com.mysql.cj.jdbc.ha.ServerAffinityStrategy Maven / Gradle / Ivy
/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
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* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
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*
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* for more details.
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package com.mysql.cj.jdbc.ha;
import java.lang.reflect.InvocationHandler;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import com.mysql.cj.jdbc.ConnectionImpl;
import com.mysql.cj.jdbc.JdbcConnection;
import com.mysql.cj.util.StringUtils;
public class ServerAffinityStrategy extends RandomBalanceStrategy {
public String[] affinityOrderedServers = null;
public ServerAffinityStrategy(String affinityOrdervers) {
super();
if (!StringUtils.isNullOrEmpty(affinityOrdervers)) {
this.affinityOrderedServers = affinityOrdervers.split(",");
}
}
@Override
public ConnectionImpl pickConnection(InvocationHandler proxy, List configuredHosts, Map liveConnections,
long[] responseTimes, int numRetries) throws SQLException {
if (this.affinityOrderedServers == null) {
return super.pickConnection(proxy, configuredHosts, liveConnections, responseTimes, numRetries);
}
Map blackList = ((LoadBalancedConnectionProxy) proxy).getGlobalBlacklist();
for (String host : this.affinityOrderedServers) {
if (configuredHosts.contains(host) && !blackList.containsKey(host)) {
ConnectionImpl conn = (ConnectionImpl) liveConnections.get(host);
if (conn != null) {
return conn;
}
try {
conn = ((LoadBalancedConnectionProxy) proxy).createConnectionForHost(host);
return conn;
} catch (SQLException sqlEx) {
if (((LoadBalancedConnectionProxy) proxy).shouldExceptionTriggerConnectionSwitch(sqlEx)) {
((LoadBalancedConnectionProxy) proxy).addToGlobalBlacklist(host);
}
}
}
}
// Failed to connect to all hosts in the affinity list. Delegate to RandomBalanceStrategy.
return super.pickConnection(proxy, configuredHosts, liveConnections, responseTimes, numRetries);
}
}