/**
* This file Copyright (c) 2011-2012 Magnolia International
* Ltd. (http://www.magnolia-cms.com). All rights reserved.
*
*
* This file is dual-licensed under both the Magnolia
* Network Agreement and the GNU General Public License.
* You may elect to use one or the other of these licenses.
*
* This file is distributed in the hope that it will be
* useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
* Redistribution, except as permitted by whichever of the GPL
* or MNA you select, is prohibited.
*
* 1. For the GPL license (GPL), you can redistribute and/or
* modify this file under the terms of the GNU General
* Public License, Version 3, as published by the Free Software
* Foundation. You should have received a copy of the GNU
* General Public License, Version 3 along with this program;
* if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 2. For the Magnolia Network Agreement (MNA), this file
* and the accompanying materials are made available under the
* terms of the MNA which accompanies this distribution, and
* is available at http://www.magnolia-cms.com/mna.html
*
* Any modifications to this file must keep this entire header
* intact.
*
*/
package info.magnolia.objectfactory;
/**
* ComponentFactory that provides an instance by reading it from a repository. The instance is created only when it is
* needed and is recreated if its configuration changes in the repository.
*
* @param <T> the type of component this factory instantiates.
* @version $Id$
*/
public class LazyObservedComponentFactory<T> implements ComponentFactory<T> {
private String repository;
private String path;
private Class<T> type;
private ObservedComponentFactory<T> observedComponentFactory;
private ComponentProvider componentProvider;
public LazyObservedComponentFactory(String repository, String path, Class<T> type, ComponentProvider componentProvider) {
this.repository = repository;
this.path = path;
this.type = type;
this.componentProvider = componentProvider;
}
@Override
public synchronized T newInstance() {
if (observedComponentFactory == null) {
observedComponentFactory = new ObservedComponentFactory<T>(repository, path, type, componentProvider);
}
return observedComponentFactory.newInstance();
}
}