Introduction to web services
- 1. Web Services By-Nitin Kumar Yadav 4/24/2018 MNNIT ALLAHABAD 1
- 2. Web Service • A Web services an interface that describes a collection of operations that are network accessible through standardized XML messaging. • A Web service is described using a standard, formal XML notion, called its service description. • The interface hides the implementation details of the service, allowing it to be used independently of the hardware or software platform on which it is plemented and also independently of the programming language in which it is written. • Web Services-based applications to be loosely coupled, component- oriented,cross-technology implementations. 4/24/2018 MNNIT ALLAHABAD 2
- 3. Web Service Stack 4/24/2018 MNNIT ALLAHABAD 3
- 4. WSFL • Web Services Flow Language is a language for the description of Web Services compositions. • WSFL considers two types of Web Services compositions. • The appropriate usage pattern of a collection of Web Services, in such a way that the resulting composition describes how to achieve a particular goal typically, the result is a description of a business process. • The interaction pattern of a collection of Web Services; in this case, the result is a description of the overall partner interactions. 4/24/2018 MNNIT ALLAHABAD 4
- 5. UDDI • UDDI (Universal Description, Discovery, and Integration) is an XML-based registry for businesses worldwide to list themselves on the Internet. Its ultimate goal is to streamline online transactions by enabling companies to find one another on the Web. 4/24/2018 MNNIT ALLAHABAD 5
- 6. Abstract WSDL • Format for describing the web service interface. • It is written in XML. • Describes how services are bounded to specific network address. • It is used in combination with SOAP and XML Schema. • It defines the operation provided by the web service. • Defines the format for input , output and fault messages. • Consists of three Major Sections-: • Types • Message • Port type 4/24/2018 MNNIT ALLAHABAD 6
- 7. • Binding- • Defines the message format. • Protocol information for operations defined by the port Type. • It has two attributes name and type. • Name defines the name of attribute and type points to the port. • Service- • Defines the endpoint where the web service will be exposed. • Specifies the address where a bound operation may be found. • Location is given in the form of url. 4/24/2018 MNNIT ALLAHABAD 7 Concrete WSDL
- 8. 4/24/2018 MNNIT ALLAHABAD 8 Element Description Envelop Identifies the XML document as a SOAP Message. Header Contains header information. Body Contains call, and response information. Fault Provides information about errors that occurred while processing the message. SOAP originally Simple Object Access Protocol is a protocol specification for exchanging structured information in the implementation of web services in computer networks. Its purpose is to induce extensibility, neutrality and independence. SOAP Building Block
- 9. WSRM • Web Services Reliable Messaging describes a protocol that allows messages to be delivered reliably between distributed applications in the presence of software component, system, or network failures. • The protocol is described in this specification in an independent manner allowing it to be implemented using different network transport technologies. WSS • Web Services Security (WSS or WS-Security) describes enhancements to SOAP messaging in order to provide quality of protection through message integrity, and single message authentication. • These mechanisms can be used to accommodate a wide variety of security models and encryption technologies. 4/24/2018 MNNIT ALLAHABAD 9
- 10. WS Addressing • Web Services Addressing (WS-Addressing) is a World Wide Web Consortium (W3C) specification that aids interoperability between web services by defining a standard way to address web services and provide addressing information in messages. SAML • Security Assertion Markup Language (SAML) is an XML framework for exchanging authentication and authorization information. 4/24/2018 MNNIT ALLAHABAD 10
- 11. SOA(Service Oriented Architecture) • A service-oriented architecture is essentially a collection of services. These services communicate with each other. • The communication can involve either simple data passing or it could involve two or more services coordinating some activity. WSEL(Web Service Endpoint Language) • Web Service Endpoint Language (WSEL) is an XML format for the description of non-operational characteristics of service endpoints, like quality-of-service, cost, or security properties. • Binding is process of mapping a name to a address 4/24/2018 MNNIT ALLAHABAD 11
- 12. XACML • stands for eXtensible Access Control Markup Language. • provides fine grained control of authorized activities. Granularity • Measure of amount of work performed by a Task. 4/24/2018 MNNIT ALLAHABAD 12
- 13. Thank You… 4/24/2018 MNNIT ALLAHABAD 13
- 14. References • IBM Software Group • Wikipedia 4/24/2018 MNNIT ALLAHABAD 14