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
018package org.apache.commons.daemon;
019
020/**
021 * Tags a Daemon as supporting some kind of
022 * signalling method that allows the Java application to
023 * perform a custom action.
024 * <p>
025 * User must implement a signal method that will be called from
026 * native upon receiving {@code SIGUSR2} signal from the operating system.
027 * </p>
028 */
029public interface DaemonUserSignal
030{
031
032    /**
033     * Performs a custom action on received user signal.
034     */
035    void signal();
036
037}