void onOverflow(final int point) {
        if (Boolean.FALSE == overflowed) {
            if (overflowListener != null) {
                overflowListener.fireOverflow(point);
            }
            // Make sure it runs only once per CallStack.
            overflowed = true;
        }
    }
@author netspider
@author Woonduk Kang(emeroad)
@author jaehong.kim
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/context/DefaultCallStack.java