I've been trying to work out how to use context functions and the Command
system, and need some suggestions/assistance.
I have a conversation-scoped Seam component "workflowProcessManager" in which I
have a list of running processes which is refreshed when the user clicks a
commandLink. In the same component I have a function to suspend a
ProcessInstance.
|
| @Name("workflowProcessManager")
| @Scope(ScopeType.CONVERSATION)
| public class WorkflowProcessManager {
|
| private JbpmContext context;
| private CommandServiceImpl csi;
| private Boolean showActiveOnly = true;
|
| @DataModel private List<ProcessDefinition> processDefinitions = new
Vector<ProcessDefinition>(0);
| @DataModelSelection("processDefinitions") @Out(required=false) private
ProcessDefinition currentProcessDefinition;
|
| @DataModel private List<ProcessInstance> runningProcesses = new
Vector<ProcessInstance>(0);
| @DataModelSelection("runningProcesses") @Out(required=false) private
ProcessInstance currentRunningProcess;
|
| public void init() {
| context = JbpmConfiguration.getInstance().createJbpmContext();
| populateProcessDefinitionList();
| csi = new CommandServiceImpl(context.getJbpmConfiguration());
| }
|
| public void showProcessesForProcessDefinition(ProcessDefinition pd) {
| GetProcessInstancesCommand gpic = new GetProcessInstancesCommand();
|
| if (this.showActiveOnly)
| gpic.setOnlyRunning(true);
| else
| gpic.setOnlyRunning(false);
| gpic.setProcessName(pd.getName());
|
| runningProcesses = (List<ProcessInstance>) csi.execute(gpic);
| System.out.println("ShowProcessesForProcessDefinition: runningProcesses
contains " + runningProcesses.size() + " entries.");
| }
|
| public void suspendProcessInstance(Integer id) {
| System.out.println("Suspending process instance " + id);
| ProcessInstance pi = context.getProcessInstance(id);
|
| pi.suspend();
|
| System.out.println("Saving process instance " + id);
| context.save(pi);
|
| //Session session = context.getSession();
| //session.flush();
|
| if (pi.isSuspended()) System.out.println("Process instance is suspended
= true");
| else System.out.println("Process instance is suspended = false");
|
| System.out.println("Refreshing processes for definition " +
this.currentProcessDefinition.getName());
| showProcessesForProcessDefinition(this.currentProcessDefinition);
|
| for (ProcessInstance p : this.runningProcesses) {
| if (p.isSuspended()) System.out.println("Process instance " +
p.getId() + " is suspended = true");
| else System.out.println("Process instance " + p.getId() + " is
suspended = false");
| }
| }
|
| public Boolean getShowActiveOnly() {
| return this.showActiveOnly;
| }
| public void setShowActiveOnly(Boolean showActiveOnly) {
| this.showActiveOnly = showActiveOnly;
| }
|
| @SuppressWarnings("unchecked")
| private void populateProcessDefinitionList() {
| processDefinitions =
context.getGraphSession().findAllProcessDefinitions();
| }
|
| }
|
And the guts of the page:
| <rich:panel>
| <f:facet name="header">Process List</f:facet>
|
| <h:panelGrid columns="2" columnClasses="twoColumnTopAligned">
| <h:panelGroup>
| <rich:dataTable value="#{processDefinitions}"
var="processDefinition"
|
onRowMouseOver="this.style.backgroundColor='#EAEAEA';this.style.cursor='pointer'"
|
onRowMouseOut="this.style.backgroundColor='#{a4jSkin.tableBackgroundColor}'">
| <rich:column>
| <f:facet
name="header">Process Name</f:facet>
| <h:outputText
value="#{processDefinition.name}"/>
| </rich:column>
|
| <rich:column>
| <f:facet
name="header">Description</f:facet>
| <h:outputText
value="#{processDefinition.description}"/>
| </rich:column>
|
| <a:support event="onRowClick"
reRender="instanceTable"
|
action="#{workflowProcessManager.showProcessesForProcessDefinition(processDefinition)}">
| </a:support>
| </rich:dataTable>
|
| <s:decorate id="showActiveOnlyField"
template="/layout/edit.xhtml">
| <ui:define name="label">Show
only active processes</ui:define>
| <h:selectBooleanCheckbox
id="showActiveOnly" value="#{workflowProcessManager.showActiveOnly}" />
| </s:decorate>
| </h:panelGroup>
|
| <rich:dataTable id="instanceTable"
value="#{runningProcesses}" var="processInstance">
| <rich:column>
| <f:facet
name="header">Id</f:facet>
| <h:outputText
value="#{processInstance.id}"/>
| </rich:column>
| <rich:column>
| <f:facet
name="header">Version</f:facet>
| <h:outputText
value="#{processInstance.version}"/>
| </rich:column>
|
| <rich:column>
| <f:facet
name="header">Status</f:facet>
| <h:outputText value="Finished"
rendered="#{processInstance.hasEnded()}"/>
| <h:outputText value="Paused"
rendered="#{processInstance.suspended}"/>
| <h:outputText value="Running"
rendered="#{!(processInstance.hasEnded() or processInstance.suspended)}"/>
| </rich:column>
|
| <rich:column>
| <f:facet name="header">Current
Node</f:facet>
| <h:outputText
value="#{processInstance.rootToken.name}"/>
| </rich:column>
|
| <rich:column>
| <f:facet
name="header">Actions</f:facet>
| <a:commandLink
id="pauseProcessInstance"
|
action="#{workflowProcessManager.suspendProcessInstance(processInstance.id)}"
| reRender="instanceTable"
| value="Pause">
| <s:conversationId />
| </a:commandLink>
| #{' '}
| <a:commandLink
id="resumeProcessInstance"
|
action="#{workflowProcessManager.resumeProcessInstance(processInstance.id)}"
| reRender="instanceTable"
| value="Restart">
| <s:conversationId />
| </a:commandLink>
| #{' '}
| <a:commandLink
id="signalProcessInstances"
|
action="#{workflowProcessManager.signalProcessInstance(processInstance.id)}"
| reRender="instanceTable"
| value="Signal">
| <s:conversationId />
| </a:commandLink>
| </rich:column>
| </rich:dataTable>
|
| </h:panelGrid>
|
| </rich:panel>
|
The problem I experience is that the list of running ProcessInstances is not
refreshed correctly, unless I add in the hibernate session flush() (commented
out in the code above).
The command service starts up a separate JbpmContext, which I believe is not
seeing the results of the suspend() call, and so refreshes the .
Should I be looking for a problem somewhere in the configuration, and if so
where? Or am I using the Jbpm features incorrectly somehow? Or do I need to
manually flush like this?
Any pointers from more experienced people will be much appreciated...
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