The technical principles of the Circumflex Cache framework in the Java class library analysis
Circumflex Cache is a lightweight Java cache framework that provides high performance and scalability.Its technical principles are based on some key concepts and design models, which help improve cache efficiency and ease of use.
1. Cache principle
The core principle of Circumflex Cache is to store the frequently used data in memory to reduce access to databases or other slow data sources.It uses a key -value -based data structure that can use any object as a key and value.In this way, when we need a certain value, we only need to provide a key to get the value without performing complex query or calculation operations.
2. Object storage and retrieval
Circumflex Cache uses a HashMap to store the cache object.When an object is added to the cache, it is stored as a key value pair. The key is the unique identifier of the object, and the value is the object itself.By using HashMap, Circumflex Cache can quickly index and access the cache object without having to traverse the entire cache.
Below is a simple Java code example, demonstrating how to use the Circumflex Cache storage and retrieval object:
import com.bertramlabs.plugins.cache.Cache;
import com.bertramlabs.plugins.cache.CacheFactory;
public class CircumflexCacheExample {
public static void main(String[] args) {
// Create a cache instance
Cache cache = CacheFactory.getInstance();
// Storage objects to cache
String key = "user:1"; // 键
User user = new User("John Doe", "john@example.com"); // 值
cache.store(key, user);
// Search the object from the cache
User cachedUser = (User) cache.get(key);
System.out.println (cacheduser.getName ()); // Output "John Doe"
System.out.println (cacheduser.Getemail ()); // output "john@example.com"
}
}
class User {
private String name;
private String email;
public User(String name, String email) {
this.name = name;
this.email = email;
}
public String getName() {
return name;
}
public String getEmail() {
return email;
}
}
In the above example, we first obtained a Circumflex Cache instance through the `cacheFactory.getInstance ()`.Then, we use the `Store` method to store a user object into the cache, where the key is" user: 1 ", and the value is a user instance.Finally, we use the `Get` method to obtain the user object from the cache and access its attributes by calling the object.
3. Cache strategy and expired management
Circumflex Cache also provides flexible cache strategies and expired management mechanisms.By speculating the expiration time of the cache object, we can control the object in the cache to expire automatically after a period of time and remove it from the cache.This can help us avoid removal of expired or useless data in cache, thereby saving memory and improving performance.
The following is a sample demonstration of how to set the expiration time of the object in the Circumflex Cache: the expiration time:
import com.bertramlabs.plugins.cache.Cache;
import com.bertramlabs.plugins.cache.CacheFactory;
public class CircumflexCacheExample {
public static void main(String[] args) throws InterruptedException {
Cache cache = CacheFactory.getInstance();
String key = "user:1";
User user = new User("John Doe", "john@example.com");
int Expiration = 10; // Expired time (in seconds)
cache.store(key, user, expiration);
User cachedUser = (User) cache.get(key);
System.out.println (cacheduser.getName ()); // Output "John Doe"
System.out.println (cacheduser.Getemail ()); // output "john@example.com"
Thread.sleep (11000); // Waiting for the expiration time
cachedUser = (User) cache.get(key);
System.out.println (cacheduser); // output "null"
}
}
In the above example, we store a User object into the cache through the `Store` method, and set the expiration time for 10 seconds.After waiting for an expiration time, we get the object from the cache again through the key. At this time, the result returned is null, indicating that the object has expired and removed from the cache.
Summarize:
Circumflex Cache is a powerful and flexible Java cache framework. It is based on the concept of simple key -value pairs and uses HashMap to achieve efficient object storage and retrieval.It also provides a flexible cache strategy and expired management mechanism in order to control the life cycle of the object in the cache according to needs.By using Circumflex Cache, we can significantly improve the performance and response speed of the application.
