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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* 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.core.logging.api;
import java.util.Iterator;
import java.util.ServiceLoader;
/**
* Contains common functionality for factories used in the logging framework. <p>In order to use the
* factory, a particular (e.g. framework-specific) implementation of a service must be configured as
* described in <a href="http://docs.oracle.com/javase/8/docs/api/java/util/ServiceLoader.html">java.util.ServiceLoader</a>).</p>
*
* @see java.util.ServiceLoader
*/
public class BaseFactory {
protected static <T> T locateService(Class<T> clazz) throws Exception {
T service;
ServiceLoader<T> loader = ServiceLoader.load(clazz);
Iterator<T> iterator = loader.iterator();
if (iterator.hasNext()) {
service = iterator.next();
if (iterator.hasNext()) {
System.err.println(String.format("Warning! Configured more than one implementation of %s",
clazz.getName()));
}
return service;
}
throw new IllegalArgumentException(
(String.format("No implementations configured for %s", clazz.getName())));
}
}
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