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The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.MainReactor----a NioEventLoop in bossGroup (NioEventLoopGroup)　　FBI获悉有一伙恐怖分子准备在美国小姐选美时制造恐怖袭击，为挫败这次阴谋，FBI决定派卧底参加选美。任务自然落到了格雷西身上。经过造型师的巧手，格雷西令所有人都眼前一亮，她的“假小子”性格自然也令到这次任务笑料百出。西安事变前夕，红军到达陕北，蒋介石欲将西安作为陪都考虑，西安一时成为全国的焦点城市，是中统、军统、中共、日本人、中央军、东北军、西北军各方情报特工人员争夺的前沿。为夺取解放胜利，共产党地下人员武仲明以孪生哥哥武伯英身份潜入西安。 武仲明刚到西安，便面临一场生死考验。办公室的新派女性黄秀玉对其疯狂示爱。而一直追求黄秀玉的特务科长胡汉良处处为难武仲明。更令武仲明意想不到的是，已经与哥哥离异的嫂子沈兰，竟然回到西安寻夫。特务头子齐北以联络官的身份赴西安党调处就职。危急关头，武仲明在沈兰和组织的帮助下，将危险一一化解，送出情报。23. Chain of responsibility model