The technical principles of the Spring Cache framework in the Java class library detailed explanation

The Spring Cache framework is a powerful cache solution provided by the Spring framework.It can help us easily integrate the cache mechanism into our applications and provide flexible configuration options and rich cache management functions.This article will introduce the technical principles of the Spring Cache framework in the Java class library in detail, and provide some Java code examples. 1 Introduction Spring Cache framework is a key module in Spring Framework. It uses standard Java annotations, such as@cacheable,@cachevict and @cachepput to add cache function between method calls.By using these annotations, we can easily cache the return value of the method, and use the cache result directly in subsequent calls without the need to execute the method logic again. 2. Core concept -CacheManager: Responsible for the creation, configuration and destruction of the management of the cache.Spring Cache framework supports a variety of types of cache managers, such as EHCACHE, Redis, Guava, etc. -Cache: represents a specific cache instance, responsible for actual cache read, writing, and deleting operations. -Ache Anotation: The annotation of the method is used to declare that the method needs to be cached. 3. How to use 3.1 Note configuration We can declare the return value of the method by adding @cacheable annotations to the method.For example: @Cacheable(value = "books", key = "#isbn") public Book getBookByIsbn(String isbn) { // Get the logic of book information from the database or other data sources } In the above code, when the GetbookByisbn method is called, if there is already an ISBN as the key in the cache, the cache result is directly returned; otherwise, the logic of the execution method and add the return value to the cache. 3.2 cache refresh If we want to refresh the cache after the method is executed, we can use @cacheevict annotations.For example: @CacheEvict(value = "books", key = "#isbn") public void deleteBookByIsbn(String isbn) { // Delete the logic of book information from the database or other data sources } In the above code, when the deleteBookbyisbn method is called, the logic of the method will be performed first, and then the entrance is deleted in the cache. 3.3 Cache update If we want to update the cache after each method call, we can use @cachepput annotation.For example: @CachePut(value = "books", key = "#book.isbn") public Book saveBook(Book book) { // Save the book information to the logic of the database or other data sources return book; } In the above code, when the SaveBook method is called, the return value (book information) will be added to the cache, and Book.isbn will be used as key. 4. Analysis of cache annotation parameters -Value: Specify the name of the cache.Specific configuration can be performed in the configuration file. -key: specify the cache key.You can use the Spring El expression to dynamically calculate the value of the key. -Condition: Specify the conditions for the cache to take effect.You can use the Spring El expression to define the logic of the condition. 5. Cache configuration We can manage and configure cache through configuring cachemanager and cache instances in Spring configuration files.The following is the configuration code of an example: <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"> <property name="configLocation" value="classpath:ehcache.xml" /> </bean> In the above example, we use EHCACHE as a cache manager to load the EHCACHE.XML configuration file by specifying the configLocation property. 6. Interceptor mechanism The Spring Cache framework uses AOP and dynamic agency mechanisms to intercept before the method calls, and determines whether the method has been cached.If you have been cached, return the cache result directly; otherwise, the logic of the execution method and add the return value to the cache.This mechanism enables us to easily integrate the cache function into the application without modifying the existing code. In summary, the technical principles of the Spring Cache framework in the Java library mainly involve cache managers, cache operators, cache annotations, and interceptors.By using the caching solution, we can flexibly configure the cache rules and conditions, and configure the cache management and configuration through configuring the cache manager and cache instance.This framework is simple, but it provides a powerful cache function, which can significantly improve the performance and response speed of the application.