[jboss-user] [jBPM] - jBPM 4 - Deploy only if ProcessDefinition changed or new

[Andrea Castangelo]

rapa [http://community.jboss.org/people/rapa] created the discussion

"jBPM 4 - Deploy only if ProcessDefinition changed or new"

To view the discussion, visit: http://community.jboss.org/message/570056#570056

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Hi,

I successfully integrated jBPM 4.4 with Seam 2.2, running on JBoss 4.2. 

In my overridden Jbpm class I deploy all process definitions, which are got from the components.xml 

 
   <bpm:jbpm>
        <bpm:process-definitions>
            <value>bpm/processdefinitions/process_1.jpdl.xml</value>
            <value>bpm/processdefinitions/process_2.jpdl.xml</value>
            <value>bpm/processdefinitions/process_3.jpdl.xml</value>        </bpm:process-definitions>
    </bpm:jbpm>



    <bpm:jbpm>
        <bpm:process-definitions>
            <value>bpm/processdefinitions/partner_registration.jpdl.xml</value>
        </bpm:process-definitions>
    </bpm:jbpm>

The process definitions file paths (resource names) are automatically injected in the String[] processDefinitions array (see Jbpm class)

By having all file paths it is easy to deploy  the process definitions through the repository service, but I would like to avoid to deploy them each time
I restart my application server.

What I would like to do is to deploy my process definitions only if the xml file is new or has been modified since it's last deployment. The idea is simple: I just compare the last deployed process definition's xml content with the one of the current process definition.

There is a method in the repository service that allows to get the deployed process definition's xml content

repositoryService.getResourceAsStream(deploymentId, resourceName);


I see that the jbpm4_lob table is the one that contains all the required data (resource_names, deployment_ids, xml files contents), so there must be
a way to retrieve what I need.

The problem is that I looked into the jbpm 4.4 api and I don't see any way to retrieve the highest deploymentId for a given resource name. The only way is to use the process definition key or name, but I would have to map these manually somewhere to their resource name or parse the xml files, which would be very nasty and I absolutely want to avoid that.

Here is the code of my Jbpm class.

@Name("jbpm")
@Scope(ScopeType.APPLICATION)
@AutoCreate
@Startup
@BypassInterceptors
@Install(precedence = Install.APPLICATION)
public class Jbpm extends SeamComponent {
     
    @Getter 
    private ProcessEngine processEngine;
    @Getter @Setter
    private String[] processDefinitions;
    
    @Create
    public void init() {
       // ...
 
       deployProcessDefinitions();
 
       // ...
    }
 
   /**
     * Deploys all changed or new process definitions. 
     */
    private void deployProcessDefinitions() {
        
      RepositoryService repositoryService = this.processEngine.getRepositoryService();
      for (String processDefinition : this.processDefinitions) {
 
           // deploy d only if new or it has changed
           if(isNewOrChanged(processDefinition)) {
              NewDeployment d = repositoryService.createDeployment()
                                    .addResourceFromClasspath(processDefinition); 
              String newDeploymentId = d.deploy();
           }
 
      }
 
      private String isNewOrChanged(processDefinition) {
 
          // how to get deploymentId???
 
          InputStream is = repositoryService.getResourceAsStream(deploymentId, processDefinition);
          String xml = convertStreamToString(is);
 
          // ...
      }
 



Anyone has a solution for this?

Thanks, cheers!
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