Display current task within a process instance

[mikepoole]

I think this question has been asked before but I have never managed to track down an answer

Is 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 the current task

Any help would be very much appreciated

Many thanks

Mike

[frederikherema1]

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()));


[mixit_em]

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

[mikepoole]

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

[frederikherema1]

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…

[nhhao1996]

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

[mikepoole]

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

[fchatzia]

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());

[frederikherema1]

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

[fchatzia]

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.