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,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.mina.util;
20
21 import org.slf4j.Logger;
22 import org.slf4j.LoggerFactory;
23
24 /**
25 * A {@link Runnable} wrapper that preserves the name of the thread after the runnable is
26 * complete (for {@link Runnable}s that change the name of the Thread they use.)
27 *
28 * @author The Apache MINA Project (dev@mina.apache.org)
29 */
30 public class NamePreservingRunnable implements Runnable {
31 private final static Logger LOGGER = LoggerFactory.getLogger(NamePreservingRunnable.class);
32
33 /** The runnable name */
34 private final String newName;
35
36 /** The runnable task */
37 private final Runnable runnable;
38
39 /**
40 * Creates a new instance of NamePreservingRunnable.
41 *
42 * @param runnable The underlying runnable
43 * @param newName The runnable's name
44 */
45 public NamePreservingRunnable(Runnable runnable, String newName) {
46 this.runnable = runnable;
47 this.newName = newName;
48 }
49
50 /**
51 * Run the runnable after having renamed the current thread's name
52 * to the new name. When the runnable has completed, set back the
53 * current thread name back to its origin.
54 */
55 public void run() {
56 Thread currentThread = Thread.currentThread();
57 String oldName = currentThread.getName();
58
59 if (newName != null) {
60 setName(currentThread, newName);
61 }
62
63 try {
64 runnable.run();
65 } finally {
66 setName(currentThread, oldName);
67 }
68 }
69
70 /**
71 * Wraps {@link Thread#setName(String)} to catch a possible {@link Exception}s such as
72 * {@link SecurityException} in sandbox environments, such as applets
73 */
74 private void setName(Thread thread, String name) {
75 try {
76 thread.setName(name);
77 } catch (SecurityException se) {
78 if (LOGGER.isWarnEnabled()) {
79 LOGGER.warn("Failed to set the thread name.", se);
80 }
81 }
82 }
83 }