Cache2k core implementation framework working principle

Cache2k is a Java -based open source cache library that provides high -performance and low -delay cache solutions.Its core implementation framework adopts a mechanism called Cache Permits to manage the entry in the cache. The concept of Cache Permits refers to allocating a permit for each cache entry to control access to the cache bar.In the cache2k, each cache entry contains a permit counter with a initial value of zero.When a thread requests a cache, cache2k checks the purpose permit counter.If the counter is zero, it means that the entry is not accessed at present, and Cache2k will allocate a permit for the entry and add the license counter.After that, all visits to the purpose will use this permission. By using Cache Permits, cache2k can achieve efficient concurrent access control.Multiple threads can read a cache strip at the same time without fighting.When the thread is to modify a cache entry, cache2k will check whether the target permitter is 1.If it is 1, only this thread can modify the entry.Other threads use licenses to obtain only visits for this purpose.This method reduces the lock size and improves the cache concurrent performance. The following is a simple Java code example, demonstrating the working principle of the Cache2K core implementation framework: import org.cache2k.Cache; import org.cache2k.Cache2kBuilder; public class Cache2kExample { public static void main(String[] args) { // Create a cache2k cache object Cache<String, String> cache = Cache2kBuilder.of(String.class, String.class) .permitQuiet(false) .build(); // Add entries to the cache cache.put("key1", "value1"); cache.put("key2", "value2"); // Read the strip from the cache String value1 = cache.get("key1"); String value2 = cache.get("key2"); System.out.println("Value 1: " + value1); System.out.println("Value 2: " + value2); } } In the above code, we used Cache2kbuilder to create a cache object and specify the type of key and values.Then, we added two entries to the cache, and used the GET method to read these two entries.Finally, we print these values. Through the core implementation framework of Cache2K, we can better manage access control of the cache bar, and improve the cache concurrent performance and response speed.