FabricMultiTenantConnectionProvider.java
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/*
Copyright (c) 2013, 2016, 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 FOSS 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.fabric.hibernate;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.hibernate.service.jdbc.connections.spi.MultiTenantConnectionProvider;
import com.mysql.fabric.FabricCommunicationException;
import com.mysql.fabric.FabricConnection;
import com.mysql.fabric.Server;
import com.mysql.fabric.ServerGroup;
import com.mysql.fabric.ServerMode;
import com.mysql.fabric.ShardMapping;
/**
* Multi-tenancy connection provider for Hibernate 4.
*
* http://docs.jboss.org/hibernate/orm/4.1/javadocs/org/hibernate/service/jdbc/connections/spi/MultiTenantConnectionProvider.html
*/
public class FabricMultiTenantConnectionProvider implements MultiTenantConnectionProvider {
private static final long serialVersionUID = 1L;
private FabricConnection fabricConnection;
private String database;
private String table; // the sharded table
private String user;
private String password;
private ShardMapping shardMapping;
private ServerGroup globalGroup;
public FabricMultiTenantConnectionProvider(String fabricUrl, String database, String table, String user, String password, String fabricUser,
String fabricPassword) {
try {
this.fabricConnection = new FabricConnection(fabricUrl, fabricUser, fabricPassword);
this.database = database;
this.table = table;
this.user = user;
this.password = password;
this.shardMapping = this.fabricConnection.getShardMapping(this.database, this.table);
this.globalGroup = this.fabricConnection.getServerGroup(this.shardMapping.getGlobalGroupName());
} catch (FabricCommunicationException ex) {
throw new RuntimeException(ex);
}
}
/**
* Find a server with mode READ_WRITE in the given server group and create a JDBC connection to it.
*
* @returns a {@link Connection} to an arbitrary MySQL server
* @throws SQLException
* if connection fails or a READ_WRITE server is not contained in the group
*/
private Connection getReadWriteConnectionFromServerGroup(ServerGroup serverGroup) throws SQLException {
for (Server s : serverGroup.getServers()) {
if (ServerMode.READ_WRITE.equals(s.getMode())) {
String jdbcUrl = String.format("jdbc:mysql://%s:%s/%s", s.getHostname(), s.getPort(), this.database);
return DriverManager.getConnection(jdbcUrl, this.user, this.password);
}
}
throw new SQLException("Unable to find r/w server for chosen shard mapping in group " + serverGroup.getName());
}
/**
* Get a connection that be used to access data or metadata not specific to any shard/tenant.
* The returned connection is a READ_WRITE connection to the global group of the shard mapping
* for the database and table association with this connection provider.
*/
public Connection getAnyConnection() throws SQLException {
return getReadWriteConnectionFromServerGroup(this.globalGroup);
}
/**
* Get a connection to access data association with the provided `tenantIdentifier' (or shard
* key in Fabric-speak). The returned connection is a READ_WRITE connection.
*/
public Connection getConnection(String tenantIdentifier) throws SQLException {
String serverGroupName = this.shardMapping.getGroupNameForKey(tenantIdentifier);
try {
ServerGroup serverGroup = this.fabricConnection.getServerGroup(serverGroupName);
return getReadWriteConnectionFromServerGroup(serverGroup);
} catch (FabricCommunicationException ex) {
throw new RuntimeException(ex);
}
}
/**
* Release a non-shard-specific connection.
*/
public void releaseAnyConnection(Connection connection) throws SQLException {
try {
connection.close();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
/**
* Release a connection specific to `tenantIdentifier'.
*/
public void releaseConnection(String tenantIdentifier, Connection connection) throws SQLException {
releaseAnyConnection(connection);
}
/**
* We don't track connections.
*
* @returns false
*/
public boolean supportsAggressiveRelease() {
return false;
}
@SuppressWarnings("rawtypes")
public boolean isUnwrappableAs(Class unwrapType) {
return false;
}
public <T> T unwrap(Class<T> unwrapType) {
return null;
}
}