WSO2 Business Process Server v3.0.1 Documentation

##### Overview

- Home
- Release Note
- WS-BPEL Compliance
- License

##### Downloads

- Releases

##### Installation Guide

- Installing WSO2 BPS

##### Quick Start Guide

- Modeling the process
- Deploying the process
- Testing the process

##### User Guide

- Deploying BPEL Processes
- Deploying Human Tasks
- Managing BPEL processes
- Managing BPEL process instances
- QoS for BPEL processes
- Securing BPEL processes
- Invoking secured partner services
- Versioning
- Management API

##### Human Task Guide

- Human Tasks Quick Start Guide
- Deploying HumanTasks
- Managing Tasks
- Developing a Human Task Artifact
- Human Task Management and Configuration
- Human Task Concepts

##### Administrator Guide

- External data sources Configuration
- Registry Configuration
- Events
- Unified Endpoints
- BPEL Extensions
- Transaction Factory Configuration
- Message Exchange Interceptors
- OpenJPA specific properties
- JMS Transport Configuration
- Process Instance Cleanup Tasks
- Process Hydration and Dehydration
- Enabling Peer-to-Peer(P2P) Communication
- Setting up a BPS Cluster

##### Best Practices

- Process Deployment Best Practices

##### Concepts

- Process Versioning
- Process instance events
- Partner links

##### WS-BPEL Extensions

- Activity Failure and Recovery
- Extension Activities and Extensible Assign Operations
- XPath Extensions
- Iterable ForEach
- Flexible Assigns
- BPEL4People Extension

##### Samples

- HelloWorld
- If-Else
- ForEach
- While
- Repeat Until
- Flow and Links
- Pick
- Synchronous and Asynchronous Service Invocations
- Fault Handling
- Split
- XslTransform
- Compensation Handler
- Event Handler

##### Resources

- FAQ
- External Articles
- Library
- Source Code

##### Community

- Forum
- Mailing Lists

##### Project Information

- Issue Tracking

# Sample Guide - Repeat Until

### Table of Content

- Objective
- Prerequisites
- Overall Idea

### Objective

Explains the functionality of <repeatUntil/> construct, where the repetitive task should be executed at least once. This functionality also can be achieved via <while/>. But how the logical condition used in both cases differs.

### Prerequisites

- Log in into BPS server admin console.
- Under Business Processes -> Add BPEL.
- Upload the TestRepeatUntil.zip , (all samples are located at our sample repository.)
- Under the Business Processes -> Processes.
- Under the WSDL details widget -> Create instance

### Overall Idea

Refer TestRepeatUntil.zip

eg -

    <repeatUntil name="RepeatUntil">
        <assign validate="no" name="IncrementCounter">
            <copy>
                <from><![CDATA[$counter + 1]]></from>
                <to variable="counter">
                </to>
            </copy>
        </assign>
        <condition><![CDATA[$counter >= 10]]></condition>
    </repeatUntil>

Here we increment counter variable until it's equal to 10.

If you refer TestWhile.zip, the logical condition in <while/> is exactly the negation used in <repeatUntil/> to do the same thing.

eg -

    <while name="While">
        <condition><![CDATA[$counter < 10]]></condition>
        <assign validate="no" name="IncrementInput">
            <copy>
                <from><![CDATA[$counter + 1]]></from>
                <to variable="counter">
                </to>
            </copy>
        </assign>
    </while>