Introduction to the technical principles of JSR107 API and SPI frameworks
JSR107 (Java Specification Request 107) is a Java cache specification that provides a standard API and SPI framework for the cache function in Java applications.API defines the basic operation of cache, such as obtaining, storage and deleting data, while the SPI framework allows developers to expand and customize different types of cache implementation.
API is one of the most important part of the JSR107. It provides a set of interfaces and classes for operation cache.Using these interfaces, developers can store and retrieve data through simple methods.In addition, API also defines some additional functions, such as cache failure and event monitoring.Below is an example code using the JSR107 API:
import javax.cache.Cache;
import javax.cache.CacheManager;
import javax.cache.Caching;
import javax.cache.configuration.MutableConfiguration;
public class Jsr107Example {
public static void main(String[] args) {
// Create a cache manager
CacheManager cacheManager = Caching.getCachingProvider().getCacheManager();
// Create a cache configuration
MutableConfiguration<String, Integer> config = new MutableConfiguration<>();
// Create a cache
Cache<String, Integer> cache = cacheManager.createCache("myCache", config);
// Store data to the cache
cache.put("key1", 10);
// Obtain data from the cache
Integer value = cache.get("key1");
System.out.println (value); // Output: 10
// Delete data from the cache
cache.remove("key1");
// Turn off the cache manager
cacheManager.close();
}
}
SPI (Service Provider Interface) is another important part of JSR107, which allows developers to expand and custom cache implementation.The SPI framework provides an insertable cache implementation mechanism by using the decoupling method between the interface and the implementation class.Developers can create their own implementation classes, realize the interface defined in JSR107, and then configure it to cache provider.
Below is a sample code that uses the JSR107 SPI framework to achieve custom cache:
import javax.cache.configuration.Factory;
import javax.cache.configuration.FactoryBuilder;
import javax.cache.spi.CachingProvider;
import java.util.Properties;
public class CustomCacheProvider implements CachingProvider {
// Methods in the CachingProvider interface
@Override
public <K, V, C extends javax.cache.configuration.Configuration<K, V>> javax.cache.CacheManager createCacheManager(
URI uri, ClassLoader classLoader, Properties properties) {
// Create a custom cache manager
return new CustomCacheManager(this, uri, classLoader, properties);
}
@Override
public <K, V> javax.cache.CacheManager getCacheManager(URI uri, ClassLoader classLoader, Properties properties) {
// Get the cache manager. If there is no existence, create a new one
return createCacheManager(uri, classLoader, properties);
}
@Override
public CachingProvider getFallbackCachingProvider() {
return null;
}
@Override
public void close() {
// Close the cache provider
}
@Override
public void close(ClassLoader classLoader) {
// Close the cache provider under the specified class loader
}
@Override
public void close(URI uri, ClassLoader classLoader) {
// Close the cache provider under the specified URI and class loader
}
@Override
public boolean isSupported(OptionalFeature optionalFeature) {
return false;
}
@Override
public String toString() {
return "CustomCacheProvider";
}
}
public class CustomCacheManager implements javax.cache.CacheManager {
// Methods in the cacheManager interface
public CustomCacheManager(CachingProvider cachingProvider, URI uri, ClassLoader classLoader, Properties properties) {
// Initialize custom cache manager
}
@Override
public CachingProvider getCachingProvider() {
return cachingProvider;
}
@Override
public URI getURI() {
return uri;
}
// The implementation of other methods
}
public class CustomCacheConfiguration<K, V> implements javax.cache.configuration.Configuration<K, V> {
// Methods in the Configuration interface
@Override
public Class<K> getKeyType() {
return null;
}
@Override
public Class<V> getValueType() {
return null;
}
@Override
public boolean isStoreByValue() {
return false;
}
@Override
public boolean isStatisticsEnabled() {
return false;
}
@Override
public boolean isManagementEnabled() {
return false;
}
@Override
public CacheEntryListenerConfiguration<K, V> getCacheEntryListenerConfiguration() {
return null;
}
@Override
public Factory<CacheLoader<K, V>> getCacheLoaderFactory() {
return null;
}
@Override
public Factory<CacheWriter<? super K, ? super V>> getCacheWriterFactory() {
return null;
}
@Override
public Factory<ExpiryPolicy> getExpiryPolicyFactory() {
return null;
}
@Override
public ClassLoader getClassLoader() {
return null;
}
@Override
public Collection<Class<?>> getIntegration() {
return null;
}
}
In the above sample code, CustomCacheProvider is an implementation class for custom cache providers. CustomCacheManager is the implementation class of a custom cache manager, and the CustomCacheCONFIGURATION is an implementation class of custom cache configuration.Developers can implement these interfaces as needed to create cache implementation that meets their needs.
In summary, the JSR107 provides a standard API and SPI framework to achieve and customize cache functions in Java applications.By using the JSR107 API, developers can easily manage and operate the cache.By using the JSR107 SPI framework, developers can create their own cache providers and use custom cache.These functions enable developers to better use the cache mechanism and improve the performance and response speed of applications.
