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Enables C3P0 with Hibernate connections in the GuicedPersistence provider Requires JDK 8 and up
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/*
 * 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 OneThreadRepeatedInsertOrQueryTest
{
    final static String INSERT_STMT = "INSERT INTO testpbds VALUES ( ? , ? )";
    final static String SELECT_STMT = "SELECT count(*) FROM testpbds";

    static Random random = new Random();
    static DataSource ds;

    public static void main(String[] argv)
    {
	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);
		ds = DataSources.pooledDataSource( ds_unpooled );

		Connection con = null;
		Statement stmt = null;

		try
		    {
			con = ds.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 );
		    }

		while(true)
		    {
			con = null;
			try
			    {
				con = ds.getConnection();
				boolean select = random.nextBoolean();
				if (select)
				    executeSelect( con );
				else
				    executeInsert( con );
			    }
			catch (Exception e)
			    { e.printStackTrace(); }
			finally
			    { ConnectionUtils.attemptClose( con ); }
			
			//Thread.sleep( random.nextInt( 1000 ) );
		    }
	    }
	catch (Exception e)
	    { e.printStackTrace(); }
    }

    static void executeInsert(Connection con) 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) 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 );
	    }
    }

    private static void usage()
    {
	System.err.println("java " +
			   "-Djdbc.drivers= " +
			   OneThreadRepeatedInsertOrQueryTest.class.getName() +
			   "  [ ]" );
	System.exit(-1);
    }
}