OPM-Compatible Application

Example of OPM-Compatible Program

Figure 6

shows the run-time

view

of

a

sample

application where you might

OPM-compatible program. The

OPM application consisted of a CL program and

two RPG programs. In this

example,

one

of

the RPG programs has been

ILE; the

remaining programs

are

unchanged.

 

Job

Default Activation Group

*PGM(X)

OPM CL

*PGM(Y)

ILE RPG

*PGM(Z)

OPM RPG

Figure 6. OPM-Compatible Application

Effect of ILE

The following deals with the effects of ILE on the way your applicat

Program call

OPM programs behave as before. The system automatically

 

 

creates

 

the

 

OPM

default

activation

group

when

you start

yo

 

and all OPM applications run in it. One

program

can

call

anoth

 

program

in

the

default

activation

group

by

using

a

dynamic

Data

Storage

for

static

data

is

created

when

 

the program

is

 

 

and it exists until the

program

is

deactivated.

When

the

 

ends (either normally or abnormally), the program's storage i

 

deleted. To clean up storage for a

program

that

returns

w

 

ending,

use

the

Reclaim

Resource

(RCLRSC)

command.

 

 

 

 

Files

File

processing

is

the

same

as

in

previous

releases.

Files

 

closed

when

the

program

ends

normally

or

abnormally.

 

 

 

Errors

As in

previous

releases,

the

compiler

handles

errors

within

 

program separately. The errors you see that originated wi

 

program are the same as before. However, the errors are

 

communicated

between programs

by

the

ILE

condition

manager,

 

so you may see different messages

between

programs. The

 

 

sages may have new message

IDs,

so

if

your

CL

program

mon

 

tors

for

a

specific

message ID,

you

may

have

to

change

24 ILE RPG for AS/400 Programmer's Guide

Page 47 Page 49
Page 48
Image 48
IBM AS/400 manual Example of OPM-Compatible Program, Effect of ILE
Page 47 Page 49

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.
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