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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tuscany.das.rdb.dbconfig;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
public class DBConnectionHelper {
private static final Logger logger = Logger.getLogger(DBConnectionHelper.class);
protected DBConnectionHelper(){
if(logger.isDebugEnabled()) {
logger.log(Level.DEBUG, "DBConnectionHelper()");
}
}
/**
* Basic validation of Config for connection information and call to
* connection helper to establish database connection. Connection using
* DriverManager or DataSource are supported.
*
*/
public static Connection createConnection(ConnectionInfo connectionInfo) {
if (logger.isDebugEnabled()) {
logger.log(Level.DEBUG, "DBConnectionHelper.createConnection(ConnectionInfo)");
}
if (connectionInfo == null ||
(connectionInfo.getDataSource() == null && connectionInfo.getConnectionProperties() == null)) {
throw new RuntimeException("No connection has been provided and no data source has been specified");
}
if(connectionInfo.getDataSource() != null && connectionInfo.getConnectionProperties() != null){
throw new RuntimeException("Use either dataSource or ConnectionProperties. Can't use both !");
}
Connection connection = null;
if(connectionInfo.getConnectionProperties() != null){
connection = initializeDriverManagerConnection(connectionInfo);
}else{
connection = initializeDatasourceConnection(connectionInfo);
}
return connection;
}
/**
* Initializes a DB connection on a managed environmet (e.g inside Tomcat)
*/
private static Connection initializeDatasourceConnection(ConnectionInfo connectionInfo){
if (logger.isDebugEnabled()) {
logger.log(Level.DEBUG, "DBConnectionHelper.initializeDatasourceConnection(ConnectionInfo)");
}
InitialContext ctx;
Connection connection;
try {
ctx = new InitialContext();
} catch (NamingException e) {
throw new RuntimeException(e);
}
try {
DataSource ds = (DataSource) ctx.lookup(connectionInfo.getDataSource());
try {
connection = ds.getConnection();
if (connection == null) {
throw new RuntimeException("Could not obtain a Connection from DataSource");
}
connection.setAutoCommit(true);
} catch (SQLException e) {
throw new RuntimeException(e);
}
} catch (NamingException e) {
throw new RuntimeException(e);
}
if( logger.isDebugEnabled()) {
logger.log(Level.DEBUG, "DBConnectionHelper.initializeDatasourceConnection() exit");
}
return connection;
}
/**
* Initialize a DB connection on a J2SE environment
* For more info, see http://java.sun.com/j2se/1.3/docs/guide/jdbc/getstart/drivermanager.html
*/
private static Connection initializeDriverManagerConnection(ConnectionInfo connectionInfo) {
if (logger.isDebugEnabled()) {
logger.log(Level.DEBUG, "DBConnectionHelper.initializeDriverManagerConnection(ConnectionInfo)");
}
if (connectionInfo.getConnectionProperties() == null) {
throw new DataSourceInitializationException("No existing context and no connection properties");
}
if (connectionInfo.getConnectionProperties().getDriverClass() == null) {
throw new DataSourceInitializationException("No jdbc driver class specified!");
}
Connection connection;
try {
//initialize driver and register it with DriverManager
Class.forName(connectionInfo.getConnectionProperties().getDriverClass());
//prepare to initialize connection
String databaseUrl = connectionInfo.getConnectionProperties().getDatabaseURL();
String userName = connectionInfo.getConnectionProperties().getUserName();
String userPassword = connectionInfo.getConnectionProperties().getPassword();
int loginTimeout = connectionInfo.getConnectionProperties().getLoginTimeout();
DriverManager.setLoginTimeout(loginTimeout);
if( (userName == null || userName.length() ==0) && (userPassword == null || userPassword.length()==0) ){
//no username or password suplied
connection = DriverManager.getConnection(databaseUrl);
}else{
connection = DriverManager.getConnection(databaseUrl, userName, userPassword);
}
if(connection == null){
throw new DataSourceInitializationException("Error initializing connection : null");
}
connection.setAutoCommit(true);
}catch(ClassNotFoundException cnf){
throw new DataSourceInitializationException("JDBC Driver '" + connectionInfo.getConnectionProperties().getDriverClass() + "' not found", cnf);
}catch(SQLException sqle){
throw new DataSourceInitializationException(sqle.getMessage(), sqle);
}
if (logger.isDebugEnabled()) {
logger.log(Level.DEBUG, "DBConnectionHelper.initializeDriverManagerConnection() exit");
}
return connection;
}
}
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