1. WEB SERVICES
Mahmoud Rabie – EGJUG 2006

2. Mahmoud Rabie Mahmoud - EGJUG 2006
AGENDA
Examples
Situation
Service
Oriented
Arch.
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

3. Mahmoud Rabie Mahmoud - EGJUG 2006
AGENDA
Situation
The world
before
Problems
WEB
SERVICES
Solutions
Mahmoud Rabie Mahmoud - EGJUG 2006

4. The World Before Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Java
The world
before
System A
Problems
Windows
Org B
Org A
WEB
SERVICES
.NET
Solutions
.NET
System A
Windows
System B
Windows
C++
C++
System C
Linux
System B
Linux
Mahmoud Rabie Mahmoud - EGJUG 2006

5. The World Before Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Problems
Different types of platforms
Different types of programming languages
Solution
Create bridge
Java
The world
before
System A
Problems
Windows
Org B
Org A
WEB
SERVICES
.NET
Solutions
.NET
System A
Windows
System B
Windows
System A
PL A
Platform A
C++
System B
PL B
Platform B
C++
System C
Bridge
Linux
System B
Linux
Mahmoud Rabie Mahmoud - EGJUG 2006

6. The World Before Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Another Better Solutions
Java
The world
before
System A
Windows
ٌRMI
Org B
Org A
EDI
WEB
SERVICES
.NET
Solutions
.NET
ebXML
System A
Solutions
Windows
System B
Windows
C++
C++
CORBA
COM
System C
Linux
System B
Linux
Mahmoud Rabie Mahmoud - EGJUG 2006

7. Mahmoud Rabie Mahmoud - EGJUG 2006
AGENDA
Situation
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

8. Problems with current solutions Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Involve a whole learning curve
Not based on standardized rules and specifications
The world
before
Problems
WEB
SERVICES
Solutions
Module A
Module B
CORBA X
Probs. with
Curr. sols.
CORBA
Motiv. for
Web Services
CORBA
Module C
Web Services
Solution
Module A
Module B
RMI
Mahmoud Rabie Mahmoud - EGJUG 2006

9. WEB Web Services Distributed components are interfaced SERVICES
Provide
Situation
Standardized method of communication between
software applications
The world
before
Problems
WEB
SERVICES
Solutions
Distributed components are interfaced
via non-object-specific protocols
Probs. with
Curr. sols.
Motiv. for
Web Services
Module A
Module B
Web Services
Solution
C++
Java
Mahmoud Rabie Mahmoud - EGJUG 2006

10. Mahmoud Rabie Mahmoud - EGJUG 2006
AGENDA
Situation
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

11. +ve and –ve of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Advantages of web services
The world
before
Web services provide interoperability between various software applications running on disparate platforms/operating systems
Web services use open standards and protocols
By utilizing HTTP, web services can work through many common firewall security measures without requiring changes to the firewall filtering rules. Other forms of RPC may more often be blocked
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

12. +ve and –ve of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Advantages of web services
The world
before
Web services allow software and services from different companies and locations to be combined easily to provide an integrated service.
Web services allow the reuse of services and components within an infrastructure.
Web services are loosely coupled thereby facilitating a distributed approach to application integration.
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

13. +Ve and –Ve of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Situation
Disadvantages of web services
The world
before
Web services standards features such as transactions are currently nonexistent or still in their infancy compared to more mature distributed computing open standards such as CORBA.
Web services may suffer from poor performance compared to other distributed computing approaches such as RMI, CORBA, or DCOM.
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

14. Mahmoud Rabie Mahmoud - EGJUG 2006
AGENDA
Situation
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

15. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Definition
A web service is a programmable component that provides a service and is accessible over the Internet.
Situation
The world
before
Problems
Network
WEB
SERVICES
Client
Solutions
Instance
Component
Probs. with
Curr. sols.
Client
Instance
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Client
Web Services
Solution
Instance
Mahmoud Rabie Mahmoud - EGJUG 2006

16. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Web services stack
Situation
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

17. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Web services stack
Situation
The world
before
Service & Information Layer
Problems
WEB
SERVICES
Types
Solutions
Message
Operation
Service
Implementation
Probs. with
Curr. sols.
Port Type
Motiv. for
Web Services
Binding
Fund. Of
Web Services
+ve and -ve of
Web Services
Port
Web Services
Solution
Web Service Interface
(WSDL)
Service
Mahmoud Rabie Mahmoud - EGJUG 2006

18. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Web services stack
Situation
The world
before
Service & Information Layer Example
Problems
<message name="getTermRequest">
<part name="term" type="xs:string"/>
</message>
<message name="getTermResponse">
<part name="value" type="xs:string"/>
<portType name="glossaryTerms"> <operation name="getTerm"> <input message="getTermRequest"/> <output message="getTermResponse"/> </operation> </portType>
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

19. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Web services stack
Situation
The world
before
Packaging Layer
Problems
Simple Object Access Protocol (SOAP) is a lightweight protocol designed for the exchange of information
WEB
SERVICES
Solutions
Defines a modular packaging model and the encoding mechanisms for encoding data within modules.
Probs. with
Curr. sols.
Envelope
Motiv. for
Web Services
SOAP
Fund. Of
Web Services
Encoding rules
+ve and -ve of
Web Services
Web Services
Solution
RPC representation
Mahmoud Rabie Mahmoud - EGJUG 2006

20. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Web services stack
Situation
The world
before
Packaging Layer
Problems
<SOAP-ENV:Envelope xmlns:SOAP-ENV=" SOAP-ENV:encodingStyle=
' <SOAP-ENV:Header>A2B Header</SOAP-ENV:Header> <SOAP-ENV:Body> <SubmitEventRequest> <Source>Copier54321</Source> <Description>
MotorFailure
</Description> </SubmitEventRequest> </SOAP-ENV:Body> </SOAP-ENV:Envelope>
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

21. Fundamentals of Web Services Mahmoud Rabie Mahmoud - EGJUG 2006
Web services stack
Situation
The world
before
Protocol Layer
Problems
Any of the standard Internet protocols may be used to invoke web services over the network.
WEB
SERVICES
Solutions
The initial definition focuses specifically on HTTP/1.1 and the encrypted HTTPS
Probs. with
Curr. sols.
Motiv. for
Web Services
FTP and SMTP can also be used
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

22. Mahmoud Rabie Mahmoud - EGJUG 2006
AGENDA
Situation
Service
Oriented
Arch.
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006

23. Mahmoud Rabie Mahmoud - EGJUG 2006
Service Oriented Arch.
Situation
It's an architectural style of building software applications that promotes
loose coupling between components so that you can reuse them
Service
Oriented
Arch.
The world
before
Problems
WEB
SERVICES
Solutions
Probs. with
Curr. sols.
Motiv. for
Web Services
Fund. Of
Web Services
+ve and -ve of
Web Services
Web Services
Solution
Mahmoud Rabie Mahmoud - EGJUG 2006