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3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.剩下一个大爷，大概年纪大了，不敢跟年轻人比，虽然眼馋，到底不敢下水，见玉米抓起一串珍珠就要往水里砸，忙哆嗦道：小……哥，不，小爷，你要是嫌弃这个，送给我老汉可好？说完，盯着那串珠子，眼子都不转了。他只得闭目调息，静待心情平复。Attackers use the controlled host to send a large number of PSH and ACK packets to the target, and the target will consume a large amount of system resources to continuously empty the receiving buffer, resulting in the failure to process the data normally.When an attack occurs: clean traffic and filter attack packets.