PlantUML: global variables

‘global’ keyword is used to define and access global variables.

Example

!global $counter = 1
!global $counter = $counter + 1

 

globalVariables.txt

@startuml

!global $counter = 1

!function $sum($a, $b)
	!global $counter = $counter + 1
	!return $a + $b
!endfunction

!function $sub($a, $b)
	!global $counter = $counter + 1
	!return $a - $b
!endfunction


!$a = 20
!$b = 5

sys1 -> sys2 : $counter. Sum of $a and $b is $sum(20, 5)
sys1 -> sys2 : $counter. Sub of $a and $b is $sub(20, 5)

!$a = 25
!$b = 15

sys1 -> sys2 : $counter. Sum of $a and $b is $sum(20, 5)
sys1 -> sys2 : $counter. Sub of $a and $b is $sub(20, 5)

@enduml

 

Above snippet generate below diagram.

 

 

 

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