001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.mina.util; 020 021import org.slf4j.Logger; 022import org.slf4j.LoggerFactory; 023 024/** 025 * A {@link Runnable} wrapper that preserves the name of the thread after the runnable is 026 * complete (for {@link Runnable}s that change the name of the Thread they use.) 027 * 028 * @author <a href="http://mina.apache.org">Apache MINA Project</a> 029 */ 030public class NamePreservingRunnable implements Runnable { 031 private final static Logger LOGGER = LoggerFactory.getLogger(NamePreservingRunnable.class); 032 033 /** The runnable name */ 034 private final String newName; 035 036 /** The runnable task */ 037 private final Runnable runnable; 038 039 /** 040 * Creates a new instance of NamePreservingRunnable. 041 * 042 * @param runnable The underlying runnable 043 * @param newName The runnable's name 044 */ 045 public NamePreservingRunnable(Runnable runnable, String newName) { 046 this.runnable = runnable; 047 this.newName = newName; 048 } 049 050 /** 051 * Run the runnable after having renamed the current thread's name 052 * to the new name. When the runnable has completed, set back the 053 * current thread name back to its origin. 054 */ 055 public void run() { 056 Thread currentThread = Thread.currentThread(); 057 String oldName = currentThread.getName(); 058 059 if (newName != null) { 060 setName(currentThread, newName); 061 } 062 063 try { 064 runnable.run(); 065 } finally { 066 setName(currentThread, oldName); 067 } 068 } 069 070 /** 071 * Wraps {@link Thread#setName(String)} to catch a possible {@link Exception}s such as 072 * {@link SecurityException} in sandbox environments, such as applets 073 */ 074 private void setName(Thread thread, String name) { 075 try { 076 thread.setName(name); 077 } catch (SecurityException se) { 078 if (LOGGER.isWarnEnabled()) { 079 LOGGER.warn("Failed to set the thread name.", se); 080 } 081 } 082 } 083}