Tài liệu Activity 2.1: Identifying Services doc

Activity 2.1: Identifying Services
In this activity, you will identify service classes for the Ferguson and Bardell,
Inc. case study. After these service classes have been identified and classified,
you will answer a series of questions relating to services-based design and
discuss your answers with the instructor and the rest of the class.
Objectives
After completing this activity, you will be able to:
• Categorize services as user, business, or data services.

Before You Begin
This activity will be performed individually, with a class discussion following
the activity.
Time to complete this activity: 25 minutes
Scenario
Your company has identified the need for a company intranet with a variety of
information and features that will assist employees. The Human Resources
(HR) department has identified the following needs:
!
Time and attendance. HR wants all employees to be able to access time and
attendance features so that they can check their vacation and sick leave and
review their benefits.
!
Retirement plan information. Employee 401K information needs to be made
available via the intranet. This information will be drawn over the Internet
from an investment company database, stored locally at the company, and
then formatted for display on the corporate intranet.
!
Job listings. The current paper process for submitting résumés needs to be
electronic. Résumés will be submitted electronically from the employee’s
desk. After submission, the résumé will be automatically scanned for a set

of common keywords to assist HR in matching candidates to jobs. The
résumé will then be stored in a private HR database.

6 Activity 2.1: Identifying Services




Exercise 1:
Identifying Service Classes
In this exercise, you will analyze a set of business requirements identified by
your company to address their business needs. You will categorize services
necessary to design a solution that meets these needs according to type: user,
business, or data.
!
Identify user, business, and data services
1. Read the activity’s scenario. The services needed to provide the
functionality expressed in the scenario are listed in the following grid.
2. Identify each service’s type: user, business, or data.
Service Type

Check HR information (sick days, vacation days,
and so on)
User
Determine days worked
Business
Determine retirement present value
Data
Retrieve individual 401K account balance
Data

Retrieve current bond prices
Data
Submit résumé
User
Scan résumé
Business
Store résumé
Data
Process résumé
Business

3. Answer the following questions.
a. How have you approached design in the past?
Answers can vary.


b. What benefits would services-based design bring to your environment?
Answers can vary.
Services-based design describes service tiers constructed from a
logical network of service components rather than from two or three
monolithic tiers of application logic. Each service can live on a
variety of platforms and in varying locations. One of the major
advantages of services-based design is the ability to do more than
one development task at a time. Because logic and actions are
separated into services, a development team can be assigned to each
service layer of the solution and can take advantage of the team’s
experience with and preferences for different development tools and
technologies. Resource sharing is a vital aspect of solution design.
Generally, a corporation designs and creates each solution with its
own development team. The end result is usually that no two

solutions from the same company are alike. Business logic and user
interface (UI) logic are recreated by each development team’s UI
Activity 2.1: Identifying Services 7




and services group. The varying skill levels of these groups produces
unpredictable results, and solutions do not necessarily complement
each other. Services-based design provides the ability to share an
organization’s assets and skills so that disparate applications are
brought together into a cohesive application-development strategy.


c. What typically belongs at each service layer?
The user services layer provides and structures information to
simplify its presentation to the user interface. The business services
layer contains the business rules and application code to execute
these rules programmatically. The data services layer provides the
standard create, retrieve, update, and delete data services, as well as
data calculations, summations, and validation.


d. What boundaries did you use for determining service types? Did the
boundaries differ between (a) time and attendance, (b) retirement plan
information, and (c) job listings?
Answers can vary.


e. Which was the easiest type of service to identify? Why was this type of

service easier to identify than the other two types?
Answers can vary.





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