io.scalecube.utils.ServiceLoaderUtil Maven / Gradle / Ivy
package io.scalecube.utils;
import java.util.Optional;
import java.util.ServiceLoader;
import java.util.function.Predicate;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
public final class ServiceLoaderUtil {
private ServiceLoaderUtil() {
// Do not instantiate
}
/**
* Finds the first implementation of the given service type and creates its instance.
*
* @param clazz service type
* @return the first implementation of the given service type
*/
public static Optional findFirst(Class clazz) {
ServiceLoader load = ServiceLoader.load(clazz);
return StreamSupport.stream(load.spliterator(), false).findFirst();
}
/**
* Finds the first implementation of the given service type using the given predicate to filter
* out found service types and creates its instance.
*
* @param clazz service type
* @param predicate service type predicate
* @return the first implementation of the given service type
*/
public static Optional findFirst(Class clazz, Predicate predicate) {
ServiceLoader load = ServiceLoader.load(clazz);
Stream stream = StreamSupport.stream(load.spliterator(), false);
return stream.filter(predicate).findFirst();
}
/**
* Finds all implementations of the given service type and creates their instances.
*
* @param clazz service type
* @return implementations' stream of the given service type
*/
public static Stream findAll(Class clazz) {
ServiceLoader load = ServiceLoader.load(clazz);
return StreamSupport.stream(load.spliterator(), false);
}
/**
* Finds all implementations of the given service type using the given predicate to filter out
* found service types and creates their instances.
*
* @param clazz service type
* @param predicate service type predicate
* @return implementations' stream of the given service type
*/
public static Stream findAll(Class clazz, Predicate predicate) {
ServiceLoader load = ServiceLoader.load(clazz);
return StreamSupport.stream(load.spliterator(), false).filter(predicate);
}
}