/**
 * Licensed to Jasig under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Jasig licenses this file to you 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.
 */

package org.jasig.schedassist.impl;

import java.util.LinkedList;
import java.util.List;

/**
 * Source: http://code.google.com/p/ehcache-spring-annotations/ 
 * 
 * @author Eric Dalquist
 * @version $Id: ThreadGroupRunner.java $
 */
public class ThreadGroupRunner {

	private final List<Thread> threads = new LinkedList<Thread>();

	private final String namePrefix;
	private final boolean daemon;

	public ThreadGroupRunner(String namePrefix, boolean daemon) {
		this.namePrefix = namePrefix;
		this.daemon = daemon;
	}

	/**
	 * Add a Runnable that will be executed in its own thread.
	 */
	public synchronized void addTask(Runnable r) {
		final Thread t = new Thread(r , this.namePrefix + threads.size());
		t.setDaemon(this.daemon);
		threads.add(t);
	}


	public synchronized void addTask(int threadCount, Runnable r) {
		for (int index = 0; index < threadCount; index++) {
			this.addTask(r);
		}
	}

	/**
	 * Start all threads (start is in order of added runnable)
	 */
	public synchronized void start() {
		for (final Thread t : this.threads) {
			t.start();
		}
	}

	/**
	 * Join on all threads (join is in order of added runnable)
	 */
	public synchronized void join() throws InterruptedException {
		for (final Thread t : this.threads) {
			t.join();
		}
	}
}