Interpretation of the technical principles of the cache framework in the java class library

Caffeine cache framework is a common cache management tool that is widely used in the Java class library.It effectively manage cache data to improve system performance and response speed.In this article, we will deeply explore the technical principles of the cache cache framework and provide some Java code examples. The core principle of caffine cache framework is based on a data structure called "cache".It is a temporary storage area stored in memory for data that is often used.When the application needs to access a certain data, it will first try to get it from the cache.If the data already exists in the cache, it can be returned directly without the need to perform expensive calculations or access to external resources.This can greatly reduce the load and response time of the system. The caffine cache framework uses a strategy called "Least Recently Use (LRU) to manage the cache.According to the LRU strategy, when the cache space is full, the caffeine cache framework will automatically delete the latest data recently used, thinking that the new data is free of space.In this way, commonly used data can be retained in the cache, and data that is not commonly used will be eliminated. Below is a simple Java code example using the cache cache frame: import com.github.benmanes.caffeine.cache.Cache; import com.github.benmanes.caffeine.cache.Caffeine; public class CaffeineCacheExample { public static void main(String[] args) { // Create a cache object Cache<String, String> cache = Caffeine.newBuilder() .maximumsize (100) // Set the maximum cache capacity .build(); // Put the data into the cache cache.put("key1", "value1"); cache.put("key2", "value2"); // Obtain data from the cache String value1 = cache.getIfPresent("key1"); System.out.println(value1); // Delete data from the cache cache.invalidate("key2"); // Empty the cache cache.invalidateAll(); } } In the above example, we first create a caffeine cache object with a maximum capacity of 100.Then, we put the two key values into the cache and use the `put` method.Next, we use the `GetifPRESENT" method to obtain the key "Key1" from the cache.If the key exists, the corresponding value is returned; otherwise, return `null`.We can also use the `Invalidate` method to delete the specified key values pair from the cache, or use the` InvalityAll "method to clear the entire cache. In summary, the cache cache framework uses the cache in memory to store the frequent data used to improve the system performance and response speed.It can automatically eliminate the most recently used data through LRU strategy to manage the most recently used.By using the cache framework reasonably, we can easily achieve efficient data cache management.