org.eclipse.osbp.xtext.reportdsl.oda.datamart/src/org/eclipse/osbp/xtext/reportdsl/oda/datamart/ServiceListener.java

/**
 *                                                                            
 * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * All rights reserved. This program and the accompanying materials           
 * are made available under the terms of the Eclipse Public License 2.0        
 * which accompanies this distribution, and is available at                  
 * https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 * SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 * Contributors:   
 * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation 
 */
package org.eclipse.osbp.xtext.reportdsl.oda.datamart;

import java.util.HashSet;
import java.util.Set;

import org.eclipse.osbp.utils.classloader.IClassLoader;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;


@Component
public class ServiceListener {
	
	private static final Set<IClassLoader> sClassLoaderServices = new HashSet<IClassLoader>();

	/**
	 *  @param className
	 *  @return reloaded class via declarative services
	 */
	public static Class<?> reloadClass(String className) {
		Class<?> reloadedClass = null;
		for	(IClassLoader classLoader : sClassLoaderServices) {
			reloadedClass = classLoader.reloadClass(className);
			if	(reloadedClass != null) {
				return reloadedClass;
			}
		}
		return null;
	}

	/**
	 * @param classLoaderService declarative service loaded
	 */
	@Reference(cardinality = ReferenceCardinality.MULTIPLE, policy = ReferencePolicy.DYNAMIC)
	public static void bindClassLoaderService(IClassLoader classLoaderService) {
		System.err.println(ServiceListener.class.getCanonicalName()+": "+classLoaderService.getClass().getCanonicalName()+" bound");
		sClassLoaderServices.add(classLoaderService);
	}

	/**
	 * @param classLoaderService declarative service unloaded
	 */
	public static void unbindClassLoaderService(IClassLoader classLoaderService) {
		System.err.println(ServiceListener.class.getCanonicalName()+": "+classLoaderService.getClass().getCanonicalName()+" unbound");
		sClassLoaderServices.remove(classLoaderService);
	}

}