topic 'jBPM-like' state transitions in Alfresco Archive https://connect.hyland.com/t5/alfresco-archive/jbpm-like-state-transitions/m-p/43443#M23688 <HTML><HEAD></HEAD><BODY><SPAN>Hello Activiti community, </SPAN><BR /><BR /><SPAN>I'm trying to implement a "wait-state" model in Activiti, which I believe is done via the RuntimeService.signal() method and "receive" tasks. This approach chooses transitions based on the transition condition. Though this is standard BPMN2.0 behavior, I see a couple drawbacks compared to how jBPM 3.x works: </SPAN><BR /><BR /><STRONG>More work to implement models </STRONG><SPAN>(at least the way I've figured out, perhaps there's an easier way): One needs to create a transition condition on each transition such as ${transition == "t6"}, then set a process instance variable related to the condition (engine.getRuntimeService().setVariable(processInstanceId, "transition", "t6"):smileywink:. With jBPM, one only needs to give the transition a name. </SPAN><BR /><BR /><STRONG>Less transparent</STRONG><SPAN>: At least for the short term, the Activiti Eclipse based model designer doesn't display transition conditions on the model diagram.&nbsp; So the diagram doesn't show how the model will execute. </SPAN><BR /><BR /><SPAN>So I wrote a little code that adds the capability to choose a transition based on the transition name. Basically I wrote a new Command class based on SignalCmd named SignalViaNameCmd, then implemented a signal() method that uses this new Command: </SPAN><BR /><BR /><SPAN>This seems to work well, I'm interested in your comments….</SPAN><BR /><SPAN> </SPAN><BR /><SPAN>Brian </SPAN><BR /><BR /><SPAN>P.S.&nbsp; The code follows: </SPAN><BR /><BR /><SPAN>SignalViaNameCmd.java: </SPAN><BR /><PRE class="language-none line-numbers"><CODE><BR />package my.package.name;<BR /><BR />import java.io.Serializable;<BR />import java.util.ArrayList;<BR />import java.util.List;<BR /><BR />import org.activiti.engine.ActivitiException;<BR />import org.activiti.engine.impl.interceptor.Command;<BR />import org.activiti.engine.impl.interceptor.CommandContext;<BR />import org.activiti.engine.impl.persistence.entity.ExecutionEntity;<BR />import org.activiti.engine.impl.pvm.PvmTransition;<BR />import org.activiti.engine.impl.pvm.process.ActivityImpl;<BR />import org.apache.commons.lang.StringUtils;<BR /><BR />// this class based on SignalCmd.java<BR />public class SignalViaNameCmd implements Command&lt;Object&gt;, Serializable {<BR /><BR />&nbsp;&nbsp;&nbsp; public static final String INVALID_TRANSITION_MSG = " is not a valid transition for state ";<BR />&nbsp;&nbsp;&nbsp; public static final String DUPLICATE_TRANSITIONS_MSG =<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; " is used as a name for more than one outgoing transition of state ";<BR />&nbsp;&nbsp;&nbsp; public static final String TOO_MANY_TRANSITIONS_MSG =<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "Can only signal without a transition name if there is exactly one outgoing transition. ";<BR />&nbsp;&nbsp;&nbsp; public static final String IF_NAMED_ALL_MUST_HAVE_NAME_MSG =<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; "When signaling with a transition name, all outgoing transitions must have a name. ";<BR /><BR />&nbsp;&nbsp;&nbsp; private static final long serialVersionUID = 1L;<BR />&nbsp;&nbsp;&nbsp; protected String executionId;<BR />&nbsp;&nbsp;&nbsp; protected String signalName;<BR /><BR />&nbsp;&nbsp;&nbsp; public SignalViaNameCmd(String executionId, String signalName, Object signalData) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; this.executionId = executionId;<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; this.signalName = signalName;<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp; public Object execute(CommandContext commandContext) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (executionId == null) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new ActivitiException("executionId is null");<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ExecutionEntity execution = commandContext.getExecutionManager().findExecutionById(executionId);<BR /><BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (execution == null) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new ActivitiException("execution " + executionId + " doesn't exist");<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; signal(execution);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return null;<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp; // This method is loosely based on BpmnActivityBehavior.java.<BR />&nbsp;&nbsp;&nbsp; private void signal(ExecutionEntity execution) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // next line is inspired by ExecutionEntity.signal<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ActivityImpl activity = execution.getActivity();<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; List&lt;PvmTransition&gt; transitionsToTake = new ArrayList&lt;PvmTransition&gt;();<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; List&lt;PvmTransition&gt; outgoingTransitions = activity.getOutgoingTransitions();<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (signalName == null) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (outgoingTransitions.size() != 1) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new ActivitiException(TOO_MANY_TRANSITIONS_MSG + " State = '"<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; + activity.getProperty("name") + "'");<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; execution.take(outgoingTransitions.get(0));<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return;<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for (PvmTransition outgoingTransition : outgoingTransitions) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String name = (String) outgoingTransition.getProperty("name");<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (StringUtils.isBlank(name)) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new ActivitiException(IF_NAMED_ALL_MUST_HAVE_NAME_MSG<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; + showStateNameId(signalName, activity, outgoingTransition));<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (signalName.equals(name)) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; transitionsToTake.add(outgoingTransition);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (transitionsToTake.size() == 0) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new ActivitiException("'" + signalName + "'" + INVALID_TRANSITION_MSG + "'"<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; + activity.getProperty("name") + "'");<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (transitionsToTake.size() &gt; 1) { // bpmn supports this, but for<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // simplicity we do not yet<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; throw new ActivitiException("'" + signalName + "'" + DUPLICATE_TRANSITIONS_MSG + "'"<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; + activity.getProperty("name") + "'");<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; execution.take(transitionsToTake.get(0));<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />&nbsp;&nbsp;&nbsp; private String showStateNameId(String transitionName, ActivityImpl activity,<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PvmTransition outgoingTransition) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; String message =<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; " State = '" + activity.getProperty("name") + "', signaled transition = '" + transitionName<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; + "', transition Id = '" + outgoingTransition.getId() + "'";<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return message;<BR />&nbsp;&nbsp;&nbsp; }<BR /><BR />}<BR /><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE><BR /><SPAN>signal() method that uses the above command …..</SPAN><BR /><BR /><PRE class="language-none line-numbers"><CODE><BR />&nbsp;&nbsp;&nbsp; public void signal(ProcessEngine engine, String processInstanceId, String transitionName) {<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CommandExecutor commandExecutor =<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ((RuntimeServiceImpl) engine.getRuntimeService()).getCommandExecutor();<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; SignalViaNameCmd command = new SignalViaNameCmd(processInstanceId, transitionName, null);<BR />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; commandExecutor.execute(command);<BR />&nbsp;&nbsp;&nbsp; }<BR /><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN></CODE></PRE><BR /><SPAN>Brian </SPAN><BR /><BR /><SPAN>Brian Westrich</SPAN><BR /><SPAN><A class="jive-link-email-small" href="mailto:bw@mcwest.com" rel="nofollow noopener noreferrer">bw@mcwest.com</A></SPAN></BODY></HTML> Mon, 07 Nov 2011 19:58:21 GMT bwestrich 2011-11-07T19:58:21Z 'jBPM-like' state transitions https://connect.hyland.com/t5/alfresco-archive/jbpm-like-state-transitions/m-p/43443#M23688 Hello Activiti community, I'm trying to implement a "wait-state" model in Activiti, which I believe is done via the RuntimeService.signal() method and "receive" tasks. This approach chooses transitions based on the transition condition. Though this is standard BPMN2.0 behavior, I see a couple drawba Mon, 07 Nov 2011 19:58:21 GMT https://connect.hyland.com/t5/alfresco-archive/jbpm-like-state-transitions/m-p/43443#M23688 bwestrich 2011-11-07T19:58:21Z Re: 'jBPM-like' state transitions https://connect.hyland.com/t5/alfresco-archive/jbpm-like-state-transitions/m-p/43444#M23689 <HTML><HEAD></HEAD><BODY><SPAN>That would be useful , i haven't checked it but i will try it !</SPAN></BODY></HTML> Wed, 08 Feb 2012 12:14:00 GMT https://connect.hyland.com/t5/alfresco-archive/jbpm-like-state-transitions/m-p/43444#M23689 hamed 2012-02-08T12:14:00Z