Wal's Fish Tank

Wal's Fish Tank

This content is duplicated from Wal's Cosc324 lecture material of 2008. It has been reproduced with the permission of Lord Wal (One pattern to rule them all and in the design philosophy bind them!).

Simulated fish tank

• Lots of different kinds of fish
• Only ever one tank
• Multiple views possible
• Schools of fish
• Remoras and barnacles
• Fish spawn new fish

Singleton

Only ever one tank

Observer

Multiple views possible (FishView is a gui view)

Composite

Schools of fish

Decorator

Remoras and barnacles

Factory Method

Fish spawn new fish

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The Result

Note that this design does have flaws that are introduced by the use of patterns, see Design patterns break rules.