Building SOA-based Solutions for IBM System i Platform

116 Building SOA-based Solutions for IBM System i Platform

7.1 Project investments in developing a service

In wrappering existing business logic as a HATS Web service, you need to consider the

following items for using SOA:

򐂰 Analyze the current state of the business application.

򐂰 Consider the time frame for the prototyping and production of a services application.

You need to consider also the application development, expense, and deployment for

developing a Web service based application.

7.1.1 Analyzing an existing application

HATS Web service is a good solution where the existing applications can be driven using

macros. With some applications, where it is not possible to drive the application using a

macros, HATS Web service might not be a simple solution. You might require some

modifications to the existing application flow to automate it using a macro.

Consider the following scenarios in our Flight Reservation System sample application:

1. Flight Reservation Inquiry

This is a very simple scenario. The application window has only one input parameter and

based on the input, it retrieves data from the database table. This application transaction

can be driven easily with macro.

Let us look at the transaction details and the navigation required in completing the

transaction.

a. Start personal communication session to your System i5.

b. Run this command to add a library to the library list:

ADDLIBLE FLGHT400

c. Call the Flight Reservation System application:

GO FLGHT400/FRSMAIN

Chapter 7. HATS Web service 117

d. Enter 3 - Inquire on an Existing Reservation on the Flight Reservation main menu

panel and press Enter (see Figure 7-1).

Figure 7-1 Flight Reservation System main menu

e. You should see a logon panel. Enter Alex as agent name and mercury as the

password. Press F10.

f. Enter the order number 005530217 and press F10 to work with selection (see

Figure 7-2).

Figure 7-2 Order Selection panel

FRSMAINX 16:27:57 Flight Reservation System 7/29/06 SYSTEMI5

Select one of the following:

1. Create a New Reservation

2. Update an existing Reservation

3. Inquire on an existing Reservation

4. Delete an existing Reservation

5. Fax Reservation Information

10. Flight Reservation System Maintenance

20. Reservation System Reports

90. Signoff

Selection or command

===> 3

F3=Exit F4=Prompt F9=Retrieve F12=Cancel

F13=Information Assistant F16=AS/400 main menu

Flight Reservation System - Order Selection Panel System: SYSTEMI5

Type choices, press F10 to continue

Customer Name . . . . Name ( F4 to Select )

Date of Departure . . . . . . . . . 0000 00 00 Date ( F5 to Select )

Order Number . . . . . . . . . . . 005530217 Order Number

F2=Refresh F3=Exit F10=Work with Selection

118 Building SOA-based Solutions for IBM System i Platform

g. Review the order and press F3 or F12 to exit the Display Order panel (see Figure 7-3).

h. Press F3 to exit from Order Selection Panel.

Figure 7-3 Display Order panel

2. Flight Selection Search and Flight Reservation Transaction

First let us look at the Flight Reservation Transaction and learn about the data entry fields

and flow of the transaction:

a. Make sure that you are on Flight Reservation System main menu panel.

b. Enter 1 - Create a new Reservation on the Flight Reservation System main menu

panel.

c. You should see a logon panel. Enter Alex as agent name and mercury as the

password. Press F10.

Flights Reservation System - Display Order 16:44:46 7/29/06 SYSTEMI5

FLIGHT INFORMATION TICKET ORDER INFORMATION

Airline: DLT Flight: 5117009 Order Number...............: 005530217

Date of Flight..: 03 12 2004 Customer....: Aaronson, Linda

Class of Service - First...........:

From City: Little Rock Business........:

Economy.........: X

Depart Time.......: 07:54 AM

Number of Tickets..................: 01

To City...: Norfolk Price $.....................: 169.00

Tax $.......................: 6.76

Arrival Time......: 09:54 AM Total Due w/ Tax $..........: 175.76

F3/F12=Exit

Chapter 7. HATS Web service 119

d. Enter the date of the flight (Figure 7-4) for example:

09 12 2006

Figure 7-4 Create order: Date of flight

Flights Reservation System - Create Order 17:01:58 7/29/06 SYSTEMI5

Type choices, press F10 to Make Reservation

FLIGHT INFORMATION TICKET ORDER INFORMATION

Airline: Flight: 0000000 Order Number...............: PENDING

Date of Flight..: 09 12 2006 Customer...:

Class of Service - First...........:

From City.: Business........:

Economy.........: X

Depart Time.......:

Number of Tickets..................: 01

To City...: Price $.....................:

Tax $.......................:

Arrival Time......: Total Due w/ Tax $..........:

F2=Refresh F4=FROM Cities F5=TO Cities F6=Flights F7=Customers