1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.chukwa.util;
19
20 public class DaemonWatcher extends PidFile {
21 private static DaemonWatcher instance = null;
22
23 public synchronized static DaemonWatcher createInstance(String name) {
24 if(instance == null) {
25 instance = new DaemonWatcher(name);
26 Runtime.getRuntime().addShutdownHook(instance);
27 }
28 return instance;
29 }
30
31 public static DaemonWatcher getInstance() {
32 return instance;
33 }
34
35 private DaemonWatcher(String name) {
36 super(name);
37 }
38
39 public static void bailout(int status) {
40 System.exit(status);
41 }
42 }