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Application Scenario 2: Virtual Agent is to create expensive objects as needed. It is used to store real objects that take a long time to instantiate. For example, for large HTML Web pages, picture frames replace real pictures through virtual agents.他并不知道，总有人逆流而上，用气骨点亮一个时代，当这个人骨头硬到一定程度，不管是贪官污吏还是皇亲国戚，不管是金银美女还是大刀火炮，都无法将其摧毁，只会令其愈发闪耀。　　《灵动：鬼影实录》的第一部在全球收获了1.93亿美元的票房，成本却只有低得令人难以置信的1.5万美元。第二部成本上升至300万美元，虽然票房没有等比上升，但目前也已经达到了非常不错的1.56亿美元。在制片方的眼中，《灵动：鬼影实录》是电影史上性价比最前世因为帝尊陷害而身死，重生到了高中时代，恰逢灵气复苏，天地巨变。再生少年时，重走修行路，这一世，他当守护自己的朋友、亲人，他当不留遗憾，他当一路横推，他当诸天无敌，万古为尊！牧师威尔·达文波特（WillDavenport）将幸福的夫妇团结在神圣的婚姻中，侦探督察乔治·基廷（GeorgieKeating）一如既往地忙于调查一系列当地谋杀案。随着新的十年即将到来，每个人都在思考未来的问题，不仅仅是威尔，但在50年代进入摇摆不定的60年代之前，有一些罪行需要解决，还有一些改变生活的决定需要做出，这些决定可能会永远改变格兰切斯特的生活。FlyWeightFactory is responsible for creating and managing meta-units. When a client requests, the factory needs to check whether there are eligible objects in the current object pool. If so, it returns the existing object. If not, it creates a new object. FlyWeight is a superclass. When it comes to shared pools, It is easy to think of JDBC connection pooling in Java, Considering the characteristics of each connection, It is not difficult for us to sum up: Applies to several objects that are shared, They have some common attributes, Take the database connection pool as an example, url, driverClassName, username, password and dbname, these attributes are the same for each connection, so it is suitable to use the meta-sharing mode to process, build a factory class, take the above similar attributes as internal data and the others as external data, and pass them in as parameters when calling methods, thus saving space and reducing the number of instances.LINUX: Linux uses the variable tcp_max_syn_backlog to define the maximum half number of connections that the backlog queue can hold. In Redhat 7.3, the value of this variable defaults to 256, which is far from enough. A low-intensity SYN attack can fill up the half-connection queue. We can modify the value of this variable with the following command: