This sample is an excerpt from arbitrary cycle of the workflow patterns:
| <process-definition name="arbitrary-cycle">
|
| <start-state name="A">
| <transition to="B"/>
| </start-state>
|
| <state name="B">
| <timer duedate="20 seconds" transition="C">
| <script>print( "Your 20 seconds is up. Just letting you know I will
go to C now" );</script>
| </timer>
| <transition name="C" to="C">
| </state>
|
| <state name="C">
| <event type="node-enter">
| <action class="DoAsyncStuff"/>
| </event>
| <transition name="fail" to="B"/>
| <transition name="pass" to="E"/>
| </state>
|
| <end-state name="E"/>
|
| </process-definition>
|
This is the main execution part. Executed only once.
| JbpmContext ctx = config.createJbpmContext();
| try {
| ProcessInstance proc = ctx.newProcessInstance( "arbitrary-cycle" );
| proc.signal();
| ctx.save(proc);
| }
| catch(Exception ex)
| {
| ctx.setRollbackOnly();
| throw ex;
| }
| finally
| {
| ctx.close();
| }
|
In the EventListenerThread example from my previous code
| public void run() {
| //this class executes a long running process. It returns a status
| boolean pass = ALongRunningProcess.execute();
|
| JbpmContext ctx = config.createJbpmContext();
| try {
| ProcessInstance proc = ctx.newProcessInstance(
"arbitrary-cycle" );
| if( !pass )
| proc.signal("fail");
| else
| proc.signal("pass");
| ctx.save(proc);
| }
| catch(Exception ex)
| {
| ctx.setRollbackOnly();
| throw ex;
| }
| finally
| {
| ctx.close();
| }
| }
|
Take note: Running threads has some issues in a J2ee environment, also this
will not run if you restart the server. But thats another story. So this
example is just used to illustrate a point. In fact you can accomplish
something similar using timers instead. Hope this is clear.
Regards,
Elmo
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