Analysis of the working principle of the cache framework in the java class library
Analysis of the working principle of the cache framework in the java class library
introduction:
In many applications, cache is one of the key factors to improve performance.A popular cache framework used in the Java library is caffine cache (Caffeine Cache).This article will analyze the working principle of cache cache framework and provide some Java code examples to help readers better understand the framework.
1. Introduction to caching cache
Caffeine cache is a high -performance cache library for Java applications.It uses memory as a cache storage and provides many characteristics, such as nearly real -time performance, asynchronous loading, cache out of strategy, etc.The goal of caffeine cache is to provide fast, simple and reliable cache solutions.
2. Use of caffeine cache
The use of caffeine cache is very simple.First, we need to add related dependence to our project.For example, if you use Maven to build a project, you can add the following dependencies:
<dependency>
<groupId>com.github.ben-manes.caffeine</groupId>
<artifactId>caffeine</artifactId>
<version>2.9.0</version>
</dependency>
Then, in our Java code, we can create a cache instance and start using it.The following is a simple example:
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();
// Put the data into the cache
cache.put("key", "value");
// Obtain data from the cache
String value = cache.getIfPresent("key");
System.out.println(value);
}
}
In the above example, we created a cache instance with a maximum capacity of 100, and put the key values on the cache on "Key" and "Value".Then, when using the `Getifresent` method to obtain data from the cache, we can obtain the corresponding value according to the key.
Third, the working principle of caffeine cache
Caffeine cache uses a data structure similar to the hash table to store cache data.When we use the `PUT` method to put the data into the cache, the caffeine cache will store the data into the internal data structure according to the hash value of the key.When we use the `Get` method to obtain data, the caffeine cache will find the corresponding storage position based on the hash value of the key and return the corresponding value.
Fourth, summary
This article introduces the working principle of the cache framework in the Java class library and provides a simple Java code example.Caffeine cache is a high -performance, simple and reliable cache solution, which is suitable for most Java applications.By understanding the working principle of caffeine cache, we can better use the framework to improve the performance of the application.
