Introduction to the technical principle of core cache framework in the Java class library

Introduction to the technical principle of core cache framework in the Java class library Caches is a common technology that improves system performance and response speed, while the core cache framework is a solution widely used in the Java class library.This article will introduce the principle of the core cache framework and provide some Java code examples. 1. Overview of the core cache framework The core caching framework is a technology that caches data according to the needs of the application. It stores the frequently used data in memory to quickly access and reduce the burden of back -end resources.This can greatly improve the performance and response speed of the system. The design goal of the core caching framework is to provide flexible and scalable cache management mechanisms. It should be able to adapt to various application scenarios and different scale application systems.In the Java library, there are many excellent open source cache frames to choose from, and they usually provide some common core principles. Second, the principle of the core cache framework The core caching framework is generally based on the following principles: 1. Reading and writing strategy: The core cache framework usually provides a variety of reading and writing strategies, such as LRU (recently used at least) and LFU (minimum use).These strategies are used to determine when to read data from the cache and when to write the data back to the cache. 2. Cache data structure: The core cache framework uses an efficient data structure to store cache data. Common hash tables and red and black trees.These data structures can provide fast data access and update operations. 3. Cache failure strategy: Since the data in the cache may expire or fail at any time, the core cache framework provides a variety of failure strategies, such as time -based failure and event failure.These strategies are used to determine when to remove expired data from the cache. 4. Cache synchronization mechanism: When multiple clients access the cache at the same time, the core cache framework must provide a synchronization mechanism to ensure data consistency.Common synchronization mechanisms include reading and writing locks and optimistic locks. 3. Example of the use of the core cache framework Below is an example of a simple use of the core cache framework. It uses the open source cache framework EHCACHE commonly used in the Java class library: import net.sf.ehcache.Cache; import net.sf.ehcache.CacheManager; import net.sf.ehcache.Element; public class CacheExample { public static void main(String[] args) { // Create a cache manager CacheManager cacheManager = CacheManager.newInstance(); // Create a cache object Cache cache = new Cache("myCache", 1000, false, false, 60, 30); cacheManager.addCache(cache); // Store data to the cache Element element = new Element("key", "value"); cache.put(element); // Obtain data from the cache Element result = cache.get("key"); System.out.println(result.getObjectValue()); // Turn off the cache manager cacheManager.shutdown(); } } In the above code, the cache manager Cachemanager was first created, and initialized through the newInstance () method.Then create a cache object called "MyCache" cache object, and set the cache capacity, failure time and other parameters, and then add the cache object to the cache manager through the addcache () method. Then, use the Element object to store the key value on the cache "key": "value", and then obtain the value of "key" from the cache to the console through the get () method. Finally, use cacheManager's Shutdown () method to close the cache manager. Summarize: The core cache frame is an important technology in the Java library, which can improve system performance and response speed.This article introduces the principle of the core cache framework and provides a simple example of using EHCACHE.Using the core cache framework can help developers make better use of memory resources and improve the performance of the system.