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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.mso.client.dmaap;
import java.util.ServiceLoader;
public class DmaapPropertiesLoader {
private final ServiceLoader<DmaapProperties> services;
private DmaapPropertiesLoader() {
services = ServiceLoader.load(DmaapProperties.class);
}
private static class Helper {
private static final DmaapPropertiesLoader INSTANCE = new DmaapPropertiesLoader();
}
public static DmaapPropertiesLoader getInstance() {
return Helper.INSTANCE;
}
public DmaapProperties getImpl() {
return this.getImpl(false);
}
public DmaapProperties getNewImpl() {
return this.getImpl(true);
}
private DmaapProperties getImpl(boolean forceNewInstance) {
for (DmaapProperties service : services) {
if (forceNewInstance) {
try {
return service.getClass().newInstance();
} catch (InstantiationException | IllegalAccessException e) {
/* all spi implementations must provide a public
* no argument constructor
*/
}
} else {
return service;
}
}
return null;
}
}
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