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 * http://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.log4j.or; 19 20 import org.apache.log4j.Layout; 21 22 23 /** 24 Render {@link ThreadGroup} objects in a format similar to the 25 information output by the {@link ThreadGroup#list} method. 26 @author Ceki Gülcü 27 @since 1.0 */ 28 public class ThreadGroupRenderer implements ObjectRenderer { 29 30 public 31 ThreadGroupRenderer() { 32 } 33 34 /** 35 Render a {@link ThreadGroup} object similar to the way that the 36 {@link ThreadGroup#list} method output information. 37 38 <p>The output of a simple program consisting of one 39 <code>main</code> thread is: 40 <pre> 41 java.lang.ThreadGroup[name=main, maxpri=10] 42 Thread=[main,5,false] 43 </pre> 44 45 <p>The boolean value in thread information is the value returned 46 by {@link Thread#isDaemon}. 47 48 */ 49 public 50 String doRender(Object o) { 51 if(o instanceof ThreadGroup) { 52 StringBuffer sbuf = new StringBuffer(); 53 ThreadGroup tg = (ThreadGroup) o; 54 sbuf.append("java.lang.ThreadGroup[name="); 55 sbuf.append(tg.getName()); 56 sbuf.append(", maxpri="); 57 sbuf.append(tg.getMaxPriority()); 58 sbuf.append("]"); 59 Thread[] t = new Thread[tg.activeCount()]; 60 tg.enumerate(t); 61 for(int i = 0; i < t.length; i++) { 62 sbuf.append(Layout.LINE_SEP); 63 sbuf.append(" Thread=["); 64 sbuf.append(t[i].getName()); 65 sbuf.append(","); 66 sbuf.append(t[i].getPriority()); 67 sbuf.append(","); 68 sbuf.append(t[i].isDaemon()); 69 sbuf.append("]"); 70 } 71 return sbuf.toString(); 72 } else { 73 try { 74 // this is the best we can do 75 return o.toString(); 76 } catch(Exception ex) { 77 return ex.toString(); 78 } 79 } 80 } 81 }