RE: multi-thread: http and IO port

Dear Charles - Re: "My current problem: I want to start a multi-thread
program. it should listen to port 80 as a HTTP server , and by the mean
while , it check an IO port and do
some IO command."

OK; Here is the body of code for a a "Device Controller Servlet", that
controls an LED on a TINI with the BitPort class.  This servlet is used by
Shawn Silverman's bullet-proof TINI Tynamo Web-Server.   Also, take a look
at Ted Kosan's on-line (FREE!) Java course, Chapter 7 - "Lecture 7 - Arrays,
Threads and Polymorphism (V1.02)";  The URL is:

http://javadevices.org/javacourses/index.html

Also refer to:  "Lecture 6 - Exceptions, Sockets, Streams and Web Servers
(V1.04) "

Best regards, Kelly Smith    *** Watch out for line-wrap on the code below,
since your email will probably wrap long text lines! ***

package com.qindesign.servlet.example;

import com.dalsemi.system.BitPort;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/**
 * DeviceControllerServlet.
 *
 * Shows how a system can display a Web page and respond when a user
 * clicks a link that sends information to the servlet.
 *
 * The Web page enables users to monitor and control two LEDs on a Dallas
Semiconductor
 * DSTINI390, Dallas Semiconductor DSTINIm400, or a  Systronix TStik400
module.
 *
 * Tested with the Tynamo Web server (http://tynamo.qindesign.com) and
DSTINI390, DSTINIm400
 * module (http://www.dalsemi.com), as well as the Systronix TStik400
(http://www.systronix.com).
 *
 * The servlet's Web page contains links to the following image files:
 *   red-led-on.gif
 *   red-led-off.gif
 *   green-led-on.gif
 *   green-led-off.gif
 *   red-button-right.gif
 *   green-button-right.gif
 *
 * Before deploying the servlet to the DSTINI390, DSTINIm400 or TStik400,
YOU MUST do the
 * following:
 *
 * If using the default webserver.props file, store the image files in the
 * http-root directory under Tynamo's home directory on the development
 * computer. (Or edit webserver.props to specify a different directory and
store
 * the files there.)
 *
 * Edit the provided build.properties file to include the locations of this
 * DeviceControllerServlet.java file and the DSTINI390, DSTINIm400  or
TStik400
 * installation on your development computer.
 *
 * For more on compiling the servlet and deploying it to a DSTINI390,
DSTINIm400 or TStik400,
 * see http://tynamo.qindesign.com.
 *
 * Other embedded Ethernet and Internet code and resources are available
from www.Lvr.com.
 *
 * @author Jan Axelson (Adapted from the original DeviceController).
 *			http://www.Lvr.com (Lakeview Research)
 * @author Shawn Silverman (Adapted from the original DeviceController).
 *			http://tynamo.qindesign.com/ (QIN Design)
 * @version 1.2 - Modified December 20, 2003 by Kelly Smith. Added display
of Telnet
 *                session "ON/OFF" LED state.
 * @version 1.1 - Modified December 12, 2003 by Kelly Smith. Added support
for DSTINI390.
 * @author Kelly Smith.Email: [email protected]
 *
 * References:
 *
 * http://tynamo.qindesign.com/docs/ajile/index.html
 * http://www.lvr.com/eeccode.htm
 */

public class DeviceControllerServlet extends HttpServlet
{
  // led1 is included on the Dallas Semiconductor DSTINIm400 and Systronix
TStik400 board.
  // led2 is an optional LED to be added and controlled in a similar way at
port 5, bit 3.
// DSTINI390: P5.2, C1RX, RXD1, DS2480 RX, "serial 1", pin 19. DSTINIm400:
P5.2, T3, LED
  BitPort led1 = new BitPort(BitPort.Port5Bit2);
// DSTINI390: P5.3, C1TX, TXD1, DS2480 TX, "serial 1", pin 18. DSTINIm400:
P5.3: available, connect for Net Boot jumper
  BitPort led2 = new BitPort(BitPort.Port5Bit3);
  // led1 is included on the Dallas Semiconductor DSTINI390 board.
// DSTINI390: P3.5, T1, INTOW (Internal 1-Wire), LED pin 11. DSTINIm400400:
P3.5, T1, CLKO
  BitPort led1_TINI = new BitPort(BitPort.Port3Bit5);

  /**
   * The initial state for the LEDS is off.
   *
   * @throws ServletException
   */
  public void init() throws ServletException {

    // A logic high (set) turns the corresponding LED off for a
DSTINIm400400/TStik400 board.
    led1.set();
    // A logic low (clear) turns the corresponding LED off for a DSTINI390
board.
	led1_TINI.clear();
    // A logic high (set) turns the corresponding LED off for a
DSTINIm400400/TStik400 board.
    led2.set();
  } // end init

  /**
   * Responds to HTTP GET requests.
   *
   * @param request the HTTPServletRequest object
   * @param response the HttpServletResponse object
   *
   * @throws ServletException
   * @throws IOException
   */
  public void doGet(HttpServletRequest request, HttpServletResponse
response)
      throws ServletException, IOException
  {
    //The query string sent by the client tells which button was clicked on
the Web page.
    String query = request.getQueryString();

	// Initialize the LED states.
    boolean led1On; 		// DSTINIm400400/TStik400 board.
    boolean led1Toggled;
	led1Toggled=false;
	boolean led1On_TINI;	// DSTINI390 board.
	boolean led2On; 		// DSTINIm400400/TStik400 board.
    boolean led2Toggled;
	led2Toggled=false;

    // Read the current state of the LEDs (0=on, 1=off).
    // and toggle the LED named in the query string.

    if ("button1".equals(query)) {
		// 1.2 - Modified December 18, 2003 by Kelly Smith. Added Telnet "ON/OFF"
LED state.
		System.out.print("The Red Button 1 was clicked:");

	// Toggle Red LED 1.
	// A logic low turns the LED 1 on.
	led1On = toggle(led1); 		// DSTINIm400400/TStik400 board.
	// A logic low turns the LED 1 off.
	led1On = toggle(led1_TINI);	// DSTINI390 board.
	led1Toggled=true;
    } else {

	// Don't toggle Red LED 1.
	led1Toggled=false;
	led1On_TINI = (led1_TINI.readLatch() != 0);
    }
    if ("button2".equals(query)) {
		// 1.2 - Modified December 18, 2003 by Kelly Smith. Added Telnet "ON/OFF"
LED state.
		System.out.print("The Green Button 2 was clicked:");

	// Toggle Green LED 2.
	// A logic low turns the LED 2 on.
	led2On = toggle(led2); 		// DSTINIm400400/TStik400 board.
	led2Toggled=true;
    } else {

	// Don't toggle Green LED 2.
	led2Toggled=false;
    }

    // Set the images and text to match the current LEDs' 1 state.
    // If led1State is true, LED1 is off.
    String led1Image;
    String led1State;

	// Read the current LED1 hardware state and test the On/Off state.
	led1On = (led1.readLatch() == 0);

    if (led1On) {
		led1Image= "/red-led-on.gif";
		led1State = "ON";
	if (led1Toggled) {
		System.out.println(" ON");
    }
    else { }
    }
    else {
      led1Image = "/red-led-off.gif";
      led1State = "OFF";
	if (led1Toggled) {
		System.out.println(" OFF");
    }
    else { }
   }
    // Set the images and text to match the current LEDs' 2 state.
    // If led2State is false, LED2 is off.
    String led2Image;
    String led2State;

	// Read the current LED2 hardware state and test the On/Off state.
	led2On = (led2.readLatch() == 0);

    if (led2On) {
		led2Image= "/green-led-on.gif";
		led2State = "ON";
	if (led2Toggled) {
		System.out.println(" ON");
    }
    else { }
    }
    else {
		led2Image = "/green-led-off.gif";
		led2State = "OFF";
	if (led2Toggled) {
		System.out.println(" OFF");
    }
    else { }
	}
    // Return the Web page to the client.
    SendWebPage (response, led1Image, led2Image,
                 led1State, led2State);
  } //end doGet

  /**
   * Toggles the specified bitPort bit and returns the new state.
   *
   * @param bitPort a bit that controls an LED.
   */

  private static boolean toggle(BitPort bitPort) {
    if (bitPort.readLatch() == 0) {

      // If it's 0, set the bit to turn the LED off and return true.
      bitPort.set();
      return true;
    } else {

      // If it's 1, clear the bit to turn the LED on and return false.
      bitPort.clear();
      return false;
    }
  } // end toggle

  /**
   * Sends a Web page to the output stream.
   *
   * @param response the HttpServletResponse object
   * @param led1Image name of an image file
   * @param led2Image name of an image file
   * @param led1State "on" or "off"
   * @param led2State "on" or "off"
   *
   * @throws IOException
   */
  private void SendWebPage (HttpServletResponse response,
                            String led1Image, String led2Image,
                            String led1State, String led2State)
      throws IOException {

    // Write the Web page to the client.
    // Add an escape character (\) before all quotes (") within the HTML
code
    // (but not before the quotes required at the beginning and end
    // of each out.print statement).
    // When writing to the output stream, concatenate string constants with
"+",
    // to minimize the number of writes to the output stream while keeping
the code
    // readable and because there is no performance penalty.

    // Set the Content-Type field in the HTML header.
    response.setContentType("text/html");

    //Use a ServletOutputStream object to write the page.
    ServletOutputStream out = response.getOutputStream();

    // Write the page's contents to the output stream.
    // Place the LED and button images in a table so they line up.
    // The variables led1Image and led2Image each contain a file name,
    // either "ledon.gif" or "ledoff.gif", as appropriate.
    out.print("<html>"
              + "<head><title>DSTINI390/DSTINIm400/TStik400 LED1 and LED2
Device Controller</title></head>"
              + "<style>body{font-family:
Verdana,sans-serif}</style></head>"
              + "<body>"
              + "<h1>LED1 and LED2 Device Controller</h1>"
              + "<table><tr><td>"
              +"<img src=\"");
    out.print(led1Image);
    out.print("\">"
              + "</td>"
              + "<td>"
              + "<img src=\"");
    out.print(led2Image);
    out.print("\">"
              + "</td>"
              + "</tr>");

    // /servlet/DeviceControllerServlet is the mapping that identifies
    // DeviceControllerServlet as the DeviceControllerServlet servlet, as
    // specified in the servlets.props file.
    // button1 or button2 is the query string returned to the DSTINI390,
DSTINIm400
    // or TStik400 when the user clicks corresponding Red or Green LED
button.
    out.print("<tr>"
              + "<td>"
              + "<a href=\"/servlet/DeviceControllerServlet?button1\"><img
SRC=\"/red-button-right.gif\"></a>"
              + "</td>"
              + "<td>"
              + "<a href=\"/servlet/DeviceControllerServlet?button2\"><img
SRC=\"/green-button-right.gif\" ></a>"
              + "</td>"
              + "</tr>"
              + "</table>"
              + "<p>Red LED 1 is ");
    out.print (led1State);

    // Send text that matches the LEDs' states.
    out.print(".</p>"
              + "<p>Green LED 2 is ");
    out.print (led2State);
    out.print(".</p>"
              + "<p>Click a button to turn an LED on or off.</p>"
              + "<p>The web page will update to show the current states of
the LEDs.</p>"
              + "</body>"
              + "</html>");
    // The servlet container closes the output stream when the request has
been
    // serviced, so there's no need to do it here.
  } // end SendWebPage

  /**
   * Gets information about this servlet.
   */
  public String getServletInfo()
  {
    return "Device ControllerServlet";
  } // end getServletInfo

} // end DeviceControllerServlet

-----Original Message-----
From: tini-admin-6tN4nzCoH/[email protected] [mailto:[email protected]]On Behalf Of
Charles Chao Wang
Sent: Thursday, April 15, 2004 3:44 PM
To: tini-6tN4nzCoH/[email protected]
Subject: [TINI]multi-thread: http and IO port


Hi,

Thank you guys for the response of CAN baud rate problem. Now CAN bus is
working. :)

My current problem: I want to start a multi-thread program. it should listen
to
port 80 as a HTTP server , and by the mean while , it check an IO port and
do
some IO command.

I have finished both parts of the code and tested it, they are working. But
I
do not know how to put them together by multi-thread way. Is there any code
I
can read to learn something?

BTW, I am using TiniM400 and TiniS400 and Java.

Thanks in advance.

Charles




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