Explore the technical principles of EHCACHE Spring Annotations Core framework in the Java class library

EHCACHE Spring Annotations Core is an annotation -based framework for the cache function in the Java library.This article will explore the technical principles of the framework and provide some Java code examples. Introduction EHCACHE Spring Annotions Core is an open source Java class library that combines the EHCACHE and Spring framework to provide a simple way to use cache in the Java library.It uses the annotation function of the Spring framework to make the cache in the Java method very simple and flexible. 2. Technical principles The core principle of the EHCACACHE Spring Annotations Core is to use the Spring framework AOP (facing surface programming) function and annotation function.By using a specific annotation in the Java library, we can weave the cache logic into the call of the method. Specifically, EHCACHE SPRING Annitations Core provides the following annotations: 1. @cacheable: Prompt the results of the Spring framework. The result of this method should be cached.If the same parameter calls this method, Spring will return the result of the cache directly without the method body.This annotation is usually used to query or calculate the method of greater expenses. 2. @cacheevict: Prompt that the Spring framework clears the cache before or after the method is executed.When the method calls is completed, Spring will remove cache data related to this method.This annotation is usually used to update or delete cache data. 3. @caching: Allow multiple cache notes to the same method. By adding these annotations to the Java library and configured EHCACHE as a cache provider, we can get cache automatic management. Third, code example Below is a sample code that uses EHCACHE Spring Annotations Core: @Service public class UserService { @Cacheable(cacheNames = "users") public User getUserById(int id) { // Check the user from the database return userRepository.findById(id); } @CacheEvict(cacheNames = "users", allEntries = true) public void updateUser(User user) { // Update users userRepository.update(user); } } In the above examples, we used the note to mark the method of `@cacheable` to mark the method.This means that when the method is called for the first time, Spring will execute the method and store the result in the cache called "Users".After that, if the method is called again with the same parameter, Spring will directly obtain the results from the cache without performing the method again. In addition, we also used the method of `@cachevict` to mark the method of labeling` updateUser () `.This means that after the method call is completed, Spring will remove all the data in the cache called "Users". It should be noted that the above example code also needs to configure the EHCACHE cache provider.You can add a similar configuration to the configuration file of Spring: <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager"> <property name="cacheManager" ref="ehcache" /> </bean> <bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"> <property name="configLocation" value="classpath:ehcache.xml" /> </bean> In the above configuration, we designated a bean called "CacheManager", using EHCACHECACACHEMANAGER as a cache manager, and specified the position of the EHCACHE configuration file as "ClassPath: Ehcache.xml". Fourth, summary EHCACHE Spring Annotions Core is a convenient Java class library. By using Spring's annotations and AOP functions, adding a cache to the Java method is very simple.This article explores the technical principles of the framework and provides a sample code using EHCACHE Spring Annotations Core.Through reasonable configuration and use of these comments, we can easily manage and use cache to improve the performance and efficiency of the Java library.