Flyweight Pattern

The Flyweight pattern reduces the number of low-level, detailed objects within a system by sharing objects. If instances of a class that contain the same information can be used interchangeably, the Flyweight pattern allows a program to avoid the expense of multiple instances that contain the same information by sharing one instance.

UML representation

Benefits

The following lists the benefits of using the Flyweight pattern:
  • Reduction in the number of objects to handle
  • Reduction in memory and on storage devices, if the objects are persisted

When to Use

You should use the Flyweight pattern when all of the following are true:
  • The application uses a large number of objects.
  • Storage costs are high because of the quantity of objects.
  • The application doesn’t depend on object identity.
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