Workflow management system - Software Development Case Studies in Java - page 602

The activities are represented by the WfActivityImpl class that implements
the WfActivity interface. The constructor has the main task of assigning the
activity to some workflow participant.
package WfEngine;
...
class WfActivityImpl
extends ExecutionObjectImpl
implements WfActivity {
WfProcess process;
WfActivityDefinition definition;
Vector workItems # new Vector();
Vector context # new Vector();
static private long uniqueId # 1;
static private String getId(){
return Long.toString(uniqueId !! );
}
public WfActivityImpl(WfProcess proc,
WfActivityDefinition def) {
super(def.getName());
process # proc;
definition # def;
try {
set_description(def.getDescription());
set_key(getId());
} catch (Exception e){ }
// set up activity assignments
WfParticipant performer # def.getPerformer();
Actor actor # Organization.match(performer.getName());
WfAssignmentImpl workItem # new WfAssignmentImpl
( this ,actor);
workItems.add(workItem);
actor.addWorkItem(workItem);
}
public void complete() throws BaseException,
CannotComplete {
if (state.workflow_state() ## workflow_stateType.open &&
state.while_open() ## while_openType.running){
change_state(workflow_stateType.closed, null , null ,
how_closedType.completed);
history.add( new WfEventAuditImpl( this ,"Completed"));
((WfProcessImpl)process).completed( this );
} else { throw new WorkflowModel.CannotComplete(); }
}
...
}