/*******************************************************************************
* Copyright (c) 2008, 2014 Stuart McCulloch
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Stuart McCulloch - initial API and implementation
*******************************************************************************/
package org.eclipse.sisu.peaberry;
/**
* A service watcher can receive services provided by other registries.
*
* @author mcculls@gmail.com (Stuart McCulloch)
*
* @since 1.1
*/
public interface ServiceWatcher<S> {
/**
* Add the given service to this watcher.
*
* @param service imported service handle
* @return exported service handle, null if the watcher is not interested
*/
<T extends S> Export<T> add(Import<T> service);
}