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Repeat Until

BPMN Implementation: Repeat Pattern

The Repeat Until activity executes an activity repeatedly until its condition evaluates to true. In contrast to the While activity, the Repeat Until loop executes the contained activity at least once.

Required Properties	Optional Properties
Condition	Name. See Selecting Activity Labels
	Join Condition. See Creating a Join Condition for an Incoming Link
	Suppress Join Failure. See Process Properties
	Comment. See Adding Comments to a Process
	Documentation. See Adding Documentation to a Process
	See Setting Visual Properties and Using Your Own Library of Images.
	Execution State. See Viewing the Execution State of an Activity or Link
	Extension Attributes and Extension Elements. See Declaring Extension Elements and Attributes.

To build a Repeat Until:

From the Control Flow
palette, drag a Repeat Pattern
activity to the Process Editor canvas.

Double-click the Repeat Until to open the Condition Builder and build a Boolean expression. For details, see Using the Expression Builder.

Drag an activity, such as a Scope or Invoke, inside the Repeat Until.

Specify all the properties for each activity in the Repeat Until.

XML Syntax

<repeatUntil standard-attributes>
    standard-elements
    activity
  <condition expressionLanguage="anyURI"?>
   bool-expr
  </condition>
</repeatUntil>

Example:

<repeatUntil>
  <condition
   expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:
     xpath1.0">$counter &gt; 0
  </condition>
      <sequence>
       <assign name="IncrementCounter">
        <copy>
         <from>$counter + 1</from>
         <to variable="counter"/>
        </copy>
       </assign>
       <wait name="WaitTwoSeconds">
        <for expressionLanguage=
          "urn:oasis:names:tc:wsbpel:2.0:sublang:xpath1.0">
            'PT2S'
        </for>
       </wait>
      </sequence>
</repeatUntil>

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