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package com.elephantdrummer.executor.engine;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Copyright 2018 Elephant Software Klaudiusz Wojtkowiak e-mail: [email protected]
 * 
 * Licensed under the Apache 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://www.apache.org/licenses/LICENSE-2.0 
 *  
 *  Unless required by applicable law or agreed to in writing, software 
 *  distributed under the License is distributed on an "AS IS" BASIS, 
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 *  See the License for the specific language governing permissions and 
 *  limitations under the License. 
 */
public class DrummerFactoryBuilder {
	
	private String namePrefix = null;
	private boolean daemon = false;
	private int priority = Thread.NORM_PRIORITY;

	public DrummerFactoryBuilder setNamePrefix(String namePrefix) {
		if (namePrefix == null) {
			throw new NullPointerException();
		}
		this.namePrefix = namePrefix;
		return this;
	}

	public DrummerFactoryBuilder setDaemon(boolean daemon) {
		this.daemon = daemon;
		return this;
	}

	public DrummerFactoryBuilder setPriority(int priority) {
//		if (priority = "%s")
//				priority=Thread.MIN_PRIORITY));
//		}

		if (priority > Thread.MAX_PRIORITY) {
			throw new IllegalArgumentException(String.format(
					"Thread priority (%s) must be <= %s", priority,
					Thread.MAX_PRIORITY));
		}

		this.priority = priority;
		return this;
	}

	public ThreadFactory build() {
		return build(this);
	}

	private static ThreadFactory build(DrummerFactoryBuilder builder) {
		final String namePrefix = builder.namePrefix;
		final Boolean daemon = builder.daemon;
		final Integer priority = builder.priority;

		final AtomicLong count = new AtomicLong(0);

		return new ThreadFactory() {
			
			@Override
			public Thread newThread(Runnable runnable) {
				Thread thread = new Thread(runnable);
				if (namePrefix != null) {
					thread.setName(namePrefix + "-" + count.getAndIncrement());
				}
				if (daemon != null) {
					thread.setDaemon(daemon);
				}
				if (priority != null) {
					thread.setPriority(priority);
				}
				return thread;
			}
		};
	}


}