Programmer Think

1, Introduction to CATCAT (Central Application Tracking) is an open source distributed real-time monitoring system developed by meituan review based on Java. Meituan comment infrastructure department hopes to provide industry-leading and unified solutions in the fields of basic storage, high-performance communication, large-scale online access, ...

This problem was encountered years ago. On the first day of work after the year, I suddenly thought of the problem solved years ago when verifying other problems. I can't remember how to solve it at that time. I looked through the code and thought for a while before I remembered it. This is recorded here. The error logs counted are as follows: ...

Using distributed locks based on Redis is nothing new today. This article is mainly based on the accident analysis and solution caused by redis distributed lock in our actual project. The rush purchase orders in our project are solved by distributed locks. Once, the operation conducted a rush purchase activity of Feitian Maotai, with 100 bott ...

Write in front This is the core knowledge of http protocol. The knowledge involved includes the separation of front and rear ends, common http problems, distributed login solution JWT, etc. it can be used to review the treasure book of eight part essay and deepen the knowledge. It is recommended that you read it in the mode of breaking through ...

polymorphic Three characteristics of object-oriented: inheritance, encapsulation and polymorphism definition Polymorphism: refers to the same behavior, which has multiple different manifestations for different objects. Polymorphism in program: it refers to that the same method has different implementations for different objects Preconditions ...

RabbiteMq property 1. Why do you want to confirm the message? 2. What is the rabbitmq message confirmation mechanism? 3. How does the sender confirm that the message is sent successfully? What is a successful sending? 4. How does the consumer inform rabbitmq of the success or failure of consumption? reflection 1. Why do you want to co ...

1. Polymorphic introduction Meaning: method or object has many forms, which is the third feature of object-oriented. Polymorphism is based on encapsulation and inheritance; Business scenario: please write a program. There is a feed (feeding method) in the master class, which can complete the information of the director feeding animals; Trai ...

1, Table structure design, import and export templates. Note: the structure of blogger tree is 8-level structure, which is divided into two tables due to business relationship. This table is divided into four levels, and the structure is as follows: Building unit floor room Excel The table item name field is obtained from the first table ...

Buy settlement systemThe annual double 11 shopping carnival is coming, and it's time for the hand choppers to start performing. When we put the goods planted with grass for a long time into the shopping cart and click the "settlement" button, we come to the essential settlement page of buying. Let's create a virtual buy and buy settle ...

1. File upload In web development, there are usually file upload operations The common fileUpload component of Apache organization is used for file upload in general java web development When multipartfile object is used in spring MVC to accept uploaded files, the name of background parameters must be consistent with the name of the file sub ...