archaius-core/src/main/java/com/netflix/config/ConcurrentMapConfiguration.java
@Override
    public void clear()
    {
        fireEvent(EVENT_CLEAR, null, null, true);
        map.clear();
        fireEvent(EVENT_CLEAR, null, null, false);
    }
@Override
    public void clear()
    {
        fireEvent(EVENT_CLEAR, null, null, true);
        map.clear();
        fireEvent(EVENT_CLEAR, null, null, false);
    }
Clear the map and fire corresonding events.