2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
30 package mircoders.global;
32 import java.sql.Connection;
33 import java.sql.Driver;
34 import java.util.Properties;
36 import mir.config.MirPropertiesConfiguration;
37 import org.apache.commons.dbcp.ConnectionFactory;
38 import org.apache.commons.dbcp.DriverConnectionFactory;
39 import org.apache.commons.dbcp.PoolableConnection;
40 import org.apache.commons.dbcp.PoolableConnectionFactory;
41 import org.apache.commons.pool.ObjectPool;
42 import org.apache.commons.pool.impl.GenericObjectPool;
44 public class DatabaseEngine {
45 private ObjectPool connectionPool;
47 public DatabaseEngine() {
48 MirPropertiesConfiguration configuration = MirPropertiesConfiguration.instance();
50 Properties connectionProperties = new Properties();
51 connectionProperties.put("user", configuration.getString("Database.Username"));
52 connectionProperties.put("password", configuration.getString("Database.Password"));
53 String dbHost = configuration.getString("Database.Host");
54 String dbPort = configuration.getString("Database.Port");
55 String dbName = configuration.getString("Database.Name");
56 String dbUrl = "jdbc:postgresql://"+dbHost+":"+dbPort+"/"+dbName+"?compatible=7.1";
57 String dbDriver = configuration.getString("Database.Driver");
60 driver = (Driver) (Class.forName(dbDriver)).newInstance();
62 catch (ClassNotFoundException e) {
63 throw new Error("JDBC Driver not found: " + e.toString());
65 catch (InstantiationException e) {
66 throw new Error("Can't instantiate JDBC Driver: " + e.toString());
68 catch (IllegalAccessException e) {
69 throw new Error("No access to JDBC Driver: " + e.toString());
72 connectionPool = new GenericObjectPool(null);
73 ConnectionFactory rawConnectionFactory =
74 new DriverConnectionFactory(driver, dbUrl, connectionProperties);
75 new PoolableConnectionFactory(rawConnectionFactory, connectionPool,
76 null, "select now()", false, true);
78 // test the connection right before someone borrows it
79 ((GenericObjectPool) connectionPool).setTestOnBorrow(true);
85 * Obtain a database connection
87 public Connection obtainConnection() throws Exception {
88 return (Connection) connectionPool.borrowObject();
92 * release a previously obtained database connection
94 public void releaseConnection(Connection aConnection) throws Exception {
95 connectionPool.returnObject(aConnection);
99 * Returns the native connection of a previously obtained connection
101 public Connection getNativeConnection(Connection aConnection) {
102 return ((PoolableConnection) aConnection).getDelegate();
105 public String getStatus() {
107 connectionPool.getNumActive() + " / " +
108 (connectionPool.getNumIdle()+connectionPool.getNumActive()) +