Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Entity Essentials -- A Component-based Entity System
 *
 * Copyright (C) 2015 Elmar Schug <elmar.schug@jayware.org>,
 *                    Markus Neubauer <markus.neubauer@jayware.org>
 *
 *     This file is part of Entity Essentials.
 *
 *     Entity Essentials is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU Lesser General Public License
 *     as published by the Free Software Foundation, either version 3 of
 *     the License, or any later version.
 *
 *     Entity Essentials is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *     Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

public class Main {
    public static Thread[] getAllThreadsInGroup(String groupName) {
        return getAllThreadsInGroup(getThreadGroupByName(groupName));
    }

    public static Thread[] getAllThreadsInGroup(ThreadGroup group) {
        if (group != null) {
            int nAlloc = group.activeCount();
            int n = 0;
            Thread[] threads;

            do {
                nAlloc *= 2;
                threads = new Thread[nAlloc];
                n = group.enumerate(threads);
            } while (n == nAlloc);

            return java.util.Arrays.copyOf(threads, n);
        }

        return new Thread[0];
    }

    public static ThreadGroup getThreadGroupByName(String name) {
        if (name != null) {
            final ThreadGroup[] groups = getAllThreadGroups();
            for (ThreadGroup group : groups) {
                if (group.getName().equals(name)) {
                    return group;
                }
            }
        }

        return null;
    }

    public static ThreadGroup[] getAllThreadGroups() {
        final ThreadGroup root = getRootThreadGroup();

        int nAlloc = root.activeGroupCount();
        int n = 0;
        ThreadGroup[] groups;

        do {
            nAlloc *= 2;
            groups = new ThreadGroup[nAlloc];
            n = root.enumerate(groups, true);
        } while (n == nAlloc);

        ThreadGroup[] allGroups = new ThreadGroup[n + 1];
        allGroups[0] = root;
        System.arraycopy(groups, 0, allGroups, 1, n);

        return allGroups;
    }

    public static ThreadGroup getRootThreadGroup() {
        ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
        ThreadGroup parentThreadGroup;

        while ((parentThreadGroup = threadGroup.getParent()) != null) {
            threadGroup = parentThreadGroup;
        }

        return threadGroup;
    }
}