fully synchronized MVELConditionEvaluator

MvelConstraint.java

   protected boolean evaluate(InternalFactHandle handle, InternalWorkingMemory workingMemory, Tuple tuple) {
        if (!jitted) {
            int jittingThreshold = TEST_JITTING ? 0 : workingMemory.getKnowledgeBase().getConfiguration().getJittingThreshold();
            if (conditionEvaluator == null) {
                if (jittingThreshold == 0 && !isDynamic) { // Only for test purposes or when jitting is enforced at first evaluation
                    synchronized (this) {
                        if (conditionEvaluator == null) {
                            conditionEvaluator = forceJitEvaluator(handle, workingMemory, tuple);
                        }
                    }
                } else {
                    synchronized (this) {
                        if (conditionEvaluator == null) {
                            conditionEvaluator = createMvelConditionEvaluator(workingMemory);
                        }
                    }
                }
            }

            if (jittingThreshold != 0 && !isDynamic && invocationCounter.getAndIncrement() == jittingThreshold) {
                jitEvaluator(handle, workingMemory, tuple);
            }
        }
        try {
            if (conditionEvaluator instanceof MVELConditionEvaluator) {
                synchronized (this) {
                    return conditionEvaluator.evaluate(handle, workingMemory, tuple);
                }
            } else {
                return conditionEvaluator.evaluate(handle, workingMemory, tuple);
            }
        } catch (Exception e) {
            throw new RuntimeException("Error evaluating constraint '" + expression + "' in " + evaluationContext, e);
        }
    }