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The factory class mode provides a mode to create a single class, while the builder mode is to centralize and manage various products to create composite objects. The so-called composite objects refer to a class with different attributes. In fact, the builder mode is obtained by combining the previous abstract factory mode with the final Test. Let's look at the code:Sentinel (Sentinel) process is used to monitor the working status of Master master server in redis cluster. When Master master server fails, it can switch between Master and Slave servers to ensure high availability of the system. It has been integrated into redis2.6 + version, and Redis Sentinel mode has stabilized after version 2.8. In general, it is also recommended to use later versions of Redis version 2.8 in production environment. Sentinel is a distributed system. You can run multiple sentinel processes in one architecture. These processes use gossip protocols to receive information about whether the Master master server is offline, and use Agreement Protocols to decide whether to perform automatic failover and which Slave to select as the new Master. Each Sentinel process will send messages to other Sentinel, Master and Slave regularly to confirm whether the other party is "alive". If it is found that the other party has not received a response within the specified configuration time (configurable), it will temporarily think that the other party has dropped, which is called "Subjective Down". English name: Subjective Down, SDOWN for short. Subjective Down,这是所有了解那段史的人的心声。幼儿国学课堂《论语》原文讲解：国学启蒙智慧、国学启迪梦想、国学早教益智，让幼儿有一个智慧的童年。一九七四年，时年十八岁的河北定县实习演员石小青和十九岁的北京知青刘胜利被部队宣传队选中。在火车即将发车之际，小青被叫下车，从此一对鸳鸯被拆开。县秘书李志高在小青酒醉后占有并使她怀了孕，万般无奈的她把女儿遗弃，自己两次自杀被人救起。胜利对发生的一切一无所知，两人多次擦肩而过。二十年春秋，小青有了自己的事业，饱受内心谴责的李志高终于找到了救赎的机会，驾车去向小青坦白的途中遇车祸身亡。离散二十年，胜利放弃了战友美娟和同事沈虹的频频示爱，经过一番周折，找到了小青的女儿。小青终于看见了自己的女儿，也看见了对自己矢志不渝的胜利。Many years ago, there was a product form called community + e-commerce. In my opinion, it is too difficult to do this fact well. It is already very difficult for communities or e-commerce companies to do a good job in one category. You can imagine this difficulty if you want to mix these two things together and do a good job.正阳掌门金虚真人号令武林，抓捕苏云落。左卿辞为救苏云落，不惜身陷江湖风波。此时危机频发，侯府满门遭到权臣威宁侯陷害，左卿辞不得不卷入家国乱局。苏云落与之一同抽丝剥茧，翻出一段江湖秘史，更由此牵连出一段十年前的朝堂真相。