Flyweight

Darren

Five same objects

Motivation

Intrinsic

It consists of information that's independent of flyweight's context.

Extrinsic

Extrinsic state depends on and varies with the flyweight's context.

Intrinsic

• character code

Extrinsic

• coordinate position
• typographic style

Glyph

Character

Row, Column

Glyph

Character

Row, Column

Aplicability

• An Application uses a large number of objects
• Storage costs are high
• Most object state can be made extrinsic
• Many groups of objects may be replaced by relatively few shared objects once extrinsic state is removed

Q&A