Borg

Enforces a behaviour like sharing the same state amongst all instances.

Use the Monostate pattern when

• The same state must be shared across all instances of a class.
• Typically this pattern might be used everywhere a Singleton might be used. Singleton usage however is not transparent, Monostate usage is.
• Monostate has one major advantage over singleton. The subclasses might decorate the shared state as they wish and hence can provide dynamically different behaviour than the base class.

• the logging class
• managing a connection to a database
• file manager

Yet to see this.