Design patterns Tutorial

Hi friends,
can any one tell me the good Website for the following design patterns
Intercepting Filter, Model-View-Controller, Front Controller, Service Locator, Business Delegate, and Transfer Object
I am planning to take up SCWCD in jan 2005. I would like to know more about these design patterns. If any one having a pdf plz send me.
Thanks in advance
bye for now
sat

Read here ---> http://java.sun.com/blueprints/patterns/

Similar Messages

Struts using DAO Design Pattern Tutorail

Can anybody give me a link for the Struts using DAO Design Pattern tutorial
sample tutorial

http://javaboutique.internet.com/tutorials/ApacheDAOs/
Found by using google: strust dao pattern tutorial
There are more good links using that search...

Any good article on Singleton design pattern recently updated.

Hi,
Can anyone suggest me a good article on Singleton design pattern recently updated..?
Thanks in advance.

Check out the following Singleton Design Pattern Tutorial
http://www.beginner-java-tutorial.com/singleton.html

Looking for a tutorial/design-pattern for Manage User and Permissions.

Hello,
I wonder if anyone knows a good tutorial/blog with reference to security - howto Manage Users and Permissions.
In my application I have GROUPS and each group has access to different RECORDS and CASES.
Example:
Groups: Alfa, Beta, Gamma
Record: R1, R2, R3...
Case: C100, C200, C300
Group Alfa can view: R1, R2 and C300
Group Beta can view: R1, R3, C200, C100, C300,
Group Gamma can view: R3
My question is this: what should be the best way (design-pattern?) to force a policy to securing the Records/Cases?
What should every case/record implemented to verify that a user (part of a group) has the right to access the entity.
Thank You!

Sorry if this one is too basic for you but as I do not know your level of experience try:
http://www.adobe.com/devnet/dreamweaver/articles/first_dynamic_site_pt3_print.html
HTH
There are also many other tutorials on:
http://www.adobe.com/devnet/dreamweaver/application_development.html

EJB3 Design Patterns (Session Beans)

I've been learning about EJB3 and JSF as a potential technology for a new web app. As part of my learning about EJB3 and JSF, I came across this tutorial on the NetBeans site:
http://www.netbeans.org/kb/55/ejb30.html
In the tutorial there is one entity class, NewsEntity, from which a session bean is created, NewsEntityFacade and the interface NewsEntityFacadeLocal. It seems a little weird to me that the interface is called NewsEntityFacadeLocal and the implementing class called NewsEntityFacade. I would think that the interface should be called NewsEntityFacade and the implementing class NewsEntityFacadeLocal.
Question 1: Can anyone explain why the names are backwards (at least to my thinking)?
Also, I've been trying to find some best practices on EJB3 design patterns, but haven't come up with much. I did find some at https://blueprints.dev.java.net/bpcatalog/ee5/persistence/ejbfacade.html. Based on this pattern and the NetBeans tutorial, I think I've come across two different patterns, but since most of the examples are very simple, it's hard to tell.
Question 2: Are these two distinct patterns?
1. Session facade/entity (NB example)
2. Session facade which groups business logic and may reference multiple entity beans.
Question 3: If I have identified two patterns, can anyone tell me what they consider the pros/cons of either/both?
Thanks in advance!

The SRDemo available as an automatic update in JDeveloper 10.1.3.0.4 shows an application using local EJB 3.0 session beans. To access them in the web application you will need an entry in the web.xml like:
<ejb-local-ref>
    <ejb-ref-name>ejb/local/SRPublicFacade</ejb-ref-name>
    <ejb-ref-type>Session</ejb-ref-type>
    <local>oracle.srdemo.model.SRPublicFacade</local>
    <ejb-link>SRPublicFacade</ejb-link>
</ejb-local-ref>To lookup the session bean within you presentation you need to do a JNDI lookup. In my example I have:
new InitialContext().lookup("java:comp/env/ejb/local/SRPublicFacade");Doug

Can anyone take me in step by step to understand MVC design pattern

Hi Everybody,
I just killed myself trying to understand what is MVC and how to apply it to flash (AS3) the easy way but I could not, there is a lot of information on MVC on google but it is very hard I can not understand it and apply it to anykind of application or game, I had created a lot of games but using flash timeline (puzzle, multipel choice, simple physics interaction) and I understand that we must separte the design interface and the data of the application and the code into diffrent blocks, but what I understand is:
1- making a SWC for the design. (View)
2- use XML or TEXT file for the data.(Model)
3- classes for the code.(Controller)
this is MVC that I understand, but all the tutorials on the net is about creating 3 classes and calling each other in a very diffuclt code to understand, I realy need to work the proffessional way but it is very hard and far away from my understanding.
if any body have a way to let me understand it like making a template for every MVC application or game and explain to me his/her code it will be great, some of my questions are:
1- how we say about a class that it is the view part of the pattern while we have a SWC that hold the intreface graphics?
2- dose making a sepreate class to load and fetch external data sources like xml and text means I had created the model part of the pattern, and why the tutorials on the net do not say that if it is true?
3- making the logic of the application or game sepreated into class for each logic block, makes the controller part of the pattern?
I realy do not know what to ask more because I do not understand the MVC design pattern
Please note: if someone can chat with me on skype it will be great, but if you want to explain here also good but I need to understand it is making me crazy!
thanks in advance

I'm not a pro in this either, but a few things about it make sense to me.
First you don't need to have only three parts, but all the parts you have should be one of the three things (maybe). And they don't need to be a swc, XML/text, or a class.
I recommend the Clock tutorial from Colin Moock's book, Essential Actionscript.And here is someone walking you through it. http://flylib.com/books/en/4.14.1.137/1/
In that example there is a model which keeps track of time like the hours, minutes, seconds, if the clock is running.
There is a controller that lets you set the time, reset the clock, stop the clock, that kind of stuff. This isn't the buttons and stuff that allow you to do that, this is the code that takes the input from the buttons and communicates with the model.
So there would be a view of the buttons that the user would want to push to set the clock or what have you.
And there is a view presenting the time. Now there might be two (or more views). For example you might have an analog clock and a digital clock.
Work through that tutorial. It helped me.

Connecting - JavaFX + Servlets(??) + design patterns

Hello
I'm a total noob in JEE world so I'm sorry if I'm asking for sth really basic.
I would like to connect my JavaFX application with a simplest there is JEE-server. My guess is - Servlets (a good guess?). But before I start, here are some obstructions I need to face. The general goal of this whole project is to test few (around 5) JEE design patterns. It's because of my science project: "The use/usage of JEE design patterns in creating web applications". So what's the JavaFX for? My promotor asked for an application that would be handy for my College. So again what is going to be done :
- connect the JFX app with JEE server
- test the whole project with Cobertura, Checkstyle, Apache JMeter, Findbug, Cobertura, PMD/CMd and so on
- refactor the project with 5 design patterns. I think I'll try to use: DAO, Intercepting Filter, any suggestions what more?
- test again
- compair test results. Make conclusion on the thesis.
As for now I've found JFX class that could be used to communicate:
http://java.sun.com/javafx/1.2/docs/api/javafx.io.http/javafx.io.http.HttpRequest.html and other from javafx.io.http
I'm looking for the simplest way because I don't have a lot of time! :(((( So, is there a book, tool or a tutorial explaining how to quickly and simply do the stuff above?
What I have installed:
- winXP SP3 (linux and Eclipse still are crappy with JFX)
- Netbeans 6.7.1 with JavaFX and now I've installed additionally:
     - Java Web Applications
     - Sun Java System Web Server 7.0
     - EJB and EAR
Anything else I need?

Why don't using ejb for remote client?
It can be simpliest, you avoid web tier dev in the server and http on the fx side.
Any version requieried for the JEE? With the sixth one, few annotations and just concentrate on your job, very nice.

Design Pattern for low cohesion & coupling

Hi there!
I�m about to make a applictation in swing and don�t have so much experince in this API. Normally I program for the web using J2EE tech like Servlets, JSP, custom tag libs and EJB�s. Therefore my biggest challenge for the moment is to find (/ find out) a good framework for coding in swing and minimize coupling between the participants.
I have good knowledge about the MVC paradigm (in web programming) but finds it difficult to apply my knowledge in the Swing area. Do you have links or can recomend some litterature that handles my little but very frustrating problem?
In advance thank�s
Best regards
Niclas Rothman

Check out Java Design Patterns A Tutorial by James W. Cooper.
I am sure there are many other publications out there, but I am not quite sure what your frustration is related to swing.
Design patters are applicable in many aspects and are mostly language independent. In fact swing uses some of the design patters such at the command pattern in using Actions.
Hope this helps
Neelesh

Flex design patterns

Hi ,I would like to convert a existing struts application to
flex ,the current application has different modules,ie different
screens when converting to flex should the UI just be one mxml or
how should the segragation of module based UI's be done.
Are there any resources available for design patterns for
Flex 3.

I think you should look at this '
http://www.davidtucker.net/category/cairngorm/'
an excellent tutorial for 'Cairngorm' framework

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

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.

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