WEB SERVICES Mahmoud Rabie – EGJUG 2006. W EB SERVICES The world before Situation Problems...

WEB SERVICES

Mahmoud Rabie – EGJUG 2006

WEB SERVICES

The world before

Situation

Problems

Solutions

Motiv. forWeb Services

Probs. withCurr. sols.

Web ServicesSolution

+ve and -ve ofWeb Services

Fund. OfWeb Services

Service Oriented

Arch.

Examples

Mahmoud Rabie Mahmoud - EGJUG 2006

AGENDA

WEB SERVICES

The world before


AGENDA

Situation

Problems

Solutions

Problems

SolutionsWEB SERVICES

The world before

Situation


The World Before Web Services

OrgA

System AJava

Windows

System B

.NET

Windows

System CC

++

Linux

OrgB

System A

.NET

Windows

System B

C++

Linux

Solutions

Problems

WEB SERVICES

The world before

Situation



OrgA

System AJava

Windows

System B

.NET

Windows

System CC

++

Linux

OrgB

System A

.NET

Windows

System B

C++

Linux

Problems

• Different types of platforms• Different types of programming languages

Solution

Create bridge

System APL A

Platform A

System BPL B

Platform BBridge

SolutionsSolutionsWEB

SERVICES

The world before

Situation



OrgA

System AJava

Windows

System B

.NET

Windows

System CC

++

Linux

OrgB

System A

.NET

Windows

System B

C++

Linux

Another Better Solutions

WEB SERVICES

The world before

Situation

Problems

Solutions





AGENDA

WEB SERVICES

The world before

Situation

Problems

Solutions





Problems with current solutions

• Involve a whole learning curve

• Not based on standardized rules and specifications

Module A

Module B

Module C

Module B

Module A

CORBA

CORBACORBA

RMI

WEB SERVICES

The world before

Situation

Problems

Solutions





Web Services

Standardized method of communication betweensoftware applications

Provide

ModuleB

ModuleA

C++ Java

Distributed components are interfaced via non-object-specific protocols

WEB SERVICES

The world before

Situation

Problems

Solutions






AGENDA

WEB SERVICES

The world before

Situation

Problems

Solutions






+ve and –ve of Web Services

Advantages of web services

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

WEB SERVICES

The world before

Situation

Problems

Solutions






+ve and –ve of Web Services

Advantages of web services

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.

WEB SERVICES

The world before

Situation

Problems

Solutions






+Ve and –Ve of Web Services

Disadvantages of web services

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.

WEB SERVICES

The world before

Situation

Problems

Solutions







AGENDA


WEB SERVICES

The world before

Situation

Problems

Solutions






Fundamentals of Web Services

Definition

A web service is a programmable component that provides a service and is accessible over the Internet.

Component

Instance

Instance

Instance

Client

Client

Client

Network


WEB SERVICES

The world before

Situation

Problems

Solutions







Web services stack


WEB SERVICES

The world before

Situation

Problems

Solutions







Web services stack

Service & Information Layer

Service Implementation

Web Service Interface(WSDL)

Types

Message

Operation

Port Type

Binding

Port

Service


WEB SERVICES

The world before

Situation

Problems

Solutions







<message name="getTermRequest"> <part name="term" type="xs:string"/> </message>

<message name="getTermResponse"> <part name="value" type="xs:string"/> </message>

<portType name="glossaryTerms"> <operation name="getTerm"> <input message="getTermRequest"/> <output message="getTermResponse"/> </operation></portType>

Web services stack

Service & Information Layer Example


WEB SERVICES

The world before

Situation

Problems

Solutions







Web services stack

Packaging Layer

Simple Object Access Protocol )SOAP( is a lightweight protocol designed for the exchange of information

Defines a modular packaging model and the encoding mechanisms for encoding data within modules.

SOAP

Envelope

Encoding rules

RPC representation


WEB SERVICES

The world before

Situation

Problems

Solutions







<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"SOAP-ENV:encodingStyle='http://schemas.xmlsoap.org/soap/encoding/"><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 stack

Packaging Layer


WEB SERVICES

The world before

Situation

Problems

Solutions







Web services stack

Protocol Layer

Any of the standard Internet protocols may be used to invoke web services over the network.

The initial definition focuses specifically on HTTP/1.1 and the encrypted HTTPS

FTP and SMTP can also be used

WEB SERVICES

The world before

Situation

Problems

Solutions






Service Oriented

Arch.


AGENDA

Service Oriented

Arch.


WEB SERVICES

The world before

Situation

Problems

Solutions






Service Oriented Arch.

It's an architectural style of building software applications that promotesloose coupling between components so that you can reuse them

WEB SERVICES Mahmoud Rabie – EGJUG 2006. W EB SERVICES The world before Situation Problems...

Documents

Transcript of WEB SERVICES Mahmoud Rabie – EGJUG 2006. W EB SERVICES The world before Situation Problems...