Difference between types of messages in sequence diagrams.

Question

What is the difference between?

Self message Recursive message Re-entrant message

thanks

Answer 1

A Self Message is a type of message which represents the execution or operation call in the same object lifeline.

A recursive message is a type of self message that is executed recursively.

A re-entrant message is where you have an object A and and oject B.

• A makes a call C to B
• B needs some data from A to complete call C
• B sends a message to A get the data required to complete call C

The call that B makes to A is called a re-entrant message.

Hope that makes sense!!!