/*************************************************************************
* Copyright 2009-2015 Eucalyptus Systems, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
* CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
* additional information or have any questions.
************************************************************************/
package com.eucalyptus.auth;
import java.util.List;
import java.util.ServiceLoader;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
/**
*
*/
public class Regions {
private static Supplier<RegionProvider> regionProviderSupplier = serviceLoaderSupplier( RegionProvider.class );
private static <T> Supplier<T> serviceLoaderSupplier( final Class<T> serviceClass ) {
return Suppliers.memoize( new Supplier<T>() {
@Override
public T get() {
return ServiceLoader.load( serviceClass ).iterator().next();
}
} );
}
private static RegionProvider getRegionProvider( ) {
return regionProviderSupplier.get( );
}
public static List<RegionService> getRegionServicesByType( final String serviceType ) {
return getRegionProvider( ).getRegionServicesByType( serviceType );
}
public interface RegionProvider {
List<RegionService> getRegionServicesByType( String serviceType );
}
}