June 2018
Intermediate to advanced
280 pages
7h 46m
English
Content preview from Design Patterns and Best Practices in Java
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Implementation
The following diagram shows that the flyweight object is returned from the pool and, to function, it needs the external state (extrinsic) passed as an argument. Some flyweights can share state with others, but this is not an enforced rule:
We can distinguish the following actors in the implementation diagram:
- Client: The client code.
- FlyweightFactory: This creates flyweights if they do not exist, and returns them from the pool if they exist.
- Flyweight: The abstract flyweight.
- ConcreateShareableFlyweight: The flyweight designed to be have a shared state with its peers.
- ConcreateUnshareableFlyweight: The flyweight that does not ...
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