Short presentation for understanding web service concepts.

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Created by
Fabrício Epaminondas ©2015-2020
Web
SERVICES
Understanding

2. INTRODUCTION
The Insight

3. Impact of internet growing 3
The rising of
Service-Oriented-Architecture (SOA)
• Reusability
• Integration
• Interoperability

4. Initial approach 4
Application
Client RPC
RPC library
Transport
Application
Server RPC
RPC library
Transport
RPC = Remote Procedure Call

5. History 5
• RPC (Remote Procedure Call) solutions
•RMI
•Remote Method Invocation
•CORBA
•Common Object Request Broker Architecture
•And others
•Sun RPC, DCOM…

6. CORBA in a nutshell 6
IDL = Interface Definition Language

7. CORBA in a nutshell 7

8. CORBA: Java Client Sample 8

9. WHAT IS A
WEB SERVICE?
The Concepts

10. “A Web Service is a piece of business logic, located
somewhere on the internet, that is accessible
through standard-based Internet protocols, such as
HTTP or SMTP. Using a web service could be as
simple as logging into a site or as complex as
facilitating a multi-organization business negotiation.”
(David Chappel, Java Web Services).
10

11. Characteristics 11
•XML-based
•Loosely coupled
•Coarse-grained
•Ability to be synchronous or asynchronous
•Supports Remote Procedure Calls (RPCs)

12. Major Web Services Technologies 12
•Simple Object Access Protocol (SOAP)
Soap Envelope
Header
Body
SOP Envelope

13. Major Web Services Technologies 13
•Web Service Description
Language (WSDL)

14. Major Web Services Technologies 14
•Universal Description, Discovery, and
Integration (UDDI)

15. Major Web Services Technologies 15

16. Web Services and SOA Architecture 16
Registry
(
Service
Provider
"
Service
Consumer
"
1.
Publish
W
SDL
2. Query services
3. Response
W
SDL
4. XML service request
5. XML service response

17. CREATING A
WEB SERVICE
SOAP
The Practice

18. Practice: Web Service SOAP 18
• Sample Project using only Java 8
• Testing using SOAP UI

19. RESTful WEB
Services Basics
The Principles

20. The Principles 20
• Uniform Interface using using Uniform
Resource Identifiers (URIs)
• Client-Server
• Stateless
•Cacheable
•Layered System

21. When Use REST over SOAP 21
• REST is not protocol, rather a way of doing Web
calls over HTTP using XML or JSON
• Easy to use as it's a simple HTTP protocol with
JSON or XML
•Great for using with Javascript, AJAX, and
jQuery.
•Usually REST offers rapid operating speed
without the need of extensive processing.
• No standard authentication protocol.
• No standard data definition language.

22. Sample Architecture 22
O '
REST Client
REST
Service
Data
Server
) Internet

23. REST Basics 23
• Main HTTP Verbs
•GET
•POST
•PUT
•DELETE

24. REST Basics 24
• Define your API url
mysite.com/myapp/v1

25. REST Basics 25
• Design your Web Services operations
combining resources and verbs
Operations Definition
List Tickets GET /myapp/tickets
Get Single Ticket GET /myapp/tickets/<id>
Create Ticket POST /myapp/tickets
Update Existing Ticket PUT /myapp/tickets/<id>
Delete Existing Ticket DELETE /myapp/tickets/<id>

26. CREATING A
RESTful WEB
Service
The Practice

27. Practice: RESTful WEB Service 27
• Sample Project using Spring Boot
•Testing using Postman
github.com/fabricioepa/lab-springboot-rest-sample

28. !
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Created by
Fabrício Epaminondas ©2015-2020
FABRICIO EPAMINONDAS
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