[jboss-user] [JBoss jBPM] - Re: Invoke jBPM workflow from external app

[hmuller]

Hi there,

I wrote the following class, which will invoke a workflow process.  I use this from a servlet which takes normal xml over http (not soap) and then calls the process with the parameters.


  | /**
  |  *
  |  */
  | public class WFProcessFactory {
  | 
  |     JbpmConfiguration jbpmConfig = null;
  | 
  |     /**
  |      * 
  |      * @param processId
  |      * @param processName
  |      * @param key
  |      * @param processVariables
  |      * @param signalStart
  |      * @return
  |      */
  |     public long startProcess(long processId, String processName, String key, HashMap processVariables, boolean signalStart) {
  |         long tokenId = 0;
  | 
  |         if (jbpmConfig == null) {
  |             jbpmConfig = JbpmConfiguration.getInstance();
  |         }
  |         JbpmContext jbpmContext = jbpmConfig.createJbpmContext();
  |         try {
  |             // get the session and process definition according to the process id
  |             GraphSession graphSession = jbpmContext.getGraphSession();
  | 
  |             ProcessDefinition processDefinition = null;
  |             if (processName.length() > 0) {
  |                 processDefinition = graphSession.findLatestProcessDefinition(processName);
  |             } else {
  |                 processDefinition = graphSession.getProcessDefinition(processId);
  |             }
  | 
  |             // if there are no process variables, then create an empty variable list
  |             if (processVariables == null) {
  |                 processVariables = new HashMap();
  |             }
  |             // startup the process, set its business key (for correlation purposes, and 
  |             // signal it to start going with the flow
  |             ProcessInstance processInstance = processDefinition.createProcessInstance(processVariables);
  | 
  |             processInstance.setKey(key);
  |             tokenId = processInstance.getRootToken().getId();
  |             if (signalStart) {
  |                 processInstance.signal();
  |             }
  |         } finally {
  |             jbpmContext.close();
  |         }
  |         return tokenId;
  |     }
  | }
  | 

The XML that I post to my servlet looks something like this.


  | Input:
  | 
  | 	<launch_workflow>
  | 	    <process_id>401</process_id>    OPTIONAL if process_name is specified
  | 	    <process_name>SomeProcessName</process_name>     OPTIONAL if process_id is specified
  | 	    <process_key>401_00001</process_key>
  | 	    <process_input>
  | 		<process_var>
  | 		    <var_name>item1</var_name>
  | 		    <var_value>value1</var_value>
  | 		</process_var>
  | 		<process_var>
  | 		    <var_name>item2</var_name>
  | 		    <var_value>value2</var_value>
  | 		</process_var>
  | 		<process_var>
  | 		    <var_name>item3</var_name>
  | 		    <var_value>value3</var_value>
  | 		</process_var>
  | 		<process_var>
  | 		    <var_name>item4</var_name>
  | 		    <var_value>value4</var_value>
  | 		</process_var>
  | 	    </process_input>
  | 	</launch_workflow>
  | 	
  | 
  | Output:
  | 
  | 	<launch_result>
  | 	    <token_id>499</token_id>
  | 	</launch_result>
  | 

One thing to take note of:  Don't re-instantiate the JBPMConfiguration object with each call, as this causes the server to run out of memory really quickly.

I hope that this helps.

Regards

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