Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *
 *  The contents of this file are subject to the Terracotta Public 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://terracotta.org/legal/terracotta-public-license.
 *
 *  Software distributed under the License is distributed on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 *  the specific language governing rights and limitations under the License.
 *
 *  The Covered Software is Terracotta Core.
 *
 *  The Initial Developer of the Covered Software is
 *  Terracotta, Inc., a Software AG company
 *
 */

import java.lang.management.ManagementFactory;

import java.lang.management.ThreadMXBean;

public class Main {
    protected static final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    protected static volatile ThreadGroup rootThreadGroup;

    /**
     * Get all threads.
     */
    public static Thread[] getAllThreads() {
        final ThreadGroup root = getRootThreadGroup();
        int alloc = threadMXBean.getThreadCount();
        int size = 0;
        Thread[] threads;
        // ThreadGroup.enumerate() will only return as many threads as it can fit in
        // the array it's given, and we have no accurate way to know how many threads
        // there will be at the time it is called.
        do {
            alloc *= 2;
            threads = new Thread[alloc];
            size = root.enumerate(threads, true);
        } while (size >= alloc);
        Thread[] trimmed = new Thread[size];
        System.arraycopy(threads, 0, trimmed, 0, size);
        return trimmed;
    }

    public static ThreadGroup getRootThreadGroup() {
        if (rootThreadGroup == null) {
            ThreadGroup tg = Thread.currentThread().getThreadGroup();
            ThreadGroup parent = tg.getParent();
            while (parent != null) {
                tg = parent;
                parent = tg.getParent();
            }
            rootThreadGroup = tg;
        }
        return rootThreadGroup;
    }
}