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Advanced Queuing - Oracle

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Figure E–9 Required and Optional Operations<br />

OPEN<br />

a LOB<br />

CLOSE<br />

a LOB<br />

SELECT<br />

a LOB<br />

State Diagrams<br />

write<br />

append<br />

get<br />

chunk size<br />

State Diagrams<br />

User/<br />

Program<br />

A state diagram presents the attributes of a view. Attributes of a view have two<br />

states—visible or invisible. In this example, a state diagram (the Queue, Name,<br />

Address, and Protocol boxes in the gray area at the bottom of the figure) is added<br />

below a use case diagram to show all the attributes of the view.<br />

Figure E–10 shows that the view is for querying queue subscribers. You can<br />

stipulate one attribute, some combination of the four attributes, or all four<br />

attributes.<br />

Unified Modeling Language Diagrams E-7

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