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JDBC driver for MariaDB and MySQL
/*
*
* MariaDB Client for Java
*
* Copyright (c) 2012-2014 Monty Program Ab.
* Copyright (c) 2015-2019 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.protocol;
import org.mariadb.jdbc.*;
import org.mariadb.jdbc.internal.failover.*;
import org.mariadb.jdbc.internal.failover.tools.*;
import org.mariadb.jdbc.internal.util.pool.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import java.util.concurrent.locks.*;
public class MasterProtocol extends AbstractQueryProtocol implements Closeable {
/**
* Get a protocol instance.
*
* @param urlParser connection URL infos
* @param globalInfo server global variables information
* @param lock the lock for thread synchronisation
*/
public MasterProtocol(
final UrlParser urlParser, final GlobalStateInfo globalInfo, final ReentrantLock lock) {
super(urlParser, globalInfo, lock);
}
/**
* Get new instance.
*
* @param proxy proxy
* @param urlParser url connection object
* @return new instance
*/
private static MasterProtocol getNewProtocol(
FailoverProxy proxy, final GlobalStateInfo globalInfo, UrlParser urlParser) {
MasterProtocol newProtocol = new MasterProtocol(urlParser, globalInfo, proxy.lock);
newProtocol.setProxy(proxy);
return newProtocol;
}
/**
* loop until found the failed connection.
*
* @param listener current failover
* @param globalInfo server global variables information
* @param addresses list of HostAddress to loop
* @param searchFilter search parameter
* @throws SQLException if not found
*/
public static void loop(
Listener listener,
final GlobalStateInfo globalInfo,
final List addresses,
SearchFilter searchFilter)
throws SQLException {
MasterProtocol protocol;
ArrayDeque loopAddresses = new ArrayDeque<>(addresses);
if (loopAddresses.isEmpty()) {
resetHostList(listener, loopAddresses);
}
int maxConnectionTry = listener.getRetriesAllDown();
boolean firstLoop = true;
SQLException lastQueryException = null;
while (!loopAddresses.isEmpty() || (!searchFilter.isFailoverLoop() && maxConnectionTry > 0)) {
protocol = getNewProtocol(listener.getProxy(), globalInfo, listener.getUrlParser());
if (listener.isExplicitClosed()) {
return;
}
maxConnectionTry--;
try {
HostAddress host = loopAddresses.pollFirst();
if (host == null) {
loopAddresses.addAll(listener.getUrlParser().getHostAddresses());
host = loopAddresses.pollFirst();
}
protocol.setHostAddress(host);
protocol.connect();
if (listener.isExplicitClosed()) {
protocol.close();
return;
}
listener.removeFromBlacklist(protocol.getHostAddress());
listener.foundActiveMaster(protocol);
return;
} catch (SQLException e) {
listener.addToBlacklist(protocol.getHostAddress());
lastQueryException = e;
}
// if server has try to connect to all host, and master still fail
// add all servers back to continue looping until maxConnectionTry is reached
if (loopAddresses.isEmpty() && !searchFilter.isFailoverLoop() && maxConnectionTry > 0) {
resetHostList(listener, loopAddresses);
if (firstLoop) {
firstLoop = false;
} else {
try {
// wait 250ms before looping through all connection another time
Thread.sleep(250);
} catch (InterruptedException interrupted) {
// interrupted, continue
}
}
}
}
if (lastQueryException != null) {
throw new SQLException(
"No active connection found for master : " + lastQueryException.getMessage(),
lastQueryException.getSQLState(),
lastQueryException.getErrorCode(),
lastQueryException);
}
throw new SQLException("No active connection found for master");
}
/**
* Reinitialize loopAddresses with all hosts : all servers in randomize order without connected
* host.
*
* @param listener current listener
* @param loopAddresses the list to reinitialize
*/
private static void resetHostList(Listener listener, Deque loopAddresses) {
// if all servers have been connected without result
// add back all servers
List servers = new ArrayList<>();
servers.addAll(listener.getUrlParser().getHostAddresses());
Collections.shuffle(servers);
loopAddresses.clear();
loopAddresses.addAll(servers);
}
}