML sequence chart from the current animation trace. It currently only works for classical B models and you need to copy the plantUML.jar file to ProB's lib folder.

Specifying the Actors

For every B Operation Op that you want to visualise you need to add a definition

SEQUENCE_CHART_Op

in your DEFINITIONS. The definition can take arguments, in which case the actual arguments in the trace are passed to the definition. The definition can take fewer arguments (but not more) than the B operation.

The definition should either return

• a couple (ActorFrom,ActorTo) specifying the name of the actor sending the message (ActorFrom) and the one receiving the message (ActorTo). You can use strings or other values (which will be converted to strings).
• a triple (ActorFrom,ArrowStyle,ActorTo), where the actors are like above and ArrowStyle is a string representing a valid plantUML arrow.
• a triple (ActorFrom,ArrowStyle,ArrowSuffix,ActorTo), where the actors and arrow style are like above and ArrowSuffix is a string representing a valid plantUML arrow suffix.

Currently these arrow styles are supported:

• -->
• ->
• ->x
• ->>

etc

Optionally you can add these suffixes:

• ++ (activate the target)
• -- (deactivate source)
• ** (create an instance of target)
• !! (destroy an instance of target)

Example

MACHINE scheduler_UML
SETS
	PID  = {process1,process2,process3}
VARIABLES active, ready, waiting
DEFINITIONS
      "CHOOSE.def";
      SEQUENCE_CHART_INITIALISATION == ""; // ignore
      SEQUENCE_CHART_new(pp) == ("Master", "-->","**",pp);
      SEQUENCE_CHART_del(pp) == ("Master", "-->","!!",pp);
      SEQUENCE_CHART_ready(pp) == (pp, "-->","Master");
      SEQUENCE_CHART_swap == ("Master", "-->","--",CHOOSE(active))
INVARIANT
           active <: PID &
           ready <: PID   &
           waiting <: PID &
           (ready /\ waiting) = {} &
           active /\ (ready \/ waiting) = {} &
           /*@label "SAF" */ card(active) <= 1 &
           ((active = {})  => (ready = {}))
INITIALISATION
	active := {} || ready := {} || waiting := {}
OPERATIONS
new(pp) =
	SELECT
		pp : PID  &
		pp /: active &
		pp /: (ready \/ waiting)
	THEN
		waiting := (waiting \/ { pp })
	END;
del(pp) =
	SELECT
		pp : waiting
	THEN
		waiting := waiting - {pp}
	END;
ready(rr) =
        SELECT
                rr : waiting
        THEN
                waiting := (waiting - {rr}) ||
                IF (active = {}) THEN
                   active := {rr}
                ELSE
                   ready := ready \/ {rr}
                END
        END;
swap =
        SELECT
                active /= {}
        THEN
                waiting := (waiting \/ active) ||
                IF (ready = {}) THEN
                   active := {}
                ELSE
                   ANY pp WHERE pp : ready
                   THEN
                       active := {pp} ||
                       ready := ready - {pp}
                   END
                END
        END
END