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Software System Engineering. Dr. M.E. Fayad, Professor Computer Engineering Department, Room #283I College of Engineering San José State University One Washington Square San José, CA 95192-0180 http://www.engr.sjsu.edu/~fayad. Lesson 3-6c: Interaction Diagrams. 2. Lesson Objectives. - PowerPoint PPT Presentation
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© M.E. Fayad 2000-2006 SJSU -- CmpE
Software System Engineering
Dr. M.E. Fayad, Professor
Computer Engineering Department, Room #283I
College of Engineering
San José State University
One Washington Square
San José, CA 95192-0180
http://www.engr.sjsu.edu/~fayad
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S2 Interaction Diagrams
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Lesson 3-6c:Interaction Diagrams
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S3 Interaction Diagrams
Lesson Objectives
Objectives
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Understand how to create interaction diagrams Learn the syntax of interaction diagrams Explore interaction diagrams’ examples
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S4 Interaction Diagrams
An interaction diagram shows an interaction,
consisting of a set of objects and their
relationships, including the messages that
may be dispatched among them
– Sequence diagram
– Collaboration diagram
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Interaction Diagrams (1)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S5 Interaction Diagrams
A sequence diagram emphasizes the time
ordering of messages
A collaboration diagram emphasizes the
structural organization of the objects that
send and receive messages
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Interaction Diagrams (2)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S6 Interaction Diagrams
To visualize, specify, construct, and
document the dynamics of a particular
society of objects
To model one particular flow of control
of a use case
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Uses of Interaction Diagrams
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S7 Interaction Diagrams
ObjectsLinksMessagesNotesConstraints
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Contents of Interaction Diagrams
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S8 Interaction Diagrams
Place objects that participate in the
interaction as the vertices in a graph
Render the links that connect these
objects as the arcs of this graph
Adorn these links with the messages
that objects send and receive 8
Drawing Collaboration Diagrams
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S9 Interaction Diagrams
Use sequence diagrams to model flows of control by time ordering
– Do a better job of visualizing simple iteration and branching
Use collaboration diagrams to model flows of control by organization
– Do a better job of visualizing complex iteration and branching and of visualizing multiple concurrent flows of control 9
Common Uses
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S10 Interaction Diagrams
A collaboration diagram displays
object interactions organized
around objects and their links to
one another
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Interaction Diagrams (1)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S11 Interaction Diagrams
Don’t show the lifeline of an object explicitly
– Although one can show both create and
destroy messages
Don’t show the focus of control explicitly
– Although each message’s sequence
number can indicate nesting
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Interaction Diagrams (2)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S12 Interaction Diagrams
Two features that distinguish them
from sequence diagrams
– Path
• To indicate how one object is linked to another
– Sequence number
• To indicate the time order of a message
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Interaction Diagrams (3)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S13 Interaction Diagrams
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Interaction Diagram: Example (1)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S14 Interaction Diagrams
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Interaction Diagram: Example (2)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S15 Interaction Diagrams
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Interaction Diagram: Example (3)
© M.E. Fayad 2000-2006 SJSU – CmpE M.E. Fayad L3-6c-S16 Interaction Diagrams
T/F
a. Use collaboration diagrams to model flows of control by organization
b. A collaboration diagram displays object interactions organized around objects and their links to one another
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Discussion Questions
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