Research On the Technical Principles of JSR107 API Framework in JSR107 API and SPI framework

Research on the technical principles of JSR107 API and SPI framework in the Java class library Summary: JSR107 is the abbreviation of the Java specification request (JSR) 107. It defines a set of API and SPI frameworks used to operate the cache Java object cache.This article will focus on the technical principles of the JSR107 API and SPI framework, as well as providing some Java code examples to help readers better understand. introduction: As the application scale and data volume continues to increase, cache has become one of the key technologies in many Java applications.The emergence of the JSR107 API provides a standardized management and operation cache method for Java programmers, and the SPI framework provides a flexible mechanism for the integration and expansion between different cache providers. 1. Overview of JSR107 API: The JSR107 API provides a set of APIs for Java programmers.Through these APIs, we can create, manage, store and retrieve objects in cache.Here are some commonly used JSR107 API interfaces: 1. CachingProvider: It represents the entire cache provider and provides the ability to create and access CacheManager. 2. CacheManager: Factory categories used to create and manage cache instances. 3. Cache: It represents the actual cache instance, which can store and retrieve objects. 4. ENTRY: It means a entry in the cache, consisting of key values. Through the JSR107 API, we can easily use cache in the application to improve performance and response speed. Second, SPI framework overview: SPI (Service Provider Interface) is a mechanism in Java to allow applications to select a provider from a set of insertable implementation.JSR107 uses the SPI framework to allow different cache providers to integrate and expand. In JSR107, the following SPI interfaces and classes are mainly involved: 1. CachingProvider: The cache provider needs to implement this interface and provide basic cache management functions. 2. CacheManagerFactory: The cache provider is implemented to create and manage the CacheManager instance. 3. CacheManager: The cache provider needs to implement this interface to provide the function of creating and managing cache. Through the SPI mechanism, we can select and configure different cache providers according to actual needs, and flexibly switch and expand the cache function in the application. Third, the technical principle of JSR107 API: The technical principles of JSR107 API mainly include the following aspects: 1. Cache management: JSR107 API provides the creation and management of cache instance through the Cachemanager interface.You can obtain, create and delete the Cache instance through cacheManager.Through this interface, we can manage different caches in the application. Example code: // Use the default cache provider to create cacheManager CachingProvider cachingProvider = Caching.getCachingProvider(); CacheManager cacheManager = cachingProvider.getCacheManager(); // Create or get cache instance Cache<String, Object> cache = cacheManager.getCache("myCache"); 2. Calling operation: JSR107 API provides a set of operation cache methods.We can use these methods to store, retrieve and delete the objects in the cache. Example code: // Put the data into the cache cache.put("key", "value"); // Obtain data from the cache String value = cache.get("key"); // Delete data from the cache cache.remove("key"); 4. Technical principles of SPI framework: The technical principles of the SPI framework mainly include the following aspects: 1. Interface definition: JSR107 is standardized by defining a set of interfaces.The cache provider needs to implement these interfaces and provide specific implementation according to its own characteristics. Example code: as mentioned earlier, CachingProvider, CacheManager and other interfaces. 2. Service discovery: The SPI framework uses Java's ServiceLoader mechanism to discover and load specific cache providers.Through the ServiceLoader, the application can dynamically load and use a specific cache provider. Example code: // Load the cache provider ServiceLoader<CachingProvider> serviceLoader = ServiceLoader.load(CachingProvider.class); // Get the first cache provider CachingProvider cachingProvider = serviceLoader.iterator().next(); 3. Extension point: The SPI framework provides some extensions that allow cache providers to perform functional extensions without modifying the API.Through these extensions, we can customize the behavior of the provider. Example code: // Create a customized CachingProvider implementation public class MyCachingProvider implements CachingProvider { // The method of implementing the CachingProvider interface ... } in conclusion: This article focuses on the technical principles of the JSR107 API and SPI framework in the Java class library.The JSR107 API provides a standardized interface for operation cache, and the SPI framework allows different cache providers to integrate and expand.By understanding the JSR107 API and SPI framework, we can better use and expand the cache function in Java. Reference materials: 1. JSR107 specification: https://jcp.org/en/jsr/detail? ID = 107 2. JSR107 official document: https://github.com/jsr107/jsr107Spec