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 * @version $Rev: 446581 $, $Date: 2006-09-15 11:36:12Z $,
30 */
31 public class NamePreservingRunnable implements Runnable {
32 private final Logger logger = LoggerFactory.getLogger(NamePreservingRunnable.class);
33
34 /** The runnable name */
35 private final String newName;
36
37 /** The runnable task */
38 private final Runnable runnable;
39
40 /**
41 * Creates a new instance of NamePreservingRunnable.
42 *
43 * @param runnable The underlying runnable
44 * @param newName The runnable's name
45 */
46 public NamePreservingRunnable(Runnable runnable, String newName) {
47 this.runnable = runnable;
48 this.newName = newName;
49 }
50
51 /**
52 * Run the runnable after having renamed the current thread's name
53 * to the new name. When the runnable has completed, set back the
54 * current thread name back to its origin.
55 */
56 public void run() {
57 Thread currentThread = Thread.currentThread();
58 String oldName = currentThread.getName();
59
60 if (newName != null) {
61 setName(currentThread, newName);
62 }
63
64 try {
65 runnable.run();
66 } finally {
67 setName(currentThread, oldName);
68 }
69 }
70
71 /**
72 * Wraps {@link Thread#setName(String)} to catch a possible {@link Exception}s such as
73 * {@link SecurityException} in sandbox environments, such as applets
74 */
75 private void setName(Thread thread, String name) {
76 try {
77 thread.setName(name);
78 } catch (SecurityException se) {
79 if (logger.isWarnEnabled()) {
80 logger.warn("Failed to set the thread name.", se);
81 }
82 }
83 }
84 }