/*
  Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program 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 for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA

 */
package com.mysql.jdbc;

import java.lang.ref.Reference;
import com.mysql.jdbc.NonRegisteringDriver.ConnectionPhantomReference;

public class AbandonedConnectionCleanupThread extends Thread {
	private static boolean running = true;
	private static Thread threadRef = null;

	public AbandonedConnectionCleanupThread() {
		super("Abandoned connection cleanup thread");
	}

	public void run() {
		threadRef = this;
		threadRef.setContextClassLoader(null);
		while (running) {
			try {
				Reference<? extends ConnectionImpl> ref = NonRegisteringDriver.refQueue.remove(100);
				if (ref != null) {
					try {
						((ConnectionPhantomReference) ref).cleanup();
					} finally {
						NonRegisteringDriver.connectionPhantomRefs.remove(ref);
					}
				}

			} catch (Exception ex) {
				// no where to really log this if we're static
			}
		}
	}

	public static void shutdown() throws InterruptedException {
		running = false;
		if (threadRef != null) {
			threadRef.interrupt();
			threadRef.join();
			threadRef = null;
		}
	}

}