Lsokolowski: /* Exercises */

2021-09-25T21:16:00Z

Exercises

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{{Cat|Web Services Basics For Non-programmers|09}}
{{Cat|REST|01}}

<slideshow style="nobleprog" headingmark="⌘" incmark="…" scaled="true" font="Trebuchet MS" >
;title: Web Services Basics For Non-programmers
;author: Pete George (NobleProg Ltd)
</slideshow>

=Day Two Schedule ⌘=
# WSDL
# Handling Binary Content
# RESTfull Web Services
# Other Technologies
# Conclusion
=RESTful Web Services ⌘=
Learning Objectives
* To appreciate the REST style
* To understand the principles of RESTful Web services
* To understand the structure of JSON
* To understand the benefits of using JSON in Web services
=RESTful Web Services ⌘=
* Web services based on REST principles
* Alternative to SOAP/WSDL
* Growing in popularity
* Implemented using XML and JSON
=REST ⌘=
* Representational State Transfer
* Style of architecture
* Asserts principles for how networked resources are defined and addressed
=WWW Based on REST ⌘=
[[File:REST 1.png|600px]]

=Uniform Resource Identifier (URI) ⌘=
*String that points to a resource
*Can be:
-URL = Uniform Resource Locator

-E.g. http://www.facebook.com
=Resource ⌘=
*Anything that can be pointed to by a URI
*Examples:
-Webpage

-Location on server that processes web forms
=WWW Based on REST ⌘=
[[File:REST 2.png|600px]]

=Hypertext Transfer Protocol (HTTP) ⌘=
* Transport protocol
* Uniform Interface
-i.e. request methods and meaning are fixed

-Get, Post, Put, etc
*NB: REST is not limited to HTTP
-(although developed alongside HTTP)
=WWW Based on REST ⌘=
[[File:REST 3.png]]

=Representations ⌘=
*HTML document is a “representation” of the resource, i.e. webpage
*Encapsulates the information
-State

-Data

-Markup
*Type of representation designated by media type
-E.g. text/html

-(HTTP is an implementation of the REST style)
=WWW Based on REST ⌘=
[[File:REST 4.png|600px]]

=Hypermedia ⌘=
*HTML is hypermedia format
-i.e. provides links to browse through application
*Browser “discovers” different parts of the website application through links
-Doesn’t need prior knowledge of application

-Unlike SOA – fixed interface shared through, e.g. WSDL
*User changes state of application by selecting links
-“Hypermedia as the engine of application state”
=RESTful Web Services ⌘=
*A Web API
-Works by REST principles

-Uses HTTP
*Four features
-the base URI for the web API

-Internet media type
-Operations supported by the web API

-Hypertext driven
=A RESTful Web Service Example ⌘=
* A simple RESTful Web service at:
URI = http://jmeterbook.aws.af.cm/person/list
* resource = list
* HTTP Get request to get list of persons
* Media type = application/json
(data in json format)
=A RESTful Web Service Example ⌘=
Create JMeter Test Plan:

[[File:REST 5.png|600px]]

=A RESTful Web Service Example ⌘=
Create HTTP Request

[[File:REST 6.png|600px]]

=A RESTful Web Service Example ⌘=
Create HTTP Header Manager

[[File:REST 7.png|600px]]

=A RESTful Web Service Example ⌘=
Run JMeter and view results in JSON

[[File:REST 8.png|600px]]

=JSON ⌘=
*RESTful Web services often use JSON for data exchange
(also use XML)
*Open standard data format
*Presents data as name:value pairs in a human readable text, e.g.
“Name” : “Value”
=JavaScript Object Notation ⌘=
* Originally derived from JavaScript
* Language-independent
* Available in many languages

=JSON Example ⌘=
Response from /person/list:
{ "id":46, "firstName":"Pete", "jobs":
[ { "id":5, "description":"Singer" } ],
"lastName":"George" },
=JSON Exercise ⌘=
Using Jmeter:
* Create a new HTTP Request to add a person to the list
* Need to Post to /person/save resource
=Why JSON and Web Services? ⌘=
* Easy to use
* Resilience
* Easily readable
* Better performance (low overhead)
=Easy to Use ⌘=
Basic Conventions:
[] List of objects

{} An object

“key”:”value” string values of an object defined under a key

“key”:value integer values of an object defined under a key
=JSON Resilience ⌘=
[[File:REST 9.png|600px]]

=Why JSON and Web Services? ⌘=
*Easily readable
[[File:REST 10.png|600px]]

=Less Performance Impact ⌘=
[[File:REST 11.png|800px]]

=JSON Standards ⌘=
* JSON Schemas are available
* Standards not as developed as XML/SOAP
* www.json.org promotes spread of JSON
=Quiz – No Prizes! No Pressure! ⌘=
[[File:REST 13.png|600px]]

=Exercises =

[[REST_API#Exercises|REST API Exercises]]

Web Services REST - Revision history

Lsokolowski: /* Exercises */