Programming VIP

1, Antecedents There is a core project of the company. The client of redis has always used jedis. Later, the technical director asked to replace the jedis client with a more efficient lettuce client, and use the RedisTemplate class of spring framework to operate redis. However, the world is unpredictable. It is such a simple demand that makes ...

setup () Setup () is a vue3 newly added component. Vue3 adopts the composite API. In order to use the composite API, we need an entry, which is called setup in the vue3 component. (to put it simply, do not use the data, method and calculated in vue2. All data and methods are written in setup.) Let's take a simple example: <template> ...

1, Basic version (including basic operation) This is the most common way of writing in our work RedisUtil: encapsulated Redis related API operationsRedisKeyPreConst: the key prefix involved in Redis cacheUserMapper: operation database The code implementation details are as follows: public class UserServiceImpl implements Use ...

https://blog.didispace.com/spring-boot-learning-1x/ 1. Unified exception handling of application Spring Boot provides a default mapping: / error. When an exception is thrown during processing, it will be transferred to the request for processing, and the request has a global error page to display the exception content. Access a nonexistent U ...

Multithreading tutorial (32) ThreadPoolExecutor 1. Thread pool status ThreadPoolExecutor uses the upper 3 bits of int to indicate the thread pool status and the lower 29 bits to indicate the number of threads Status nameHigh 3 bitsReceive new tasksProcessing blocking queue tasksexplainRUNNING111YYSHUTDOWN000NYNew tasks are not received, bu ...

1, First, look at several circular dependencies 1. Constructor injection loop dependency @Service public class A { public A(B b) { } } @Service public class B { public B(A a) { } } 2. singleton pattern field property or setter injection cyclic dependency @Service public class A { @Autowired private B b; } @Service ...

catalogue Redis redis application scenario Install compile & & start redis storage structure Five data structures of Redis string string basic command string storage structure Application of string data type in redis list list basic command list storage structure list application hsah Basic command storage struct ...

1.Redis cache double write consistency2. Several update strategies for database and cache consistency2.1 update the database first and then the cache2.2 delete the cache first and then update the database2.3 update the database first and then delete the cache2.4 update the cache first, and then update the database3. canal of the implementation ...

Glide's cache is divided into two modules, one is memory cache and the other is hard disk cache. The function of memory cache is to prevent duplicate data from being read; The function of hard disk cache is to prevent applications from repeatedly downloading and reading data from the network or other places. Cache Key of Glide The code that ...

1, Important tags in xml 1.1. where label Query criteria entity class public class QueryTeamVO { private String name; private Date beginTime; private Date endTime; private String location; public QueryTeamVO() { } public QueryTeamVO(String name, Date beginTime, Date endTime, String location) { this.n ...