/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.log4j.or; import org.apache.log4j.Layout; /** Render {@link ThreadGroup} objects in a format similar to the information output by the {@link ThreadGroup#list} method. @author Ceki Gülcü @since 1.0 */ public class ThreadGroupRenderer implements ObjectRenderer { public ThreadGroupRenderer() { } /** Render a {@link ThreadGroup} object similar to the way that the {@link ThreadGroup#list} method output information.
The output of a simple program consisting of one
main
thread is:
java.lang.ThreadGroup[name=main, maxpri=10] Thread=[main,5,false]
The boolean value in thread information is the value returned by {@link Thread#isDaemon}. */ public String doRender(Object o) { if(o instanceof ThreadGroup) { StringBuffer sbuf = new StringBuffer(); ThreadGroup tg = (ThreadGroup) o; sbuf.append("java.lang.ThreadGroup[name="); sbuf.append(tg.getName()); sbuf.append(", maxpri="); sbuf.append(tg.getMaxPriority()); sbuf.append("]"); Thread[] t = new Thread[tg.activeCount()]; tg.enumerate(t); for(int i = 0; i < t.length; i++) { sbuf.append(Layout.LINE_SEP); sbuf.append(" Thread=["); sbuf.append(t[i].getName()); sbuf.append(","); sbuf.append(t[i].getPriority()); sbuf.append(","); sbuf.append(t[i].isDaemon()); sbuf.append("]"); } return sbuf.toString(); } else { // this is the best we can do return o.toString(); } } }