Call REST API from listener

Camunda 7 Topics Discussion & Questions
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1

Hi!

I’ve added a ‘create’ task listener to one of the tasks, and I’m wondering if I can use it to do some API calls to get some data from the DB, like the users. Right now, I do it using AngularJS from the embedded form code, but it’s getting messy as I add more calls like the following:

$scope.getUsers = function() {
    return $http.get(Uri.appUri('engine://engine/:engine/user'), {
        headers: {
            'Content-Type': "application/json;charset=utf-8"
        },
        body: {
            'sortBy': 'userId',
            'sortOrder': 'asc'
        }
    });
}

How could I do the same inside the notify method of the task listener class?

Thanks,

2

You can use a library to run a http request. Similar to using HTTP-Connector.

Many examples on the forum.

3

Hi!

I thought that it would be necessary to use some of Camunda’s classes. I’ll do some tests with Apache HTTPComponents to see if it works.

Thanks!

4

Hi again,

One more question: With Angular, I use $http.get(Uri.appUri('engine://engine/:engine/user') to request the users. What would be the URL to call from Java? I’ve tried the following but it doesn’t work:

HttpGet httpGet = new HttpGet("/camunda/api/engine/engine/default/user");

Unless necessary, I wouldn’t like to write the full URL in the code, to avoid changing it when we change the server’s address. Is this possible?

Thanks!

5

You can use the internal apis if you want to access Camunda resources: execution.getProcessEngineServices().getIdentityService()…

6