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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  }