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Context And Concept Of Web Services

This presentation was presented in Bogazici Univertiy by me. It was a small presentation of an essay.

Thanks to Gokhan Ozdinc for instructing "Special Topics in Electronic and Mobile Commerce Technologies in the New Era".

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Context And Concept Of Web Services

  1. 1. Context and Concept of Web Services Fatih Taşkın
  2. 2. Definition <ul><li>IBM: “A Web Service is a collection of functions that are packaged as a single entity and published to the network for use by other programs...[They are] self-describing, self-contained, modular applications...”(Glass, 2000). </li></ul><ul><li>World Wide Web Consortium (W3C): “A software system identified by a URI [uniform resource indicator], whose public interfaces and bindings are defined and described using XML [extensible markup language]. Its definition can be discovered by other software systems. These systems may then interact in a manner prescribed by its definition, using XML based messages conveyed by internet protocols” (W3C, 2002). </li></ul>
  3. 3. Distributed Computing Systems <ul><li>Computing was distributed over the networks instead of being performed on a single,centralized computer. </li></ul><ul><li>The centralization of activities presented some problems in terms of scalability and flexibility. </li></ul>
  4. 4. Common Object Request Broker Architecture (CORBA) <ul><li>CORBA is an open-standards -based solution to distributed computing. The Object Management Group , an industry consortium, developed the specifications for CORBA. </li></ul><ul><li>The primary advantage of CORBA is that clients and servers can be written in any programming language. </li></ul>
  5. 5. Distributed Component Object Model (DCOM) <ul><li>Microsoft’s DCOM has a layer that sits on the top of a remote procedure-calling (RPC) mechanism and allows calls to remote objects that interact with the COM run-time services. </li></ul>
  6. 6. Remote Method Invocation (RMI) <ul><li>RMI enables one to create Java-to-Java applications, in which the methods of remote Java objects can be invoked from other Java virtual machines. </li></ul><ul><li>A Java program can make a call on the remote object once it obtains a reference to the remote object. </li></ul>
  7. 7. World Wide Web <ul><li>The transmission control protocol/ Internet protocol (TCP/IP) formed the common base protocol for connectivity. </li></ul><ul><li>This was followed by the advent of various protocols like the hypertext transfer protocol (HTTP), file transfer protocol (FTP), and Gopher for specific needs. </li></ul><ul><li>XML </li></ul>
  8. 8. Web Services Architecture Service Requestor: This is the agent that requests a service. Service Provider: This is the owner of the service Service Registry: This is a registry that contains all available services.
  9. 9. Web Services Protocols <ul><li>Service Invocation and Communication: Simple object access protocol (SOAP) </li></ul><ul><li>Service Description: Web services description language (WSDL) </li></ul><ul><li>Service Discovery: Universal description, discovery and integration (UDDI) </li></ul><ul><li>Standard Transport Protocol: HTTP </li></ul><ul><li>Underlying Protocol: XML </li></ul>
  10. 10. Understanding Web Services <ul><li>The Web aspects of Web services </li></ul><ul><ul><li>Web-Based Protocols: Web services are based on HTTP and thus are designed to work over the public Internet. </li></ul></ul><ul><ul><li>Interoperability: The XML-based protocols used for communication in SOAP define a common standard that allows differing systems to interoperate </li></ul></ul><ul><li>The service aspect </li></ul><ul><ul><li>Modular: The service components are useful, are reusable, and can be combined to form larger components. </li></ul></ul><ul><ul><li>Available: Services are available to systems that wish to use them. </li></ul></ul><ul><ul><li>Described: Services have service descriptions,which are also machine readable to identify the interface of the service. </li></ul></ul><ul><ul><li>Implementation Independent: The service interface must be available in a way that is independent of the ultimate implementation. </li></ul></ul>
  11. 11. Simple Object Access Protocol <ul><li>SOAP provides a simple and lightweight mechanism for exchanging structured and typed information between peers in a decentralized and distributed environment using XML </li></ul>
  12. 12. SOAP Parts <ul><li>SOAP Envelope Construct: Defines an overall framework for expressing what is in a message, who should deal with it, and whether it is optional or mandatory. </li></ul><ul><li>SOAP Encoding Rules: Define a serialization mechanism that can be used to exchange instances of application-defined data types. </li></ul><ul><li>• SOAP RPC Representation: Defines a convention that can be used to represent RPCs and responses. </li></ul>
  13. 13. Universal Description,Discovery, and Integration <ul><li>UDDI is a standard designed to facilitate a searchable directory of service providers. </li></ul><ul><ul><li>Yellow-Pages Taxonomies: Here, searches can done according to a particular industry, sector, or product category. </li></ul></ul><ul><ul><li>White Pages: This contains address information, contact information, and the phone numbers of service providers. </li></ul></ul><ul><ul><li>Green Pages: This contains the technical details about the service provider. It tells the service requestor the details as to how to invoke the request with that particular service provider. </li></ul></ul>
  14. 14. Thank you and them <ul><li>All text and visual materials were directly taken from </li></ul><ul><li>Essay of Context and Concept of Web Services </li></ul><ul><ul><ul><ul><li>Vijay Kasi ( Georgia State University, USA ) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Brett Young ( Georgia State University, USA ) </li></ul></ul></ul></ul>

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