Explore the technical principles of the cache framework in the Java library

Technical principles of the caffeine cache framework in the Java class library When developing Java applications, using cache will be a good choice to improve performance and response speed.The cache frame of the Java library provides us with a flexible and efficient cache solution.Caffeine cache is provided by the Google GUAVA library, which provides a powerful cache implementation suitable for a variety of scenes. The principle behind the cache cache framework is very simple. It mainly contains two core components: storage engine and cache strategy. 1. Storage engine: The caffeine cache uses memory as the default storage engine.This means that all cache items are stored in the heap memory of JVM, which can provide very fast read and write access.In addition, caffeine cache also provides other optional storage engines, such as disks and databases to facilitate processing larger cache data. 2. Cache strategy: Caffeine cache uses the LRU (recently used) algorithm as the default cache strategy.LRU algorithm -based data access mode, when the cache space is insufficient, remove the most recent cache items from the cache.In addition to LRU, caffeine caching also provides other commonly used cache strategies, such as FIFO (advanced first) and fixed size. The following is a simple example of using cacharal cache frame: import com.google.common.cache.Cache; import com.google.common.cache.CacheBuilder; import java.util.concurrent.TimeUnit; public class CaffeineCacheExample { public static void main(String[] args) { // Create a cache instance Cache<String, String> cache = CacheBuilder.newBuilder() .maximumSize(100) .expireAfterWrite(10, TimeUnit.MINUTES) .build(); // Put a key value on the cache cache.put("key1", "value1"); // Get a value from the cache String value = cache.getIfPresent("key1"); System.out.println (value); // Output: Value1 // Delete a value from the cache cache.invalidate("key1"); value = cache.getIfPresent("key1"); System.out.println (value); // Output: null } } In this example, we use the `Cachebuilder` class to create a cache cache instance.We set up a cache maximum capacity of 100 and the expiration time of the cache item is 10 minutes.Then, we put a key value into the cache through the `put` method, obtain the value from the cache through the` GetifPretention` method, and delete the value from the cache through the `Invalidate` method. To sum up, the cache framework in the Java library uses a combination of storage engine and cache strategy to provide an efficient and easy -to -use cache solution.By reasonably configure the storage engine and cache strategy, we can improve performance according to the requirements of the application and reduce the frequency of access to the underlying data source.