Managing Dynamically-Allocated Storage

procedures in the module DYNARRAY dynamically allocate storage for a pr unbounded packed array. The procedures in the module perform the foll actions on the array:

¹Initialize the array

¹ Add an element to the array

¹ Return the value of an element

¹Release the storage for the array.

DYNARRAY

performs these

actions

using the three ILE bindable storage A

CEECRHP (Create

Heap),

CEEGTST

(Get Storage), and

CEEDSHP

(Discard

Heap),

as

well

as the REALLOC operation codeSystem.

SeeAPI theReference

for

specific

information

about

the storage management bindable APIs.

Figure 54

shows

the

/COPY

file

DYNARRI containing the prototypes for the

dures

in

DYNARRAY.

This

/COPY file is

used by

the

DYNARRAY module as

as

any

other

modules

that

call

the

procedures in

DYNARRAY.

DYNARRAY has been defined for use with a (15,0) packed decimal array easily be converted to handle a character array simply by changing t DYNA_TYPE to a character field.

 

*=================================================================

 

* DYNARRAY :

Handle a (practically) unbounded run-time

 

*

Packed(15,0) array.

The DYNARRAY module contains

 

*

procedures to allocate the array, return or set

 

*

an array value and deallocate the array.

 

*=================================================================

D DYNA_TYPE

S

15P 0

 

D DYNA_INIT

PR

 

 

D DYNA_TERM

PR

 

 

D DYNA_SET

PR

 

 

D

Element

 

 

VALUE LIKE(DYNA_TYPE)

D

Index

 

5I 0

VALUE

D DYNA_GET

PR

 

LIKE(DYNA_TYPE)

D

Index

 

5I 0

VALUE

 

 

Figure

54. /COPY file DYNARRI containing prototypes for DYNARRAY module

Figure 55 on page 121 shows the beginning of module DYNARRAY containing th Control specification, and Definition specifications.

120 ILE RPG for AS/400 Programmer's Guide

Page 144
Image 144
IBM AS/400 manual SeeAPI theReference, Dynarray

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.