[jbpm-issues] [JBoss JIRA] Closed: (JBPM-1183) Node/State don't provide any support for Conditions on Transitions

Node/State don't provide any support for Conditions on Transitions ------------------------------------------------------------------ Key: JBPM-1183 URL: http://jira.jboss.com/jira/browse/JBPM-1183 Project: JBoss jBPM Issue Type: Bug Components: Core Engine Affects Versions: jBPM jPDL 3.2.2 Reporter: Britt Miner Assigned To: Tom Baeyens Node and State don't provide any preliminary check for conditions provided on transitions. No check is performed until the transition is signaled, at which point the process will barf if the condition evaluates to false. Regardless if a person "should" be using transition conditions in Node or State, the schema allows it, the documentation doesn't forbid it, and the current behavior of a Transition element in the jpdl is inconsistent. The fix to make everything consistent is fairly simple--only org.jbpm.graph.def.Node needs to be altered: Add the following method: // BRITT-- public Transition calculateLeavingTransition(ExecutionContext executionContext) { Transition transition = null; boolean hasTransitioned = false; Iterator iter = leavingTransitions.iterator(); while (iter.hasNext()) { Transition candidate = (Transition) iter.next(); String conditionExpression = candidate.getCondition(); if (conditionExpression != null) { Object result = JbpmExpressionEvaluator.evaluate(conditionExpression, executionContext); if (Boolean.TRUE.equals(result)) { transition = candidate; } } else { transition = candidate; } } if (!hasTransitioned) { this.getDefaultLeavingTransition().removeConditionEnforcement(); log.warn("All transition conditions have evaluated to 'false'. Taking the default transition."); transition = this.getDefaultLeavingTransition(); } return transition; } // --BRITT ...and modify "leave(ExecutionContext executionContext)": // BRITT --replace the following line with the code below // to check conditions before selecting the transition to take... //leave(executionContext, getDefaultLeavingTransition()); //original line leave(executionContext, calculateLeavingTransition(executionContext)); // --BRITT For consistency, ProcessState should also have one line modified at the very end of it's "leave(ExecutionContext, Transition)" method: // BRITT-- rather than specify which transition, let the super class decide... //super.leave(executionContext, getDefaultLeavingTransition()); super.leave(executionContext, calculateLeavingTransition(executionContext)); // --BRITT