Web services
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Web Services. “ A software system designed to support interoperable Machine to Machine interaction over a network“. “ Web based application that use s open, XML-based standards and transport protocols to exchange data with clients ”. Kas ir Web servisi?. Eksistē daudz dažādas definīcijas ….

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Web services

Web Services


Kas ir web servisi

“A software system designed to support interoperable Machineto Machineinteraction over a network“

“Web based application that uses open, XML-based standards and transport protocols to exchange data with clients”

Kas ir Web servisi?

Eksistē daudz dažādas definīcijas…


W3c defin cija

W3C definīcija

A Web service is a software application

identified by a URI,

whose interfaces and binding are

capable of being defined, described and

discovered by XML artifacts and

supports direct interactions with other

software applications

using XML based messages

via internet-based protocols


Citiem v rdiem

Citiem vārdiem...

  • Web serviss ir programmatūra, kas ir identificējama tīmeklī pēc URI, kurai klienti piekļūst izmantojot uz XML balstītu protokolu (SOAP), kurš tiek izmantots virs Internet protokola (HTTP)

  • Klienti piekļūst Web servisa programmai caur tas interfeisiem un saistībām (bindings), kuri ir definēti izmantojot XML artefaktus (WSDL)


No biznesa skatiena

No biznesa skatiena...

  • Web Services: A distributed or virtual applications or processes that use the Internet to link activities or software components.

  • A travel Web site that:

    • takes a reservation from a customer,

    • sends a message to a hotel application, accessed via the Web, to determine if a room is available,

    • books it,

    • tells the customer he or she has a reservation

      is an example of a Web Services application.

“Business Process Trends” http://www.bptrends.com/resources_glossary.cfm?letterFilter=W&displayMode=all


Web servisu raksturojums

Web servisu raksturojums

  • XML based everywhere

  • Message-based

  • Platform and programming language independent

  • Could be dynamically located

  • Could be dynamically assembled or aggregated

  • Accessed over the Internet

  • Loose coupling between invoker and service

  • Based on industry standards


Distributed computing evolution

Distributed Computing Evolution


Traditional c s vs web services

Traditional C/S vs. Web Services


Web application vs web services

Web Application vs. Web Services


Web servisu att st ba

Web servisu attīstība

  • Web servisu attīstības fāzes:

    • Phase 1 (1999-2001)

      • Simple

      • Business-to-Consumer (B2C)

    • Phase 2 (2002-2004)

      • Enterprise Application Integration (EAI)

      • Private UDDI Registries

    • Phase 3 (2005-...)

      • Business-to-Business (B2B)

      • Public UDDI Registries

  • [W3C] Web Services Activity: History

    http://www.w3.org/2002/ws/history.html


Web servisu arhitekt ra

Web servisu arhitektūra


Web servisu standarti

Web servisu standarti

  • Common markup language for communication

    • XML (eXtensible Markup Language)

  • Common message format for exchanging information

    • SOAP (Simple Object Access Protocol)

  • Common service specification formats

    • WSDL (Web Services Description Language)

  • Common means for service lookup

    • UDDI (Universal Description, Discovery, and Integration)


Web services big picture

Service Discovery

Service Description

XML Messaging

Service Transport

Web Services Big Picture

  • Service Discovery

    • UDDI

  • Service Description

    • WSDL

  • XML Messaging

    • SOAP and XML-RPC

  • Service Transport

    • HTTP, SMTP, FTP etc.

The Protocol Stack


Web servisu mijiedarb ba

Web servisu mijiedarbība

Web servisi un Web servisu klienti sadarbojas izmantojot SOAP, WSDL, UDDI tehnoloģijas


Pamata specifik cijas

Pamata specifikācijas

  • Pamata specifikācijas ir apvienotas WS-I profilā

  • WS-I = Web Services Interoperability

  • Svarīgākas WS-I specifikācijas:

    • WS-I Basic Profile

    • Simple Soap Binding Profile

    • Basic Security Profile

  • Papildus WS-I piedāvā:

    • Sample Applications

    • Testing Tools


Papildus specifik cijas

Papildus specifikācijas

Dažas specifikācijas bija izstrādātas, lai paplašināt Web servisu spējas un ir apvienotas WS-* profilā

  • WS-Security

  • WS-Reliability

  • WS-ReliableMessaging

  • WS-Addressing

  • WS-Transaction

  • WS-BPEL

  • vēl daudz citas...


Java ee web services

Java EE & WebServices


Java ee web services1

Java EE & WebServices

  • J2EE community has defined overall framework for Web Services in J2EE 1.4 (JSR 109)

  • Java EE 5 accelerates and radically simplifies Enterprise Java development, especially for Web Services

  • The Java EE platform provides a complete framework for developing and deploying Web Services on the Java platform


Java ee tehnolo ijas

Java EE tehnoloģijas

Primāras Java EE 5 platformas tehnoloģijas:

  • Java API for Web Services (JAX-WS) 2.0

  • Java API for XML-Based RPC (JAX-RPC) 1.1

  • Java Architecture for XML Binding (JAXB) 2.0

  • SOAP with Attachments API for Java (SAAJ)

  • Streaming API for XML (StAX)

  • Web Service Metadata for the Java Platform


Web servisu veidi

Web servisu veidi

Web servisu izmantošanas stili:

  • RPC = Remote procedure calls

    • A distributed function (or method) call interface

  • SOA = Service-oriented architecture

    • Basic unit of communication is a message, rather than an operation

  • RESTful = Representational state transfer

    • An attempt to emulate HTTP and similar protocols by constraining the interface to a set of well-known, standard operations (e.g., GET, PUT, DELETE)


Web servisu mijiedarb bas veidi

Web servisu mijiedarbības veidi

  • Sinhroni web servisi

    • Klienti sūta pieprasījumu servisam un pārtrauc savu darbību kamēr gaida atbildi

    • RPC-oriented approach

    • JAX-RPC servlet endpoint

  • Asinhroni web servisi

    • Klienti inicializē servisa pieprasījumu un turpina savu darbību negaidot atbildi

    • Document-oriented approach

    • JAX-RPC servlet endpoint + JMS + EJB


Classification

Classification

  • “Big Web Services”

    • Traditional enterprise Web services

    • SOAP & WSDL

  • “Lighter-weight Web Services”

    • RESTful approach

    • Web API (feature of Web 2.0)

    • Mashups


Restful

RESTful

  • REST (Representational State Transfer)

    is a key design idiom that embraces a stateless client-server architecture in which the web services are viewed as resources and can be identified by their URLs

  • The definition of RESTful web service consists of

    • The base URI for the web service (http://example.com/resources/)

    • The MIME type of the data supported by the web service

      • e.g. JSON, XML, YAML

    • The set of operations supported by the web service using HTTP methods

      • e.g. POST, GET, PUT, DELETE

http://java.sun.com/developer/technicalArticles/WebServices/restful/


Web api

Web API

  • Web APIs are functionalities made available by websites to their users or visitors in a programmatically way

  • Developers can use these Web APIs and enrich their applications with useful functions from third parties

  • Web API is a new direction to follow by W3C in a new working group: Web APIs Working Group

http://www.w3.org/2006/webapi/


Web api1

Web API

  • Some of the most well-known web APIs are

    • Google Maps or Google Search

    • Yahoo Maps or Yahoo Search

    • eBay API

    • Amazon API

    • Paypal API

    • Skype API

    • and many more

  • Some links:

    • http://www.programmableweb.com/apis

    • http://www.webapi.org

    • http://www.w3.org/2006/webapi/


Mashups

Mashups

  • Mashup is a web page or application that combines data or functionality from two or more external sources to create a new service

  • Easy, fast integration, frequently using open APIs and data sources

  • Types of mashups:

    • consumer mashups

    • data mashups

    • enterprise mashup


Spring web services

Spring Web Services

  • Spring Web Services (Spring-WS)

    is a product of the Spring community focused on creating document-driven Web services

  • Aims to facilitate contract-first SOAP service development (as opposed to contract-last approach)

http://static.springsource.org/spring-ws/sites/1.5/reference/html/index.html


Summary

Summary

  • Web services provides a new paradigm for program to program communication

  • Web services standards are XML, SOAP, WSDL and UDDI

  • Comprehensive set of Java APIs for Web services is available!

  • Java EE is the platform of choice for Web services


References

References

  • Java Web Services At a Glancehttp://java.sun.com/webservices/index.jsp

  • Book “J2EE Web Services” by Richard Monson-Haefel

    http://www.amazon.ca/J2EE-Web-Services-Richard-Monson-Haefel/dp/0321146182

  • Web Service Interaction Architectures

    http://java.sun.com/blueprints/webservices/using/webservbp3.html


References1

References

  • JBoss Web Services

    http://labs.jboss.com/jbossws/

  • Spring Web Services

    http://static.springframework.org/spring-ws/site/index.html

  • Java Web Services Overview Presentationhttp://www.javapassion.com/webservices/WebServicesOverview.pdf

  • Another Java Web Services Overview Presentationhttp://www.dma.unina.it/~murli/GridSummerSchool2004/presentations/Fox/background/WebServicesOverview.pdf


References2

References

  • Services Mashups: The New Generation of Web Applications

    http://dsonline.computer.org/portal/site/dsonline/menuitem.9ed3d9924aeb0dcd82ccc6716bbe36ec/index.jsp?&pName=dso_level1&path=dsonline/2008/09&file=w5gei.xml&xsl=article.xsl


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