org.mariadb.jdbc.internal.failover.thread.FailoverLoop Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of mariadb-java-client-jre7 Show documentation
JDBC driver for MariaDB and MySQL for java 7
The newest version!
/*
 *
 * MariaDB Client for Java
 *
 * Copyright (c) 2012-2014 Monty Program Ab.
 * Copyright (c) 2015-2017 MariaDB Ab.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this library; if not, write to Monty Program Ab [email protected].
 *
 * This particular MariaDB Client for Java file is work
 * derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
 * the following copyright and notice provisions:
 *
 * Copyright (c) 2009-2011, Marcus Eriksson
 *
 * 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 driver nor the names of its contributors may not 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.mariadb.jdbc.internal.failover.thread;

import org.mariadb.jdbc.internal.failover.Listener;
import org.mariadb.jdbc.internal.failover.tools.SearchFilter;

import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class FailoverLoop extends TerminableRunnable {

    private static final ConcurrentLinkedQueue queue = new ConcurrentLinkedQueue<>();

    public FailoverLoop(ScheduledExecutorService scheduler) {
        super(scheduler, 1, 1, TimeUnit.SECONDS);
    }

    public static void addListener(Listener listener) {
        queue.add(listener);
    }

    public static void removeListener(Listener listener) {
        queue.remove(listener);
    }

    @Override
    protected void doRun() {
        Listener listener;
        while (!isUnschedule() && (listener = queue.poll()) != null) {
            if (!listener.isExplicitClosed() && listener.hasHostFail() && listener.canRetryFailLoop()) {
                try {
                    SearchFilter filter = listener.getFilterForFailedHost();
                    filter.setFailoverLoop(true);
                    listener.reconnectFailedConnection(filter);
                    if (listener.hasHostFail() && !listener.isExplicitClosed()) {
                        queue.add(listener);
                    }

                    //reconnection done !
                } catch (Exception e) {
                    //FailoverLoop search connection failed
                    queue.add(listener);
                }
            }
        }
    }

}