topic Re: Display current task within a process instance in Alfresco Archive

Display current task within a process instance

mikepoole — Mon, 16 Jul 2012 15:06:42 GMT

I think this question has been asked before but I have never managed to track down an answerIs there any way to display the process diagram AND show which task the user is currently on. I have seen mention of the ProcessDiagramImageGenerator API but cannot find anything that shows the way to show th

Re: Display current task within a process instance

frederikherema1 — Tue, 17 Jul 2012 06:53:46 GMT

Use this:


 public static InputStream generateDiagram(ProcessDefinitionEntity processDefinition, String imageType, List<String> highLightedActivities) {

Example usage in activiti-explorer code:


 ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService).getDeployedProcessDefinition(processInstance
            .getProcessDefinitionId());

    if (processDefinition != null && processDefinition.isGraphicalNotationDefined()) {
      
      InputStream definitionImageStream = ProcessDiagramGenerator.generateDiagram(processDefinition, "png", 
        runtimeService.getActiveActivityIds(processInstance.getId()));

Re: Display current task within a process instance

mikepoole — Tue, 17 Jul 2012 14:09:22 GMT

Thanks Frederik

When I attempt to run this code…

 ProcessEngine processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("activiti.cfg.xml").buildProcessEngine();
  RuntimeService runtimeService = processEngine.getRuntimeService();
  RepositoryService repositoryService = processEngine.getRepositoryService();
  ProcessDefinitionQuery processDefQ = repositoryService.createProcessDefinitionQuery().processDefinitionKey("ProcessDEADLINE");

  System.out.println("Count: " + processDefQ.count());

  for(ProcessDefinition p: processDefQ.list()){
   if(p.getVersion() == processDefQ.count()){
    ProcessInstance pi = runtimeService.createProcessInstanceQuery().processDefinitionId(p.getId()).singleResult();

    InputStream is = ProcessDiagramGenerator.generateDiagram((ProcessDefinitionEntity) p, "png", runtimeService.getActiveActivityIds(pi.getId()));
    OutputStream out = new FileOutputStream(new File("C:\\Mike data\\Diagram.png"));

    int read = 0;
    byte[] bytes = new byte[1024];
    while ((read = is.read(bytes)) != -1) {
     out.write(bytes, 0, read);
    }

    is.close();
    out.flush();
    out.close();

   }
  }

I get the following error…

Exception in thread "main" java.awt.image.RasterFormatException: (x + width) is outside raster
 at sun.awt.image.IntegerInterleavedRaster.createWritableChild(IntegerInterleavedRaster.java:450)
 at java.awt.image.BufferedImage.getSubimage(BufferedImage.java:1156)
 at org.activiti.engine.impl.bpmn.diagram.ProcessDiagramCanvas.generateImage(ProcessDiagramCanvas.java:166)
 at org.activiti.engine.impl.bpmn.diagram.ProcessDiagramGenerator.generateDiagram(ProcessDiagramGenerator.java:236)
 at org.iop.production.ProcessDiagramImageGenerator.main(ProcessDiagramImageGenerator.java:38)

I have checked my XML file (created via the Eclipse plugin) and it appears that all elements have a name and x and y co-ordinates and the XML has all the DI information

What am I doing wrong?

Many thanks

Mike

Re: Display current task within a process instance

frederikherema1 — Tue, 17 Jul 2012 14:16:43 GMT

Please use the code I gave you, not sure this is causing the issue you mention, but it's the way you should use it:


ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService).getDeployedProcessDefinition(processInstance
            .getProcessDefinitionId());

Using the query to obtain a processDefinition doesn't initialize in internal activity-structure, rather it's just a entity representing database-row…

Re: Display current task within a process instance

mikepoole — Tue, 17 Jul 2012 14:42:30 GMT

Frederik,

That is absolutely superb!!!! Works like a dream

(I was trying to also find my way round the Engine API and whole relationships so I seemed to just cherry pick the bits I thought I needed from your code! Won't make that mistake again!)

Many many thanks

Mike

Re: Display current task within a process instance

fchatzia — Thu, 28 Mar 2013 09:35:13 GMT

Frederic i tried to use this* code but RepositoryServiceImpl is not recognized as a class what am i missing?

ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService).getDeployedProcessDefinition(processInstance
            .getProcessDefinitionId());

Re: Display current task within a process instance

frederikherema1 — Thu, 28 Mar 2013 10:56:40 GMT

This class is part of activiti-engine, otherwise it wouldn't work.. What import are you using? the class is in org.activiti.engine.impl.RepositoryServiceImpl

Re: Display current task within a process instance

fchatzia — Thu, 28 Mar 2013 12:09:19 GMT

Thank you very much frederik for the
immediate answer, i suppose that eclipse has a bad day and doesn't make suggestions. When i import the class you wrote the problem was solved.

Re: Display current task within a process instance

mixit_em — Thu, 19 May 2016 13:17:57 GMT

The Example is working fine…

Can we export the active task diagram
ie. i have a large process diagram, so don't want to export the whole diagram, instead i wish if it is possible to export the cropped digram that shows only active task with surrounding tasks only…

Thank you

Re: Display current task within a process instance

raviksoni25 — Wed, 10 Jan 2018 10:03:44 GMT

Hi , Is there any way to get current task and next task?

I would prefer any REST API if available.

Thanks

Re: Display current task within a process instance

Anonymous — Thu, 11 Jan 2018 03:00:10 GMT

Please use this rest api to get current task.

Activiti User Guide

If you need to get next task too, you need to make custom logic useing ProcessDiagramGenerator.

Activiti/modules/activiti-image-generator/src/main/java/org/activiti/image at 6.x · Activiti/Activiti · GitHub

The following url is my sample using ProcessDiagramGenerator.

In addition to this sample, it is necessary to add custom logic to acquire an activity ID to be independently connected.

generateDiagram/GenerateDiagramSample.java at master · daisuke-yoshimoto/generateDiagram · GitHub

Re: Display current task within a process instance

nhhao1996 — Thu, 21 Feb 2019 08:12:24 GMT

how I can set variable processInstance? ProcessInstance processInstance = ???