Core.Actions.Handler

Classification

Name	Handler
Short Description	Activity for the treatment of exceptions
Class	Compound Node
Extension	OTX Core library
Group	Compound node related actions
Exceptions	-
Checker Rules	Core_Chk016
Standard Compliant	Yes

OTL Syntax

try
{
   ...
}
catch (ExceptionType ExceptionVariable)
{
   ...
}
finally
{
   
}

Description

The OTX handler activity is used for Exception Handling. Is intended for unexpected behavior within a procedure, which is caused by Exceptions, see Throw activity. The handler activity consists of the following three blocks:

• Try

  The try block contains the section on exceptions to be monitored. An exception is thrown, processing interrupted and the matching the exception catch block is executed.

• Catch

  The catch block is the actual exception handling. Each handler activity has at least one catch block. Each catch block can be assigned to one exception (exception). If a matching catch block is found, no additional catch blocks are processed. If no matching catch block is found, the error handling to the next outer sequence is passed. An exception is raised in a catch block, this is also propagated to the next outer sequence.

• Finally

  The optional finally block is the cleanup of resources and is always executed, regardless of whether an exception or not occurred.

Throws an exception within the observed block (Try Block) these can be handled within the Catch Blocks. A Finally Block exists, it runs in any case after the try or catch block.

Important: If an activity can throw exceptions, lists the types of exceptions in the description of the activity.

Properties

Name	Data Type	Class	Default	Cardinality	Description
Try	Exception	Value	-	[1]	This property is valid only in the CATCH sector.
Catch	Exception	Variable	-	[0..1]	This property is valid only in the CATCH sector.

OTL Examples

List<Integer> listOfInteger = {1, 2, 3};
Integer result1;
OutOfBoundsException outOfBoundException;
String result2;
String result3;

// listOfInteger is a list of 3 items
try
{
   result1 = listOfInteger[6];
}
catch (OutOfBoundsException outOfBoundException)
{
   result2 = "I got an OutOfBoundException";
}
finally
{
   result3 = "I am in a Finally section";
}

See also

Group
Loop
Parallel
Branch
MutexGroup