How to correctly use the Cache2k core implementation framework in the Java class library
How to correctly use the Cache2k core implementation framework in the Java class library
introduce:
Cache2k is a high -performance memory cache library that can be used to effectively manage and improve access speed in Java applications.It provides a fast, flexible and easy -to -use cache solution that can significantly reduce the delay brought by IO operation.This article will introduce how to correctly use the cache2k library in the Java library.
Step 1: Add Cache2K dependency item
First, we need to add cache2k dependency items to the project.You can add the following dependencies to the pom.xml file:
<dependencies>
<dependency>
<groupId>org.cache2k</groupId>
<artifactId>cache2k-all</artifactId>
<version>2.2.1.Final</version>
</dependency>
</dependencies>
Then, run Maven to download and import the required dependencies.
Step 2: Create a cache instance
Next, we need to create an instance of a Cache2K cache.You can use the Cachebuilder class to create a new cache instance.The following is an example:
import org.cache2k.Cache;
import org.cache2k.CacheBuilder;
public class MyCacheExample {
public static void main(String[] args) {
// Create a new cache example
Cache<String, String> cache = CacheBuilder.newBuilder(String.class, String.class)
.name("myCache")
.build();
// Put the value in the cache
cache.put("key1", "value1");
cache.put("key2", "value2");
// Get the value from the cache
String value1 = cache.get("key1");
String value2 = cache.get("key2");
System.out.println (Value1); // Output: Value1
System.out.println (value2); // Output: Value2
}
}
Step 3: Configure the cache attribute
Cache2k also allows us to configure the cache various attributes to meet specific needs.For example, the maximum size, expiration time, listener, etc. that cache can be set.The following is an example:
import org.cache2k.Cache;
import org.cache2k.CacheBuilder;
import org.cache2k.configuration.Cache2kConfiguration;
import org.cache2k.event.CacheEntryCreatedListener;
public class MyCacheExample {
public static void main(String[] args) {
// Create a new cache example
Cache<String, String> cache = CacheBuilder.newBuilder(String.class, String.class)
.name("myCache")
.entrycapacity (1000) // Set the maximum size of the cache
.expireaFTERWRITE (60_000) // Set the cache expiration time (millisecond)
.addListener(new CacheEntryCreatedListener<String, String>() {
@Override
public void onEntryCreated(Cache<String, String> cache, CacheEntry<String, String> entry) {
System.out.println ("The cache item has been created:" + entry.getkey ());
}
})
.build();
// Put the value in the cache
cache.put("key1", "value1");
cache.put("key2", "value2");
// Get the value from the cache
String value1 = cache.get("key1");
String value2 = cache.get("key2");
System.out.println (Value1); // Output: Value1
System.out.println (value2); // Output: Value2
}
}
Step 4: Treat the abnormality in the cache
When using Cache2k, you can also deal with the possible abnormalities in the cache.For example, when there is no key in the cache, you can return the silent value.The following is an example:
import org.cache2k.Cache;
import org.cache2k.CacheBuilder;
import org.cache2k.integration.CacheLoader;
public class MyCacheExample {
public static void main(String[] args) {
// Create a new cache example
Cache<String, String> cache = CacheBuilder.newBuilder(String.class, String.class)
.name("myCache")
.sharpexpiry (true) // Open the altosity abnormality processing
.loader(new CacheLoader<String, String>() {
@Override
public String load(String key) throws Exception {
System.out.println ("load" + key);
Return "default value"; // Returns the silent value when there is no existence in the cache
}
})
.build();
// Get the value from the cache
String value1 = cache.get("key1");
String value2 = cache.get("key2");
System.out.println (value1); // Output: default value
System.out.println (value2); // Output: default value
}
}
in conclusion:
By using the Cache2k library, we can manage and use the cache efficiently in the Java class library.These simple sample code demonstrate how to create a cache instance, configuration cache attributes, and processing abnormal conditions in the cache.The use of cache2k can significantly improve the performance of the application and reduce delay.I hope this article provides some guidance and help to you in the Java library.
