Web service introduction 2

Introduction to Web Service - 2
SagaraGunathunga
( Apache web Service and axis committer)

CONTENTS

WS specification overview
There are some standard bodies to define specification related to
Web Services generally known as WS-* specifications .
SOAP
WSDL
WS- Addressing
WS-security
WS- Policy
WS- Reliable Messaging
WS -evening
WS- Notification
WS-MetadataExchange
WS-Resource Framework
WS-Transaction
WS-AtomicTransaction
WS-BPEL

WS- Addressing
SOAP does not provide a standard way to specify
where a message is going ?
how to return a response ?
where to report an error ?
transport protocol such as HTTP , JMS can be used to define those properties .

e.g. HTTP Headers
Host URI
The type of the
message being
conveyed is SOAP
SOAP Action

Conclusion

WS – Addressing and WSDL

WS – Addressing
WS-Addressing was originally authored by Microsoft, IBM, BEA, Sun, and SAP and submitted to W3C for standardization. The W3C WS-Addressing Working Group has refined and augmented the specification in the process of standardization.
http://xml.coverpages.org/ws-Addressing.html
http://www.w3.org/TR/ws-addr-core/

Asynchronous communication
The address of the sender of the
message, the addresses for return
reply or fault messages are given
current message has id “uuid:someid”
and it is related with another message
that has id “uuid:someotherid” and the
type of the relationship is “Reply”

Dynamic endpoint addressing
Endpoint is any addressable resource to which SOAP message can be sent (Web Service client or application, a SOAP router or any SOAP aware entity
The most logical way to include endpoints is to use WSDL “Service” element, however WSDL does not allow extensibility of this element, therefore EndpointReference is defined.
<From>, <ReplyTo>, <FaultTo> tags convey an “EndpointReference”

WS – Security

WS – Security
Identification
Authentication

Authorization
Message integrity
Confidentiality

Security Extensions
WS – Security stack
WS-
Secure
Conversation
WS-
Federation
WS-
Authorization
WS-Policy
WS-Trust
WS-Privacy
WS-Security
XKMS
SAML
XACML
SPML
Soap Foundation
XML
Encryption
XML
Digital
Signature
14
06.03.2005

WS – Security stack

Message Security vs. Transport Security
Message level Security - Advantages
Message level Security - Disadvantages

Message Security vs. Transport Security
Transport level Security - Advantages
Transport level Security - Disadvantages

WS - Reliable messaging

WS – interoperability (WS- I)

WS-I Goals
Achieve Web services interoperability
Integrate specifications
Promote consistent implementations
Provide a visible representation of conformance
Accelerate Web services deployment
Offer implementation guidance and best practices
Deliver tools and sample applications
Provide a implementer’s forum where developers can collaborate
Encourage Web services adoption
Build industry consensus to reduce early adopter risks
Provide a forum for end users to communicate requirements
Raise awareness of customer business requirements

WS- I Deliverables
Profiles
Defined set of specifications or standards at specific version levels
Guidelines and conventions for using these specifications together in ways that ensure interoperability
Sample applications
Use cases and usage scenarios based on customer requirements
Sample code and applications built in multiple environments
Demonstrate profile-based interoperability
Test tools and supporting materials
Tools that test profile implementations for conformance with the profiles
Supporting documentation and white papers

WS- I Deliverables
Basic Profile
Basic Profile 1.0 and 1.1
More than 200 interoperability issues resolved in the Basic Profile 1.0; conventions around messaging, description and discovery
Simple SOAP Binding Profile 1.0
— Derived from Basic Profile requirements related to serialization of an envelope and its representation in the message
Sample Applications and Testing Tools for the Basic Profile
• Attachments Profile 1.0
Complements the Basic Profile 1.1 to add support for conveying interoperable, SOAP with Attachments (SwA) with SOAP messages

WS- I Basic profile 1
What is a profile?
A set of specifications at specific version levels
Guidelines and conventions for using the specifications together
WS- I BP 1.0
SOAP 1.1
WSDL 1.1
UDDI 2.0
XML 1.0 (Second Edition)
XML Schema Part 1: Structures
XML Schema Part 2: Datatypes
The Secure Sockets Layer Protocol Version 3.0
RFC2246: The Transport Layer Security Protocol Version 1.0
RFC2459: Internet X.509 Public Key Infrastructure Certificate and CRL Profile
RFC2616: HyperText Transfer Protocol 1.1
RFC2818: HTTP over TLS
RFC2965: HTTP State Management Mechanism

WS Composition
I n most of the real world scenarios it is required to interact with several services in a predefine or dynamic order.
Businesses requires to quickly adapt to customer needs and market conditions EAI and B2B interactions (through web services)
Needs to be flexible internally and externally
Without a common set of standard, each organization is left to build their own set of proprietary business protocols
Leaving little flexibility for true web services collaboration

Web Service Composition

Static – Dynamic WS Compositions

BPEL - Overview

BPEL – example process

BPEL - code sample
<sequence>
<receive partner=”buyer” … operation=”sendOrder” container=”request”/>
<invoke partner=”supplier” … operation=”request” container=”order”/>
<reply partner=”buyer” … operation=”response” container=”proposal”/>
</sequence>

BPEL – sample

Thank You
Aeturnum Lanka (Pvt) Ltd
197, Stanley Thilakaratna Mw, Nugegoda 10250, Sri Lanka
Phone: +94 11 5518177 | Email: info@aeturnum.com
Web: www.aeturnum.com | www.athiva.com

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