Extensions

Extensions are used to change or access internals of the state machine. For example logging can easily be implemented with an extension.

Changing the Behaviour of a State Machine

Extensions can change the behaviour of the state machine in these ways:

• change the state into which the state machine is initialized
• change the event and/or event arguments fired on the state machine
• change the exceptions thrown by the state machine with custom exceptions
• Firing events on the state machine as a reaction to a call on the extension (e.g. perform transition to the error state on an exception)

Interface

A state machine extension has to implement the IExtension<TState, TEvent> interface.

You can use the ExtensionBase class in the namespace Appccelerate.StateMachine.Extensions to derive your extensions. The ExtensionBase class implements all interface members with virtual methods.