topic Process diagram highlighting current process in Alfresco Archive

Process diagram highlighting current process

dm22 — Tue, 25 Jun 2013 08:14:04 GMT

Hi,I am currently a student using Activiti as part of a project. I have noticed from other forum posts that there is definitely a way to show a process diagram that highlights the current process. Activiti Explorer also contains this feature. Most of the other answers seem to just say "Look at the s

Re: Process diagram highlighting current process

frederikherema1 — Tue, 25 Jun 2013 09:21:00 GMT


  String processInstanceId = (String) getRequest().getAttributes().get("processInstanceId");
    
    if(processInstanceId == null) {
      throw new ActivitiIllegalArgumentException("No process instance id provided");
    }

    ExecutionEntity pi = (ExecutionEntity) ActivitiUtil.getRuntimeService().createProcessInstanceQuery()
        .processInstanceId(processInstanceId).singleResult();

    if (pi == null) {
      throw new ActivitiObjectNotFoundException("Process instance with id" + processInstanceId + " could not be found", ProcessInstance.class);
    }

    ProcessDefinitionEntity pde = (ProcessDefinitionEntity) ((RepositoryServiceImpl) 
        ActivitiUtil.getRepositoryService()).getDeployedProcessDefinition(pi.getProcessDefinitionId());

    if (pde != null && pde.isGraphicalNotationDefined()) {
      BpmnModel bpmnModel = ActivitiUtil.getRepositoryService().getBpmnModel(pde.getId());
      InputStream resource = ProcessDiagramGenerator.generateDiagram(bpmnModel, "png", ActivitiUtil.getRuntimeService().getActiveActivityIds(processInstanceId));

      InputRepresentation output = new InputRepresentation(resource, MediaType.IMAGE_PNG);
      return output;
      
    } else {
      throw new ActivitiException("Process instance with id " + processInstanceId + " has no graphic description");
    }

Extract from the REST-resource (org.activiti.rest.api.legacy.process.ProcessInstanceDiagramResource). The main idea is that you fetch the model, pass it to the diagram-generator together with the activities that need to be highlighted.

Re: Process diagram highlighting current process

dm22 — Wed, 26 Jun 2013 16:34:45 GMT

Hi Frederik,

Thanks for the quick reply. I have been trying to implement this for a few hours. My first point which could be a problem is I don't have the method "getDeployedProcessDefinition" for repository service. I am instead using "getProcessDefinition" which is available to select in my IDE. Could I be using an old version?

The main problem I am is having is that while debugging i noticed that "ExecutionEntity pi" is always null even though the process instanceId is valid. I have a very similar method that just returns the process diagram without highlighting the current process which works fine. I am unsure where I am going wrong here.

Many thanks!

Re: Process diagram highlighting current process

jbarrez — Thu, 27 Jun 2013 11:54:33 GMT

- Correct. You need to cast to (RepositoryServiceImpl) to get that method.

- It could very well be a case of lazy loading. It could be you need to explicitely fetch the data or execute the code within a custom command in Activiti.

Re: Process diagram highlighting current process

pravin1 — Wed, 06 Jan 2016 21:17:13 GMT

Hi

I have read through many forms. please clarify the below query. I am practicing activiti workflow mgnt. Both the wars activiti rest and activiti explorer deployed in jboss pointing to same port of H2 DB. i trying to fetch the records via activiti rest for the vacation request task (demo process) created via activiti explorer. I am able to retrieve the process without any issues.
http://localhost:8080/activiti-rest/service/query/process-instances - POST

request
——–

{
"processDefinitionKey":"vacationRequest",
"variables": [
        {
          "name": "employeeName",
          "type": "string",
          "value": "kermit",
          "operation" : "equals"
        }
      ]
}

response
——–
{
"data": [
    {
      "id": "4143",
      "url": "http://localhost:8080/activiti-rest/service/runtime/process-instances/4143",
      "businessKey": null,
      "suspended": false,
      "ended": false,
      "processDefinitionId": "vacationRequest:1:31",
      "processDefinitionUrl": "http://localhost:8080/activiti-rest/service/repository/process-definitions/vacationRequest:1:31",
      "activityId": "handleRequest",
      "variables": [],
      "tenantId": "",
      "completed": false
    }
],
"total": 1,
"start": 0,
"sort": "id",
"order": "asc",
"size": 1
}.

When i tried to generate the Process diagram highlighting current process using below api.
http://localhost:8080/activiti-rest/service/runtime/process-instances/4143/diagram

{
"message": "Bad request",
"exception": "Process instance with id '4143' has no graphical notation defined."
}

When i analyse the sample code, will get the exception when pde.isGraphicalNotationDefined() returns false.

if (pde != null && pde.isGraphicalNotationDefined()) {
..
}else {
      throw new ActivitiException("Process instance with id " + processInstanceId + " has no graphic description");
    }

Not sure how and where to set this variable to true in order to retrieve the Process diagram highlighting current process

Thanks in advance.

-
Pravin