CS223 2004F : Class 34: Design Heuristics (6): Obtaining Objects to Use

Class 34: Design Heuristics (6): Obtaining Objects to Use

Held: Friday, 19 November 2004

Summary: Today we conclude our discussion of Riel by considering when (and when not) to make particular use choices.

Related Pages:

Assignments

Read chapters 1 and 2 of Design Patterns.

Notes:

We will continue with the real whiteboard + note taker approach.

We may have prospective students here today.

Overview:

Choosing how to get objects to use

Riel's heuristics

Our heuristics

Strategies for Selecting a Use Relationship

We know a variety of ways to obtain something to use:

Contain the thing
Contain the thing by association
Receive the thing as a parameter
Query an oracle to receive the thing
Refer to a very global variable
Create the thing
Permit an oracle to forward the request

When should we use a particular strategy? When should we not use a particular strategy?

What heuristics does Riel provide?

What heuristics do we have?

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Samuel A. Rebelsky, rebelsky@grinnell.edu