Cache2k core implementation of the cache refresh strategy in the framework

Cache2k is a high -performance Java cache library that provides rich features to accelerate the performance of the application.One of the core features is the cache refresh strategy, which can ensure that the data in the cache is updated in a timely manner so that the application can get the latest data when needed. In cache2k, the cache refresh strategy is achieved by implementing the cacheLoader interface.The Cacheloader interface defines a load method, which is called when the cache is not hit to obtain the latest data from the data source.In this way, when the data in the cache expires or invalid, cache2k will automatically trigger the process of cache refresh. The following is a simple example, showing how to achieve cache refresh strategy in cache2k: First, we need to implement the Cacheloader interface and implement the load method.The following is an example implementation: public class MyCacheLoader implements CacheLoader<String, String> { @Override public String load(String key) throws Exception { // Get the logical code of the latest data from the data source // Here is the logic of obtaining data from the database, network or other sources // Return to the latest data return fetchDataFromDataSource(key); } private String fetchDataFromDataSource(String key) { // Implement the logic of obtaining data from the data source // Return to obtain data return "Data for key: " + key; } } Then, where we use cache2k, we can create a Cache object and pass the Cacheloader we implemented to it.The following is an example: public class CacheExample { public static void main(String[] args) { // Create a cache object, the specified cache size is 100, and the expiration time is 1 hour Cache<String, String> cache = CacheBuilder.newBuilder(String.class, String.class) .name("myCache") .expireAfterWrite(1, TimeUnit.HOURS) .loader(new MyCacheLoader()) .build(); // Obtain data from the cache String data = cache.get("key"); System.out.println("Data from cache: " + data); } } In the above example, when there is no "key" corresponding data in the cache, cache2k calls the load method of MyCacheloader to get the latest data and store it into the cache.Then, we obtain data from the cache through the cache.get method. By achieving the Cacheloader interface, we can customize the altitude refresh strategy to meet the specific needs of the application.Cache2k will automatically processes the expiration and invalid cache, and ensure that the application can always get the latest data.This makes Cache2k a powerful tool to improve the performance and response speed of the Java application.