Extensions.StateMachineProcedure.Trigger

Classification

Name	Trigger
Short Description	A trigger defines the wait action for a state.
Class	Named And Specified
Base Data Type
Default Value	Empty
Provide a Literal	No
SpecifiedBy	ISO 13209-4
Standard Compliant	Yes

Description

A trigger defines the wait action for a state. A trigger mainly consists of one or more event sources. It has the same behaviour as the WaitForEvent action in OTX EventHandling extension. An arbitrary number of triggers can be defined for each state. A trigger can be referred to by one or more transitions.

After execution of the entry flow the state blocks the thread of execution until it receives an event from one of its trigger event sources. As soon as an event becomes available in one of the sources event queues, the condition in the referenced transitions will be checked in order of occurrence in XML.

Important: A trigger can be referenced by the target attribute of a transition trigger. Therefore the name attribute is mandatory for triggers (unlike the base type NamedAndSpecified where it is optional). This is enforced by <xsd:key> constraints specified in the OTX schema.

Sample

	trigger : Trigger1
	{
		EventHandling.TimerExpiredEventSource(1000)
	}