1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.daemon; 19 20 /** 21 * Tags a Daemon as supporting some kind of 22 * signalling method that allows the java application to 23 * perform a custom action. 24 * <p> 25 * User must implement a signal method that will be called from 26 * native upon receiving {@code SIGUSR2} signal from the operating system. 27 * </p> 28 */ 29 public interface DaemonUserSignal 30 { 31 32 /** 33 * Performs a custom action on received user signal. 34 */ 35 void signal(); 36 37 }