Concepts & Notations

Acknowledgements  The material in this tutorial is based in part on: The Unified Modeling Language Reference Manual, 2 nd edition, by James Rumbaugh, Ivar Jacobson, and Grady Booch

 Interaction View  Interaction Diagram  Sequence Diagram  Examples

Interaction View  Objects interact to implement behavior  Two ways to describe interaction focus on individual objects (state machine) focus on interactions of a collection of cooperating objects (interaction view)  Provides a more holistic view of the behavior of a set of objects

Interaction Diagram  Collaboration Diagram Emphasizes structural relations between objects  Sequence Diagram Illustrates how objects interacts with each other Emphasizes time ordering of messages

Sequence Diagram member: LibraryMember book:Book :Book Copy borrow(book) ok = mayBorrow() [ok] borrow(member) setTaken(member)

Sequence Diagram member: LibraryMember book:Book :Book Copy borrow(book) ok = mayBorrow() [ok] borrow(member) setTaken(member) X-Axis (roles) Y-Axis (time)

Sequence Diagram member: LibraryMember book:Book :Book Copy borrow(book) ok = mayBorrow() [ok] borrow(member) setTaken(member) X-Axis (roles) Y-Axis (time) head symbol life line

Sequence Diagram member: LibraryMember book:Book :Book Copy borrow(book) ok = mayBorrow() [ok] borrow(member) setTaken(member) X-Axis (roles) Y-Axis (time) head symbol life line activation double line

Object  Naming syntax [instance Name]:[class Name]  Life line represents the object’s life during the interaction bDay:Date

Object  Active Object holds the root of a stack executions has its own thread of control  Passive Object objects that are called by an active object receive control only when called

Object pull : Queueactor1 : …actor2 : … active object passive object

Message  An interaction between two objects operation call signaling RPC  An arrow between the life lines of two objects  Labeled with name arguments control information

Message pull : Queueactor1 : …actor2 : … message

Synchronous Message  The routine that handles the message is completed before the caller resumes execution :A:B doYouUnderstand() Caller Blocked return (optional) yes synchronous message

Creation Message  An object may create another object via a create() message old:A create() :B Preferred create message

Destruction Message  An object may destroy another object via a destroy() message old:Anew:B destroy()

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Examples print(doc,client) Client :PrintServer:Queue :Printer Proxy enqueue(job) status job=dequeue() [job]print(job.doc) [job] done(status) Repeated forever with 1 min interludes

Review  Time on y-axis, roles on x-axis  Activation bars represent executions of procedures  Active objects have bars  Solid arrowheads: synchronous  Stick arrowheads: asynchronous  Dashed message lines: return :PrintServer