Accidentally removed Design Pattern

I created a new paltform independent UML project in SJSE8. Made a class diagram and did a drag and drop of the Factory Method from the GOF:Creational. I started modifying it and saw that it was modifying the pattern in the design center. Well I then deleted the objects from the class diagram. That removed the pattern from the design center. Any ideas on how to recover the pattern? I tried an update but that did not work.
Thanks for any help.

Can u try running the ide with a different user directory and see if the pattern comes back?
http://blogs.sun.com/roller/page/karthikr?entry=jse_directories

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[disc]Design pattern - immutable objects.

I`m working more often with immutable object because it doesn`t cost as much work to keep object consistent. But sometimes an object has to be build or a reference to his child objects has to be set.
eg
class A{
    private ArrayList bList = new ArrayList();
    public A(){}
    public void addB(B b){
        bList.add(b);
class B{
    private A a;
    public B(A a){
         this.a = a;
}It`s now more complicated to make a immutable version of A.
My question is how this problem could be solved. One solution is to add an immutable flag that could be set to true if the last B is added. But this couldn`t be checked compile time.
Maybe there is a design pattern for this problem.
I would like to discuss about this problem, so every thought is welcome.

I have an Immutable Collection wrapper class that I use when I want to have a Collection be read-only.
If you look at the JavaDoc for AbstractCollection you'll see that the add and remove methods throw UnsuportedOperationException.
So all you have to do is implement the iterator() and size() methods. i.e.
public class ImmutableCollection extends AbstractCollection {
     private Collection collection;
      * only constructor
     public ImmutableCollection(Collection collection) {
          this.collection = collection;
      * returns the size of the collection
     public int size() {
          return collection.size();
      * returns a non-modifiable iterator over the elements of the collection
     public Iterator iterator() {
          return new Iterator() {
               Iterator iterator = collection.iterator();
               public boolean hasNext() {
                    return iterator.hasNext();
               public Object next() {
                    return iterator.next();
               public void remove() {
                    throw new UnsupportedOperationException();
}

Is there a design pattern for splitting up files into smaller files?

I am developing a project where I have to load very large files (upto 50 MB). Currently I am loading these files completely into (consecutive) memory. This has the advantage that I can very easily change bytes at certain locations, because I do not know the
structure of all bytes.
However, my intention is to also change the structure, e.g. removing/adding 'chunks'. Now I have the idea to remove the 'known' parts out of it, store them in classes with a data chunk only containing those parts and make a sort of reference list to those chunks.
E.g.:
Original file:
Header
ChunkA 1
ChunkA 2
Intermediate
ChunkB 1
Footer
The result will be:
ChunkA 1 and ChunkA 2 instance. ChunkB 1 instance
'File' instance and a reference with base offsets + reference to all chunks.
At the end I have to 'recreate' or write the original file (with changes) back.
Is this in general a good idea or is there some design pattern helping me in this?

50MB is not much in the modern era of 6GB+ machines. If you want to optimize memory then consider using a
memory mapped file.
But you mentioned making data structure changes. This is generally dangerous as you have to be concerned about things like disaster recovery. What happens if you are in the middle of saving the modified structure when the program dies? You just corrupted
your file. A better solution is to stream the existing file using BinaryReader to read in the existing file in parts based upon the structure. Write out the data to a new, temporary file using BinaryWriter. This may be the original data or your modifications
depending upon need. Once you've generated the new file replace the old file (with optional backup). So even if something catastrophic happens during saving you don't lose the original file.
Michael Taylor
http://blogs.msmvps.com/p3net

How can I develop a web application using EJB design pattern?

I have searched over the web and found quite a lot of tutorials on how to use the EJB design pattern.
I know that there will be a home interface, EJB object interface and a SessionBean.
But the tutorials often only cover a single class, this made me unable to get a complete picture of how EJB design pattern can be implemented into a whole system.
I am now required to devleop an online shopping web application using EJB and JSP page.
I think I will need to create a lot of classes: Member, ShoppingCart, Product...etc.
What I want to ask is that, do I need to create a home interface, EJB object interface and a SessionBean for each of these classes?
I really need some ideas on how to develop this system using EJB + JSP pages.
Many thanks to you all.

For every EJB that you want to create, you will need to code a home and remote interface and a bean class.
You could start getting your ideas here
http://www.theserverside.com/books/wiley/masteringEJB/
http://www.coreservlets.com

Hello! I was on my Mac and then I clicked on iTunes. Then I clicked on iTunes, and accidentally removed my device from my Mac, how can I get it back? Also when I plug my iPod into the computer, it downloads everything, how can I stop this. please help!thx

Hello! I was on my Mac and then I clicked on iTunes. Then I clicked on Account, and accidentally removed my device from my Mac, how can I get it back? Also when I plug my iPod into the computer, it downloads everything that is on my computer, how can I stop this. please help! please help!!!!!!thank you

Is the iPod still singed into the account isn Settings>iTunes and App Stores and SettingsZ>iCloudl? If it is then I would not be concerned.
Also see:
iTunes Store: Associating a device or computer to your Apple ID
since you may have started the 90 day window.
For the other "problem", go to iTunes>Preferences>Devices and check the box that says Prevent iPod....automatically syncing.

SERVICE LOCATOR ?? Is it really an interesting Design pattern??

Hi everybody,
i've a problem with the J2EE Design Pattern "Services locator" (it's a singleton).
It is said that by making use of a Service Locator we can :
- hide to the client the complexities of initial context creation, EJB home object lookup,and EJB objectre-creation.
- multiple clients can reuse the Service Locator object to reduce code complexity, provide a single point of control, and improve performance by providing a caching facility.
But i would like to understand at which side should that service locator object reside??!!??
If it is at server side then the clients need well an initial context in order to make a lookup on that object.
Conclusion :
the service locator doesn't hide the complexities of initial context!!
Furthermore the client has to perform a look-up on that service locator object!! The only advantage left is caching facility.
If it is at client side, each client needs his own services locator object
Conclusion :
multiple client don't reuse the same service locator. What's the advantage to be a singleton ???
There is certainly something that i don't understand so help me please!! Thanks.

Hi Yves,
But i would like to understand at which side should
that service locator object reside??!!??
If it is at client side, each client needs his own
services locator object
Conclusion :
multiple client don't reuse the same service locator.
What's the advantage to be a singleton ???The service locator resides on the client side and is implemented as
a singleton. Since it is possible that there could be multiple
class loaders/JVMs on the client side, and therefore, multiple
instances of the "singleton" service locator. This is typical
in a distributed environment (e.g. servlets/JSPs in a web-tier
cluster using service locator). Thus service locator is not
a truly "distributed singleton" object. But, the empahsis
is to design the service locator such that it does not hold
any state that needs to be replicated across multiple
instances across different JVMs as mentioned. Thus, there
is no need for multiple clients to use the "same" service locator,
but still the benefits of implementing this pattern is realized.
By making it a singleton, and keeping it from holding state
that needs to be replicated, we realize the benefits of this pattern.
You may also want to visit the J2EE Pattern interest list
and see these relevant discussions :
Topic: Service Locator and passivation
http://archives.java.sun.com/cgi-bin/wa?A2=ind0106&L=j2eepatterns-interest&F=&S=&P=1026
Topic: Caching EJBHome interfaces
http://archives.java.sun.com/cgi-bin/wa?A2=ind0106&L=j2eepatterns-interest&F=&S=&P=9226
Topic: Using Service Locator for Data Source caching
http://archives.java.sun.com/cgi-bin/wa?A1=ind0106&L=j2eepatterns-interest#31
hope this helps,
thanks,
-deepak

What is the best design pattern for this problem?

No code to go with the question. I am trying to settle on the best design pattern for the problem before I code. I want to use an Object Oriented approach.
I have included a basic UML diagram of what I was thinking so far.
Stated simply, I have three devices; Module, Wired Modem, and Wireless Modem.
In the Device Under Test parent class, I have put the attributes that are variable from device to device, but common to all of them.
In the child classes, I have put the attributes that are not variable to each copy of that device. The attributes are common across device types. I was planning to use controls in the class definition that have the data set to a default value, since it doesn't change for each serial number of that device. For example, a Module will always have a Device Type ID of 1. These values are used to query the database.
An example query would be [DHR].[GetDeviceActiveVersions] '39288', 1, '4/26/2012 12:18:52 PM'
The '1' is the device type ID, the 39288 is the serial number, and the return would be "A000" or "S002", for example.
So, I would be pulling the Serial Number and Device Type ID from the Device Under Test parent and child, and passing them to the Database using a SQL string stored in the control of the Active Versions child class of Database.
The overall idea is that the same data is used to send multiple queries to the database and receiving back various data that I then evaluate for pass of fail, and for date order.
What I can't settle on is the approach. Should it be a Strategy pattern, A Chain of Command pattern, a Decorator pattern or something else.
Ideas?

elrathia wrote:
Hi Ben,
I haven't much idea of how override works and when you would use it and why. I'm the newest of the new here.
Good. At least you will not be smaking with a OPPer dOOPer hammer if I make some gramatical mistake.
You may want to look at this thread in the BreakPoint where i trie to help Cory get a handle on Dynamic Dispatching with an example of two classes that inherit from a common parent and invoke Over-ride VIs to do the same thing but with wildly varying results.
The example uses a Class of "Numeric" and a sibling class "Text" and the both implement an Add method.
It is dirt simple and Cory did a decent job of explaining it.
It just be the motivation you are looking for.
have fun!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Business delegate and Session facade design patterns

Does any one tell me, what is the difference between business delegate and session facade design patterns.

1. Session Facade decouples client code from Entity beans introducing session bean as a middle layer while Business Delegate decouples client code from EJB layer ( Session beans).
2. SF reduces network overhead while BD reduces maintenance overhead.
3. In SF any change in Session bean would make client code change.
While in DB client is totally separate from Session bean because BD layer insulate client from Session beans(EJB layer).
3. In only SF scenario, Client coder has to know about EJB programming but BD pattern no EJB specialization needed.
4.SF emphasizes on separation of Verb, Noun scenario while BD emphasizes on separation of client(presentable) and EJB layer.
Anybody pls suggest more differences ?

Does any body have any design patterns of JSF Web Application Developping?

Can any one answer me some questions?
#1.I am an amatuar of people who develop Web Application.For some reason,We choose the JSF to develop our item.through some introduction,I know the UI component of JSF is resided in Server side,is it right?but I am a little confused that:if there are many users who are exploring our jsf website.(to simplify my question,image I had just one web page and just one button)How many UI components(buttons) will be there?How it(they?) works?
#2.Does any body have the success experience (for example design pattern)to develop web applications?if We just concern about the Add,Delete,Modify,Query operations of some data.
I just do my job according to my feeling.
I will give every page a pagebean(backing bean),and I am not sure how to combine the business data with the pagebean.some one suggested that I should use delegate pattern to separate my business log and page logic.But I am still confused by following things:
#2.1 does JSF have the same ability to help us construct the model dialog just like swing to
help us control the operation flow?
#2.2 If there is not,Does the following way work?I put every tabledata's property as corresponed component.if user choosed the row in the table,My Listener will syncronize the row data to the components.But
#2.2.1 if JSF has the components according to the web users' number,how can My Listener tell which component should be update?Should I maintain the map?
#2.2.2 If the problem I imaged above is false,Does any body can tell me how to custom the ListDataModel,so I can use it like Swing?because now I can just use some view data to insert into ListDataModel,but after some selection operation,my business object must be find according to the selected data,it is not an interesting job!
I am waiting for your advice!

Ok I'll try to explain Step by step please correct me if I make any mistake because I have not played much with shared variables.
To create a shared variable to an RT target go to the target if tou have already otherwise add an RT target by right clicking the Project>>Add targets and Devices
Then in the target Right clikc and select the variable as shown below.
Then once the Shared variable settings window opens Enter a variable name and then Select the type "Network Published"
In the right side you can select the data type for the shared variable and even you can choose your custome controls.
After selecting the data type go for the Network and select buffering if required else leave it if you are planning to use the variable just for display purpose.
Then you can enable the RT FIFO if required (Not able to explain how it works and why it is used).
Then after completing the Shared variable setup you can access the variable in the VI in both the Host and the RT.
You can bind the variable to a control so that if any data from the RT is coming you can read the data from that control.
Once you have placed your shared variable in the BD you can change the access typr to read or write depending on your need.
This might not explain the complete shared variable concept but I believe that this would defenelty give you a kick off to start using the shared variable. Please correct or add more comments if anybody know better.
Good luck.
The best solution is the one you find it by yourself

Design patterns for updating a fact table

I have a fact table and about 10 dimensions.
One of these dimensions can be missing values, so the fact table row will link to an UNKNOWN value.
When the correct value is finally entered in the dimension table i want to update any associated fact rows.
Whats the most efficient way of doing this?

I know i have to use a lookup transformation ;-)
I wouldnt be at teh stage of even having a fact table if i didnt know that! I was looking for a design pattern, not the name of a shape!
The solution i went with was to take a hard line on any rows with unknown values. If when importing the data there are unknown values for two of the most important dimensions, those rows are not inserted into the fact table, but instead pushed to an ErrorLog
table.
Users run a report that shows what this table contains and if they really want those rows, they insert the correct dimension values and rerun the import, which will only import any rows not already in the fact table.
This way:
1. all sorting & filtering issues are resolved as there will be no unknown rows for the most important dimensions used in sorting and filtering.
2. we can quickly see any rows with unknown values and figure out whats wrong. its always missing reference data that the client didnt think to give us. a quick insert of the dimension data and import and the rows get imported.
thanks for the replies.

I accidentally remove Quicktime

i accidentally remove Quicktime and now my itunes wont open.
i have just enter a hugh list to my library and i did not make a backup yet. is there a way too keep itunes library. i try to reinstall quicktime again but with no succes. it took me days to make that library and are in no mood to do it agian. so your help is most welcome
Ipod (30gb) Windows XP Pro

Remove iTunes and reinstall.
Your iTunes music is not going anywhere.
Completely Remove iTunes and QuickTime
"Note: Songs you purchased from the iTunes Store or imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes.
1 - Quit iTunes.
2 - On the Start menu, click Control Panel.
3 - In Control Panel, open Add or Remove Programs.
4 - Select iTunes from the list of currently installed programs, then click Remove.
5 - When asked if you would like to remove iTunes, select Yes.
6 - After the uninstallation is complete, do not restart if you are prompted to.
7 - If other entries were present for iTunes remove those as well.
8 - In Add or Remove Programs, remove any iPod Updater applications that are listed in the same fashion as iTunes was removed.
9 - In Add or Remove Programs, remove any QuickTime installations that are listed in the same fashion as iTunes was removed.
10 - Restart your computer.
11 - After the computer restarts, open Local Disk C: in My Computer or whichever disk programs are installed on.
12 - Open the Program Files folder.
13 - Right-click the iTunes folder and select Delete and choose Yes when asked to confirm the deletion. Note: This folder may have already been deleted if iTunes was successfully removed in steps 1-8.
14 - Right click the iPod folder and select Delete and choose Yes when asked to confirm the deletion.
15 - Right-click the QuickTime folder and select Delete and choose Yes when asked to confirm the deletion.
16 - Delete the QuickTime and QuicktimeVR files located in the C:\Windows\system32\ folder.
17 - Right-click on the Recycle Bin and on the shortcut menu, click Empty Recycle Bin.
18 - Restart your computer.
19 - Install the latest version of iTunes from http://www.apple.com/itunes/download."

I accidentally removed iphoto from dock, please help?

I accidentally removed iphoto from dock, please help?
iPhoto isn't in my applications to I can't drag it to dock. All images and movies are still on Mac (heart did stop as I thought I'd lost everything and nearly cried) but I don't know how to get iPhoto back. I'm worried about trying different things as don't want to lose anything on Mac. Noticed that I haven't been using Time Machine and bought a couple of years ago so not sure what operating with. I have our 2 CDs from when we bought the Mac - 13-inch Macbook Pro (Mac OS X Install DVD) and 13 inch MacBook Pro (Applications Install DVD). My photos are not backed up so not sure if I need to do this first - can I back up to iCLoud or do I need newer software?
Any help would be greatly appreciated - need lots of step by step instructions though!

All images and movies are still on Mac
Of course they are. Deleting an app doesn't delete the files that's in it.

Design Patterns/Best Practices etc...

fellow WLI gurus,
I am looking for design patterns/best practices especially in EAI / WLI.
Books ? Links ?
With patterns/best practices I mean f.i.
* When to use asynchronous/synchronous application view calls
* where to do validation (if your connecting 2 EIS, both EIS, only in WLI,
* what if an EIS is unavailable? How to handle this in your workflow?
* performance issues
Anyone want to share his/her thoughts on this ?
Kris

          Hi.
          I recently bought WROX Press book Professional J2EE EAI, which discusses Enterprise
          Integration. Maybe not on a Design Pattern-level (if there is one), but it gave
          me a good overview and helped me make some desig decisions. I´m not sure if its
          technical enough for those used to such decisions, but it proved useful to me.
          http://www.wrox.com/ACON11.asp?WROXEMPTOKEN=87620ZUwNF3Eaw3YLdhXRpuVzK&ISBN=186100544X
          HTH
          Oskar

Process Design Patterns in XI

Hello,
I heard that XI has got Design patterns such as Aggregation, Serialization etc. in the Process editor. Where do the messages get stored until the aggregation is carried? Does it make use any ODS in Integration server?
We are using TIBCO and it does not seem to have this functionality.
Thanks,
Venu

Hi Venu,
The XI Business Process Engine is implemented on top of SAPs workflow engine, so the state of a process (including whatever messages it contains) is stored in the database underlying the SAP Web Application Server.
Regards,
Thorsten

Producer/Consumer Design Pattern with Classes

I'm starting a new project which involves acquiring data from various pieces of equipment using a GPIB port. I thought this would be a good time to start using Classes. I created a GPIB class which contains member data of: Address, Open State, Error; with member vis such as Set Address, Get Address, Open, Close...general actions that all GPIB devices need to do. I then created a child class for a specific instrument (Agilent N1912 Power Meter for this example) which inherits from the GPIB class but also adds member data such as Channel A power and Channel B power and the associated Member Functions to obtain the data from the hardware. This went fine and I created a Test vi for verfication utilizing a typical Event Structure architecture.
However, in other applications (without classes) I typically use the Producer/Consumer Design Pattern with Event Structure so that the main loop is not delayed by any hardware interaction. My queue data is a cluster of an "action" enum and a variant to pass data. Is it OK to use this pattern with classes? I created a vi and it works fine and attached is a png (of 1 case) of it.
Are there any problems doing it this way?
Jason

JTerosky wrote:
I'm starting a new project which involves acquiring data from various pieces of equipment using a GPIB port. I thought this would be a good time to start using Classes. I created a GPIB class which contains member data of: Address, Open State, Error; with member vis such as Set Address, Get Address, Open, Close...general actions that all GPIB devices need to do. I then created a child class for a specific instrument (Agilent N1912 Power Meter for this example) which inherits from the GPIB class but also adds member data such as Channel A power and Channel B power and the associated Member Functions to obtain the data from the hardware. This went fine and I created a Test vi for verfication utilizing a typical Event Structure architecture.
However, in other applications (without classes) I typically use the Producer/Consumer Design Pattern with Event Structure so that the main loop is not delayed by any hardware interaction. My queue data is a cluster of an "action" enum and a variant to pass data. Is it OK to use this pattern with classes? I created a vi and it works fine and attached is a png (of 1 case) of it.
Are there any problems doing it this way?
Including the error cluster as part of the private data is something I have never seen done and ... well I'll have to think about that one.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Accidentally removed Design Pattern

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