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Enables C3P0 with Hibernate connections in the GuicedPersistence provider
Requires JDK 8 and up
/*
* Distributed as part of c3p0 v.0.9.5.3
*
* Copyright (C) 2018 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.c3p0.test;
import java.util.*;
import java.sql.*;
import javax.sql.*;
import com.mchange.v2.c3p0.*;
import com.mchange.v1.db.sql.*;
public final class PSLoadPoolBackedDataSource
{
final static String INSERT_STMT = "INSERT INTO testpbds VALUES ( ? , ? )";
final static String SELECT_STMT = "SELECT count(*) FROM testpbds";
final static String DELETE_STMT = "DELETE FROM testpbds";
static DataSource ds;
public static void main(String[] argv)
{
if (argv.length > 0)
{
System.err.println( PSLoadPoolBackedDataSource.class.getName() +
" now requires no args. Please set everything in standard c3p0 config files.");
return;
}
String jdbc_url = null;
String username = null;
String password = null;
/*
if (argv.length == 3)
{
jdbc_url = argv[0];
username = argv[1];
password = argv[2];
}
else if (argv.length == 1)
{
jdbc_url = argv[0];
username = null;
password = null;
}
else
usage();
if (! jdbc_url.startsWith("jdbc:") )
usage();
*/
try
{
//DataSource ds_unpooled = DataSources.unpooledDataSource(jdbc_url, username, password);
//DataSource ds_unpooled = new FreezableDriverManagerDataSource();
DataSource ds_unpooled = DataSources.unpooledDataSource();
ds = DataSources.pooledDataSource( ds_unpooled );
//new java.io.BufferedReader(new java.io.InputStreamReader(System.in)).readLine();
Connection con = null;
Statement stmt = null;
try
{
con = ds_unpooled.getConnection();
stmt = con.createStatement();
stmt.executeUpdate("CREATE TABLE testpbds ( a varchar(16), b varchar(16) )");
}
catch (SQLException e)
{
e.printStackTrace();
System.err.println("relation testpbds already exists, or something " +
"bad happened.");
}
finally
{
StatementUtils.attemptClose( stmt );
ConnectionUtils.attemptClose( con );
}
//for (int i = 0; i < 5; ++i)
for (int i = 0; i < 100; ++i)
{
Thread t = new ChurnThread();
t.start();
System.out.println("THREAD MADE [" + i + "]");
Thread.sleep(500);
}
}
catch (Exception e)
{ e.printStackTrace(); }
}
static class ChurnThread extends Thread
{
Random random = new Random();
public void run()
{
try
{
while(true)
{
Connection con = null;
try
{
con = ds.getConnection();
int select = random.nextInt(3);
switch (select)
{
case 0:
executeSelect( con, random );
break;
case 1:
executeInsert( con, random );
break;
case 2:
executeDelete( con, random );
break;
}
//Thread.sleep(5000);
}
catch (Exception e)
{ e.printStackTrace(); }
finally
{ ConnectionUtils.attemptClose( con ); }
//Thread.sleep( random.nextInt( 1000 ) );
Thread.sleep(1);
}
}
catch (Exception e)
{ e.printStackTrace(); }
}
}
static void executeInsert(Connection con, Random random) throws SQLException
{
PreparedStatement pstmt = null;
try
{
pstmt = con.prepareStatement(INSERT_STMT);
pstmt.setInt(1, random.nextInt());
pstmt.setInt(2, random.nextInt());
pstmt.executeUpdate();
System.out.println("INSERTION");
}
finally
{
// make sure forgetting this doesn't starve
// statement cache, as long as the connection
// closes...
StatementUtils.attemptClose( pstmt );
}
}
static void executeSelect(Connection con, Random random) throws SQLException
{
long l = System.currentTimeMillis();
PreparedStatement pstmt = null;
ResultSet rs = null;
try
{
pstmt = con.prepareStatement(SELECT_STMT);
rs = pstmt.executeQuery();
rs.next(); //we assume one row, one col
System.out.println("SELECT [count=" + rs.getInt(1) + ", time=" +
(System.currentTimeMillis() - l) + " msecs]");
}
finally
{
ResultSetUtils.attemptClose( rs );
StatementUtils.attemptClose( pstmt );
}
}
static void executeDelete(Connection con, Random random) throws SQLException
{
PreparedStatement pstmt = null;
ResultSet rs = null;
try
{
pstmt = con.prepareStatement(DELETE_STMT);
int deleted = pstmt.executeUpdate();
System.out.println("DELETE [" + deleted + " rows]");
}
finally
{
ResultSetUtils.attemptClose( rs );
StatementUtils.attemptClose( pstmt );
}
}
/*
private static void usage()
{
System.err.println("java " +
"-Djdbc.drivers= " +
PSLoadPoolBackedDataSource.class.getName() +
" [ ]" );
System.exit(-1);
}
*/
}