/*
 * Copyright (c) 2011, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.util.concurrent;

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

import org.jowidgets.util.Assert;
import org.jowidgets.util.IFactory;

public final class DaemonThreadFactory implements ThreadFactory {

    private final IFactory<String> threadNameFactory;
    private final ThreadFactory defaultThreadFactory;

    public DaemonThreadFactory() {
        this((IFactory<String>) null);
    }

    public DaemonThreadFactory(final String threadNamePrefix) {
        this(new DefaultThreadNameFactory(threadNamePrefix));
    }

    public DaemonThreadFactory(final IFactory<String> threadNameFactory) {
        this.threadNameFactory = threadNameFactory;
        this.defaultThreadFactory = Executors.defaultThreadFactory();
    }

    @Override
    public Thread newThread(final Runnable runnable) {
        final Thread result = defaultThreadFactory.newThread(runnable);
        result.setDaemon(true);
        if (threadNameFactory != null) {
            result.setName(threadNameFactory.create());
        }
        return result;
    }

    private static final class DefaultThreadNameFactory implements IFactory<String> {

        private final String prefix;
        private long count;

        private DefaultThreadNameFactory(final String prefix) {
            Assert.paramNotNull(prefix, "prefix");
            this.prefix = prefix;
            this.count = 0;
        }

        @Override
        public String create() {
            return prefix + count++;
        }

    }
}