// Copyright (c) 1999, 2000 Oracle Corporation
package oracle.jbo.common.ampool;

import java.util.*;
import oracle.jbo.*;

/**
 * This class demonstrates usage of the Application Module pool.
 * <P>
 **
 ** <a HREF="PoolTester.txt">View implementation of PoolTester</a>
 ** <P>
 * @author Juan Oropeza
 */
public class PoolTester extends Object {

  /**
   * Constructor
   */
  public PoolTester() {
  }

  public void doTest() throws Exception
  {
    Hashtable info = new Hashtable();

    info.put(JboContext.INITIAL_CONTEXT_FACTORY, JboContext.JBO_CONTEXT_FACTORY);
    info.put(JboContext.DEPLOY_PLATFORM, "LOCAL");

    PoolMgr.getInstance().createPool("TestAMPool", "package2.Package2Module" , "jdbc:oracle:thin:scott/tiger@localhost:1521:orcl", info);

    ApplicationPool pool = PoolMgr.getInstance().getPool("TestAMPool");

    ApplicationModule instance = pool.checkout();

    ApplicationModule instance2 = pool.checkout();

    pool.checkin(instance2);
    
    ApplicationModule instance3 = pool.checkout();

    PoolMgr.getInstance().removePool("TestAMPool");

    // create a pool with a custom application pool class
    PoolMgr.getInstance().createPool("CustomTestAMPool", "oracle.jbo.common.ampool.CustomPool" , "package2.Package2Module" , "jdbc:oracle:thin:scott/tiger@localhost:1521:orcl", info);

    pool = PoolMgr.getInstance().getPool("CustomTestAMPool");

    try
    {
      instance = pool.checkout();
      instance = pool.checkout();
      instance = pool.checkout();
      instance = pool.checkout();
      instance = pool.checkout();
    }
    catch(Exception ex)
    {
      ex.printStackTrace();
    }
     
  }

  /**
   * main
   * @param args
   */
  public static void main(String[] args) {
    PoolTester poolTester = new PoolTester();

    try
    {
      poolTester.doTest();
    }
    catch(Exception ex)
    {
      ex.printStackTrace();
    }
  }
}

/**
**  This is a simple application pool class that only allows checkout of 3 instances
**/
class CustomPool extends ApplicationPoolImpl
{
  public CustomPool()
  {
  }

  /**
   * checkout
   * @return oracle.jbo.ApplicationModule
   */
  public synchronized ApplicationModule checkout() throws Exception
  {
    // if the instance count > 3 throw an exception
    int nCount = getInstanceCount();

    if(nCount > 3)
    {
      throw new RuntimeException("You have exceeded the number of instances for this pool");
    }
    return super.checkout();
  }
  
}