@Override
    public T newInstance() {
        if (isOverflow()) {
            return factory.disableInstance();
        } else {
            return factory.newInstance();
        }
    }
@author netspider
@author Woonduk Kang(emeroad)
@author jaehong.kim
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/context/DefaultCallStack.java