http.dhtml.systemInfo
Class SystemInfo

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          http.dhtml.systemInfo.SystemInfo

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class SystemInfo
extends javax.servlet.http.HttpServlet

A servlet demonstrating the browser callback framework, using a persistent http connection.

This servlets subscribes to messages in xmlBlaster, which are requested from the browser, currently 'cpuinfo' and 'meminfo' messages.
You see in your browser two bars displaying the current load of the xmlBlaster.org web server.
Inside the browser the bars are updated with DHTML.

If you want to do something similar, you can use this as a base for your application.

See xmlBlaster/demo/http/README for further informations

See Also:

Serialized Form

Field Summary

private static java.util.logging.Logger	log
private static java.lang.String	ME

Constructor Summary

SystemInfo()

Method Summary

void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Subscribes to xmlBlaster messages 'cpuinfo' and 'meminfo'.
void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) dummy
void	htmlOutput(java.lang.String htmlData, javax.servlet.http.HttpServletResponse response) Returns a HTML file to the Browser.
void	init(javax.servlet.ServletConfig conf) This method is invoked only once when the servlet is started.
void	popupError(javax.servlet.http.HttpServletResponse response, java.lang.String error) Report an error to the browser, which displays it in an alert() message.
void	xmlOutput(java.lang.String xmlData, javax.servlet.http.HttpServletResponse response) Send XML-Data to browser.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ME

private static final java.lang.String ME

See Also:

Constant Field Values

log

private static java.util.logging.Logger log

Constructor Detail

SystemInfo

public SystemInfo()

Method Detail

init

public void init(javax.servlet.ServletConfig conf)
          throws javax.servlet.ServletException

This method is invoked only once when the servlet is started.

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Parameters:

conf - init parameter of the servlet

Throws:

javax.servlet.ServletException

doPost

public void doPost(javax.servlet.http.HttpServletRequest request,
                   javax.servlet.http.HttpServletResponse response)
            throws javax.servlet.ServletException

dummy

Overrides:

doPost in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
                  javax.servlet.http.HttpServletResponse response)
           throws javax.servlet.ServletException

Subscribes to xmlBlaster messages 'cpuinfo' and 'meminfo'.

The message updates are received asynchronous over the callbackFrame.
The return from this doGet() may be ignored

Invoking example:
"/servlet/SystemInfo?ActionType=cpuinfo"

Overrides:

doGet in class javax.servlet.http.HttpServlet

Parameters:

request -

response -

Throws:

javax.servlet.ServletException

htmlOutput

public void htmlOutput(java.lang.String htmlData,
                       javax.servlet.http.HttpServletResponse response)
                throws javax.servlet.ServletException

Returns a HTML file to the Browser.

Parameters:

htmlData - the complete HTML page

response - the servlet response-object

Throws:

javax.servlet.ServletException

See Also:

HttpServletResponse

popupError

public void popupError(javax.servlet.http.HttpServletResponse response,
                       java.lang.String error)

Report an error to the browser, which displays it in an alert() message.

Parameters:

sessionId - The browser

error - The text to display

xmlOutput

public void xmlOutput(java.lang.String xmlData,
                      javax.servlet.http.HttpServletResponse response)
               throws javax.servlet.ServletException

Send XML-Data to browser. The browser needs to handle the data.

Parameters:

xmlData - XML data

response - servlet response

Throws:

javax.servlet.ServletException