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

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

/**
 **  This WebBean provides information regarding the current contents of the application module pool. You can use it
 **  in order to peek at the contents of the application pool.
 **
 ** <a HREF="PoolAdministrator.txt">View implementation of PoolAdministrator</a>
 ** <P>
 ** @author Juan Oropeza
 **/
public class PoolAdministrator extends WebBeanImpl
{
  /**
   * Constructor
   */
  public PoolAdministrator() {
  }

  /**
  **  Reports pool information in an HTML format.
  **/
  public void reportPoolContents(HTMLDocument doc , ApplicationPool pool)
  {
    int nInstances = pool.getInstanceCount();

    doc.addElement(new HTMLTextElement("<HR>"));
    doc.addHeader(2, "Pool Name:" + pool.getPoolName());
    doc.skipLine(1);
    doc.addHeader(2, "Number of instances:" + nInstances);
    doc.skipLine(1);

    HTMLTable table = new HTMLTable();

    HTMLTableRow  row = new HTMLTableRow();
    doc.addElement(table);

    
    row = new HTMLTableRow();
    table.addRow(row);
    row.addTextCell("Connect String");
    row.addTextCell(pool.getConnectString());

    row = new HTMLTableRow();
    table.addRow(row);
    row.addTextCell("Application Module Class");
    row.addTextCell(pool.getApplicationModuleClass());

    for(int i = 0; i < nInstances ; i++)
    {
      ApplicationModule am = pool.getInstance(i);

      if(pool.isAvailable(am))
        doc.addHeader(3, "Instance #" + i + " Available(Yes)");
      else
        doc.addHeader(3, "Instance #" + i + " Available(No)");
    }

  }

  /**
  **  Renders Application Pool information to JSP page.
  **/
  public void render()
  {
    try
    {
      HTMLDocument doc = new HTMLDocument();

      PoolMgr mgr = PoolMgr.getInstance();

      Enumeration e = mgr.getPools();
      
      while(e.hasMoreElements())
      {
        ApplicationPool pool = (ApplicationPool)e.nextElement();
        reportPoolContents(doc, pool);
      }

      doc.render(out);
    }
    catch(Exception ex)
    {
      throw new RuntimeException(ex.getMessage());
    }
  }
  
}