Detailed explanation of the technical principles and implementation methods of hot-redis library

Hot-Redis is a REDIS-based Java class library that is used to expand the function of monitoring and automated operations on Redis.It collects the monitoring index data of Redis and performs corresponding operations according to the preset rules to achieve dynamic management and optimization of Redis. The basic principle of Hot-Redis is to interact with Redis instances through the commands and event interface provided by Redis and collect monitoring data.It uses the INFO command of the Redis to obtain the status information of the Redis server, including memory usage, client connection, key value pairing, command execution, etc.At the same time, Hot-Redis subscribe to Redis events through the SubScriple command, such as the key expiration event and key to delete events, and custom events. In Hot-Redis, users can set different rules to define monitoring indicators and corresponding operations by configure files.For example, users can define a rule. When Redis memory occupies exceeding the threshold, the cache cleaning operation is performed; or a rule is defined, and a business logic code is executed when a key is deleted.These rules can be configured and expanded as needed to meet the needs in different scenarios. The implementation method of hot-redis mainly involves the following aspects: 1. Connect to the Redis server: Hot-Redis establishs a connection with the Redis server through the Java's JEDIS library, and sends commands and obtain monitoring data through this connection. Jedis jedis = new Jedis("localhost", 6379); 2. Collect monitoring data: Hot-Redis can obtain Redis monitoring data regularly or real time by timing task or event monitoring, and store them in memory for processing and analysis. String info = jedis.info(); 3. Analyze the monitoring data: Hot-Redis parses the monitoring data of Redis into an operable format, and is processed accordingly according to the rules of the configuration. Map<String, String> data = parseInfo(info); 4. Trigger operation: Hot-Redis triggers the corresponding operation according to the analysis results of the rules and monitoring data.It can be executed by Redis command, calling business logic code or sending notifications. if (data.get("used_memory") > threshold) { jedis.evict(keys); Sendnotification ("Redis memory use exceeds the threshold, execute cache cleaning operation"); } 5. Configuration and extension: Hot-Redis provides configuration files to define monitoring rules and operations. Users can configure and expand according to their own needs.Configuration files can include monitoring indicators, rules definition, operation methods, etc. In short, Hot-Redis is to interact and monitor the monitoring data of Redis through interaction and monitoring with the Redis server, and perform corresponding operations according to the preset rules to achieve dynamic management and optimization of Redis.It has flexible configuration and scalability and can meet the needs of different scenarios.By using Hot-Redis, developers can better understand and manage the operating status of Redis, and improve the performance and reliability of Redis.