Learn about the technical principles of the cache framework in the Java library
The cache cache framework is a commonly used tool in the Java class library to improve the performance and response speed of the application.It is based on memory cache, and uses caffeine cache principles to store frequent access to data in memory to avoid repeated reading, calculation or query database.
The core principle of the caffine cache framework is based on the storage design of Key-Value.When using this framework, you first need to define a cache object. You can use the `build` method of the` Caffeine` class.Then you can use different configuration methods to set the cache size, expiration time, and recycling strategy.
The following is a simple example of data cache using the cache frame to cache:
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 capacity of the cache
.expireaFTERWRITE (10, Timeunit.minutes) // Set the expiration time of the cache object
.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); // Output: Value1
// Delete the data in the cache
cache.invalidate("key2");
String value2 = cache.getIfPresent("key2");
System.out.println (value2); // Output: null
}
}
In the above examples, first create a `Cache` method through the` newBuilder` method of the `Caffeine` class, and set the maximum capacity and expiration time of the cache to call the method of calling` Maximsize` and `ExpireafterWrite`.Then, use the `put` method to put the data into the cache, use the` GetifPreSent` method to obtain the data from the cache, and use the `Invalidate` method to delete the data in the cache.
The cache cache framework also provides some other functions, such as asynchronous loading data, custom cache strategies and statistical information collection.By reasonable use of the cache framework, it can significantly improve the performance of the application, reduce the operations and other operations of repeated calculations and database query, thereby improving the user experience and system response speed.