Intro to web services

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Introduction to Web Services Sabyasachi Ghosh [email_address]

Agenda <ul><li>Refresher: Networking/OSI Model </li></ul><ul><li>Socket Programming </li></ul><ul><li>Remote Procedure Cal...

Client-Server Technology CLIENT SERVER NETWORK Request Request Request Response Response

The OSI Model

Introduction to Sockets <ul><li>Socket is an endpoint of a bidirectional inter-process communication flow across an IP-bas...

Sockets Sockets are generalized form of inter-process communication (IPC)

RPC – Remote Procedure Calls <ul><li>Remote Procedure Call (RPC) is an inter-process communication that allows a computer ...

RPC – How does it work ? <ul><li>A client makes a call to the procedure in a remote machine (server) which has the busine...

RPC – More formally: <ul><li>The client calls the Client stub. The call is a local procedure call, with parameters pushed ...

XML: Introduction <ul><li>eXtensible Markup Language </li></ul><ul><li>A simplified version of SGML [ Standard Generalized...

XML: Differences with HTML <ul><li>XML was designed to carry data, not displaying data </li></ul><ul><li>XML is not a repl...

XML: Example <?xml version="1.0"?> < catalog > < product category = "mobile phone"> <mfg>Nokia</mfg...

XML: More on it <ul><li>XML is a metalanguage, not a specific language. </li></ul><ul><li>Defines the rules how to mark up...

XML RPC

JSON <ul><li>Object: collection of comma separated Attributes </li></ul><ul><ul><li>var object = { } </li></ul></ul><ul><l...

{ "firstName": "John", "lastName": "Smith", "age": 25, "address&quo...

What is a Web Service <ul><li>A web service is a piece of business logic, located somewhere on the Internet, that is acces...

Web Services: Alternate definition <ul><li>A web service is just a web page meant for a computer to request and process. <...

Service Oriented Architecture <ul><li>As per Wikipedia, Service-oriented architecture (SOA) is a flexible set of design pr...

Service Oriented Architecture Requestor Providers Registry FIND , UDDI BIND , SOAP/WSDL PUBLISH, UDDI

Components of SOA <ul><li>Participants: </li></ul><ul><ul><li>Provider </li></ul></ul><ul><ul><li>Registry (broker) </li><...

SOA: Publishing (dynamic) Provider Registry Here is my service !

SOA: Locating Service Requestor Registry Where is the service? Find it here !

SOA: Binding Requestor Registry How can I access ? Here is how ! Provider What is the temperature today? 40 C

Characteristics of a Web Service <ul><li>XML-based </li></ul><ul><li>Loosely coupled </li></ul><ul><li>Coarse-grained </li...

Major Technologies for WS <ul><li>SOAP – Simple Object Access Protocol </li></ul><ul><li>WSDL – Web Services Definition/De...

SOAP <ul><li>SOAP stands for Simple Object Access Protocol. It is based on XML. </li></ul><ul><li>It is a wired protocol a...

SOAP: Layers SOAP-ENV:Envelope SOAP-ENV:Header SOAP-ENV:Body

SOAP: Example POST /InStock HTTP/1.1 Host: www.example.org Content-Type: application/soap+xml; charset=utf-8 Content-Lengt...

Creating a SOAP message <student> <roll>120</roll> <firstName>Kiran</firstName> <lastName>Reddy</lastName> <grades> <engli...

SOAP: Envelop <ul><li>The SOAP envelope declaration is simply the outermost XML tag that delineates the boundaries of the ...

SOAP: Header & Body <ul><li>The SOAP header and body are syntactically similar. </li></ul><ul><li>It is simply a place to ...

SOAP: Fault <ul><li>SOAP errors are handled using a specialized envelope known as a Fault Envelope. </li></ul><ul><li>If ...

RESTful Architecture

HTTP: Introduction <ul><li>The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collab...

HTTP: How does it work? <ul><li>The HTTP protocol is a request/response protocol. </li></ul><ul><li>A client sends a reque...

HTTP: How does it work? <ul><li>The server responds with a status line, including the message's protocol version and a suc...

HTTP: Request/Response Client Request GET /vnav/labs/PHP/HTTP.php HTTP/1.1 Host: loadaveragezero.com User-Agent: Mozilla/5...

What is REST? <ul><li>REST stands for Representational State Transfer. </li></ul><ul><li>Its basically a stateless commun...

REST: The other verbs <ul><li>GET to retrieve information </li></ul><ul><li>POST to add new information, showing its relat...

RESTful Application Cycle Resources are identified by URIs ↓ Clients communicate with resources via requests using astanda...

REST: Give Everything an ID <ul><li>ID is a URI </li></ul><ul><li>http://example.com/widgets/foo </li></ul><ul><li>http://...

Q & A Thank You!

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