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Re: Message Event (throw and catch problem)
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created by <a href="http://community.jboss.org/people/krishanps">krishanps</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/643600#643600">View the full discussion</a>
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<div class="jive-rendered-content"><p>Yes, of course. So I just give a reference to ksession from the main-method to the implemented MessageEventSendTaskHandler.java. So I can use it to call a signalEvent to initiate the message catch event.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My implementation changes:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table border="1" cellpadding="3" cellspacing="0" class="jiveBorder" style="width: 100%; border: 1px solid #000000;"><tbody><tr><th align="center" style="border:1px solid black;border: 1px solid #000000;background-color: #6690bc;" valign="middle"><span style="color: #ffffff;"><strong>*.java<br/></strong></span></th></tr><tr><td style="border:1px solid black;border: 1px solid #000000;"><p>public static final void main(String[] args) {</p><p>        try {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            // load up the knowledge base</p><p>            KnowledgeBase kbase = readKnowledgeBase();</p><p>            StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();</p><p>            </p><p>            //creates an own SendTaskHandler to work on the same ksession to initiate a message event catch call</p><p>            <span style="color: #ff0000;">MessageSendTaskHandler msgSendTaskHandler = new MessageEventSendTaskHandler();</span></p><p><span style="color: #ff0000;">            msgSendTaskHandler.setStatefulKnowledgeSession(ksession);</span></p><p>            </p><p>            KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test");</p><p>            ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new DoNothingWorkItemHandler());</p><p>            ksession.getWorkItemManager().registerWorkItemHandler("Send Task", <span style="color: #ff0000;">msgSendTaskHandler</span>);                        </p><p>            Map<String, Object> params = new HashMap<String, Object>();</p><p>            params.put("x", "MyValue");</p><p>            params.put("y", "OtherValue");</p><p>            // start a new process instance</p><p>            ProcessInstance processInstance = ksession.startProcess("IntermediateCatchEvent", params);                        </p><p>            logger.close();</p><p>        } catch (Throwable t) {</p><p>            t.printStackTrace();</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private static KnowledgeBase readKnowledgeBase() throws Exception {</p><p>        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();</p><p>        kbuilder.add(ResourceFactory.newClassPathResource("BPMN2-IntermediateCatchEventMessage.bpmn2"), ResourceType.BPMN2);</p><p>        return kbuilder.newKnowledgeBase();</p><p>    }</p><p>}</p></td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The Implemented SendTaskHandler.java</p><table border="1" cellpadding="3" cellspacing="0" class="jiveBorder" style="width: 100%; border: 1px solid #000000;"><tbody><tr><th align="center" style="border:1px solid black;border: 1px solid #000000;background-color: #6690bc;" valign="middle"><span style="color: #ffffff;"><strong>MessageEventSendTaskHandler.java</strong></span></th></tr><tr><td style="border:1px solid black;border: 1px solid #000000;"><p>public class  MessageEventSendTaskHandler implements WorkItemHandler {</p><p>    </p><p>    private StatefulKnowledgeSession ksession;</p><p>    private long processInstanceID;</p><p>    </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {</p><p>        String message = (String) workItem.getParameter("Message");</p><p>        System.out.println("Die gesendete Nachricht: " + message);                </p><p>        //starts Message Catch Event </p><p>        getStatefulKnowledgeSession().signalEvent("Message-_8_Message", "hi",   getStatefulKnowledgeSession().getProcessInstance(1).getId());</p><p>        manager.completeWorkItem(workItem.getId(), null);</p><p>      </p><p>    }</p><p>    </p><p>    public void setStatefulKnowledgeSession(StatefulKnowledgeSession ksession){</p><p>        this.ksession = ksession;</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public StatefulKnowledgeSession getStatefulKnowledgeSession(){</p><p>        return this.ksession;</p><p>    }</p><p>}</p></td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If you have questions feel free to post your questions :-)</p></div>
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