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REXXTOOLS for VSE/ESA - Extensions to the REXX Language on VSE/ESA
//-->
Solutions
Support
Trials
Contact
Basic
Services
SQL/DS
Services
Prerequisites
Productivity and Long-term
Maintainability
REXXTOOLS
expands the capabilities of REXX/VSE by giving
you the ability to construct REXX applications
which previously could only be written in assembler,
COBOL, or PL/1. The primary benefits of using
REXX and REXXTOOLS, rather than these other common
languages, involves productivity and long-term
maintainability. With REXX, you can develop applications
and utilities, as well as do reporting and prototyping
tasks, in much less time and with better accuracy.
Maintenance is improved since REXX is easy to
learn and use, and is virtually self documenting.
REXXTOOLS contains two components that may be
licensed and run together or separately. These
components are: Basic
Services and SQL/DS
Components.
Stretching
Your IT Budget
With today's constraints on Information Technology
budgets -- accompanied by downsizing and outsourcing
trends -- many managers are looking for ways to
do more with less. Together with REXX/VSE, the
REXXTOOLS development suite offers the kind of
value needed to lower your computing costs even
as you tackle more projects.
Productivity
Studies show that REXX programmers are among the
most prolific in the history of computing. Why?
Because REXX is easy to learn, and encourages
the experimentation which leads to rapid application
development. Coupled with the REXXTOOLS interfaces
to legacy data stores, REXX programmers can produce
applications more quickly and at a surprisingly
reduced cost relative to their COBOL, C, and PL/I
brethren. Typically, a REXX application is at
least 1/5 the size in lines of code of an equivalent
COBOL program. In terms of costs, this means that
a 2000 line COBOL program that costs $20,000.00
to develop (assuming $10.00/line) requires only
400 lines of REXX/REXXTOOLS code, and costs only
$4,000.00!
Availability
How much does down-time cost? The number varies
widely from organization to organization, and
from application to application. However, a rough
estimate can be derived by multiplying the number
of affected users by the hours of down time, and
multiplying that result by your company's fully-loaded
average hourly rate for labor. If, for example,
1000 users are affected for 1 hour, with a fully-loaded
average hourly rate of $30.00, the outage costs
your company $30,000.00.
In
the area of availability, REXX and REXXTOOLS have
unique advantages over other development environments.
Most significantly, REXX programs do not directly
address processor storage, which means that common
(and disastrous) programming errors, such as subscripting
out-of-bounds, cannot occur. Moreover, REXX programs
with the aid of REXXTOOLS, support numerous error
recovery options, making "bullet-proof"
applications an attainable goal.
Security
The REXXTOOLS interpretive compiler lets you secure
your valuable application logic from undesirable
browsing and/or modification. This gives your
REXX applications a security profile that is identical
to that of applications written in COBOL. In addition,
the REXXTOOLS VSAM and SQL/DS interfaces honor
all system security protocols, giving you protection
without introducing new security mechanisms.
Performance
Application performance is dependent on several
factors. For years most business applications
have been said to be "Input/Output bound",
meaning that more time was spent reading and writing
data than making computations. While interpreted
REXX certainly runs slower than compiled languages,
most REXX applications spend their time executing
I/O routines -- such as those provided by REXXTOOLS
-- which are implemented in assembler language.
As a consequence, many REXXTOOLS customers report
that their REXXTOOLS-based applications match,
and sometimes exceed, the performance of equivalent
COBOL or PL/I applications. Finally, REXXTOOLS
is compatible with the IBM REXX/370 compiler which
accelerates REXX programs to well within the performance
range of other high-level languages.
Standards
REXX is a Systems Application Architecture (SAA)
language that is implemented on every major IBM
platform. REXXTOOLS is also a cross-platform product
with implementations on the VSE/ESA and MVS/ESA
platform.
Investment
Conservation
Legacy data from VSAM and SQL/DS are easily accessed
by REXXTOOLS. No file or table definitions need
to be changed to use REXXTOOLS. Further, no application
changes are required. All System/390 numeric types
as well as all SQL/DS data types are supported.
And REXX and REXXTOOLS support full 4 digit dates,
ensuring that your applications will run in the
year 2000 and beyond.
Leveraging
Existing Skills
The REXXTOOLS interfaces have been designed to
mimic the popular system interfaces to VSAM, SQL,
and other system services. Programmers who are
already versed in these interfaces, will find
the learning curve for REXXTOOLS to be exceedingly
flat. What's more, because of its long association
with VM, many VSE programmers already know REXX.
And those programmers who are new to REXX, will
find that it is the easiest language they'll ever
have to learn.
Prerequisites
REXXTOOLS functions are seamlessly integrated
with REXX/VSE. To use REXXTOOLS functions, you
include a LIBDEF for access to the REXXTOOLS functions;
then you simply code references to these functions
and commands in your REXX programs using standard
REXX syntax.
REXX
System Software
VSE/ESA Version 1.3 requires the IBM Program Product:
REXX/VSE.
VSE/ESA Version 2.1 and above: No Prerequisites
(REXX/VSE is part of the Operating System).
Installation
Considerations
Installation of REXXTOOLS for VSE/ESA is easy
and non-disruptive to the operating system. Special
code is provided to allow multiple vendors to
seamlessly integrate their REXX function packages
with REXXTOOLS and REXX/VSE. REXXTOOLS functions
and Host Commands run in problem state.
REXXTOOLS
for VSE/ESA is provided on IBM 3480 tape cassette.
MHSP is used to install the tape.
©
Open Software Technologies,
Inc.
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