The design principle and implementation method of the cache framework in the Java class library

The design principles and implementation methods of the cache framework in the Java class library Summary: When developing large Java applications, cache is one of the key technologies to improve application performance and response time.Caffeine cache framework is an efficient tool for managing and optimizing memory cache. It provides many flexible configuration options and algorithms to meet the needs of various applications.This article will introduce the design principles and implementation methods of the caching cache framework, and provide complete programming code and related configuration. 1 Introduction As the complexity of modern applications continues to increase, the requirements for performance are getting higher and higher.Ccheca is a technology that stored data in high -speed memory to improve access speed, which can significantly reduce the number of access to the underlying data source, thereby improving the performance and response time of the application.The cache cache framework is a highly flexible and easy to use Java library for managing and optimizing memory cache. 2. Design principle The design principle of caffeine caching framework is based on the following core concepts: 2.1 cache strategy The caffine cache frame supports a variety of cache strategies, including a fixed size and a weight -based capacity.The capacity strategy based on a fixed size controls the number of objects in the number of objects in the cache to control the cache size.The weight -based capacity strategy controls the size of each object as the weight and the total capacity of the entire cache. 2.2 cache expiration The caffine cache framework allows the expiration time for each cache item. Once the cache item expires, it will be automatically removed from the cache.The cache expires can be triggered based on time or based on access frequency.By setting the appropriate expiration time, you can avoid outdated data during cache. 2.3 Caches loading To improve the performance of the application, the caffeine cache framework supports asynchronous loading cache.When there is no value of a certain key in the cache, the frame will automatically trigger the loading operation and load the data into the cache.This can avoid expensive calculations or database queries at each access cache. 2.4 cache recovery The caffine cache framework uses a recycling strategy based on access frequency and reference relationship.It determines whether the cache item is recycled based on the access frequency and reference relationship of the cache to release the memory space.The recycling strategy can be optimized according to the needs of specific applications. 3. Implementation method 3.1 Add dependence To use the caching framework, we first need to add the following dependencies to the Maven or Gradle Construction Tools: // Maven <dependency> <groupId>com.github.ben-manes.caffeine</groupId> <artifactId>caffeine</artifactId> <version>2.9.1</version> </dependency> // Gradle implementation 'com.github.ben-manes.caffeine:caffeine:2.9.1' 3.2 Create a cache instance Use the following code to create a simple cache cache instance: 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 instance Cache<String, String> cache = Caffeine.newBuilder() .maximumSize(100) .build(); // Add data to the cache cache.put("key1", "value1"); // Obtain data from the cache System.out.println(cache.getIfPresent("key1")); } } In this example, we use the `Caffeine.newbuilder ()` to create a cache builder, and then set the maximum cache size to 100 objects.The key value is added to the cache through the `put` method, and the value of the cache is obtained through the` GetifPreSent` method. 3.3 Configuration cache strategy The caffine cache framework provides many configuration options to meet different application needs.Some commonly used configuration options are shown below: Cache<String, String> cache = Caffeine.newBuilder() .maximumSize(100) .expireAfterWrite(10, TimeUnit.MINUTES) .refreshAfterWrite(1, TimeUnit.MINUTES) .weakKeys() .weakValues() .build(); In this example, we set up the maximum cache size to 100 objects, set up 10 minutes after writing, and automatically refresh after 1 minute.Through the method of `Weakkeys` and` Weakvalues, we use weak references to use the key and values in the cache to automatically recover when the memory is insufficient. 4. Summary Caffeine cache framework is a powerful and easy -to -use Java class library. It provides many flexible configuration options and algorithms to manage and optimize memory cache.Through reasonable configuration of cache strategies and the use of appropriate recycling mechanisms, the performance and response time of the application can be improved.We hope that the design principles and implementation methods described in this article can help readers better understand the use of cache cache framework. references: - Caffeine GitHub: https://github.com/ben-manes/caffeine [Full sample code, please visit the github link] (https://github.com/ben-manes/caffeine)