Web Service - TUtorial 6 (Answer)

8/3/2019 Web Service - TUtorial 6 (Answer)

1/9

Tutorial 6

1. List and describe the main categories of Web Services in detail.

Answer:

- Microsofts .Net Framework

Windows is well established as the most popular desktop environment, and many

developers use Microsoft tools for both client-and server-side applications. Microsoft is

adding Web services support throughout its .NET platform, in which every program is

potentially a Web service, and all transports can use XML protocols.

- Application servers

The J2EE community, comprised of application server vendors, is adding Web services

application programming interfaces (APIs) to Java servlets, classes, and beans, makingXML integration and Web services part of the core application server definition.

- Integration brokers

Vendors in this middleware market segment are using Web services for enterprise

application and business-to-business (B2B) integration, bridging Web services

applications inside and outside the firewall.

- Database vendors

Vendors in this group are focusing on the use of Web services to provide a means of

accessing database tables and stored procedures.

- ERP, CRM, and othersThese packaged application vendors are adding Web services interfaces for integrating

those packages with other packages and software systems.

- Web services platform

Vendors in this market segment are developing and supplying Web services

infrastructure products as independent, or self-contained, products.

Page 1 of 9

Tunku Abdul Rahman College

Advanced Diploma in Science

AACS5274

Web Services


2/9

2. With the aid of diagram, demonstrate how each implementation architecture work.

a. An application server exposes back-end technologies using a Web Service interface.

Answer:

Web services map messages to server objects

As Web services are not executable, much of the value in the development

environment, such as J2EE and the .NET Framework, remains within theprogramming languages beneath the Web services. Web services represent

another means of exchanging information with the application server, which

still performs the main job of application development and integration.

The programs and classes represent a variety of back-end technologies

accessed using the application server, including Enterprise JavaBeans, .NET

classes, message queues, and CORBA objects.

b. Web Service interface is used to access database tables and stored procedure.

Answer:

Web services map messages to databases 2-tier

This Web services implementation architecture in which a Web services interface is

used to access a database table or a stored procedure.

Page 2 of 9


3/9

c. In an integration broker architecture, a web services interface map to A2A and B2B product.

Answer:

Web services map message to queues

This Web services implementation architecture in which a Web services interface maps

directly to a queued message system, such as Java Messaging Service (JMS) or to a

B2B server.

In both cases, the SOAP message is treated as input to an asynchronous

communication system for processing.

The message is stored in a persistent queue or database and is forwarded to anotherqueue for processing.

Finally, results are written to a reply queue. In this way, Web services represent

another way into and out of existing B2B and application-to-application (A2A)

integration broker products.

For an integration broker vendor, the main value remains within the adapters,

transformers, routers, and other parts of the toolkit.

d. A web services can be implemented for packaged application architecture.

Answer:

Web services map messages to packaged applications

Figure 6.4 illustrates the Web services implementation architecture for

packaged application software such as ERP, CRM, and accounting/billing

systems.

For an ERP or a CRM system, the primary value remains in the features and

functions of the software package as related to business operation support.

Web services, therefore, basically represent getting data in and out, albeit a

widely adopted and supported.

Packaged-application software vendors, such as Baan, PeopleSoft, SAP, Siebel,

and others, also are offering integration products using Web services

technology.

Page 3 of 9


4/9

e. A web services broker focusing value on the Web services lay on.

Answer:

Web services brokers integrate them all Figure 6.4 illustrates the Web services implementation architecture that focuses

on the value inherent in the Web services layer.

Web services have value because they are widely adopted and implemented,

allowing multiple disparate software domains to be integrated.

Require certain functionality: process flow, security, reliable messaging,

transactions, and so on.

Web services brokers, such as IONA's, XMLBus Edition, are built to provide

this value. In this way, disparate software domains are bridged, multiple vendor

Web services implementations are joined, and new applications are created

from a combination of old ones.

Page 4 of 9


5/9

3. Compare and contrast the .NET and J2EE in the Web Service implementation platform.

Answer:

CRITERIA J2EE FRAMEWORK .NET FRAMEWORK

Fundamental Design and

Support for Web Services

Support for Web Services is

through a pack of APIs such

as Java API for XML

Messaging (JAXM), Java

API for XML Processing

(JAXP), Java API for XML

Registries (JAXR), and Java

API for XML-based RPC

(JAX-RPC).

Web Services are built right

into the platform and

Microsoft .NET framework

provides ready support for

Web Services standards such

as SOAP, WSDL, and

UDDI.

Implementation The implementation of Web

Services in J2EE will

typically be done through

Enterprise JavaBeans(EJBs). You can, however,

also have standalone Java

applications providing Web

Services implementation. It

all depends on how the

business processing and data

logic layer of an application

is designed and built.

The implementation of Web

Services in .NET framework

will typically be done in

.NET managed components,including managed classes

and COM/COM+

components.

Pricing Expensive as compared to

MS.NET, however, if a

company already has a

J2EE-based application

server platform, it makes

much more sense to use the

existing infrastructure and

assets.

Much cheaper as compared

to J2EE-based application

servers. J2EE, however, is

still a better choice for

industry-strength server side

applications.

Tools and Servers There are multiple

companies that have built

IDEs and application serversbased on J2EE. A majority

of these companies have

already started supporting

Web Services creation,

deployment and execution

within their products.

The level of sophistication

and support for Web

Services standards differs

from product to product.

Microsoft's cornerstone

development tool (IDE ?

Integrated DevelopmentEnvironment) for Web

Services is Visual Studio

.NET, sure to be as popular

as their robust and easy to

use Visual Studio.

Web Services enabled

servers from Microsoft

include BizTalk 2002 and

SQL Server 2000.

Promoting Companies Multiple (independent) All the tools, servers, and

Page 5 of 9


6/9

companies including IBM,

BEA Systems, Oracle, HP,

Sun Microsystems. All these

companies will be providing

support for Web Services in

their J2EE-based

development tools and

application servers.

This is a comforting factor,

as there are competing

products in this technology,

which also means that there

is no monopoly of a single

company.

technology are controlled by

a single company ?

Microsoft.

Although there is no

question about Microsoft's

stability and commitment

towards Web Services

technology, without

competition ? the technology

promoted and offered may

not be the best.

Maturity of Platform J2EE has proven to be a

robust, scalable and a matureplatform over the last four

years. Addition of support

for Web Services is just

another feature for this

platform.

Although .NET inherits a lot

of features from WindowsDNA architecture, it is still

relatively new and has to

prove itself to be able to

offer an enterprise-wide

framework.

4. Does .NET mean an Internet operating system? Discuss?

Answer:

Does .NET Mean an Internet Operating System?

Bill Gates's announcement of .NET included a description of .NET as the equivalent of

Windows for the Internet. If you had a service you relied on within the Windows operating

system in the past, he said, in the future you would rely on the equivalent service over the

Internet. If you needed to store a file, set a date in your calendar, send e-mail, or invoke any

type of programmatic service, you would do so using .NET or Web services instead

of using an operating system service.

This vision is as broad and compelling as it is fantastic. Imagine depending on the Internet or a

Web service the way you'd rely on a desktop operating system service! Still, the idea of

assembling applicationsand computing platformsout of standard components, the way

you'd put together a PC, signifies great potential change in software development and

deployment.

Page 6 of 9


7/9

5. Implementation architectures of Web Services vary according to the degree to which the Web services

layer is apportioned value in the overall solution. Suggest and explain one of the implementation

architectures of Web Services in detail, support your answer with a diagram.

Answer:

Any of the following implementation architecture will be accepted (with a diagram andexplanation).i. An application Server exposes back-end technologies using a Web services interface

Figure above illustrates the Web services implementation architecture in which .NET and J2EEapplication servers expose programs and classes as Web service components. The programsand classes represent a variety of back-end technologies accessed using the applicationserver, including Enterprise JavaBeans, .NET classes, message queues, and CORBA objects,to name a few

ii. A web services interface is used to access database tables and stored procedures

figure above illustrates the Web services implementation architecture in which a Web servicesinterface is used to access a database table or a stored procedure. This type of access can bethought of as a two-tier architecture, unlike the application server architecture, which includes amiddle tier for business logic that is developed and managed independently of the back tier fordata access.

iii. In an integration broker architecture, a Web services interface maps to A2A and B2Bproducts

Page 7 of 9


8/9

Figure 8-3 illustrates the Web services implementation architecture in which a Web servicesinterface maps directly to a queued message system, such as Java Messaging Service (JMS)or MQSeries, or to a B2B server, such as IONA's Orbix E2A Collaborate. In both cases, theSOAP message is treated as input to an asynchronous communication system for processing.The message is stored in a persistent queue or database and is forwarded to another queue forprocessing. Finally, results are written to a reply queue. In this way, Web services representanother way into and out of existing B2B and application-to-application (A2A) integration broker

products. For an integration broker vendor, the main value remains within the adapters,transformers, routers, and other parts of the toolkit.

iv. A web services interface can be implemented for a packaged application architecture

Figure 8-4 illustrates the Web services implementation architecture for packaged applicationsoftware such as ERP, CRM, and accounting/billing systems. For an ERP or a CRM system,the primary value of the application remains in the features and functions of the softwarepackage as related to business operation support. Web services, therefore, basically representanother means of getting data in and out, albeit a widely adopted and supported means.Packaged-application software vendors, such as Baan, PeopleSoft, SAP, Siebel, and others,also are starting to offer integration products using Web services technology.

v. A web services broker focuses on value in the Web service layer- put all together.

Figure 8-5 illustrates the Web services implementation architecture that focuses on the valueinherent in the Web services layer. A business process flow engine or other means oforchestration lies at the center of the value proposition in this architecture, which depends onthe relationship among Web services to achieve or to create new applications at a higher levelof abstraction. In other words, Web services have value because they are widely adopted andimplemented, allowing multiple disparate software domains to be integrated. The process ofintegrating such domains requires certain functionality above the core Web services standards,such as process flow, security, reliable messaging, transactions, and so on. Web servicesbrokers, such as IONA's Orbix E2A XMLBus Edition, are built to provide this value. In this way,disparate software domains are bridged, multiple vendor Web services implementations arejoined, and new applications are created from a combination of old ones.

Page 8 of 9


9/9

6. Categories of Web Services vary according to the degree to which Web Services layer is apportioned

value in the overall circumstances. List and describe FIVE (5) main categories of Web Services in

detail.

Answer:

- Microsofts .Net Framework

Windows is well established as the most popular desktop environment, and many

developers use Microsoft tools for both client-and server-side applications. Microsoft is

adding Web services support throughout its .NET platform, in which every program is

potentially a Web service, and all transports can use XML protocols.

- Application servers

The J2EE community, comprised of application server vendors, is adding Web services

application programming interfaces (APIs) to Java servlets, classes, and beans, making

XML integration and Web services part of the core application server definition.

- Integration brokers

Vendors in this middleware market segment are using Web services for enterprise

application and business-to-business (B2B) integration, bridging Web services

applications inside and outside the firewall.

- Database vendors

Vendors in this group are focusing on the use of Web services to provide a means of

accessing database tables and stored procedures.

- ERP, CRM, and others

These packaged application vendors are adding Web services interfaces for integrating

those packages with other packages and software systems.

- Web services platform

Vendors in this market segment are developing and supplying Web services

infrastructure products as independent, or self-contained, products.

7. A local Business-to-Business (B2B) company needs to adapt Web Services technologies to the current

system to improve their system efficiency. With the aid of a diagram, suggest the most appropriate

Web Services implementation architecture for the company mentioned.

Answer:

Figure illustrates the Web services implementation architecture in which a Web services

interface maps directly to a queued message system, such as Java Messaging Service (JMS) or

MQSeries, or to a B2B server, such as IONA's Orbix E2A Collaborate. In both cases, the SOAP

message is treated as input to an asynchronous communication system for processing. The

message is stored in a persistent queue or database and is forwarded to another queue for

processing. Finally, results are written to a reply queue. In this way, Web services represent

another way into and out of existing B2B and application-to-application (A2A) integrationbroker products. For an integration broker vendor, the main value remains within the adapters,

transformers, routers, and other parts of the toolkit.

Page 9 of 9

Documents

Web Service - TUtorial 6 (Answer)