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• How to build MVC Views that work with polymorphic domain model design?

  - by Johann de Swardt

  This is more of a "how would you do it" type of question. The application I'm working on is an ASP.NET MVC4 app using Razor syntax. I've got a nice domain model which has a few polymorphic classes, awesome to work with in the code, but I have a few questions regarding the MVC front-end. Views are easy to build for normal classes, but when it comes to the polymorphic ones I'm stuck on deciding how to implement them. The one (ugly) option is to build a page which handles the base type (eg. IContract) and has a bunch of if statements to check if we passed in a IServiceContract or ISupplyContract instance. Not pretty and very nasty to maintain. The other option is to build a view for each of these IContract child classes, breaking DRY principles completely. Don't like doing this for obvious reasons. Another option (also not great) is to split the view into chunks with partials and build partial views for each of the child types that are loaded into the main view for the base type, then deciding to show or hide the partial in a single if statement in the partial. Also messy. I've also been thinking about building a master page with sections for the fields that only occur in subclasses and to build views for each subclass referencing the master page. This looks like the least problematic solution? It will allow for fairly simple maintenance and it doesn't involve code duplication. What are your thoughts? Am I missing something obvious that will make our lives easier? Suggestions?

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• Loading the Cache from the Business Application Server

  - by ACShorten

  By default, the Web Application server will directly connect to the Database to load its cache at startup time. Customers, who implement the product installation in distributed mode, where the Web Application Server and Business Application Server are deployed separately, may wish to prevent the Web Application Server to connect to the database directly. Installation of the product in distributed mode was introduced in Oracle Utilities Application Framework V2.2. In the Advanced Web Application Server configuration, it is possible to set the Create Simple Web Application Context (WEBAPPCONTEXT) to true to force the Web Application Server to load its cache via the Business Application rather than direct loading. The value of false will retain the default behavior of allowing the Web Application Server to connect directly to the database at startup time to load the cache. The value of true will load the cache data via direct calls to the Business Application Server, which can cause a slight delay in the startup process to cater for the architecture load rather than the direct load. The impact of the settings is illustrated in the figure below:                             When setting this value to true, the following properties files should be manually removed prior to executing the product: $SPLEBASE/etc/conf/root/WEB-INF/classes/hibernate.properties $SPLEBASE/splapp/applications/root/WEB-INF/classes/hibernate.properties Note: For customers who are using a local installation, where the Web Application Server and Business Application Server are combined in the deployed server, it is recommended to set this parameter to false, the default, unless otherwise required. This facility is available for Oracle Utilities Application Framework V4.1 in Group Fix 3 (via Patch 11900153) and Patch 13538242 available from My Oracle Support.

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• "Progressive" JPEG: Why do many web sites avoid rendering JPEGs that way? Pros, cons?

  - by Chris W. Rea

  When JPEG images are used by a web page, they are typically rendered top-down ... but they can also be rendered using a mode called progressive JPEG, where the image starts out full-size, but blurry, and then gets sharper with successive passes, until it's fully loaded. Progressive loading requires the image have been saved that way. Why don't more web sites use progressive JPEG? What are the drawbacks? Is it simply a lack of tool support, or are these files somehow inferior to traditional top-down rendered JPEG images?

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• Should "closed as duplicate" software programming be extreme or functional? [migrated]

  - by Web Developer

  I'm a web developer loving this site for it's potential, and it's Coffee look . I was reading a great question, that is this: click here and noticed 8 moderators tagged it as DUPLICATED! The question was closed! Obviously it isn't and I'm going to explain why if needed but it can be seen: the question is unique, is the case/story of a young who have SPECIFIC experience with C++ , VB and Assembler and asking, knowing this specifications an answer (It is not a general question like "hey I'm young can I do the programmer??") Let me know your opinion! do you think this question should or should not be closed? And let's think about also the people not only the "data" and "cases covered" ... do you think this is important too? or is better to keep a place where people doesn't count?

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• Sending email notifications to users

  - by Web Girl

  What is the preferable way to send email notifications to users? I can do it both ways but what is better? have some c# code that calls stored procedure in the database. Stored procedure based on some logic pulls all the emails data and sends email using database mail or c# code calls stored procedure, gets all the nesessary data back and sends email itself using smtp server etc. I just wonder what is the preferable way in the sense of performance etc... C# code is a library that would be a part of the web application. So it's where it's better to put the load, on the application server or the database server? System will not be crazy busy, it's not like Amazon or something. But still it would be nice to create something that makes sense.

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• Where would my different development rhythm be suitable for the work?

  - by DarenW

  Over the years I have worked on many projects, with some successful and a great benefit to the company, and some total failures with me getting fired or otherwise leaving. What is the difference? Naturally I prefer the former and wish to avoid the latter, so I'm pondering this issue. The key seems to be that my personal approach differs from the norm. I write code first, letting it be all spaghetti and chaos, using whatever tools "fit my hand" that I'm fluent in. I try to organize it, then give up and start over with a better design. I go through cycles, from thinking-design to coding-testing. This may seem to be the same as any other development process, Agile or whatever, cycling between design and coding, but there does seem to be a subtle difference: The methods (ideally) followed by most teams goes design, code; design, code; ... while I'm going code, design; code, design; (if that makes any sense.) Music analogy: some types of music have a strong downbeat while others have prominent syncopation. In practice, I just can't think in terms of UML, specifications and so on, but grok things only by attempting to code and debug and refactor ad-hoc. I need the grounding provided by coding in order to think constructively, then to offer any opinions, advice or solutions to the team and get real work done. In positions where I can initially hack up cowboy code without constraints of tool or language choices, I easily gain a "feel" for the data, requirements etc and eventually do good work. In formalized positions where paperwork and pure "design" comes first and only later any coding (even for small proof-of-concept projects), I am lost at sea and drown. Therefore, I'd like to know how to either 1) change my rhythm to match the more formalized methodology-oriented team ways of doing things, or 2) find positions at organizations where my sense of development rhythm is perfect for the work. It's probably unrealistic for a person to change their fundamental approach to things. So option 2) is preferred. So where I can I find such positions? How common is my approach and where is it seen as viable but different, and not dismissed as undisciplined or cowboy coder ways?

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• Is it wise to ask about design decisions made on a product during an interview?

  - by Desolate Planet

  I've been thinking about interview questions lately and I've been reflecting on bad interview experiences I've had in the past. One of particular note is where I had asked the interviewer why the team chose to use Spring over EJB3 in their product. The interviewer pretty much tore my face off, yelling "Because Spring is not the be all and end all of Java software development, do you want this job or not?". In response to this, I told him that this probably wasn't the job for me and I walked out the interview. He told me at the start of the interview that they had high stuff turnover, the product had gone from Modula 3 to Perl to Java then after asking him a technical question, he went in flames. It seemed obvious to me that he was toxic to the company with that kind of attitude. Question: Is it a good idea to probe on architectural choices taken in an interview? If not, why? From my own point of view, an interview is a two-way process. If the interviewers are testing me on my technical skills, I've got every right to ask them the same questions to 1) Figure out what their mindset and attitudes towards developing software solutions are and 2) To figure out if there are in line with how I would approach problems of that kind. It's very possible that the interviewer who got angry was a bad interviewer and forgot that an interview is a two-way process. If I was asked this, I would have simply said something along the lines of wanting to leverage the container more, but I certainly wouldn't have tried to put him in a state of meek capitulation. The interviewer in question was the lead developer in the team.

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• Who are the outspoken critics of Object-Oriented design?

  - by Xepoch

  Sure, object-oriented techniques are great and have stuck around for a while. I know only less than a handful of critics of the OO principles. It seems as though most non-OO designs and architectures are shunned, yet we continue to write a lot of good software in C and solve a lot of data changes via awk/sed and countless other examples. Correct tool for the correct job, yes? I'm having a hard time finding articles, presentations, or published criticisms of OO (even Fred Brooks has blessed information hiding). Are there any well-known, published and/or outspoken critics of OO?

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• change directory automatically on ssh login

  - by Gareth

  Hi, I'm trying to get ssh to automatically change to a particular directory when I log in. I tried to get that behaviour working using the following directives in ~/.ssh/config: Host example.net LocalCommand "cd web" but whenever I log in, I see the following: /bin/bash: cd web: No such file or directory although though there is definitely a web folder in my home directory. Even using an absolute path gives the same message. To be clear, if I type cd web after logging in I get to the right folder. What am I missing here? EDIT: Different combinations of quotes/absolute paths give different error messages: LocalCommand "cd web" /bin/bash: cd web: No such file or directory LocalCommand cd web /bin/bash: line 0: cd: web: No such file or directory LocalCommand cd /home/gareth/web /bin/bash: line 0: cd: /home/gareth/web: Input/output error This makes me think that the quotes shouldn't be there, and that there's another error happening.

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• Weird unexpected image compression on a web server running Apache on Ubuntu?

  - by Billy Bob Thornton

  I have a weird problem on my production web server running Apache on Ubuntu: it compresses my images thereby dramatically lowering their quality! Actually I have two virtual hosts running, each located in a different folder. Wether I display .gif images by navigating on the two sites, or acceding them directly by their url, their size and quality are invariably degraded. I tried with three different browsers: same problem. Using them on other sites on the Web: no problem. Of course I disabled mod_deflate on the server (which should not compress images anyway), but the phenomenon remains. On my local développement server, running the same configuration, everything is Ok. Now I'm completely lost! For the record, my configuration: Ubuntu 10.04, Apache 2, Php 5.

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• Breakout clone, how to handle/design for collision detection/physics between objects?

  - by Zolomon

  I'm working on a breakout clone, and I wish to create some realistic physics effects for collision - angles on the paddle should allow the ball to bounce, as well as doing curve balls etc. I could use per-pixel based collision detection, but then I thought it might be easier with line/circle intersection testing. So, then I naturally consider making a polygon class for the line-based objects and use the built-in circle class for the circular objects. That sounds like an OK approach, right? And then just check for collision using the specified algorithm based on the objects that might be within each other's range?

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• SPD 2013 Missing design view, is it really such a big deal?

  - by Sahil Malik

  SharePoint 2010 Training: more information First, please read what my friend Marc Anderson has to say about it. More, and More and even more. Also, my friend Asif Rehmani has some views on it as well. They bring up some important points, but in short, everything that allows for Visual Editing of pages, is gone! And anything that concerned visual editing, (and there are many such scenarios), is now gone. What is the practical upshot of all this? Read full article ....

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• Are there well-known examples of web products that were killed by slow service?

  - by Jeremy Wadhams

  It's a basic tenet of UX design that users prefer fast pages. http://www.useit.com/alertbox/response-times.html http://www.nytimes.com/2012/03/01/technology/impatient-web-users-flee-slow-loading-sites.html?pagewanted=all It's supposedly even baked into Google's ranking algorithm now: fast sites rank higher, all else being equal. But are there well known examples of web services where the popular narrative is "it was great, but it was so slow people took their money elsewhere"? I can pretty easily think of example problems with scale (Twitter's fail whale) or reliability (Netflix and Pinterest outages caused by a single datacenter in a storm). But can (lack of) speed really kill?

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• Build a Front End of an E-commerce System Using ASP.NET MVC Framework Part 2

  In this two-part series, you will learn how to a typical front end of an E-commerce system using the great Microsoft ASP.NET MVC 1.0 framework. In the first part, we will focus upon the following points: system design, functionality design, architecture design, and database design, etc. in the second part, we will discuss the detailed coding related things.

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• Should I get my masters in Game Design and Development or Computer Science?

  - by Christopher Stephenson

  I am a recent grad with a B.S. in IT while I didn't minor in Game Desgin and development, I took few classes in it. During my job search I have seen that most gaming companies seems to want someone that majored in C.S, mathematics, or physics. During my undergrad I never had to take physics nor did I learn much about data structures and algorithms. These seem to be really important when searching for a job in game development. So I am thinking about going back to school to get my masters in either CS, or GDD. The problem though is which one? I am really not looking to create my own games, I just want to work on games.

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• Build a Front End of an E-commerce System Using ASP.NET MVC Framework Part 1

  In this two-part series, you will learn how to a typical front end of an E-commerce system using the great Microsoft ASP.NET MVC 1.0 framework. In the first part, we will focus upon the following points: system design, functionality design, architecture design, and database design, etc. in the second part, we will discuss the detailed coding related things.

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• Using default parameters for 404 error (PHP with mvc design)?

  - by user1175327

  I have a custom made Framework (written in PHP). It all works very good, but i have some doubts about a certain thing. Right now when a user call this url for example: http://host.com/user/edit/12 Which would resolve to: user = userController edit = editAction() in userController 12 = treated as a param But suppose the controller 'userController' doesn't exist. Then i could throw a 404. But on the other hand, the url could also be used as params for the indexController (which is the default controller). So in that case: controller = indexController user = could be an action in indexController, otherwise treated as a param edit = treated as a param 12 = treated as a param That is actually how it works right now in my framework. So basically, i never throw a 404. I could ofcourse say that only params can be given if the controller name is explicitly named in the URL. So if i want the above url: http://host.com/user/edit/12 To be invoked by the indexController, in the indexAction. Then i specifically have to tell what controller and action it uses in the URL. So the URL should become: http://host.com/index/index/user/edit/12 index = indexController index (2nd one) = the action method user = treated as a param edit = treated as a param 12 = treated as a param That way, when a controller doesn't exist, i don't reroute everything as a param to the index controller and simply throw a 404 error. Now my question is, which one is more preffered? Should i allow both options to be configurable in a config file? Or should i always use one of them. Simply because that's the only and best way to do it?

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• Can you run a specific tomcat Web Application under another user?

  - by Boaz

  Hi, We're developing a web-app running under tomcat which relies on Java User preferences to store all kind of settings. That works great, but we've run into problem where we needed to set up another staging web-app which allows you to test settings before settings them live. The core of the problem lies in the fact that Java User preferences are the same for all web-app due to the fact that all of them run under the tomcat user (configurable). For legacy reasons I can not at the moment change my preferences structure, so I'm hoping for a solution on the the tomcat configuration side. Is it possible to designate a different user credentials for a specific web-app in tomcat? Thanks, Boaz

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• Blogger : refonte en profondeur de la plateforme de blogs de Google, la nouvelle interface sera développée avec Google Web Toolkit

  Google annonce une refonte en profondeur de la plateforme Blogger Sa nouvelle interface sera développée avec Google Web Toolkit Blogger, le célèbre service de publication Web racheté par Google en 2003, est sur le point d'avoir une refonte complète d'après son chef de produit Chang Kim. Il s'agit du changement d'interface le plus important de l'histoire du sixième plus grand site au monde qui s'enorgueillit de ses 400 millions de lecteurs et de ses 500 milliards de mots publiés, répartis sur un demi-milliard de billets de blog depuis la création du service. La nouvelle génération d'interface utilisateur de l'éditeur de billet et du tableau de bord (dashboard) de l'o...

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• Mass bulk add domains to web hosting service (possible?)

  - by Scott

  I was wondering if anyone does bulk adding of domains to your web hosting provider (Amazon, Linode, Rackspace, etc). I am thinking of creating a product that allows user to host their site on top of my web hosting and want something that can allow me to bulk add domains (and point DNS to my web hosting DNS) with as little manual work as possible. I am thinking of getting a VPS to do this. Is this possible even? Thanks Scott

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• Let a model instance choose appropriate view class using category. Is it good design?

  - by Denis Mikhaylov

  Assume I have abstract base model class called MoneySource. And two realizations BankCard and CellularAccount. In MoneysSourceListViewController I want to display a list of them, but with ListItemView different for each MoneySource subclass. What if I define a category on MoneySource @interface MoneySource (ListItemView) - (Class)listItemViewClass; @end And then override it for each concrete sublcass of MoneySource, returning suitable view class. @implementation CellularAccount (ListItemView) - (Class)listItemViewClass { return [BankCardListView class]; } @end @implementation BankCard (ListItemView) - (Class)listItemViewClass { return [CellularAccountListView class]; } @end so I can ask model object about its view, not violating MVC principles, and avoiding class introspection or if constructions. Thank you!

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• Obtaining the correct Client IP address when a Physical Load Balancer and a Web Server Configured With Proxy Plug-in Are Between The Client And Weblogic

  - by adejuanc

  Some Load Balancers like Big-IP have build in interoperability with Weblogic Cluster, this means they know how Weblogic understand a header named 'WL-Proxy-Client-IP' to identify the original client ip.The problem comes when you have a Web Server configured with weblogic plug-in between the Load Balancer and the back-end weblogic servers - WL-Proxy-Client-IP this is not designed to go to Web server proxy plug-in. The plug-in will not use a WL-Proxy-Client-IP header that came in from the previous hop (which is this case is the Physical Load Balancer but could be anything), in order to prevent IP spoofing, therefore the plug-in won't pass on what Load Balancer has set for it.So unfortunately under this Architecture the header will be useless. To get the client IP from Weblogic you need to configure extended log format and create a custom field that gets the appropriate header containing the IP of the client.On WLS versions prior to 10.3.3 use these instructions:You can also create user-defined fields for inclusion in an HTTP access log file that uses the extended log format. To create a custom field you identify the field in the ELF log file using the Fields directive and then you create a matching Java class that generates the desired output. You can create a separate Java class for each field, or the Java class can output multiple fields. For a sample of the Java source for such a class, seeJava Class for Creating a Custom ELF Field to import weblogic.servlet.logging.CustomELFLogger;import weblogic.servlet.logging.FormatStringBuffer;import weblogic.servlet.logging.HttpAccountingInfo;/* This example outputs the X-Forwarded-For field into a custom field called MyOriginalClientIPField */public class MyOriginalClientIPField implements CustomELFLogger{ public void logField(HttpAccountingInfo metrics,  FormatStringBuffer buff) {   buff.appendValueOrDash(metrics.getHeader("X-Forwarded-For");  }}In this case we are using 'X-Forwarded-For' but it could be changed for the header that contains the data you need to use.Compile the class, jar it, and prepend it to the classpath.In order to compile and package the class: 1. Navigate to <WLS_HOME>/user_projects/domains/<SOME_DOMAIN>/bin2. Set up an environment by executing: $ . ./setDomainEnv.sh This will include weblogic.jar into classpath, in order to use any of the libraries included under package weblogic.*3. Compile the class by copying the content of the code above and naming the file as:MyOriginalClientIPField.java4. Run javac to compile the class.$javac MyOriginalClientIPField.java5. Package the compiled class into a jar file by executing:$jar cvf0 MyOriginalClientIPField.jar MyOriginalClientIPField.classExpected output is:added manifestadding: MyOriginalClientIPField.class(in = 711) (out= 711)(stored 0%)6. This will produce a file called:MyOriginalClientIPField.jar This way you will be able to get the real client IP when the request is passing through a Load Balancer and a Web server before reaching WLS. Since 10.3.3 it is possible to configure a specific header that WLS will check when getRemoteAddr is called. That can be set on the WebServer Mbean. In this case, set that to be X-Forwarded-For header coming from Load Balancer as well.

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• How do I install Adobe Acrobat Pro From Web Premium CS4,....?

  - by RedBunny

  I am Running the new Ubuntu 12.04 Beta 2, and am looking to install Adobe Acrobat Pro from My CS4 Web Premium CD. Whenever I try and install the setup.exe I get the following error: Internal Error - invalid parameters recieved. in a Wine Program Crash box. I am running wine 1.5 and have tried 1.4 also. I have used winetricks and PlayOnLinux, and cannot get it to install with either program. Any help would be appreciated,.... Also If I cant get it installed does anyone know any programs that can link .PDF files to MySql databases in Linux ,....? I really need this to be able to host some web forms for work. Thanx in Advance,..... ~RedBunny

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• Should I still consider using Appcelerator Titanium for building mobile apps if I don't have any web dev skills?

  - by BeachRunnerJoe

  Hello, I'm an experienced desktop developer who's recently begun writing iOS apps and would like to venture into Android development as well. I've been hearing a lot of talk surrounding the Appcelerator Titanium framework lately, but I'm not sure I fully understand it's purpose. As I understand it, it's a framework for building native mobile apps using web technologies. If I don't have any web dev skills, are there any ways that using Appcelerator Titanium would benefit me? Thanks for your thoughts, I'm going to continue researching this right now.

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• WampServer 2.1.a est disponible, la plateforme de développement et de test d'applications Web met à jour ses outils

  WampServer 2.1.a est disponible La plateforme de développement et de tests d'applications Web est de retour Alter Way annonce la disponibilité de la nouvelle version de son outil WampServer. WampServer permet de développer et de tester des applications Web, dynamiques, en local sous Windows, à l'aide du serveur Apache, du langage de scripts PHP et d'une base de données MySQL. La plate-forme possède également PHPMyAdmin pour gérer plus facilement les bases de données. « Contrairement aux autres solutions, WampServer permet de reproduire fidèlement son serveur de production », se félicite l'éditeur. La version 2.1.a inclue ...

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