![]() State invariants and constraints: In an interaction diagram, a state is a situation or condition during a lifetime of an object-it satisfies a constraint, performs various operations, and waits for an event. In UML, iteration is achieved by using a loop operator. Parallel iteration specifiers are used to show that messages are being sent in parallel. An iteration expression can also be used to show iteration expression in an interaction diagram. Iteration: An interaction expression consists of an interaction specifier and an iteration clause. A message can have multiple guard conditions, and multiple messages can carry the same guard conditions. Only if a message’s guard conditions are true can it be sent forward. These guard conditions are used to verify if a message can be sent forward or not. To represent branching within an interaction diagram, guard conditions are added to individual messages. Par (parallel): All operands are executed in parallel with one another.īranching: These are some of the most crucial terms in an interaction diagram.Ref (reference): This operator refers to another interaction.Break (break): If the condition is true or false, the loop is broken, and the next instruction is executed.Loop (loop): This operator loops an instruction for a specific time period.Alt (alternative): An operand, whose condition is true, is executed.Opt (option): An operand is executed if the condition is true.The various operators within an interaction diagram are as follows: In UML, an operator supports operations on data in the form of branching and iterations. ![]() Operator: An operator specifies how the operands will be executed within an operation.
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