org.mariadb.jdbc.internal.protocol.MastersSlavesProtocol Maven / Gradle / Ivy
/*
*
* 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,
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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*/
package org.mariadb.jdbc.internal.protocol;
import org.mariadb.jdbc.HostAddress;
import org.mariadb.jdbc.UrlParser;
import org.mariadb.jdbc.internal.failover.FailoverProxy;
import org.mariadb.jdbc.internal.failover.impl.MastersSlavesListener;
import org.mariadb.jdbc.internal.failover.tools.SearchFilter;
import org.mariadb.jdbc.internal.util.pool.GlobalStateInfo;
import java.sql.SQLException;
import java.util.*;
import java.util.concurrent.locks.ReentrantLock;
public class MastersSlavesProtocol extends MasterProtocol {
protected boolean masterConnection = false;
private boolean mustBeMasterConnection = false;
public MastersSlavesProtocol(final UrlParser url, final GlobalStateInfo globalInfo, final ReentrantLock lock) {
super(url, globalInfo, lock);
}
/**
* 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(MastersSlavesListener listener, final GlobalStateInfo globalInfo,
final List addresses, SearchFilter searchFilter) throws SQLException {
MastersSlavesProtocol protocol;
ArrayDeque loopAddresses = new ArrayDeque(addresses);
if (loopAddresses.isEmpty()) resetHostList(listener, loopAddresses);
int maxConnectionTry = listener.getRetriesAllDown();
SQLException lastQueryException = null;
boolean firstLoop = true;
while (!loopAddresses.isEmpty() || (!searchFilter.isFailoverLoop() && maxConnectionTry > 0)) {
protocol = getNewProtocol(listener.getProxy(), globalInfo, listener.getUrlParser());
if (listener.isExplicitClosed() || (!listener.isSecondaryHostFailReconnect() && !listener.isMasterHostFailReconnect())) {
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());
if (listener.isMasterHostFailReconnect() && protocol.isMasterConnection()) {
if (foundMaster(listener, protocol, searchFilter)) {
return;
}
} else if (listener.isSecondaryHostFailReconnect() && !protocol.isMasterConnection()) {
if (foundSecondary(listener, protocol, searchFilter)) {
return;
}
} else {
protocol.close();
}
} catch (SQLException e) {
lastQueryException = e;
listener.addToBlacklist(protocol.getHostAddress());
}
if (!listener.isMasterHostFailReconnect() && !listener.isSecondaryHostFailReconnect()) {
return;
}
//in case master not found but slave is , and allowing master down
if (loopAddresses.isEmpty()
&& (listener.isMasterHostFailReconnect()
&& listener.urlParser.getOptions().allowMasterDownConnection
&& !listener.isSecondaryHostFailReconnect())) {
return;
}
// if server has try to connect to all host, and there is remaining master or slave that 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 (listener.isMasterHostFailReconnect() || listener.isSecondaryHostFailReconnect()) {
String error = "No active connection found for replica";
if (listener.isMasterHostFailReconnect()) {
error = "No active connection found for master";
}
if (lastQueryException != null) {
throw new SQLException(error + " : " + lastQueryException.getMessage(),
lastQueryException.getSQLState(), lastQueryException.getErrorCode(), lastQueryException);
}
throw new SQLException(error);
}
}
/**
* Reinitialize loopAddresses with all servers in randomize order.
*
* @param listener current listener
* @param loopAddresses the list to reinitialize
*/
private static void resetHostList(MastersSlavesListener 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);
//remove current connected hosts to avoid reconnect them
servers.removeAll(listener.connectedHosts());
loopAddresses.clear();
loopAddresses.addAll(servers);
}
protected static boolean foundMaster(MastersSlavesListener listener, MastersSlavesProtocol protocol,
SearchFilter searchFilter) {
protocol.setMustBeMasterConnection(true);
if (listener.isMasterHostFailReconnect()) {
listener.foundActiveMaster(protocol);
} else {
protocol.close();
}
if (!listener.isSecondaryHostFailReconnect()) {
return true;
} else {
if (listener.isExplicitClosed()
|| searchFilter.isFineIfFoundOnlyMaster()
|| !listener.isSecondaryHostFailReconnect()) {
return true;
}
}
return false;
}
protected static boolean foundSecondary(MastersSlavesListener listener, MastersSlavesProtocol protocol,
SearchFilter searchFilter) throws SQLException {
protocol.setMustBeMasterConnection(false);
if (listener.isSecondaryHostFailReconnect()) {
listener.foundActiveSecondary(protocol);
} else {
protocol.close();
}
if (!listener.isMasterHostFailReconnect()) {
return true;
} else {
if (listener.isExplicitClosed()
|| searchFilter.isFineIfFoundOnlySlave()
|| !listener.isMasterHostFailReconnect()) {
return true;
}
}
return false;
}
/**
* Get new instance of MastersSlavesProtocol.
*
* @param proxy proxy
* @param urlParser connection string Object.
* @return a new MastersSlavesProtocol instance
*/
private static MastersSlavesProtocol getNewProtocol(FailoverProxy proxy, final GlobalStateInfo globalInfo, UrlParser urlParser) {
MastersSlavesProtocol newProtocol = new MastersSlavesProtocol(urlParser, globalInfo, proxy.lock);
newProtocol.setProxy(proxy);
return newProtocol;
}
public boolean mustBeMasterConnection() {
return mustBeMasterConnection;
}
public void setMustBeMasterConnection(boolean mustBeMasterConnection) {
this.mustBeMasterConnection = mustBeMasterConnection;
}
}
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