66 lines
2.5 KiB
Markdown
66 lines
2.5 KiB
Markdown
# Exclusive Gateways Example
|
|
|
|
## Overview
|
|
|
|
Exclusive Gateways in BPMN serve as decision points that dictate the flow of a process based on conditional logic.
|
|
This example demonstrates the use of an Exclusive Gateway to manage conditional routing following user input from a form.
|
|
|
|
## Process Steps
|
|
|
|
|
|
|
|
1. **User Task: Show User Form**
|
|
|
|
|
|
- **Purpose**: Captures user data which influences pathway decisions.
|
|
- **Form Configuration**:
|
|
```json
|
|
{
|
|
"title": "First Name Required",
|
|
"type": "object",
|
|
"required": ["firstName"],
|
|
"properties": {
|
|
"firstName": {
|
|
"type": "string",
|
|
"title": "First name",
|
|
"default": "Chuck"
|
|
}
|
|
}
|
|
}
|
|
```
|
|
- **Role**: Collects inputs that determine the execution path through the Exclusive Gateway.
|
|
|
|
2. **Exclusive Gateway**: Evaluates the `firstName` property from the form to decide the subsequent pathway.
|
|
|
|
**Sequence Flows**:
|
|
|
|
**a**. **Others**: Leads to a general greeting for users not named "Chuck."
|
|
|
|
|
|
|
|
**For 'Others' Sequence Flow**:
|
|
- **Condition Expression**: `firstName != "Chuck"`
|
|
- Goes to **Manual Task**: "Hello to Others" displays a greeting to non-Chuck users.
|
|
|
|
**b**. **Chuck**: Directs to a personalized greeting for users named "Chuck."
|
|
|
|
|
|
|
|
**For 'Chuck' Sequence Flow**:
|
|
- **Condition Expression**: `firstName == "Chuck"`
|
|
- Goes to **Manual Task**: "Hi to Chuck" delivers a custom greeting to users named Chuck.
|
|
|
|
3. **Exclusive Gateway Merge**: Merges the paths from manual tasks: "Hello to Others" and "Hi to Chuck," continuing to the next unified step in the process.
|
|
|
|
|
|
|
|
4. **Manual Task: Show End Message**: Concludes the interaction by displaying a closing message and displays "Thank you for your participation, {{firstName}}."
|
|
|
|
|
|
|
|
After the manual task, marks the completion of the process through the end event.
|
|
|
|
Therefore, Exclusive Gateways are critical in BPMN for managing decisions within the workflow that require conditional logic based on user input or other process variables.
|
|
|
|
They ensure that the process flow is correctly directed based on specific conditions, preventing incorrect executions and ensuring that the process adapts dynamically to varying inputs.
|