/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Written by Doug Lea with assistance from members of JCP JSR-166

 * Expert Group and released to the public domain, as explained at

 * http://creativecommons.org/publicdomain/zero/1.0/

 */

package java.util.concurrent;

/**

 * An object that creates new threads on demand.  Using thread factories

 * removes hardwiring of calls to {@link Thread#Thread(Runnable) new Thread},

 * enabling applications to use special thread subclasses, priorities, etc.

 *

 * <p>

 * The simplest implementation of this interface is just:

 * <pre> {@code

 * class SimpleThreadFactory implements ThreadFactory {

 *   public Thread newThread(Runnable r) {

 *     return new Thread(r);

 *   }

 * }}</pre>

 *

 * The {@link Executors#defaultThreadFactory} method provides a more

 * useful simple implementation, that sets the created thread context

 * to known values before returning it.

 * @since 1.5

 * @author Doug Lea

 */

public interface ThreadFactory {

    /**

     * Constructs a new {@code Thread}.  Implementations may also initialize

     * priority, name, daemon status, {@code ThreadGroup}, etc.

     *

     * @param r a runnable to be executed by new thread instance

     * @return constructed thread, or {@code null} if the request to

     *         create a thread is rejected

     */

    Thread newThread(Runnable r);

}