topic Re: API to fetch the diagram for Process Instance in Alfresco Archive

API to fetch the diagram for Process Instance

mittalabhi86 — Fri, 30 May 2014 08:45:10 GMT

Hi,I know I can use ProcessDiagramGenerator.generateDiagram(BPMNMpdel, ImageType, Activities)‍ to get the pictorial view of a process instance at any given time. This image indicates the tasks currently in process by outlining them in red. What I want is, how can I get an image which will indicate t

Re: API to fetch the diagram for Process Instance

jbarrez — Fri, 30 May 2014 09:28:01 GMT

That isn't in Activiti at the moment. The logic of ProcessDiagramGenerator could be enhanced to show past tasks though.

Re: API to fetch the diagram for Process Instance

mittalabhi86 — Fri, 30 May 2014 17:48:51 GMT

Thanks for your prompt response.

Yes. I feel, this would be a good to have functionality. Showing the status of all the processing & processed activities should be the part of pictorial view of a process instance at any spur of moment. I remember I have worked on a similar tool which used to show diagram in following manner:
<blockcode>
1. For all the pending tasks, background was default.
2. For all the currently running tasks, bg gets turned to yellow.
3. For all successfully completed tasks, bg gets turned to green.
4. For all the tasks ended in error, were turned to red.
</blockcode>
Something on this line shall be very useful. Please suggest, are we already planning to have this functionality in near future?

Regards
Abhishek

Re: API to fetch the diagram for Process Instance

jbarrez — Mon, 02 Jun 2014 09:40:07 GMT

No, that's not on our roadmap currently (but the cheesy answer would be we welcome any code contribution 😉 )

Re: API to fetch the diagram for Process Instance

saig0 — Mon, 02 Jun 2014 10:40:56 GMT

Hi Abhishek!

You can use <java>ProcessDiagramGenerator.generateDiagram(bpmnModel, imageType, activityIds, flowIds)</java> to generate an image that shows the current activities and the passed flows / transitions.

Regards,
Philipp

Re: API to fetch the diagram for Process Instance

mittalabhi86 — Mon, 02 Jun 2014 16:49:13 GMT

Thanks Philipp. Will try that!

Regards
Abhishek

Re: API to fetch the diagram for Process Instance

mittalabhi86 — Mon, 02 Jun 2014 20:00:41 GMT

Hi Philipp,

Is the ids of incoming transition to the current activity, or is the ids of all the possible transitions?

Regards
Abhishek

Re: API to fetch the diagram for Process Instance

saig0 — Tue, 03 Jun 2014 06:04:43 GMT

Hi Abhishek,

you assign the ids of all transitions you want to mark on the generated image. If you want to show an image with the current state and the executed path then you have to resolve all passed transitions and assign to the method.
For example:
<java>
        List<String> activeAtivityIds = runtimeService.getActiveActivityIds(processInstanceId);
        List<String> activeAndHistorcActivityIds = // resolve active and historic activitities

        List<String> flows = new LinkedList<String>();
        for (Process process : bpmnModel.getProcesses()) {
            for (FlowElement flowElement : process.getFlowElements()) {
                if (flowElement instanceof SequenceFlow) {
                    SequenceFlow sequenceFlow = (SequenceFlow) flowElement;
                    String from = sequenceFlow.getSourceRef();
                    String to = sequenceFlow.getTargetRef();
                    if (activeAndHistorcActivityIds .contains(from) &&
                                activeAndHistorcActivityIds .contains(to)) {
                        flows.add(sequenceFlow.getId());
                    }
                }
            }

        InputStream in = ProcessDiagramGenerator.generateDiagram(bpmnModel, "png", activeAtivityIds, flows);
</java>

Regards,
Philipp

Re: API to fetch the diagram for Process Instance

mittalabhi86 — Tue, 03 Jun 2014 06:23:12 GMT

Thanks Philipp!
In the meanwhile after sending you the query, I figured that out. Anyways, are we planning to integrate this feature in api itself to track the activities & flows completed, while preparing the diagram?

Re: API to fetch the diagram for Process Instance

martin_grofcik — Tue, 03 Jun 2014 06:30:01 GMT

Hi,

Process diagram (as a static model) does not cover loops, multiinstances… . I would prefer audit trail.
http://forums.activiti.org/content/audit-trail-diagram

Regards
Martin

Re: API to fetch the diagram for Process Instance

mittalabhi86 — Tue, 03 Jun 2014 07:04:45 GMT

Hi,

This looks somewhat close to what I want. Is it already implemented?

Regards
Abhishek

Re: API to fetch the diagram for Process Instance

martin_grofcik — Tue, 03 Jun 2014 07:26:18 GMT

Yes,
It is implemented in the activiti-crystalball (image-generator) project.
http://gro-mar.github.io/activiti-crystalball/
Regards
Martin