Programmer Think

The last tweet briefly introduced the interaction with maps, such as moving, zooming, clicking, screenshots and other functions, which are very common businesses. Next, let's learn how to dot, mark information, draw lines and surfaces on the map. Mark points, draw lines, faces, and add prompt information In fact, the function of drawing point ...

The flow of CAS operations described above is not difficult. But the above instructions are not enough. Next, I will introduce a little more background knowledge. With this background knowledge, we can better understand the following content. 2. Background introduction As we all know, the CPU transmits data through bus and memory. In a mult ...

How to reduce the coupling and improve the adaptability of the code? It is implemented through the interface, but if the interface needs to use the new keyword, the coupling problem will occur again for instance: /** /** * @ClassName: TestReflection * @Model : (Module name) * @Description: Use reflection to reduce coupling (through inte ...

The leaf segment mode is an optimization to directly use the self increment ID of the database as the distributed ID to reduce the frequency of database operation. It is equivalent to obtaining self incrementing IDs from the database in batches. One number segment range is taken out from the database each time. For example, (11000] represents 1 ...

This paper mainly introduces the design of redis high availability scheme using official sentinel. Redis Sentinel Sentinel introduction Sentinel is a highly available solution officially provided by redis for clusters. In actual projects, sentinel can be used for automatic redis failover to reduce the workload of manual intervention. In a ...

2, Binary tree 1. Definition of binary tree A binary tree is a tree structure in which each node has at most two subtrees. It has five basic forms: binary tree can be an empty set; The root can have an empty left subtree or right subtree; Or the left and right subtrees are empty. 2. Properties of binary tree Property 1: the maximum number ...