example of façade design pattern?

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• JPA DAO design pattern

  Hi all
  
  I have an abstract DAO class and extend each sessionbean DAO.
  
  Here is the code example.
  
  public abstract SuperDAO {}
  
  @PersistenceContext (unitName = "stars21db")
  Private EntityManager em;
  
  public getEM() {}
  
  return Ms;
  
  }
  }
  Here's the Session Bean DAO
  @Stateless
  @Local
  public class capdaosessionbeanbean extends SuperDAO implements {CapDaoSessionBeanLocal}
  public CapDaoSessionBeanBean() {}
  }
  
  public customer getCustomer() {}
  
  EntityManager em = this.getEM ();
  
  }
  }
  
  My question is more high-design pattern is the right way to get the entity manager.
  My idea is in the DAO we dn't have to put code injection of persistence context. and simply extend SuperDAO.
  Any suggestion?
  
  With respect,
  WP

  TPO
  models do not appear in the stone and you are supposed to adapt to your situation.
  Even if it's a front and you want to reuse some pieces, feel free to do so.
  It is quite 'legal '.

  -olaf

• What is the ADF design pattern?

  If someone asks me that "what ADF design pattern based on?

  What should be the right answer?

  The complete list of the models implemented ADF is in the documentation: -.

  ADF business components Java EE Design Pattern catalog - 11g Release 1 (11.1.1.5.0)

• database design patterns

  I would like to learn more on "database design patterns ', on the internet, I can't find good web page for this.
  It should describe what data models are performed all list and describe when to use them.

  CharlesRoos wrote:
  Design patterns traditional relational database transactional table is what I'm looking for.

  There is not really such a beast - or at least no I ran into when dealing with RDBMS designs. The approach that is usually used is a "high level data model" (often called an entity-relationship diagram). This DR. would then become the plan of action for the implementation of the physical database model.

  Also such patterns exist in the database. Simpler is so-called ' header and lines plan tables "which should explain to create 2 tables and link/join with next path and it can become such performance or other problems with this model and so on.

  This isn't really a model - is standardization and what is expected of relations in 3NF.

  Also, it is wrong to assume that a "+ header - and - line-tables +" exist purely for performance problems. In fact, it can actually be slower done as 2 separate table (using 3NF) more simple using only one table (2NF).

  I remember a design methodology called Tetrach (not sure of spelling) I have done a few courses in, in the 1980s. It deals with the prediction of the performance of the relational data models. Simply put - if you have an invoice that usually consists of a single header line and 20 lines of line, processing invoices will require an average of 21 St / s (logical or physical) by Bill. 2NF, it will take a single e/s - however, the data model and then imposes a limit of 20 lines per invoice (never forget the story on such a structure coding problems).

  However, if the system is I/O forcing then? You decide on a single i/o per invoice (by limiting the flexibility of the data model) or 21 St / s per invoice (and face the real possibility that the system may be impossible to successfully treat all invoices received in time for shipment orders)?

  Well, this isn't really that relevant more with modern equipment of today and storage systems - but it still illustrates to the point that performance alone is not the primary consideration for database designs.

  When to use patter 'create 2 separate identical tables to separate the same kind of business objects, for exmple GoodTeachersTable and BadTeachersTable' and explain why and when creating this model. And so on. There are 30 such techniques of model I guess than that. University teaches only that we have "one-to-many" - thing in the world, that I'm not interested.

  I think you're confusing models of object oriented with relational data modeling design. There is no "+ patterns +" in the data model relationship - with the exception of different normal is a get - with the fundamental objective of correctly normalizing the data model to 3NF as part of a proven recipe of a robust, functional and scalable data model design.

• Why design patterns are more flexible?

  I understand that a design model is less powerful than a project template and it allows to make global changes to text captions, buttons, etc., but I do NOT understand why you cannot change the properties of the button in the design template, add new pages or add all items that do not already exist.

  What is the biggest advantage of using a model of design instead of a project template... I mean, why did I want the sentence to create one if I could simply apply a new project template instead?

  Thank you.

  Hi Rick, did you not type "Project Templates" by mistake, which means "Design Templates"? Personally, I use the word 'model' by the CP team is a bit confusing. Project templates are 'real' models, but design patterns are more play the function of a style sheet. Do you agree?

  Have a nice weekend

  Lilybiri

• Process modeling: design patterns and best practices

  Hello
  
  Could someone please suggest / share any technical information or documents tha associated with "modeling of process - Design Patterns & Best Practices."
  
  Thanks in advance
  
  Santosh K.
  
  Published by: Santosh539 on July 29, 2010 16:07

  Here is an article I wrote on the process design patterns and best practices for BPM http://www.bptrends.com/publicationfiles/05-06-WP-BPMProcessPatterns-Atwood1.pdf trends

  It is specific for Oracle BPM.

  Dan

• What design pattern - the functionality of language change

  On my request, I will have a series of buttons to choose a language. When the user selects a language, all control labels, pop-up messages and other turns in the chosen language.
  
  I would like to do from a standpoint of OOP and use design patterns. That we recommend to use?
  
  My guess is the policy template. Am I wrong?
  
  Thanks for any comment or the link.

  The policy template is used to exchange algorithms dynamically. Based on user input, that a decision can be made to perform one or more functions (game of). This behavior is encapsulated in separate objects.

  You just want to Exchange data during execution. Or maybe set some behaviours about specific functions in languages like the currencies in the way which are managed, and the other measures. The latter would be applied as a reason for the shell.

  When it is simply data need changed/loaded during execution, it instead of a change to the model in the MVC design pattern, using an observer to notify all registered "headphones" and using a command to get the thing going.

• Structure of the event by tabs design pattern

  Hi all

  Worked on a user interface using a model of design of event structure to respond to pressure on the button.

  The interface got big enough and I decided to organize buttons into groups and put them on different tabs (to the Group feature).

  However, when I put a case all about the structure of the event statement to separate the code on the pattern too I was not able to switch tabs and the interface gets stuck.

  Attached example.

  I could put all the events button of different tabs in a structure of the event, but thought that this could get very large and unreadable. Is there a standard design model that responds to this problem?

  Thank you very much.

  Select this option.

  Medwar19 wrote:

  Hi all

  Worked on a user interface using a model of design of event structure to respond to pressure on the button.

  The interface got big enough and I decided to organize buttons into groups and put them on different tabs (to the Group feature).

  However, when I put a case all about the structure of the event statement to separate the code on the pattern too I was not able to switch tabs and the interface gets stuck.

  Attached example.

  I could put all the events button of different tabs in a structure of the event, but thought that this could get very large and unreadable. Is there a model of design standard that meets this problem?

  Thank you very much.

  Select this option.

  Standard version?

  If you the tabs correspond to States so high kitted out to call a Subvi who is responcible for this State.

  

  Then inside the Subvi handling state that I use recording dynamic event to implement the events I have to the service so that in this State.

  This is what one of these sub - VI may look like.

  

  What makes very clearn that we treat in Thøis operating mode.

  Ton wrote a nugget on registration of dynamic event which can be found here.

  Ben

• What is the recommended for this kind of application design patterns

  Hi all

  I'm working on a project that should look like a Tablet PC application, shown in the attached photo.

  The larger window on the right side should change according to which key has been pressed in the left vertical bar.

  My question is, how can I implement such behavior or is it a design recommended for this model?

  My first idea was to about tabs but this means that all controls and indicators are needed in the main vi who would make my code confusing if it grows.

  Thank you for your answers

  Benjamin

  Take a look at the architecture of this plugin here.

• How to combine tables and façade design?

  Hello.

  I'm doing a flexible test program, where the user at run time can specify the number of action points that it wants to have, and the program should then adjust the front panel accordingly.

  In this case, I've added eight action points, with various elements (indicators, parameters, comment etc.).

  First of all, I want to be able to add or remove points of action (could solve this has a maximum number and by disabling those unused, or simply by making invisible unused action points).

  Secondly, I want to be able to manipulate these using table functions or similar (using the index of a control in a group of controls rather than directly accessing the command).

  

  A method I used before is the following:

  

  Here, I create an array of references to LED controls.  This way I can just reference to the desired output control and use a property node to set or read the value.  This method works, but it is very tedious to implement.

  I wonder if there is a better world, a more elegant way and less time to do this.  Anyone have any ideas? :-)

  The reason why I'm not using a table, is that all the controls are smooshed together on the front, and I don't have the freedom to place the controls I would.

  Thanks for any help!

  Here is a small example of how I could do this.  I used the Autoindexing from a loop TO do indexing table.  I can then use ungroup by name to get the items I want.  Since it seems that the LEDs are to indicate to the user what step is active, I've also updated using a local variable of the table, bundle by name and replace some subset of Array.

  

• Design patterns for the poor souls on the basis of LabVIEW

  Hello

  I try to design an application that requires the use of the structure of the event. Unfortunately, I don't have LabVIEWBase, so need to reinvent the wheel a little. The architecture, I'm trying to develop needs to support a user interface with controls 30-40, all with readand associated to write buttons.

  When one of the values in the exchange controls I want to run a piece of code (assumably a State of a state machine). I also need the code to run when you press play or mounted button.

  In addition to all this, I need the menu item 'Quit' to run code before you quit the application.

  Can anyone please help or suggest some architecture?

  Thank you, Alec

  When downloading of the Statemachine JKI also to download other tools Open G

  Now you have a vi called "Data Changed__ogtk.vi" that generates a 'true' when the input data have changed

  Controls that must be controlled at this VI mutiple instances and go to States according to the output wire.

• Design pattern using queues and notifiers and problem with sync

  Hello

  I'm rearchitecturing a 4-channel data acquisition system which includes data acquisition, indexing of data between four channels, signal processing and recording of data.

  All processes are placed in a single loop, and I have subdivided by the following in a producer and consumer two loop (or master with both loops slave), use a queue to manage orders and send the actual data through a notification list. I'm new to this, so I don't know how to go for rearhitecturing but am trying to move several loops. Instead of placing each channel in its own loop, I used only 2 to save duty all architecture. The acquired data are also indexed in the two loops (loop1, loop2):

  Main loop: data acquisition (DAQ Assistant) where Notifier sends data to consumers loops, queue for General commands

  Loop1: bed (table 2D index), addresses and records the data for channels 1 and 2

  Loop2: bed (table 2D index), addresses and records the data for channels 3 and 4

  Question 1: Is it ok to use Notifier and queue in the artchiture (best practices)? I would use two queues, but I find that the program may have a lag (although it lacks all data) and who interrupts the acquisition for the user and I don't want that. I prefer the program to retrieve data in real time and then decided to use the authors of notifications to send data to loops1 & 2. What are the caveats of this? Given that I am gaining at the rate of 1 s/s, maybe it will be enough.

  With respect to the orders queue, this is done and two commands are queued in order to activate loops1 & 2. Using multiple loops slave/consumer, how we manage several channels? the user can choose to acquire all the channels simultaneously or one at a time. I am able to activate the four channels. In this case, because loops can not run in order, how do you ensure that the item is read by the right loop?

  I'm running into a few problems:
  Question 2: synchronizing data - use 'wait on ms' synchronize all loops (main loop and loop1, loop2)
  -data doesn't seem to be very good sync - why is - this? consumer of treatment<>
  -what I'm missing?
  Question 3: processing loss data - because using filers is frozen and using queues is not, I did so that orders of the so-called 'turn on' the two loops is done using a queue. I compared it with the notifiers
  Question 4: Errors - I made loops 1 & 2 output on the notifier error error - they throw an error when the program stops so happy so I was testing for. I read some ni.forums he's talking about is enough, but what are the other types of error monitoring (error reporting)? Thank you very much for reading!

  I programmed so far and it can read all or individual channels but I want check against all cases, that's why I ask these questions to check. I know that architecture may not be the best, so any suggestions would be welcome. I try to get the synchronization of the time and I don't want any data with loss. I guess that the use of queues to send data and commands is ok?

  Thank you in advance for your help!

  
  

• Plugin GUI design patterns?

  Hi all

  I just want to ask if there is a plug in for drag and drop the elements of the user interface in JDE or Eclipse.

  coz write code for each UI element user is like a nightmare...

  Thank you...

  If you search around forums you will find that the project must be 'active' so that it can be copied in the Simulator. The constructor of GUI for Eclipse is scheduled for mid-2010.

• Design pattern - A4

  Hello
  
  I have a submodel set with my desired header and footer in my report and I call them accordingly in my template rtf and then download the rtf and the bi publisher report but I have a question - how to set landscape A4 models for my reports?
  
  Please is recommended all suggestions if there are several steps to do this.
  
  Thanks in advance!

  How to define models of landscape A4 for my reports?

  If I'm not mistaken
  the page settings is word document settings
  If the required value in rtf

• Replace the Ifs using design Pattern

  Hi guys,.
  
  I have a class that receives an error code and define an associated error message. So, to avoid the nested ifs, I'm looking for a solution using the model maibe.
  
  {if (returnCode.Equals("052"))}
  Errors.Add ("error", new ActionError ("error.msg", applicationResources.getMessage ("errors.myerror52")));
  
  {if (returnCode.Equals("055"))}
  Errors.Add ("error", new ActionError ("error.msg", applicationResources.getMessage ("errors.myerro55")));
  
  --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  
  For each new error code and your respective message, I need to add a new one if in the class...
  
  I accept some suggestions to do is better!
  
  Thank you very much!

  There are a number of approaches you could take. The validity and the relative value of some of them depend on the question whether the return code is really a string or a number formatted as a string. on the question of if you call always just errors.add (), just with different arguments, or if you need take completely different measures in some cases; on return codes how there; How often the codes will be added, changed, or deleted.

  1. a code card--> object encapsulating the args to errors.add (back)

  2. order model, which could be carried like a map of return code--> instance of a class that implements how to handle this code, or code return--> object class or class name, which then is instantiated, and the new run object. In both cases, the object that performs the processing will implement an interface that you define.

  3. a table whose index is the code back and whose value is an object, the object class or name of the class that handles this particular code.

  4. an enum with each enumeration value with either a different set of fields must be passed to errors.add () or a different implementation of a method, if you do not simply call errors.add () for each code.

  5. a switch statement on the return code, such as an int or an enum, or, if you are on Java 7, as a string.

  A little regardless of which of the above approaches you take, you must decide if you want to hard-code the code--> action, or if you want to put it in a configuration file or the database mapping.