Extensions.EventHandling.GetNewValue

Classification

Name	GetNewValue
Short Description	Return the value that was stored in the given event
Class	Term
Extension	OTX EventHandling extension
Group	Event source property related terms
Exceptions	TypeMismatchException
Checker Rules	-
Standard Compliant	Yes

OTL Syntax

Term EventHandling.GetNewValue(EventTerm event);

Description

The OTX GetNewValue term shall only be applied to events which were fired by a MonitorChangeEventSource or one of its descendants. The term shall return the value which was stored in the given Event; that value represents a snapshot of the monitored variable's new value at the time when the event was fired. The term is useful to find out which new value a variable had after it changed.

If the specified event has not been raised by a MonitorChangeEventSource or one of its descendants, the TypeMismatchException exception will be thrown.

Important: Because of it the data type of the variable, the monitor change by event source depends was monitored, the return type is getNewValue usually not known at the authors. Therefore, type-safety of this term not be verified statically. Runtime exceptions can occur if the results of that term in the wrong place, for example when using. otx:ToInteger to a value that can not be converted to integer.

Return Value

The Term returns the value, see table below.

In OTX, Terms are categorized according to its return data type!

Data Type	Description
BlackBox	The value that was stored in the given event.

Properties

Name	Data Type	Class	Default	Cardinality	Description
Event	Event	Term	-	[1]	Represents the monitor change event from which the new value of the formerly monitored variable at the time of value change shall be returned.

OTL Examples

/// Local Declarations

EventHandling.Event Event1;
String Variable1 = "String";
EventHandling.EventSource EventSource1;
BlackBox.BlackBox BlackBox1;

/// Flow

EventSource1 = EventHandling.MonitorChangeEventSource(Variable1);

parallel
{
	lane
	{
		EventHandling.WaitForEvent({EventSource1}, Event1);
	}
	lane
	{
		Variable1 = "String changed";
	}
}

BlackBox1 = EventHandling.GetNewValue(Event1);

See also

IsMonitorChangeEvent
IsThresholdExceededEvent
IsTimerExpiredEvent