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Create and display diagram in Netbeans RCP application

jph

Hello,

I am developing a NetBeans RCP application to provide static representations of exisitng processes.
I would like to be able to read existing .bpmn20.xml files and display the diagrams in a NB RCP top component.

Could you point me to existing example or show me which libraries / API can be used.

Thank you in advance,

JP

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Comments

jbarrez

How do you want to display it? Is an image enough? If so, the engine can autogenerate them for you.

jph

Yes. An image is good enough.
Can you provide some additional info on which APIs / classes would need to be used, which libraries loaded in NB, a small example would be great also 🙂

Thanks
JP

frederikherema1

You only need the activiti-engine and it's dependencies. To fetch the diagram, see extract of our javadocs for RepositoryService:

InputStream getProcessDiagram(String processDefinitionId)
Gives access to a deployed process diagram, e.g., a PNG image, through a stream of bytes.
Parameters:
processDefinitionId - id of a ProcessDefinition, cannot be null.
Returns:
null when the diagram resource name of a ProcessDefinition is null.
Throws:
ActivitiObjectNotFoundException - when the process diagram doesn't exist.

jph

Thank you for following up on my question. I followed your advice in trying to get the diagram but the return value of is (see below) is null.

Is there anything else I should do during initialization? I see for instance that "isGraphicalNotationDefined" is false for the processDefinition?

Thank you

package org.ncia.npc.ProcessViewerActiviti;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.DeploymentBuilder;
import org.activiti.engine.repository.ProcessDefinition;

/**
*
* @author JPH
*/
public class ProcessDiagramActiviti {

    private RepositoryService repositoryService;
    private String pdID;

    public void deploy() {
        ProcessEngine processEngine = ProcessEngineConfiguration.createStandaloneInMemProcessEngineConfiguration()
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE)
                .setJdbcUrl("jdbc:h2:mem:my-own-db;DB_CLOSE_DELAY=1000")
                .setJobExecutorActivate(true)
                .buildProcessEngine();
        repositoryService = processEngine.getRepositoryService();
        DeploymentBuilder deployBuilder = repositoryService.createDeployment()
                .name("userWorkflow.bar")
                .addClasspathResource("resources/userWorkflow.bpmn20.xml");
        Deployment deployment = deployBuilder.deploy();
    }

    public void getDiagram() throws FileNotFoundException, IOException {
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().singleResult();
        pdID = processDefinition.getId();
        try{
        InputStream is = repositoryService.getProcessDiagram(pdID);
        OutputStream os = new FileOutputStream("images\\userWorkflow.png");
        byte[] buffer = new byte[1024];
        int bytesRead;
        //read from is to buffer
        while ((bytesRead = is.read(buffer)) != -1) {
            os.write(buffer, 0, bytesRead);
        }
        is.close();
        os.flush();
        os.close();
        }
        catch(IOException e) {
        }
    }
}

jph

Thank you for your patience Joram and Frederik. I spent some more time on the week-end learning about activiti and found an answer to my questions.