https://github.com/npdeehan/multi-instance-user-example
A Camunda example showing how multiple user inputs can be used to decided the path of a process.
https://github.com/npdeehan/multi-instance-user-example
Last synced: 5 months ago
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A Camunda example showing how multiple user inputs can be used to decided the path of a process.
- Host: GitHub
- URL: https://github.com/npdeehan/multi-instance-user-example
- Owner: NPDeehan
- License: apache-2.0
- Created: 2021-01-21T10:33:03.000Z (over 5 years ago)
- Default Branch: main
- Last Pushed: 2021-01-21T10:54:42.000Z (over 5 years ago)
- Last Synced: 2025-01-23T01:34:33.866Z (over 1 year ago)
- Language: HTML
- Size: 110 KB
- Stars: 2
- Watchers: 1
- Forks: 3
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Camunda Multi-Instance User Task Example
This is a simple example project to help demonstrate how inputs from multiple
users can be gathered together to help decide how the process should proceed based on the
user consensus.
The example uses the idea of a vote. Where X users in parallel are asked to cast a vote
`yes`or `no`for a candidate. If the majority vote `yes` the process moves on to a user task congradulated the
victor is not, we console them.
## To Run the Project
This is a Spring Boot project with an embedded Camunda engine.
To run it simply import it into your Java IDE and build it with maven to get the dependencies
and run the ``Application.java`` class from within your IDE.
## How does it work
When the process starts it will create a user task for each vote needed.
After each user task is completed a listener will add the vote to the running tally.
```java
@Named
public class VoteCountListener implements TaskListener {
@Override
public void notify(DelegateTask delegateTask) {
// Get the current variables
Long yesVotes = (Long) delegateTask.getVariable("yesVotes");
Long noVotes = (Long) delegateTask.getVariable("noVotes");
boolean approved = (boolean)delegateTask.getVariable("approved");
if(approved){
delegateTask.setVariable("yesVotes", yesVotes+1L);
}else{
delegateTask.setVariable("noVotes", noVotes+1L);
}
// Now i'll removed the variables so that no other task are affected by it.
delegateTask.removeVariable("approved");
delegateTask.removeVariable("name");
}
}
```
After all votes are completed a simple expression on the sequence flows leaving the
XOR gateway will decide on the direction.
`` #{yesVotes > noVotes} `` in the case of a draw votes will be recast.
If you feel this example is missing something, I'm very happy to get pull requests.