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3. The last is to publish the message. The publisher traverses the cache list and triggers the subscriber callback function stored in it in turn.公元前139年，张骞率领百余人组成的使团出使西域，中途遭匈奴截杀，张骞与向导堂邑父沦为阶下囚，被困于匈奴十年之久。这日，张骞与堂邑父正照常奉命测绘地图，却不料偶遇大汉斥候耿乐。两军交战，耿乐被俘，误会张骞已经叛变。张骞与同伴的出逃计划因此被打乱……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.Article 4 [Government Responsibility] The State shall strictly supervise the use of medical security funds."Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.如今我委身于此，只求船主书信一封。In terms of hero strengthening, hero reincarnation has the most attributes.