org.apache.log4j.or.ThreadGroupRenderer Maven / Gradle / Ivy
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/*
* 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 {
try {
// this is the best we can do
return o.toString();
} catch (Exception ex) {
return ex.toString();
}
}
}
}