injector/src/main/java/ch/jalu/injector/factory/SingletonStore.java
package ch.jalu.injector.factory;
import java.util.Collection;
/**
* Injectable object to retrieve and create singletons of a common parent.
*
* @param <P> the parent class to which this store is limited to
*/
public interface SingletonStore<P> {
/**
* Returns the singleton of the given type, creating it if it hasn't yet been created.
*
* @param clazz the class to get the singleton for
* @param <C> type of the singleton
* @return the singleton of type {@code C}
*/
<C extends P> C getSingleton(Class<C> clazz);
/**
* Returns all existing singletons of this store's type.
*
* @return all registered singletons of type {@code P}
*/
Collection<P> retrieveAllOfType();
/**
* Returns all existing singletons of the given type.
*
* @param clazz the type to get singletons for
* @param <C> class type
* @return all registered singletons of type {@code C}
*/
<C extends P> Collection<C> retrieveAllOfType(Class<C> clazz);
}