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 * https://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 * signaling 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 }