Interfaces to Components

Hello,
I'm currently creating a component that I would like to reuse in other components. I know the way to include this component is via the interface view of the component, but how do I create implementation specific code depending on which component I include the interface in?
For example, I have component X and I want to use X in components A and B. I also have method 1 in component X, but depending on if I include the component in A or B determines what the implementation of method 1 should be. I have not figured out an elegant way to do this yet, and the "Implemented Interfaces" under the component interface looks promising, but I can't get that to work.
I might be entirely off on how I'm developing my overall Web Dynpro application. The idea I'm using is creating a bunch of components to reuse and then consolidating all of the interfaces in one big component and make that the final application. Is this the correct approach?
Thanks,
Dustin

Hi Dustin,
you can define interfaces at the "Web Dynpro Component Interfaces" node of a WD project via the context menu->"Create Component Interface Definition".
The interface definition includes:
1. The declaration of the interface controller, including Context structure, Events and Methods.
2. Zero to multiple Interface View Definitions with the requested Inbound- and Outbound plugs.
3. Models which should be used by the implementing components.
Interface(s) can be added to the "Implemented Interfaces" of a WD component. Each IFView definition of the interface will be created as a Window in the implementing component, the Component Interface Controller will "inherit" the properties/methods you declared in the interface and the model references will be added to Used Models of the component by the toolset.
It should be possible to do what you want using this great feature.
Hope that helps.
Regards
Stefan

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debug_info in varchar2 := 'false',
compress_buffer in varchar2 := 'false',
optimize_buffer in varchar2 := 'true'
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end;
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Is it sound like Oracle Portal?
But you want to save a layer 9iAS.
Basically, that was the WebDB.(Oracle changed the name to Portal when version 3.0)
Over all, I agree with you.
>>Having a Oracle database as the central location for all components has many
>>advantages:
>>
>>- Unique point of maintenance, backup and restore
>>- Integrated database security
>>- One language for everything, PL/SQL or Java (even both if desired)
>>- Inherited database cache, transaction and processing optimizations
>>- Direct access to the database dictionary
>>- Application runs on Oracle which has support for many platforms.
>>- Transparent use of parallel processing, clusters and future
>>background technologies
I would like to build 'ZOPE' inside Oracle DB as a back-end
Using Flash MX as front-end.
Thomas Ku.

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Ta

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hi gurus
can anyone explain me what is interface
tahnk you
regards
kals.

hi
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 METHOD intf~meth.
 ENDMETHOD.
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 DATA obj TYPE REF TO intf.
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 ALIASES <alias name> FOR intf~comp.
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Ronnie
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Hello,
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Calling a method in DC1 from DC2

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hi rahul,
in additon to sharma's
check this
Re: Interfaces to Components
Re: Reuse of Component
when to use the
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/604ddc2f-ec9c-2b10-1682-be37e1c62dee
http://help.sap.com/saphelp_nw04s/helpdata/en/02/6755bd296ade42931646f869b1fd15/frameset.htm
complex conditons
https://www.sdn.sap.com/irj/scn/wiki?path=/display/wdjava/use%252bcomponents%252bin%252bbigger%252bweb%252bdynpro%252bprojects%252b(componentization)
with detail look
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/30d56578-f7e5-2a10-5ab5-8afc55d2e0e8
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for you recent grads, when I graduated they were
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Chuck

Recent Grad - needs help on what to expect for phone interview

Hi, I am a recent computer science graduate of DePaul university. I have been looking for an entry level full time position for the past three months and I finally got a nible. The problem is I have never had a phone interview and I really don't know what to expect. I really need this job so I want to prepare myself as much as possible. The position in and entry level programmer/analyst. Below is the job description, can someone please tell me wher I can find some quick reference for COBOL and C++. I took a class in both and did pretty well but that was school and this is real life. Again, I really want this position and I am a really quick study. Can someone please tell me what kinds of questions I should prepare to answer. I know the is a java forum but I was hoping one of you professional programmers can point me in the right direction. Any help would be greatly appreciated.
Role: Programmer Analyst (COOL Developer)
The Programmer Analyst is responsible for developing and managing the
application code and user interface (UI) components for a basic system
on the products and services team. (These systems can include the base TBA
System, desktop applications, IVR systems, or Internet/intranet applications.)
The Programmer Analyst works closely with other programmer analysts,
quality assurance analysts, and systems analysts, with tasks in the following
categories:
Planning and design. The Programmer Analyst takes the specifications
from the Systems Analyst and then determines the detailed tasks required to
create the code and UI.
Developing the application code and UI components. The Programmer
Analyst builds the code and UI components according to the functional
specifications and detailed design.
Other specific responsibilities in development include:
Working with the Systems Analyst to clarify and improve the design as
required. He or she may also prepare user documentation and will unit
test each piece of code to verify the basic functionality before passing it along
for more comprehensive testing. Throughout the project, the programmer analyst
consistently uses code management tools to avoid versioning problems.
Role Requirements
Problem solving and decision making
Learning agility
Client responsiveness
Project execution
Project analysis and planning
Technical Skills
Structured programming, design, and language(s) such as COBOL or C
Operating systems
Relational databases and data models (ex. DB2, Oracle or Access)
Source code management
Editing, compiling, and debugging tools
Creating user and technical documentation
Years of Relevant Experience Required: 0-4 years
Travel Required: None
COOL stands for COBOL Object-Oriented Language. It utilizes some of the
skills involved in both COBOL and C++ programming.
Again ANY HELP WOULD BE GREATLY APPRECIATED.
A

Actually, no. Just need time to get to your post. If you have not had your interview already try this.
One, bone up on your basic program structures.
Know basic keywords, etc.
Have your books in front of you and open to some topics that seem like test questions.
Review the content of the books that are pertinent. Prepare for the interview like you would a test.
ABOVE ALL - RELAX, sound confident that if you do not know the answer now you can look it up. This is an entry level position - They do not expect you to know everything - just have a basic understanding and be able to go from there.
Do not be afraid to say "I don't know but I know where to look in xxxx book".
Sorry, been busy today just got to forums.
If you posted without allowing a few hours for a reply then ....

What are the advantages..

Hi friends,
 can you please tell me what are the advantages of using MVC? because i can use ABAP Objects without using MVC.
Thanks in advance,
Regards,
Kannan.

Hi Kanna,
 For Dynamically componentised you need to use controller.In the main page you partition for what you want to present dynamically and then call controller as a response to the user.What the action you have take in case of Page flow logic(Event Handler) need to be placed in controller.
Using the MVC design pattern has the following advantages:
· Structuring BSP applications is simplified, since the view is cleanly separated from the controller and the model. This not only facilitates changing BSP applications, but also considerably improves their maintenance.
· You have the option of generating program-driven layout. The HTML/XML output is therefore created by program code instead of a page with scripting.
· Navigation using the <bsp:goto> element and call using the <bsp:call> element. The advantage of using <bsp:goto> navigation over redirect is that there is no additional network traffic. Furthermore, you remain in the same work process, which can have advantages for creating objects and memory space. The call using <bsp:call> element is more variable than adding them using INCLUDEdirective, since it is triggered at runtime.
With the call option using <bsp:call>, you can also distribute the user interface into components.
· Optimized performance due to fewer redirects.
· Intuitive and east-to-use interface for application development.
Main advantage of MVC is that you can keep these(Model View ,Controller) separately.If you need to change in logic you do not have to worry about presentation(View).
Regards,
Albert

This program rules

100000%
every time I discover a new feature in pro7 i'm like 'oh i love this so much'

"subSE7EN" <[email protected]> wrote in
message
news:e43ccq$9nk$[email protected]..
> I got this from a LiveDocs explaining the VideoDisplay
component:
> The VideoDisplay control does not support scan forward
and scan backward
> functionality. However, you can achieve this
functionality by moving the
> playback sliders...
>
> By "playback sliders", do they mean an HSlider binded to
the VideoDisplay?
Yes, the VideoDisplay component doesn't have a UI, so you'd
have to build
one of your own using the components available in Flex.
> In which case we'd have to build a full interface using
components...
Yups...
> Is there any way of using those interfaces that you can
choose from in
> Flash 8
> Pro?
I'm afraid, no.
Manish Jethani
Developer, Flex Framework
Adobe Systems Inc.

Simple caching in singleton DAO

Suppose I was to use a DAO like this in a web application. Different threads would be concurrently accessing this code from different servlets, struts actions, JSP pages, whatever.
import java.util.Map;
import java.util.HashMap;
public class CacheSingletonDAO {
     private static Map items = new HashMap();
     //----- Singleton Methods --------------------------------------------------
     private static final CacheSingletonDAO instance = new CacheSingletonDAO();
     private CacheSingletonDAO() {
          items.put("1","foo");
          items.put("2","bar");
     public static CacheSingletonDAO getInstance() {
          return instance;
     //----- Public Methods -----------------------------------------------------
     public String getItem(String key) {
          Object obj = items.get(key);
          if(obj != null && obj instanceof String) {
               return (String)obj;
          } else {
               return null;
     public Map getItems() {
          return items;
     public void addItem(String key, String item) {
          items.put(key,item);
}The code here is over simplified. For a real implementation of this, there would most likely be a private getItemsFromDB() method that the private constructor would call. I would also have a method like refreshCache() that would call the getItemsFromDB() method, so that I could call that to update the items HashMap with whatever is in the database. The addItem(String, String) method would first store the item in a database, then put item in the HashMap. Assume I would be using this in a single server, single JVM application. Are there any thread-safety or other problems/issues with code like this?

I don't think this logic necessarily follows. I agree
that the user must see all the entries in the
drop-down list, but that doesn't mean that this class
needs to hand the map over to the drop-down list
instance or the UI container. Instead, the UI could
ask this instance to write itself into the drop-down
list.I envisioned the DAO as the model in a MVC app. Writing the drop-down seems like it is a task for the view.
This is a very common sentiment among programmers.
"If you're code is written wrong, then it's not my
problem." I'm not saying that you're wrong to feel
this way, but in general projects get finished faster
when the interfaces between components or classes are
tight. That is, write an interface to your class
that helps people avoid coding mistakes. If
getItems().add() should not be coded then you should
try to make sure that it can't be.That makes sense.
This is a little better. Now when somebody else codes
getItems().add(), their code compiles (as it did
before) but when they run some test case (assuming
they test the right path) they will see an
UnsupportedOperationException instead of seeing some
occasional bad behaviour (as they would have seen
before). But better still, write an interface that
doesn't allow anybody else to code getItems().add() in
the first place. I'm not trying to make your life
more difficult, but in the long run doing this saves
time for everybody on your project.I see your point.
Would it be a reasonable
solution to write String[] getItemValues(), that
returns a copy of all the values currently in the
HashMap? Do you need to supply the user with key-value
pairs instead? Is there a way that you can return an
array of those things rather than the map?You are right, there is no reason I couldn't do that. Would this cause potential performance issues? I would think giving the client the a read-only reference to the hashmap would be faster than generating an array of Object each time.
>>
But then my original question still is do add and
refresh need to be synchronized? I can't think of
anything that would be bad if they weren't
synchronized, but maybe I am overlooking something.
What happens if someone calls the add method while
the refresh method is executing? I guess I need to
show more code to address that:
public void add(String key, String item) {
addItemToDB(key,item);
items.put(key.item);
public void refreshCache() {
items = getItemsFromDB();
}Assume addItemToDB() returns void and inserts myitem
into the database.
Assume getItemsFromDB() queries the DB for all the
items and returns a Map with all of the items.
Do these methods need to be synchronized?
You need to provide synchronization for the map, the
map has no synchronization of it's own.But just synchronizing add and refreshCache won't cut it, right? I think if things happend in this order I would have an issue:
1. Thread A calls refreshCache()
2. refreshCache() calls getItemsFromDB()
3. getItemsFromDB() internally has queried the DB, gotten a ResultSet and is building a collection from the result set, but the method isn't finished yet.
4. Thread B calls add()
5. add() calls addItemtoDB(key,item), which finishes
6. add() puts the item in the items HashMap
7. add() finished executing
8. getItemsFromDB() finishes executing and returns a collection, but the collection doesn't have the item add by Thread B's add()
9. refreshCache replaces the items HashMap with the collection returned from getItemsFromDB() and now the item that was added by Thread B's add() won't end up in the collection until next time refreshCache() is called.
This would be the case even if add() and refreshCache() were synchronized, right?

Interfaces to Components

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