pdf on big dataanalytics_unit1withslideshare.pptx

its about api in computer design

1. REST API

2. REST Acronym for RE presentational S tate T ransfer. It is NOT A PROTOCOL It is an architectural style A Web API conforming to the REST architectural style is called a REST API (or RESTful API).

3. Guiding Principles These provides simplicity, scalability and statelessness. The six guiding principles or constraints are:

4. Principles Uniform Interface Identification of resources – unique identity Manipulation of resources through representations – uniform server response representations, used to modify resource state in server Self – descriptive messages – info. on message processing, additional information’s Client – Server Separation of concerns of client & server. Improves portability across platform Improves scalability by simplifying server components Make sure the client server interface doesn’t break

5. Principles Stateless Each client request must contain all necessary & complete request. Client application must keep the session state. Cacheable Responses should be labelled cacheable or non – cacheable. If cacheable, response data can be reused for a specified period. Layered System Hierarchical layers, each component can’t be seen beyond the layer they are interacting. Code on Demand (Optional) – reduces re - implementation

6. Resource Key abstraction of information Any information is a resource. Resource Representation – state of the resource. Resource Representations consist of Data Metadata Hypermedia links – helps client to transition to the next desired state.

7. Resource Resource Identifiers Used to identify each resource involved in the interactions between the client and server components Hypermedia Media type – data format of the representation RESTful API looks like a hypertext. Self – Descriptive Resource representations shall be self – descriptive. Client doesn’t need to know if resource is a device or an employee.