EHCACHE Spring Annotations Core framework technical principles and application analysis
EHCACHE Spring Annotations Core framework technical principles and application analysis
EHCACHE is an open source Java cache library that can be used to improve the performance and scalability of applications.It provides a simple and easy -to -use way to store and obtain data, reduce the frequency of access to databases or other external resources, and significantly improves the response speed of the application.
Spring Annotations Core is an integrated component of the EHCACHE and Spring framework.It allows developers to use simple annotations to configure and manage cache without writing additional code.
The working principle of EHCACHE Spring Annotations Core is as follows:
1. Configuration cache manager: In Spring configuration file, developers need to configure a cache manager.You can use the default cache manager provided by EHCACHE, or you can customize one.
@Autowired
private CacheManager cacheManager;
2. Note Cache Method: Add annotations to the way to cache.EHCACHE provides multiple annotations, such as@cacheable,@cachepput,@cacheevict, etc.
@Cacheable(value = "usersCache", key = "#id")
public User getUserById(String id) {
// Obtain user data from the database or other external resources
}
3. Use the cache: When the method is called, EHCACHE will automatically check whether the data required in the cache.If you exist, return the data in the cache directly; if it does not exist, the call method is used to obtain the data and stores it into the cache.
User user = getUserById("123");
4. Update cache: When new data needs to be stored or existing data needs to be updated, use the @CachePut annotation to update the cache.In this way, the latest data will be obtained next time the method of calling is called.
@CachePut(value = "usersCache", key = "#user.id")
public User saveUser(User user) {
// Save user data to database or other external resources
}
5. Clear the cache: Use @cacheevict annotations to clear the data in the cache.You can specify to remove the entire cache or certain cache items.
@CacheEvict(value = "usersCache", key = "#id")
public void deleteUserById(String id) {
// Delete user data from the database or other external resources
}
The application scenarios of EHCACACHE Spring Annotations Core mainly include:
1. Database query cache: In the application that needs to be frequently querying the database, using the cache can greatly improve the query performance and reduce the visits of the database.
2. Business data cache: In some business scenarios, some static or unwanted data can slowly exist in the application to avoid repeated calculations or frequently call external resources.
3. Distributed cache: EHCACHE can be integrated into distributed applications to achieve cache sharing between multiple applications, and improve the performance and stability of the entire system.
Summary: EHCACHE Spring Annotations Core is a powerful cache framework, which makes the use of cache make the use of cache more simple and flexible.Through annotations, developers can easily configure and manage cache to improve the performance and scalability of applications.
Please note: In order to achieve the above example code, please correctly configure the EHCACHE cache manager and the corresponding annotation scanner in the Spring configuration file.At the same time, ensure the correct introduction of EHCACHHHHHHE and Spring Annotations Core.
