001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.log4j.or; 019 020import org.apache.log4j.Layout; 021 022 023/** 024 Render {@link ThreadGroup} objects in a format similar to the 025 information output by the {@link ThreadGroup#list} method. 026 @author Ceki Gülcü 027 @since 1.0 */ 028public class ThreadGroupRenderer implements ObjectRenderer { 029 030 public 031 ThreadGroupRenderer() { 032 } 033 034 /** 035 Render a {@link ThreadGroup} object similar to the way that the 036 {@link ThreadGroup#list} method output information. 037 038 <p>The output of a simple program consisting of one 039 <code>main</code> thread is: 040 <pre> 041 java.lang.ThreadGroup[name=main, maxpri=10] 042 Thread=[main,5,false] 043 </pre> 044 045 <p>The boolean value in thread information is the value returned 046 by {@link Thread#isDaemon}. 047 048 */ 049 public 050 String doRender(Object o) { 051 if(o instanceof ThreadGroup) { 052 StringBuffer sbuf = new StringBuffer(); 053 ThreadGroup tg = (ThreadGroup) o; 054 sbuf.append("java.lang.ThreadGroup[name="); 055 sbuf.append(tg.getName()); 056 sbuf.append(", maxpri="); 057 sbuf.append(tg.getMaxPriority()); 058 sbuf.append("]"); 059 Thread[] t = new Thread[tg.activeCount()]; 060 tg.enumerate(t); 061 for(int i = 0; i < t.length; i++) { 062 sbuf.append(Layout.LINE_SEP); 063 sbuf.append(" Thread=["); 064 sbuf.append(t[i].getName()); 065 sbuf.append(","); 066 sbuf.append(t[i].getPriority()); 067 sbuf.append(","); 068 sbuf.append(t[i].isDaemon()); 069 sbuf.append("]"); 070 } 071 return sbuf.toString(); 072 } else { 073 try { 074 // this is the best we can do 075 return o.toString(); 076 } catch(Exception ex) { 077 return ex.toString(); 078 } 079 } 080 } 081}