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The Apache Log4j Implementation

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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.logging.log4j.core.message;

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import org.apache.logging.log4j.message.ThreadDumpMessage;
import org.apache.logging.log4j.message.ThreadInformation;

/**
 * Factory to create extended thread information.
 */
public class ExtendedThreadInfoFactory implements ThreadDumpMessage.ThreadInfoFactory {
    public ExtendedThreadInfoFactory() {
        final Method[] methods = ThreadInfo.class.getMethods();
        boolean basic = true;
        for (final Method method : methods) {
            if (method.getName().equals("getLockInfo")) {
                basic = false;
                break;
            }
        }
        if (basic) {
            throw new IllegalStateException();
        }
    }
    @Override
    public Map createThreadInfo() {
        final ThreadMXBean bean = ManagementFactory.getThreadMXBean();
        final ThreadInfo[] array = bean.dumpAllThreads(true, true);

        final Map  threads =
            new HashMap<>(array.length);
        for (final ThreadInfo info : array) {
            threads.put(new ExtendedThreadInformation(info), info.getStackTrace());
        }
        return threads;
    }
}