content: /**
   *  Licensed to the Apache Software Foundation (ASF) under one or more
   *  contributor license agreements.  See the NOTICE file distributed with
   *  this work for additional information regarding copyright ownership.
   *  The ASF licenses this file to You under the Apache License, Version 2.0
   *  (the "License"); you may not use this file except in compliance with
   *  the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package org.apache.aries.samples.ariestrader.web.prims;
  
  import java.io.IOException;
  import java.io.PrintWriter;
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpSession;
  
  import org.apache.aries.samples.ariestrader.util.Log;
  
  /**
   * 
   * PingHTTPSession3 tests the servers ability to manage 
   * and persist large HTTPSession data objects. The servlet creates the large custom 
   * java object {@link PingSession3Object}. This large session object is 
   * retrieved and stored to the session on each user request.  The default settings
   * result in approx 2024 bits being retrieved and stored upon each request.
   *
   */
  public class PingSession3 extends HttpServlet {
  	private static int NUM_OBJECTS = 2;
  	private static String initTime = null;
  	private static int hitCount = 0;
  
  /**
   * forwards post requests to the doGet method
   * Creation date: (11/6/2000 10:52:39 AM)
   * @param res javax.servlet.http.HttpServletRequest
   * @param res2 javax.servlet.http.HttpServletResponse
   */
  public void doPost(HttpServletRequest req, HttpServletResponse res)
  	throws ServletException, IOException {
  	doGet(req, res);
  }
  /**
  * this is the main method of the servlet that will service all get requests.
  * @param request HttpServletRequest
  * @param responce HttpServletResponce
  **/
  public void doGet(HttpServletRequest request, HttpServletResponse response)
  	throws ServletException, IOException {
  
  	PrintWriter out = response.getWriter();
  	//Using a StringBuffer to output all at once.
  	StringBuffer outputBuffer = new StringBuffer();
  	HttpSession session = null;
  	PingSession3Object[] sessionData;
  	response.setContentType("text/html");
  
  	//this is a general try/catch block.  The catch block at the end of this will forward the responce
  	//to an error page if there is an exception
  	try
  	{
  
  		try
  		{
  			session = request.getSession(true);
  		}
  		catch (Exception e)
  		{
  			Log.error(e, "PingSession3.doGet(...): error getting session"); 
  			//rethrow the exception for handling in one place.
  			throw e;
  
  		}
  		// Each PingSession3Object in the PingSession3Object array is 1K in size
  		// NUM_OBJECTS sets the size of the array to allocate and thus set the size in KBytes of the session object
  		// NUM_OBJECTS can be initialized by the servlet
  		// Here we check for the request parameter to change the size and invalidate the session if it exists
  		// NOTE: Current user sessions will remain the same (i.e. when NUM_OBJECTS is changed, all user thread must be restarted
  		// for the change to fully take effect
  
  		String num_objects;
  		if ((num_objects = request.getParameter("num_objects")) != null)
  		{
  			//validate input
  			try
  			{
  				int x = Integer.parseInt(num_objects);
  				if (x > 0)
  				{
  					NUM_OBJECTS = x;
  				}
  			}
  			catch (Exception e)
  			{
  				Log.error(e, "PingSession3.doGet(...): input should be an integer, input=" + num_objects); 
  			} //  revert to current value on exception
  
  			outputBuffer.append(
  				"<html><head> Session object size set to "
  					+ NUM_OBJECTS
  					+ "K bytes </head><body></body></html>"); 
  			if (session != null)
  				session.invalidate();
  			out.print(outputBuffer.toString());
  			out.close();
  			return;
  		}
  
  		// Get the session data value
  		sessionData = 
  			(PingSession3Object[]) session.getAttribute("sessiontest.sessionData"); 
  		if (sessionData == null)
  		{
  			sessionData = new PingSession3Object[NUM_OBJECTS];
  			for (int i = 0; i < NUM_OBJECTS; i++)
  			{
  				sessionData[i] = new PingSession3Object();
  			}
  		}
  
  		session.setAttribute("sessiontest.sessionData", sessionData);
  
  		//Each PingSession3Object is about 1024 bits, there are 8 bits in a byte.
  		int num_bytes = (NUM_OBJECTS*1024)/8;
  		response.setHeader(
  			"SessionTrackingTest-largeSessionData", 
  			num_bytes + "bytes"); 
  
  		outputBuffer
  			.append("<html><head><title>Session Large Data Test</title></head><body><HR><BR><FONT size=\"+2\" color=\"#000066\">HTTP Session Test 3: Large Data<BR></FONT><FONT size=\"+1\" color=\"#000066\">Init time: ")
  			.append(initTime)
  			.append("</FONT><BR><BR>");
                  hitCount++;
  		outputBuffer.append("<B>Hit Count: ").append(hitCount).append(
  			"<BR>Session object updated. Session Object size = "
  				+ num_bytes
  				+ " bytes </B></body></html>"); 
  		//output the Buffer to the printWriter.
  		out.println(outputBuffer.toString());
  
  	}
  	catch (Exception e)
  	{
  		//log the exception
  		Log.error(e, "PingSession3.doGet(..l.): error."); 
  		//set the server response to 500 and forward to the web app defined error page 
  		response.sendError(
  			500, 
  			"PingSession3.doGet(...): error. " + e.toString()); 	}
  }
  /** 
   * returns a string of information about the servlet
   * @return info String: contains info about the servlet
   **/
  public String getServletInfo()
  {
  	return "HTTP Session Object: Tests management of a large custom session class";
  }    
  /**
  * called when the class is loaded to initialize the servlet
  * @param config ServletConfig:
  **/
  public void init(ServletConfig config) throws ServletException {
  	super.init(config);
  	hitCount = 0;
  	initTime = new java.util.Date().toString();
  
  }
  }