REST Vs. SOAP.

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Presentation transcript:

REST Vs. SOAP

REST Vs SOAP  Simple web service as an example: querying a phonebook application for the details of a given user Using Web Services and SOAP, the request would look something like this: <?xml version="1.0"?> <soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:body pb="http://www.acme.com/phonebook"> <pb:GetUserDetails> <pb:UserID>12345</pb:UserID> </pb:GetUserDetails> </soap:Body> </soap:Envelope>

REST Vs SOAP  Simple web service as an example: querying a phonebook application for the details of a given user And with REST? The query will probably look like this: http://www.acme.com/phonebook/UserDetails/12345 GET /phonebook/UserDetails/12345 HTTP/1.1 Host: www.acme.com Accept: application/xml Complex query: http://www.acme.com/phonebook/UserDetails?firstName=John&lastName=Doe

Why REST?

Web Roy Fielding and his doctoral thesis, “Architectural Styles and the Design of Network-based Software Architectures.” Why is the Web so prevalent and ubiquitous? What makes the Web scale? How can I apply the architecture of the Web to my own applications? The set of the architectural principles given by Roy Fielding to answer these questions - REpresentational State Transfer (REST)

REST - set of principles Addressable resources -Resource oriented, and each resource must be addressable via a URI -The format of a URI is standardized as follows: scheme://host:port/path?queryString#fragment A uniform, constrained interface -Uses a small set of well-defined methods to manipulate your resources. -The idea behind it is that you stick to the finite set of operations of the application protocol you’re distributing your services upon.

REST - set of principles Representation-oriented -Interaction with services using representations of that service. -Different platforms, different formats - browsers -> HTML, JavaScript -> JSON and a Java application -> XML? Communicate statelessly -Stateless applications are easier to scale. Hypermedia As The Engine Of Application State (HATEOAS) -Let your data formats drive state transitions in your applications.

What is REST?

HTTP Request/Response As REST http://www.javapassion.com/webservices/RESTPrimer.pdf

RESTful Architectural Style

Set of Constraints Client-Server: Separation of concerns Client-Stateless-Server: Visibility, Reliability, Scalability Caching : improves efficiency, scalability and user perceived performance, reduces average latency Uniform Interface: simplify overall system architecture and improved visibility of interactions Layered System: Simplifying components, Shared caching, Improved Scalability, Load balancing Code-On-Demand: Simplifies clients, Improves extensibility

REST over HTTP – Uniform interface CRUD operations on resources Create, Read, Update, Delete Performed through HTTP methods + URI http://www.javapassion.com/webservices/RESTPrimer.pdf

WADL

WADL elements Application Grammar Include Resources Resource Resource Type Method Request Response Representation Param Link Doc https://wadl.dev.java.net/wadl20090202.pdf