Singleton Pattern - Common Uses

Common Uses

  • The Abstract Factory, Builder, and Prototype patterns can use Singletons in their implementation.
  • Facade Objects are often Singletons because only one Facade object is required.
  • State objects are often Singletons.
  • Singletons are often preferred to global variables because:
    • They do not pollute the global name space (or, in languages with namespaces, their containing namespace) with unnecessary variables.
    • They permit lazy allocation and initialization, whereas global variables in many languages will always consume resources.

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