Sequence Diagrams

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Sequence Diagrams

• Getting the Message

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Overview

• Sequence Diagrams are used to model the
  interactions among classes
• They are used at all stages of the development
  process
• Often they are used to show how Use cases are
  distributed assigned to various objects

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Basic Elements
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Database Update Sample
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Message types
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Message Descriptions

• Synchronous messages indicate that the flow is
  interrupted until the message is completed
• Return shows that control has returned to the
  calling object
• Asynchronous used for messages that are sent, but
  from which the active object doesnt wait for a
  reply
• Flat makes no distinctions between synchronous
  and asynchronous

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Message to Self
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Creating objects
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Adding States
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Branching
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Alternate Flows