public B addMasterChangeListener(MasterChangeListener masterChangeListener) {
        if (masterChangeListener != null) {
            if (masterChangeListeners == null) {
                masterChangeListeners = new ArrayList<MasterChangeListener>();
            }
            masterChangeListeners.add(masterChangeListener);
        }
        return (B) this;
    }
@author Robert HG (254963746@qq.com) on 4/21/16.
lts-core/src/main/java/com/github/ltsopensource/core/cluster/AbstractNodeBuilder.java