/*
* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.arquillian.core.spi;
import java.util.Collection;
/**
* ServiceLoader
*
* @author <a href="mailto:aslak@conduct.no">Aslak Knutsen</a>
* @version $Revision: $
*/
public interface ServiceLoader {
/**
* Load multiple service implementations.
*
* @param serviceClass
* The service interface to load a implementations for
*
* @return A {@link Collection} of all instances of serviceClass
*/
<T> Collection<T> all(Class<T> serviceClass);
/**
* Load a single service implementation.
* <p>
* Method should throw {@link IllegalStateException} if multiple instances of serviceClass found.
*
* @param serviceClass
* The service interface to load a implementation for
*
* @return A instance of serviceClass
*
* @throws IllegalStateException
* if more then one implementation of serviceClass found
*/
<T> T onlyOne(Class<T> serviceClass);
/**
* Load a single service implementation.
* <p>
* Method should returns a new instance of defaultServiceClass if no other instance is found.
*
* @param serviceClass
* The service interface to load a implementation for
* @param defaultServiceClass
* If no other implementations found, create a instance of this class
*
* @return A instance of serviceClass
*/
<T> T onlyOne(Class<T> serviceClass, Class<? extends T> defaultServiceClass);
}