Sequence Diagram

Introduction Dynamic View State chart Diagram Collaboration Diagram Sequence Diagram آزمايشگاه سيستم هاي همشمند

Sequence & Collaboration Diagram describe the flow of messages between objects. Sequence Diagram: focus on the order in which the messages are sent Collaboration Diagram: emphasizes the relationships between the objects

Sequence Diagram showing concurrent multi-threaded interactions. finding race conditions in concurrent systems

Notation Objects or Acotors Lifelines Activations box (method-invocation boxes) Messages

Notation [sequence number] <<Create>> ,<<Destroy>> , C++ , C# & java garbage collection Return value Dashed line message with a label Method name : return value Loop Send message to itself

Type of Message Asynchronous:  the sender doesn’t wait for the result of the message  hardware devices, autonomous software services Synchronous: sender waits for the result before continuing on

Another Notation

Example (condition UML 1.x) Condition to one message

Example (condition UML 2) group of messages

Combined Fragment (UML 2) Alternative (alt) : model if, else Option (opt) Loop (loop) : [minint=no, maxint=no]

Example