io.seldon.db.jdbc.JDBCConnectionFactory.java Source code

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Here is the source code for io.seldon.db.jdbc.JDBCConnectionFactory.java

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/*
 * Seldon -- open source prediction engine
 * =======================================
 *
 * Copyright 2011-2015 Seldon Technologies Ltd and Rummble Ltd (http://www.seldon.io/)
 *
 * ********************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ********************************************************************************************
 */

package io.seldon.db.jdbc;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

@Component
public class JDBCConnectionFactory {

    private static Logger logger = Logger.getLogger(JDBCConnectionFactory.class.getName());

    private static JDBCConnectionFactory factory;

    private Map<String, DataSource> dataSources = new ConcurrentHashMap<>();
    private Map<String, String> clientToCatalog = new ConcurrentHashMap<>();
    private InitialContext ctx;

    public JDBCConnectionFactory() {
        try {
            ctx = new InitialContext();
        } catch (NamingException e) {
            ctx = null;
            logger.error("Couldn't start JDNI context", e);
        }
        factory = this;
    }

    //   public static JDBCConnectionFactory initialise( Map<String,String> jndiKeys,Map<String,String> clientToCatalog) throws NamingException
    //   {
    //      if (factory == null)
    //         factory = new JDBCConnectionFactory();
    //
    //      for(Map.Entry<String, String> jndiKey : jndiKeys.entrySet())
    //         factory.addDataSource(ctx, jndiKey.getKey(), jndiKey.getValue(),clientToCatalog.get(jndiKey.getKey()));
    //
    //      return factory;
    //   }

    public static JDBCConnectionFactory get() {
        return factory;
    }

    public void addDataSource(String key, String jndi, String dbName) throws NamingException {
        DataSource ds = (DataSource) ctx.lookup(jndi);
        dataSources.put(key, ds);
        if (dbName != null)
            clientToCatalog.put(key, dbName);
        else
            clientToCatalog.put(key, key);
    }

    public Connection getConnection(String client) throws SQLException {
        return getConnection(client, false);
    }

    public Connection getConnection(String client, boolean readonly) throws SQLException {
        DataSource ds = dataSources.get(client);
        Connection c = null;
        if (ds != null) {
            c = ds.getConnection();
            if (readonly)
                c.setReadOnly(true);
            else
                c.setReadOnly(false);
            c.setCatalog(clientToCatalog.get(client));
        } else {
            //         logger.error("Can't get connection for client "+client);
            final String message = "Can't get connection for client " + client;
            logger.error(message, new Exception(message));
        }
        return c;
    }

}