Stateful SOAP Webservices with Java and PHP

Stateful SOAP Webservices with Java and PHP
International PHP Conference 2008 – Spring Edition
Thorsten Rinne

Introduction

❙ Thorsten Rinne
❙ 31 years old
❙ Graduated in computer science
❙ Project manager at Mayflower GmbH, Munich
❙ Reporting applications
❙ Critical bank applications
❙ PHP Consulting
❙ PHP software development since 1999
❙ Founder and main developer of Open Source FAQ-
management software phpMyFAQ since 2001
❙ Zend Certified Engineer (PHP 5)

Stateful SOAP Webservices
© MAYFLOWER GmbH 2008 2

Summary

❙ Introduction
❙ SOAP and PHP
❙ Stateful SOAP Webservices
❙ Implemention
❙ Real world example
❙ Questions and answers


What is SOAP?

❙ SOAP is a protocol for exchanging XML-based messages
over computer networks
❙ It uses HTTP, HTTPS or SMTP
❙ SOAP is the successor of XML-RPC
❙ Advantages
❙ using SOAP over HTTP allows for easier communication
through proxies and firewalls
❙ platform independent
❙ language independent
❙ Disadvantages
❙ Slower than technologies like CORBA
❙ Bad performance with binary data

A simple SOAP message

❙ Simple structure of a SOAP message

<?xml version=quot;1.0quot;?>
<s:Envelope
xmlns:s=quot;http://www.w3.org/2001/12/soap-envelopequot;>
<s:Header>
</s:Header>
<s:Body>
</s:Body>
</s:Envelope>


Using SOAP with PHP

❙ ext/soap can be used to write SOAP servers and clients
❙ Support of subsets of SOAP 1.1, SOAP 1.2 and WSDL 1.1
specifications
❙ No built-in support for WS-Addressing!
❙ SOAP server
$server = new SoapServer('some.wsdl',
array('soap_version' => SOAP_1_2));

❙ SOAP client
$client = new SoapClient('some.wsdl',
array('soap_version' => SOAP_1_2));



❙ By default, SOAP webservices are stateless
❙ A stateful SOAP webservice is a webservice that maintains state
information between message calls
❙ Session ID is stored in the SOAP header with WS-Addressing (WS-A)
❙ How do stateful SOAP webservices work?
❙ Request by SOAP client
CS
❙ SOAP session will be created by SOAP server
❙ Response from SOAP server to SOAP client with Session ID
CS
❙ More interaction between client and server
❙ Used in mulit-user environments with multiple requests/responses

Implementation

Apache Axis2 example:

<wsa:ReplyTo>
<wsa:Address>
http://www.w3.org/2005/08/addressing/anonymous
</wsa:Address>
<wsa:ReferenceParameters>
<axis2:ServiceGroupId xmlns:axis2=
quot;http://ws.apache.org/namespaces/axis2quot;>
urn:uuid:65E9C56F702A398A8B11513011677354
</axis2:ServiceGroupId>
</wsa:ReferenceParameters>
</wsa:ReplyTo>


PHP implementation

❙ ext/soap doesn‘t support SOAP sessions
❙ Would be possible with WSO2 Web Services
Framework/PHP (WSO2 WSF/PHP) extension
❙ We have to overwrite the
SoapClient::__doRequest() method from PHP to
implement WS-Addressing support
❙ First, we have to add a WS-A class written by Rob Richards
(http://www.cdatazone.org/files/soap-wsa.phps)
❙ Parses to the SOAP XML header
❙ Sets the session ID
❙ Also support for WS-Security (WS-S) if needed


PHP implementation (I)

class MyProject_SOAPClient extends SoapClient
{
public function __doRequest($request, $location, $saction, $version)
{
$dom = new DOMDocument();
$dom->loadXML($request);
$wsasoap = new WSASoap($dom);
$wsasoap->addAction($saction);
$wsasoap->addTo($location);
$wsasoap->addMessageID(); // Sets the session ID
$wsasoap->addReplyTo();
$request = $wsasoap->saveXML();
return parent::__doRequest($request, $location, $saction, $version);
}
}


PHP implementation (II)

class OurService {
/* … */
$axis2session = $this->_getSoapSession($this->soapClient->__getLastResponse());
$soapHeader = new SoapHeader('http://ws.apache.org/namespaces/axis2',
'ServiceGroupId',$axis2session);
$this->soapClient->__soapCall('getData', array(), null, $soapHeader);
/* … */
private function _getSoapSession($response) {
$soapsession = '';
$xml = new XMLReader();
$xml->XML($response);
while ($xml->read()) {
if (strpos($xml->name, 'axis2:ServiceGroupId') !== false) {
$xml->read();
$soapsession = $xml->value;
$xml->read();
}
}
return $soapsession;
}
}

Welcome to the real world

❙ Various applications based on
❙ Java (main application)
❙ Excel with a included DLL written in C++
❙ Access/Visual Basic
❙ Web application in PHP (our project)
❙ All applications were using the same calculation logic but
implemented in different programming language
❙ Big problems when the logic changes
❙ Solution
❙ Migration of the Access tool into the PHP application
❙ Build a SOAP service on top of the Java classes
❙ Replace the C++ written library and our PHP based library
with the SOAP webservice

Welcome to the real world!
Old architecture

Microsoft Office Client PC

Microsoft Access and Excel

mod_php
MySQL
Apache 2.0
Linux
J2EE Cluster (Calculation engine) Stateful SOAP Webservices

Welcome to the real world!
Current architecture
J2EE Cluster (Calculation engine)
Microsoft Office Client PC

Transfer by SFTP

SOAP over HTTPS

SOAP
SOAP

mod_php
Axis2
java.class
MySQL
Apache 2.0
Tomcat 5.5
Linux

Questions and answers


Thank you very much!

Thorsten Rinne, Dipl.-Inf. (FH)
Mayflower GmbH
Mannhardtstraße 6
D-80538 München
Germany
+49 (89) 24 20 54 – 31
thorsten.rinne@mayflower.de

Stateful SOAP Webservices with Java and PHP

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