001/**
002 * Copyright 2010-2014 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.common.util.runonce.smart;
017
018public interface RunOnce {
019
020        /**
021         * Do whatever is needed for isTrue() to return the correct value
022         */
023        void initialize();
024
025        /**
026         * Indicates it is safe to run something once.
027         */
028        boolean isTrue();
029
030        /**
031         * Update state in a way that persists across JVM restarts (eg database table, properties file, etc)
032         */
033        void changeState(RunOnceState state);
034
035}