What the New Enhancement Framework is for Part1

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What the New Enhancement Framework Is For – ItsBasic Structure and Elements For BeginnersThomas Weiss Business CardCompany: SAP AGPosted on Jan. 24, 2006 02:02 AM in ABAP, Beginner

Introduction

Has it ever occurred to you while looking at some complex technology, that you are lost as to what the technology is actually for? Have youever had doubts as to whether the complex technology was created exclusively for the entertainment of the developers? I confess that thisthought crossed my mind when I first faced the huge complexity of the new Enhancement Framework.

But after a second look I found that nothing could have been further from the truth. The "complexity" of this framework has a clear function,and the basic structure that serves to accomplish this function is actually pretty simple. In this weblog I want to explain what it is exactlythat the new Enhancement Framework, packaged with NetWeaver 2004s , provides the software developer. The Enhancement Framework isabout resolving an old conflict in software development: standard software solutions versus proprietary solutions. What the EnhancementFramework does is to combine the advantages of both the standard (easily maintainable) with the proprietary solutions (more flexible) whileavoiding the drawbacks of both standard software (lack of flexibility) and customized software (upgrade issues).

At the core of this framework is a simple structure consisting of a hook or an enhancement option and an implementation element you canattach there. You may already understand that enhancements are preferable to modifications. To take full advantage of what enhancementsover modifications offer, you will need the new Enhancement Framework. Its purpose: to offer you the ability to enhance the SAP standardsoftware and to organize these enhancement options and their respective implementation elements as effectively as possible. Don't expectto learn about all the technical details of the Enhancement Framework in this particular weblog, though. This weblog will solely cover thebasics of the framework. Once you have a clearer concept of the basics, you will see that the complex structures of the whole framework serve a lot of different functions and still not feel lost within these structures.

What SAP Does to Bridge the Gap between Standard Software and Proprietary Solutions

So much for the aim of this weblog; now let's start to understand the basic gap between standard software and customized software andhow the Enhancement Framework brings you the best of both worlds. (This is part 1 of the series on the Enhancement Framework. Part 2provides you with some more background knowledge on the framework, part 3 explains you to define a new BAdI, part 4 shows you how toimplement a new BAdI and to use filters, and in part 5 you learn how to work with source code enhancements.)

Standard software can have many advantages over proprietary solutions in terms of cost, ease and effort. But standard software is muchlike off-the-rack clothing. It doesn't always fit perfectly. There will probably be some aspects in which standard software does not optimallymeet the specific requirements of a process as it is realized in a particular customer company.

On the other hand, proprietary software is usually better suited to meet your specific requirements. Unfortunately having a non-standardsolution also means a lot of drawbacks. Surely, your company prefers to concentrate on the things it does best, be it building cars, sellingfood or whatever other core business and competences it has. So it isn't really a very attractive option to resolve standard solutionlimitations by maintenance and further development of a proprietary IT solution.

Of course, it would be great to have the best of both approaches: to have all the advantages of a standardized software solution whilehaving the flexibility of a highly customized solution. One way to accomplish this (at least to a certain extent) is to have a standard solutionthat can be adapted to the individual needs of your company. SAP has gone quite a long way in this direction.

Since SAP exposes and delivers the source code of all ABAP-based solutions, a customer theoretically could directly modify SAP coding. But,of course, this should happen only in a controlled way. It would do no good to change the source code in a totally ungoverned way. For thisreason SAP offered so far two different technological approaches to enable the customer to adapt SAP source code:

Modifications are changes of a SAP development object. These are supported and tracked by the Modification Assistant.Enhancements, on the other hand, do not change the SAP development object, but rather add something to it or enhance it. Up to now,there were so-called User Exits and Customer Exits where you could put in additional source code. Since release 4.6 there were alsoBADIs (Business Add-Ins). A BADI specifies an object-oriented interface that can be implemented by a customer.

The new Enhancement Framework, packaged with NetWeaver 2004s, is intended to unify these two approaches: the modifications and theclassic enhancement technology. Up to now it integrates all the new enhancement technologies such as the new BAdI, source code plug-ins,class enhancements, and function group enhancements. The framework brings with it flexibility so that you have the freedom to adapt asolution to your own needs while keeping all the advantages of a standard solution.

Simply stated, the new Enhancement Framework is an evolution of classic enhancement technologies. The concept of enhancing adevelopment object has some important advantages over modifying it. SAP has decided to optimize the enhancement technology in such away that you can now use enhancements in many of the situations where you formally needed to modify the source code.

Network Blog: What the New Enhancement Framework Is For – Its B... http://weblogs.sdn.sap.com/pub/wlg/3056

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The Limits of Modifications and Why Enhancements Are More Powerful

Modification has limits almost inherent in this very concept. You face these limits when upgrading or transporting a modified object. Imagineyou have a modified program in your system and your system is upgraded. What happens to your modifications? First, your modifications aregone, although you can re-insert them using the Modification Assistant. But reinsertion means a lot of work for you. You have to go throughyour whole program and look at all the modifications to see where they fit in the upgraded version of your program. Taking into account thefact that you often have many modified programs spread over one or many solutions, modifications generate a lot of work after an upgrade.Further limitations surface when you consider different modifications of the same development object from parallel or subsequentdevelopment systems. All of these problems stem from the fact that modifications are technically a part of the source code unit they modify.

And one source unit exists only once in a system. After an upgrade, a modified development object is first substituted by the unmodified onethat comes with the upgrade. In order to keep the modifications, you have to reinstate them in the new object.

Though the transaction SPAU offers you good support for this task, it is not at all a trivial task. If relevant parts of a development objecthave changed, you need expert knowledge of this object to reinsert the modifications. The administrator who runs the upgrade is mostprobably not able to merge the modifications properly. Instead of using your systems at once after the upgrade you need some developerswith expert knowledge of the relevant solutions to attend to the modifications. So you pay for the high flexibility modifications offer with a lotof additional work during upgrades.

When you have many modifications you surely want to organize them in some way. Unfortunately, as they technically belong to the programthey enhance, there is no possibility to group modifications. You cannot even organize them at all in a structure of their own. Changes to adevelopment object should, of course, be documented. Modifications can have no documentation attached to them in the system. It is alsonot possible to track who modified which parts of a development object.

Obviously all the limits of modifications originate from the fact that they are part of the object they modify. In contrast to modifications,enhancements are objects in their own right. If you enhance SAP code these enhancements are in your namespace, not in that of SAP. Theyare your objects.

Most of the advantages the Enhancement Framework offers are based on the fact that enhancements are objects in their own right. You canorganize enhancements in a structure of their own and document them in the system. You can transport them in units of their own. As faras upgrades and transports are concerned, you can transport enhancements from different systems into one system and keep all theseenhancements, plus the ones that exist in your target system. No enhancement gets lost.

This is the basic conceptual advantage that enhancements have over modifications. A major advantage of the new Enhancement Framework is that it unifies all the new enhancement technologies in one framework. It is this framework that realizes the advantages that are possiblebecause enhancements are objects in their own right: The enhancement framework enables management of different types of enhancements from different systems. They survive an upgrade without a lot of additional work. You can organize them in a structure of their own and document all the enhancements in the system.

Why and When to Change SAP Software

At this point you might ask yourself: Why should I change an SAP software solution at all? You should change a SAP solution only if you havecome to the conclusion that none of the possibilities of customizing meet your specific requirements. First try out everything that is possibleby means of customizing. If you are still in need of adjustments of the standard you should consider enhancements as the means of yourchoice. As enhancements are objects of their own they are quite robust in an upgrade. They will cause you far less work than modifications.In addition to this advantage concerning the work necessary for an upgrade, the new Enhancement Framework offers you a variety of usefulfeatures to manage, organize and document your enhancements. Just as enhancements have advantages over modifications, not allenhancement technologies within the new framework are equally suitable if you want to write highly structured code that causes as littlework as possible during update. But this will be explained in detail in another weblog in which you learn more about the details of theEnhancement Framework.

Understood in this way, the new Enhancement Framework isn't an open invitation to freely enhance your SAP solution in as many ways andmeans as are possible. The Enhancement framework can be compared to a powerful tool. Think of it like a high-end precision drill which willprobably not tempt you to sprinkle holes all over your walls and furniture. It is merely a comfortable professional means by which you drill ahole whenever you absolutely need to drill a hole. It is this attitude that you should have towards the Enhancement Framework. Withstandard software there may be a necessity to adapt to your needs. Whenever there is a necessity, use enhancements within the newEnhancement Framework.

The Basic Idea of the Enhancement Framework: How Do Modification- Free Enhancements Work?

Before going into more detail, you should now understand the basic idea of the Enhancement Framework. It provides a modification-freeenhancement technology, enhancing source code units without modifying them.

The basic mechanism is to offer so-called enhancement options in development objects. These enhancement options function like hookswhere you can attach the enhancements. The hooks are part of the development objects which can be enhanced. When you assign anenhancement to a hook, at runtime the enhancement is processed when the control flow reaches the hook. In other words: At runtime theenhancement behaves as if it belonged to the development object it enhances, while the enhancement as a transport object does notbelong to the enhanced object.

As this probably sounds a bit abstract let us have a look at a specific enhancement, the source code plug-in. At predefined positions in thesource code (for example, in a report) you have a particular type of enhancement option, that is an enhancement point. At these points youcan insert an enhancement that is called a source code plug-in. The respective plug-in is processed after the enhancement point is reached


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by the control flow. That is, the source code plug-in behaves at runtime as if it were part of the report while in fact it can belong to anotherpackage.

This is what a source-code plug in looks like:

Ignore the details of the source code enhancement for the moment. This particular example only serves to illustrate the point of howenhancements function: You have the anchor point or enhancement option, which is an enhancement point in our particular example. At thisenhancement point which is in the orange marked line the enhancement element 1 (in grey colour) is inserted. The spot flights_display_band the enhancement flights_display are units you should not be interested in at this point.

.In some way you can compare the enhancement technology with a closet system where you can insert different elements at particularpositions. You need not drill the wood in the side walls, but nevertheless you can attach boards and other elements where there are alreadyhooks or holders at important positions. The boards and other elements such as drawer or CD-holder look as if they were integral parts of the closet system while in fact they are only attached to the walls by hooks or holders.

The holder in our analogy corresponds to the enhancement options. The different elements you can attach there such as boards, drawers,CD- elements etc. behave like the enhancements. You can not attach a board to the closet system everywhere you like, but rather onlywhere a holder is prepared. In the same way you cannot enhance a development object anywhere, but only at predefined positions, whichare called enhancement options.

So irrespective of all further refinements, superimposed containers and their respective connections, the basic structure of how anenhancement functions is as simple as could be:

On the one hand, there are hooks or enhancement options where you can insert enhancement elements. Further on I will also speak of the definition side of the Enhancement Framework because it is there that the enhancement options are defined.On the other hand, there are the enhancement implementation elements that you can attach to a hook or an enhancement option.

The Complexity of the Enhancement Framework

Despite this simple structure the Enhancement Framework as a whole is pretty complex: You have different kind of enhancementtechnologies. At different kind of enhancement options you can attach different types of enhancement elements. The enhancement optionsare divided in two different classes: Implicit enhancement options which are provided by the framework and exist without any particularpreparation by a developer. Explicit enhancement options have to be inserted explicitly in the source code. These explicit enhancementoptions must belong to a container.

On the implementation side all implementation elements, regardless of whether they enhance implicit or explicit enhancement options,belong to other containers. The containers on the definition side and those on the implementation side are assigned to each other with aparticular cardinality.

All these different units form a complex structure despite the fact, that the basic concept of a single enhancement is so simple, as I have just shown you. But this structure is indispensable to accomplish all the aims the framework is made for. The Enhancement Framework ismade to organize and manage a huge mass of enhancement options and implementations of different types. And it is mainly this aspect thatrequires the high complexity.

You might ask yourself why you need the containers if you just want to create a single enhancement option and implement it. The answer isthat you hardly ever need only one enhancement. As good software is usually divided in components, one change (for example an additionalfield in a structure) necessitates a lot of other changes. And in real life programming it is not just you, but your team and many other teamsthat create and so have to mangage their enhancements options and implementations.

The framework not only offers you that s tructure to organize and manage your enhancement options and enhancements, but the compliancewith the framework is enforced by the tools. By adhering to the rules you can be sure that you can fully take advantage of the framework and you will never face a situation in which you have lots of unorganized enhancements in your system.

In the next weblog I will explain to you something further about the Enhancement Framework. I want to show you in which way it is


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complex and why this level of complexity is needed. The aim of this weblog simply was to tell you what the Enhancement Framework isabout, why it was developed and what the basic structure of an enhancement is like.

Thomas Weiss works in the SAP NetWeaver Product Management and has built elearning tutorials on ABAP topics.

Comment on this weblog

Showing messages 1 through 14 of 14.

Titles Only Main Topics Oldest FirstOrder in which Enhancement Options are used

2009-03-31 20:23:43 Joyreen Maceda Business Card [Reply]

Great blog!

I have also read in another article that these are the orders in which enhancement options will be used:

BAdI

Customer-Exit

User-Exit

Explicit Enhancement, Function and Class Enhancement

Implicit Enhancement

Do you also have a topic/blog that explains why?

Thanks thanks!

Order in which Enhancement Options are used

2010-05-12 07:24:19 Khaja Kamaluddin Business Card [Reply]

Superb blogBlog on enhancement

2009-02-17 03:18:32 priyanka negi Business Card [Reply]

Really good!!

Nice Blog on Enhancement Framework

2008-12-30 03:25:45 Surender Yadav Business Card [Reply]

This would really help the budding developers and framework is apt technology to enhance SAP with any modification.

How to get the list of standard programs where enhancement points have been defined

2008-10-18 17:06:30 Thierry Guegan Business Card [Reply]

How can I get the list of standard programs where enhancement points have been defined

How to get the list of standard programs where enhancement points have been defined

2008-10-20 12:16:29 nick whewell Business Card [Reply]

try se95 for a list of modifications and enhancements (note corrections, modifs using modif.assistant and of course enhancement

framework objects)

Thank you


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2008-09-26 18:51:36 Aaron sun Business Card [Reply]

I began to understand the New enhancement Framework after reading your article.

its very useful for beginners

2008-08-26 00:02:10 Venkata Reddy Avula Business Card [Reply]

Hi Thomas,

Thanks a lot. now i got good idea on frame works

Rgds

Venkat

great architecture

2006-01-26 06:43:12 Bertrand LAFOUGERE Business Card [Reply]

I'm pretty impress by that new "enhancement framework" and as facing customer specifics needs every day It's clearly the SAP respons

I was waiting.

Today there is 2 sides concerning the implementation of specifics needs (to extend SAP standards).

The "holy" side "copy the standard" (majority of people I think) and the other side "modify the standard".

Real implementation show most of the time that evolution, maintenability and upgrade are less "costly" with modifying the standard

than copying it. However modifying a standard make it loose it's SAP support (or an urban legend said so ...).

One of the best practise we came too was modifying the standard using customer specific BADI (see "Sergei Korolev" weblog "The time

for me to have a BADi of my own" => https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/1370 ).

I see that SAP "technicaly speaking" go in that direction and even more sot it's awesome. I would also note that it's a major victory of

the minority side "modify the standard" against the "copy the standard" side :D.

Thanks

2006-01-24 11:50:18 Peter Inotai Business Card [Reply]

Hi Thomas,

Thanks for this great weblog, I'm looking forward to the next one about this topic.

Regards,

Peter

Nice One!

2006-01-24 05:58:07 Abdul Hakim Business Card [Reply]

Hi Thomas,

There are lots of misconception that SAP has stopped delivering its products using ABAP and Java will be used for all new

developments.But the New Enhancement Framework says that it is false.If SAP is using Java for new development then why we need

New Enhancement Framework!!.

Very nice weblog.Keep up ur good work..


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Thanks,

Abdul

Nice One!

2006-01-24 09:26:53 Dirk Feeken Business Card [Reply]

It was probably not Thomas' main goal to clarify this misunderstanding. But if it helps to correct the false impression that SAP will

abandon ABAP development, so much the better.

Dirk

ABAP and Mark Twain

2006-01-24 10:34:39 Marilyn Prat t Business Card [Reply]

To quote Mark Twain, "The rumors of my death have been greatly exaggerated"

ABAP from this article can be seen as alive and well and constantly evolving.....whatever the rumors may be.

Thanks to Thomas for a very good account of why we should keep an eye on the very much alive Enhancement Framework.

cheers,

Marilyn

ABAP and Mark Twain

2009-07-13 00:24:50 Lootens Jurgen Business Card [Reply]

I love hat quote :) Get's a smile every time.

Maybe one of the many reasons SAP has incorporated Java technology is to learn from it and from the open source world

and incorporate all the good stuff it finds into the ABAP world.

Showing messages 1 through 14 of 14.


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