/*
 * The MIT License
 *
 * Copyright 2013 Jesse Glick.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package hudson.util;

import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Thread factory that sets thread name so we know who is responsible for so many threads being created.
 * @since 1.541
 */
public final class NamingThreadFactory implements ThreadFactory {

    private final AtomicInteger threadNum = new AtomicInteger();
    private final ThreadFactory delegate;
    private final String name;

    /**
     * Creates a new naming factory.
     * @param delegate a baseline factory, such as {@link Executors#defaultThreadFactory} or {@link DaemonThreadFactory} or {@link ExceptionCatchingThreadFactory}
     * @param name an identifier to be used in thread names; might be e.g. your {@link Class#getSimpleName}
     */
    public NamingThreadFactory(ThreadFactory delegate, String name) {
        this.delegate = delegate;
        this.name = name; // TODO consider uniquifying this
    }

    @Override public Thread newThread(Runnable r) {
        Thread t = delegate.newThread(r);
        t.setName(name + " [#" + threadNum.incrementAndGet() + "]");
        return t;
    }

}
