act.util.SingletonBase Maven / Gradle / Ivy
package act.util;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import org.osgl.util.E;
/**
* Application could extend this class to create singleton classes.
*
* Note, the sub type must NOT be abstract and has public constructor
*
*/
public abstract class SingletonBase extends LogSupportedDestroyableBase {
/**
* Returns the singleton instance of the sub type
* @param the sub type of {@code SingletonBase}
* @return the instance
*/
public static T instance() {
throw E.tbd("This method will be enhanced on sub type of SingletonBase class");
}
}