JAXM

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Internet Technologies 1

Internet Technologies

XML Messaging

A PowerWarning application using servlets and SAX

Asynchronous Messages using JAXM and SOAP

The PowerWarning Application is from XML andJava by Maruyama, Tamura, and Uramoto, Addison-Wesley.The JAXM example was adapted with major changes from Java Web Services by Deitel

and Deitel

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XML Messaging Part I

The PowerWarning application allows users to register

their geographical position and their temperature concerns.

Users will receive e-mail when the temperature exceeds the user

specified parameters.

This example is from

XML and Java by Maruyama, Tamura, and Uramoto, Addison-Wesley.

The web container is called Jigsaw from the W3C.

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[1]

[2]

[3] Weather Report

[4]

[5] [6] Weather Report -- White Plains, NY

[7]

[8] Date/Time11 AM EDT Sat Jul 25

1998

[9] Current Tem.70[10] Todays High82

[11] Todays Low62

[12]

[13]

[14]

Suppose that we know that the weather information is available

from the web at

http://www.xweather.com/White_Plains_NY_US.html.

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Strategy 1:

For the current temperature of White Plains, go to line 9,column 46 of the page and continue until reaching the next

ampersand.

Strategy 2:

For the current temperature of the White Plains, go to the

first tag, then go to the second tag within thetable, and then go to the second tag within the row.

Neither of these seems very appealing

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//www.xweather.com/WeatherReport.dtd>

White Plains

NY

Sat Jul 25 1998

11 AM EDT

70

82

62

XML would help

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Strategy 3:

For the current temperature of White Plains, N.Y., go

to the tag.

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XML

Mobile users

PC usersHttp://www.xweather.com

WeatherReport

application

WML

HTML

PowerWarning

application

Application

programs

XML

Email notifications

Registrations

XML

XSLT

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The XML Describing the Weather

Pittsburgh

PA

Wed. April 11, 2001

3

70

8262

This file is behind

Jigsaw in the file

Www/weather/

weather.xml.

Perhaps this isbeing served up

by www.xweather.com

for cents per hit.
http://www.xweather.com/http://www.xweather.com/

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Serving the weather// This servlet file is stored in Www/Jigsaw/servlet/GetWeather.java

// This servlet returns a user selected xml weather file from

// the Www/weather directory and returns it to the client.

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class GetWeather extends HttpServlet {

This data would not

normally be retrieved

from a file.

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public void doGet(HttpServletRequest req, HttpServletResponse res)

throws ServletException, IOException {

String theData = "";

/* For simplicity we get the users request from the path. */String extraPath = req.getPathInfo();

extraPath = extraPath.substring(1);

// read the file

try {

// open file and create a DataInputStreamFileInputStream theFile =

new FileInputStream("c:\\Jigsaw\\Jigsaw\\+Jigsaw\\Www\\weather\\"+extraPath);

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InputStreamReader is = new InputStreamReader(theFile);

BufferedReader br = new BufferedReader(is);

// read the file into the string theDataString thisLine;

while((thisLine = br.readLine()) != null) {

theData += thisLine + "\n";

}

}

catch(Exception e) {

System.err.println("Error " + e);

}

PrintWriter out = res.getWriter();out.write(theData);

System.out.println("Wrote document to client");

out.close();

}}

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XML

Mobile users


WeatherReport

application

WML

HTML

PowerWarning

application

Application

programs

XML

Email notifications

Registrations

XML

XSLT

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Registrations (HTML)

PowerWarning

E-Mail

State

City

Temperature

Duration

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Registrations (Servlet)

On servlet initialization, we will start up an object whose

responsibility it is to periodically wake up and tell the watcher

objects to check the weather.

The servlet will create a watcher object for each registered

user. The watcher object will be told of each users locationand temperature requirements. Each watcher object will run

in its own thread and may or may not notify its assigneduser by email.

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Registrations (Servlet)

/* This servlet is called by an HTML form. The form passes

the user email, state, city, temperature and duration.

*/

import java.io.*;

import java.util.*;



public class PowerWarn extends HttpServlet {

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static Hashtable userTable; /* Holds (email,watcher) pairs */

public void init(ServletConfig conf) throws ServletException {

super.init(conf);

PowerWarn.userTable = new Hashtable();Scheduler scheduler = new Scheduler();

scheduler.start(); /* Run the scheduler */

} /* The scheduler can see the hash

table. It has package access.*/

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public void doPost(HttpServletRequest req, HttpServletResponse res)

throws ServletException, IOException {

/* Collect data from the HTML form */

String par_user = req.getParameter("User");

String par_state = req.getParameter("State");

String par_city = req.getParameter("City");

int par_temp = Integer.parseInt(

req.getParameter("Temperature"));

int par_duration = Integer.parseInt(req.getParameter("Duration"));

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/* Assign a watcher to this user. */

Watcher watcher = new Watcher(par_user, par_state, par_city,

par_temp, par_duration);

/* Place the (email,watcher) pair in the hash table. */

PowerWarn.userTable.put(par_user, watcher);

res.setContentType("text/html");

PrintWriter writer = res.getWriter();

writer.print(" +You'll be notified by email");writer.close();

}

}

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[email protected]

[email protected]

PowerWarn.userTable

User

data

User

data

Watcher

Watcher

Scheduler

Http Request

Http Request

Email

Email

Servlet

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The Schedulerimport java.util.Enumeration;

public class Scheduler extends Thread {

public void run() {

System.out.println("Running scheduler");

while(true) {

Enumeration en = PowerWarn.userTable.elements();

while(en.hasMoreElements()) {Watcher wa = (Watcher)en.nextElement();

new Thread(wa).start();

}

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try { /* put this thread to sleep for 15 seconds */

Thread.sleep(1000 * 15);

}catch(InterruptedException ie) {

// ignore

}

} /* end while */

}

public Scheduler() {

super();}

}

Fifteen seconds fortesting.

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The Watcher Class

The Watcher objects make HTTP requests to get XML.

SAX.

JavaMail.

How should we handle the XML? SAX or DOM?

How do we send email?

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import org.xml.sax.*;

import org.xml.sax.helpers.ParserFactory;

import java.io.*;import java.net.*;

import org.w3c.dom.Document;

import javax.xml.parsers.SAXParserFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

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public class Watcher extends HandlerBase implements Runnable {

String user, state, city;

int temp, duration, overTemp;

public Watcher(String user, String state, String city, int temp,

int duration) {

super();

this.user = user;

this.state = state;

this.city = city;

this.temp = temp;

this.duration = duration;

this.overTemp = 0;

}

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public void run() { // called by scheduler

System.out.println("Running watcher");

/* Set up to call the weather service. */

String weatheruri =

http://mccarthy.heinz.cmu.edu:8001/servlet/GetWeather+/weather.xml";

/* For simplicity we wont take the appropriate approach. *//* String weatheruri =

"http://mccarthy.heinz.cmu.edu:8001/servlet/GetWeather/?city="

+ URLEncoder.encode(this.city);*/

/* Create an InputSource object for the parser to use. */

InputSource is = new InputSource(weatheruri);
http://mccarthy.heinz.cmu.edu:8001/servlet/GetWeatherhttp://mccarthy.heinz.cmu.edu:8001/servlet/GetWeather

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try { /* Set up to handle incoming XML */

SAXParserFactory factory = SAXParserFactory.newInstance();

factory.setValidating(true);

SAXParser parser = factory.newSAXParser();parser.parse(is, this); /* The parser makes the calls. */

}


e.printStackTrace();

return;}

/* The parsing and callbacks are done by this time. */

int currentTempNumber;

try {

currentTempNumber = Integer.parseInt(this.currentTemp.trim());

}

catch( NumberFormatException e) {e.printStackTrace(); return; }

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/* See if the user wants to be alerted. */

if(currentTempNumber > this.temp) {

this.overTemp++;

if(this.overTemp >= this.duration) {warning();

}

}

else {

this.overTemp = 0;}

}

/* Send email via JavaMail. The Mailer class is based on the JavaMail API. */

public void warning() {

System.out.println("Sending email");

Mailer mailman = new Mailer(this.user,

"[email protected]", "It's hot");

mailman.send();

}

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/* Handle SAX events. */

StringBuffer buffer;

String currentTemp;

public void startDocument() throws SAXException {

this.currentTemp = null;

}

public void startElement(String name, AttributeList aMap) throws SAXException {

if(name.equals("CurrTemp")) { /* Prepare for next event. */

this.buffer = new StringBuffer();

}}

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public void endElement(String name) throws SAXException {

if(name.equals("CurrTemp")) {

this.currentTemp = this.buffer.toString();

this.buffer = null;

}

}

public void characters(char[] ch, int start, int length) throws SAXException {

if(this.buffer != null) this.buffer.append(ch,start,length);

}

}

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XML

Mobile users


WeatherReport

application

WML

HTML

PowerWarning

application

Application

programs

XML

Email notifications

Registrations

XML

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XML Messaging JAXM

We

enter

twonumbers

to be

added.

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We hear

back right

away that

the computationwill be performed.

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Check

another

page to

see if

our

computation

has been

completed.

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BrowserTwo numbers HTTP Servlet

DoCalculationServlet

Feedback to browser

right away

JAXM Message Provider

JAXM Message Provider

JAXM Servlet

CalculationHandler

JAXM Servlet

ResultHandler

ResultHolder.java

BrowserHTTPServletGetResultsAsHTML

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Configure the Provider

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With a URI

we

name

the provider

A URL

Is the

Provider

location

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Set the classpath

.;

d:\jwsdp-1_0_01\common\lib\jaxm-api.jar;

d:\jwsdp-1_0_01\common\lib\jaxm-runtime.jar;

d:\jwsdp-1_0_01\services\jaxm-provider;

d:\jwsdp-1_0_01\services\jaxm-provideradmin;

d:\jwsdp-1_0_01\common\lib\saaj-api.jar;

d:\jwsdp-1_0_01\common\lib\saaj-ri.jar;d:\jwsdp-1_0_01\common\lib\dom4j.jar;

d:\jwsdp-1_0_01\common\lib\activation.jar;

d:\jwsdp-1_0_01\common\lib\mail.jar;

d:\jwsdp-1_0_01\common\lib\commons-logging.jar;

d:\jwsdp-1_0_01\common\lib\jaxp-api.jar;

d:\jwsdp-1_0_01\common\endorsed\dom.jar;

d:\jwsdp-1_0_01\common\endorsed\sax.jar;

d:\jwsdp-1_0_01\common\endorsed\xalan.jar;

d:\jwsdp-1_0_01\common\endorsed\xercesImpl.jar;

d:\jwsdp-1_0_01\common\endorsed\xsltc.jar;

d:\xerces\xmlParserAPIs.jar;

d:\jwsdp-1_0_01\common\lib\servlet.jar;

d:\jwsdp-1_0_01\common\lib\soap.jar;

d:\jwsdp-1_0_01\common\lib\providerutil.jar

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Provide two client.xml files

urn:edu.cmu.andrew.mm6.serverProvider

http://127.0.0.1:8080/jaxmasync/servercode/CalculationHandler

http://java.sun.com/xml/jaxm/provider

http://127.0.0.1:8081/jaxm-provider/sender

On the server side

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urn:edu.cmu.andrew.mm6.clientProvider

http://127.0.0.1:8080/jaxmasync/clientcode/ResultHandler

http://java.sun.com/xml/jaxm/provider

http://127.0.0.1:8081/jaxm-provider/sender

On the client side

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Client Side DirectoriesD:\McCarthy\www\95-733\examples\jaxmasync\clientcode>tree

|

build

WEB-INF classes libdocs

srcweb index.htmlWEB-INFweb.xml

| classes client.xml|build.properties

|build.xml

DoCalculationServlet.javaGetResultAsHTML.java

ResultHandler.java

ResultHolder.java

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Client Side Web.xml

GetDataFromHTML


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HandleResult

ResultHandler

HTMLServlet

GetResultAsHTML

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HTMLServlet/GetResultAsHTML/*

GetDataFromHTML

/DoCalculationServlet/*

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HandleResult

/ResultHandler/*

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Server Side web.xml

HandleCalc

CalculationHandler

HandleCalc

/CalculationHandler/*

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Feedback to browser

right away

JAXM Provider

JAXM Provider

JAXM Servlet

CalculationHandler

JAXM Servlet

ResultHandler

ResultHolder.java


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Server Side

CalculationHandler.java// CalculationHandler.java -- Called by provider// -- Get values from message

// -- Perform addition and send a message to provider

import java.net.*;

import java.io.*;

import java.util.*;



import javax.xml.messaging.*;import javax.xml.soap.*;

import javax.activation.*;

import com.sun.xml.messaging.jaxm.ebxml.*;

import org.apache.commons.logging.*;im ort ava.math.*

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public class CalculationHandler extends JAXMServlet implements

OnewayListener {

private static final boolean deBug = true;

private ProviderConnection serverProvider;private MessageFactory messageFactory;

private String from;

private String to;

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public void init(ServletConfig config) throws ServletException {

super.init(config);

try {

// get a connection to the client provider

ProviderConnectionFactory providerFactory =

ProviderConnectionFactory.newInstance();

serverProvider = providerFactory.createConnection();

// Establish 'from' and 'to' URN's to be placed within the

// outgoing message.// The provider must know how these names map to URL's

// via the Provider

// Administration tool.

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from = "urn:edu.cmu.andrew.mm6.serverProvider";

ProviderMetaData metaData = serverProvider.getMetaData();

String[] profiles = metaData.getSupportedProfiles();

boolean isProfileSupported = false;

for(int i = 0; i < profiles.length; i++)

if(profiles[i].equals("ebxml")) isProfileSupported = true;

if(isProfileSupported) {

// Build an EBXML style message factory

messageFactory = serverProvider.createMessageFactory("ebxml")

if(deBug)

System.out.println("Server side init complete with no problem");

}

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else

throw new ServletException("CalculationHandler +

Profile problem" + new Date());}catch(Exception e) {

throw new ServletException(

"CalculationHandler Problems in init()" + e + new Date());

}

}

bli id ( )

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public void onMessage(SOAPMessage reqMessage)

{

if(deBug) System.out.println("Hit onMessage() big time " +

new Date());// Build SOAP document to return to the sender

try {

if(deBug) {

System.out.println("The following is the message received by CalculationHandler onMessage");

reqMessage.writeTo(System.out);

}

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EbXMLMessageImpl resMessage = new

EbXMLMessageImpl(reqMessage);

to = "urn:edu.cmu.andrew.mm6.clientProvider";

resMessage.setSender(new Party(from));

resMessage.setReceiver(new Party(to));

Iterator i = resMessage.getAttachments();AttachmentPart operand1 = (AttachmentPart) i.next();

AttachmentPart operand2 = (AttachmentPart) i.next();

String op1 = (String)(operand1.getContent());String op2 = (String)(operand2.getContent());

BigInteger o1 = new BigInteger(op1);

BigInteger o2 = new BigInteger(op2);

BigInteger result = o1.add(o2);

String answer = result.toString();

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AttachmentPart answerPart = resMessage.createAttachmentPart();

answerPart.setContent(answer, "text/plain");

resMessage.addAttachmentPart(answerPart);

serverProvider.send(resMessage);

if(deBug) System.out.println(

"CalculationHandler: Message sent back to + clientProvider");}

catch(IOException ioe) {

System.out.println("JAXM exception thrown " + ioe); }

catch(JAXMException je) {System.out.println("JAXM exception thrown " + je); }

catch(SOAPException se) {

System.out.println("Soap exception thrown " + se); }

}}

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Feedback to browser

right away

JAXM Provider

JAXM Provider

JAXM Servlet

CalculationHandler

JAXM Servlet

ResultHandler

ResultHolder.java


HTTP S l t

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HTTP Servlet


// DoCalculation.java -- Get values from client browser

// -- Send SOAP request to ClientProvider Asynchronously

import java.net.*;

import java.io.*;

import java.util.*;



import javax.xml.messaging.*;import javax.xml.soap.*;



import org.apache.commons.logging.*;

// N l l t C ll t d t f th b d SOAP

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// Normal servlet. Collects data from the browser, sends a SOAP message

// to a JAXM provider and does not wait for a response. Sends an HTML

// note of confirmation back to the browser.

public class DoCalculationServlet extends HttpServlet {

private ProviderConnection clientProvider;

private MessageFactory messageFactory;

private String from;

private String to;



super.init(config);

if(deBug) System.out.println(

"Running at the top of client side html form init" + new Date());

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try {




clientProvider = providerFactory.createConnection();

// Establish 'from' and 'to' URN's to be placed within the// outgoing message.

// The provider must know how these names map to

// URL's via the Provider


from = "urn:edu.cmu.andrew.mm6.clientProvider";

to = "urn:edu.cmu.andrew.mm6.serverProvider";

ProviderMetaData metaData = clientProvider.getMetaData();

i fil d fil ()

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for(int i = 0; i < profiles.length; i++) {

if(profiles[i].equals("ebxml")) isProfileSupported = true;}

if(isProfileSupported) {

// Build an EBXML style message factory

messageFactory = clientProvider.createMessageFactory("ebxml");

} else

throw new ServletException("Runtime Profile problem" +

new Date());

}catch(Exception e) {

throw new ServletException("Run Time Problem in +DoCalculationServlet init()" + e + new Date());

}}

public void doPost(HttpServletRequest req

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public void doPost(HttpServletRequest req,

HttpServletResponse response)

throws ServletException,

IOException{

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String finalString = "";

String op1 = req.getParameter("op1");

String op2 = req.getParameter("op2");

// Build SOAP document to send to the provider

try {

EbXMLMessageImpl message = (EbXMLMessageImpl)

messageFactory.createMessage

message.setSender(new Party(from));

R i ( P ( ))

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message.setReceiver(new Party(to));

AttachmentPart operand1 = message.createAttachmentPart();

operand1.setContent(op1, "text/plain");

AttachmentPart operand2 = message.createAttachmentPart();operand2.setContent(op2, "text/plain");

message.addAttachmentPart(operand1);

message.addAttachmentPart(operand2);

clientProvider.send(message);

}

catch(JAXMException je) { System.out.println("JAXM exception thrown " + je); }

catch(SOAPException se) { System.out.println(

"Soap exception thrown " + se); }

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String docType = "\n";

out.println(docType +"\n" +

"Request Response" + "" +

"\n" +

"\n" +" Sent Calculation Request to Local Provider \n" +

"" + op1 + "+" + op2 + " will be computed\n" +

"");

}

}

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Feedback to browser

right away

JAXM Provider

JAXM Provider

JAXM Servlet

CalculationHandler

JAXM Servlet

ResultHandler

ResultHolder.java


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JAXM Servlet ResultHandler// ResultHandler.java -- Called by provider// -- Get result from message

// -- Write result to a shared object or RDBMS

import java.net.*;

import java.io.*;import java.util.*;



import javax.xml.messaging.*;

import javax.xml.soap.*;



import org.apache.commons.logging.*;

import java.math.*;

public class ResultHandler extends JAXMServlet

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public class ResultHandler extends JAXMServlet

implements OnewayListener {

private static final boolean deBug = true;private ProviderConnection clientProvider;

private MessageFactory messageFactory;

String from, to;


super.init(config);

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try {




clientProvider = providerFactory.createConnection();

// Establish 'from' and 'to' URN's to be placed within// the outgoing message.

// The provider must know how these names map to URL's

// via the Provider


from = "urn:edu.cmu.andrew.mm6.clientProvider";

ProviderMetaData metaData = clientProvider.getMetaData();



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for(int i = 0; i < profiles.length; i++)

if(profiles[i].equals("ebxml")) isProfileSupported = true;

if(isProfileSupported) {// Build an EBXML style message factory

messageFactory = clientProvider.createMessageFactory("ebx

}

else

throw new ServletException("ResultHandler OnewayListener + Profile problem" + new Date());

}


throw new ServletException("ResultHandler OnewayListener+ Problems in init()" + e + new Date( }

}

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public void onMessage(SOAPMessage inMessage)

{

try {if(deBug) { System.out.println("Message received from +

server appears now");inMessage.writeTo(System.out);

}// Read the data from the SOAP document

EbXMLMessageImpl resultMessage = new

EbXMLMessageImpl(inMessage);

Iterator i = resultMessage.getAttachments();



AttachmentPart result = (AttachmentPart) i.next();

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String op1 = (String)(operand1.getContent());

String op2 = (String)(operand2.getContent());

String res = (String)(result.getContent());

// Place the result in a shared object.

ResultHolder singleTon = ResultHolder.getInstance();

singleTon.setLastResult(op1 + " + " + op2 + " = " + res);

}


System.out.println("onMessage in ResultHandler exception " + e);}

}

}

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Feedback to browser

right away

JAXM Provider

JAXM Provider

JAXM Servlet

CalculationHandler

JAXM Servlet

ResultHandler

ResultHolder.java

Browser

HTTPServletGetResultsAsHTML

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ResultHolder.javapublic class ResultHolder {

private String lastResult;

private static ResultHolder instance = new ResultHolder();

private ResultHolder() {

lastResult = "";}

public static ResultHolder getInstance() { return instance; }

synchronized public String getLastResult() { return lastResult; }

synchronized public void setLastResult(String result) { lastResult= result; }

synchronized public String toString() { return lastResult; }

}

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Feedback to browser

right away

JAXM Provider

JAXM Provider

JAXM Servlet

CalculationHandler

JAXM Servlet

ResultHandler

ResultHolder.java

Browser

HTTPServletGetResultsAsHTML

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GetResultsAsHTML

// GetResultAsHTML.java -- Get result from ResultHolder object

// -- Send it back to client as HTML

import java.net.*;

import java.io.*;

import java.util.*;import javax.servlet.http.*;


public class GetResultAsHTML extends HttpServlet {



super.init(config);

bli id d G t (Htt S l tR t

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public void doGet (HttpServletRequest req,

HttpServletResponse response)

throws ServletException,

IOException{

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String finalString = ResultHolder.getInstance().toString();

String docType = "

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out.println(docType +

"\n" +

"

GetResultAsHTML Response" + "" +"\n" +

"\n" +

" Most Recent Calculation \n" +

"" + finalString + "\n" +"");

}

}

JAXM

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Transcript of JAXM