001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.functor;
018    
019    /**
020     * A functor that takes no arguments and returns no value.
021     * <p>
022     * Note that this functor implements the
023     * {@link Runnable Runnable}
024     * interface, making all <code>Procedure</code>s
025     * immediately usable in a number of contexts (Swing, Jelly, etc.).
026     * </p>
027     * <p>
028     * Implementors are encouraged but not required to make their functors
029     * {@link java.io.Serializable Serializable}.
030     * </p>
031     *
032     * @since 1.0
033     * @version $Revision: 647290 $ $Date: 2008-04-11 22:08:44 +0200 (Fri, 11 Apr 2008) $
034     * @author Rodney Waldhoff
035     */
036    public interface Procedure extends NullaryFunctor, Runnable {
037        /** Execute this procedure. */
038        void run();
039    }