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• How do you put a database online?

  - by Dezrik

  I have a very beginner question regarding web development. I've had some experience with JSP, Hibernate, and MAMP to create a simple system for tracking inventory and sales. But this was all done locally on one computer. This time, I want to create a system that could be accessible online. It's to help my mother track her business wherever she goes. So there would be similar aspects like tracking inventory and sales. I understand that you have to have a server in which to host all the files in. But I don't understand how you can access your database online. Or what sorts of applications or products should be used. Currently the host of my database is localhost. How do put it online such that you can still do CRUD operations? Are there any guides to do this?

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• Multilevel Queue Scheduling (MQS) with Round Robin

  - by stackuser

  I'm trying to use MQS to create a Gantt chart of 5 processes (P1-P5) as well as their waiting, response, and turnaround times (and averages of those metrics) within a CPU task schedule. Here's the basic table of arrival times and bursts: Here's my actual work version after ticking off the finished processes. The time quantum for each time slice is (2 queues) TQ1=4 and TQ2=3. Note that I'm doing MQS and NOT MLFQ: It just doesn't feel like I'm doing MQS right here, I know this gets a little complex but maybe someone can point out where I'm going totally wrong.

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• Releasing a project under GPL v2 or later without the source code of libraries

  - by Luciano Silveira

  I wrote a system in Java that I want to release under the terms of GPL v2 or later. I've used Apache Maven to deal with all the dependencies of the system, so I don't have the source code of any of the libraries used. I've already checked, all the libraries were released under GPL-compatible licenses (Apache v2, 3-clause BSD, MIT, LGPL v2 and v2.1). I have 3 questions about this scenario: 1) Can I release a package with only the binaries of code I wrote, not including the libraries, and distribute only the source code I wrote? 2) Can I release a package with all the binaries, including the libraries, and distribute only the source code I wrote? 3) Can I release a package with all the binaries, including the libraries, and distribute only the source code I wrote plus the source code of the libraries licensed under the LGPL license?

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• Is it better to build HTML Code string on the server or on the client side?

  - by Ionut

  The result of the following process should be a html form. This form's structure varies from one to user. For example there might be a different number of rows or there may be the need for rowspan and colspan. When the user chooses to see this table an ajax call is made to the server where the structure of the table is decided from the database. Then I have to create the html code for the table structure which will be inserted in the DOM via JavaScript. The following problem comes to my mind: Where should I build the HTML code which will be inserted in the DOM? On the server side or should I send some parameters in the ajax call method and process the structure there? Therefore the main question involves good practice when it comes to decide between Server side processing or client side processing. Thank you!

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• How do I handle priority and propagation in an event system?

  - by Peeter

  Lets say I have a simple event system with the following syntax: object = new Object(); object.bind("my_trigger", function() { print "hello"; }); object.bind("my_trigger", function() { print "hello2"; }); object.trigger("my_trigger"); How could I make sure hello2 is printed out first (I do not want my code to depend on which order the events are binded). Ontop of that, how would I prevent my events from propagating (e.g. I want to stop every other event from being executed)

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• Why is iOS "jailbreaking" CPU specific? [closed]

  - by Ted Wong

  Recently, iOS 6 was "jailbroken" but only on the Apple A4 CPU. Why is the "jailbreaking" process specific to a CPU? From Wikipedia: ... "iOS jailbreaking is the process of removing the limitations imposed by Apple on devices running the iOS operating system through the use of hardware/software exploits – such devices include the iPhone, iPod touch, iPad, and second generation Apple TV. Jailbreaking allows iOS users to gain root access to the operating system""" ...

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• What should I learn that I missed by not going to school?

  - by BinaryMuse

  I'm a software engineer at a local university, and I feel I'm able to competently do my job, but recently I've been interested in "filling in" the gaps in my knowledge. I suspect I would have learned some of this in school; for example, I don't have a lot of knowledge of sorting algorithms (something I feel is pretty common in college). So, what knowledge am I likely missing by not going to college that I could study on my own? Bonus points for listing resources that might put me on the right track! Some background: I've programmed in PHP, Java, and Ruby (more seriously in Java and Ruby than PHP); I have some experience with C/C++, though my workload doesn't really lend itself to those languages; I work mostly (recently) with the web, using frameworks such as CakePHP and Rails. I'm familiar with SQL (though probably not with some of the theory). Note: The university I work for has no technical classes, so taking courses on the university's dime is a great idea but not possible for me. :)

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• In this slow Job Market, I have no choice to take a Job that uses VB.NET and is going to use C#. Advice?

  - by Xaisoft

  I really don't want to do VB.NET, but I need a Job and I need a Job Fast. The two positions I am looking at both have existing apps in VB.NET, but are looking to convert them to C# and do new development in C#, but as well all know, sometimes this doesn't happen for a while and you get stuck with the main language. My background is in C# and after looking at VB.NET, my head is hurting. Any advice as I tackle a Job like this. As I said, I preferably want stick with C#, but today, one may have no choice, so I have to just take what I get. I am looking for advice on this for those who have experienced it, are experiencing it, and those who have not.

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• Support for non-english characters?

  - by TomJ

  Is support for non-english characters common in programming languages? I mean, technically, I would think it is feasable, but I don't have any experience in anything other than english, so I don't know how common it is. I know that there are non-english based programming languages, but can something like C#, C++, C, Java, or Python support non-english classes/methods/variables? Example in go (url, http://play.golang.org/p/wRYCNVdbjC) package main import "fmt" type ?? struct { ?? string } func main() { fmt.Println("Hello, ??") ?? := new(??) ??.?? = "hello world" fmt.Println(??.??) }

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• What is a good GUI text editor with code folding on Linux

  - by quanticle

  When I'm on Linux, I usually program using either gvim or emacs (depending on the language I'm working in, and the configuration of the machine). However, one thing I miss from the Windows world is code folding. Editors like Notepad++ and IDEs like Visual Studio allow shrink, or fold, blocks of code into single line headings. Are there any Linux editors with this facility? I know Eclipse can do code folding, but I don't want to launch Eclipse just to edit a HTML file.

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• What license is the GPL License licensed under?

  - by IQAndreas

  The actual GPL License (that is, the text that contains the words "The licenses for most software and other practical works are designed...") is a document; I would assume therefore that it is under some sort of copyright? What license is this license licensed under? That is, if I were to include the body of the GPL License in my own projects (and perhaps create a derivative work) what limitations am I under?

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• Converting ANTLR AST to Java bytecode using ASM

  - by Nick

  I am currently trying to write my own compiler, targeting the JVM. I have completed the parsing step using Java classes generated by ANTLR, and have an AST of the source code to work from (An ANTLR "CommonTree", specifically). I am using ASM to simplify the generating of the bytecode. Could anyone give a broad overview of how to convert this AST to bytecode? My current strategy is to explore down the tree, generating different code depending on the current node (using "Tree.getType()"). The problem is that I can only recognise tokens from my lexer this way, rather than more complex patterns from the parser. Is there something I am missing, or am I simply approaching this wrong? Thanks in advance :)

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• Using PHP version 5.2 or 5.3 for end-user commercial products?

  - by Ash

  I'm doing research on what version of PHP to use when creating commercial scripts that will be sold to end users. Although the available stats aren't great, PHP 5.3 shows a 18.5% adoption rate. I'd like to use Symfony to create these scripts and it requires 5.3.2 which shows an even lower adoption rate (roughly 13% of that 18.5% use less than 5.3.2). Would I be risking much by jumping straight to PHP 5.3.2+ or should I ignore the stats and plough ahead?

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• Duplication of code (backend and javascript - knockout)

  - by Michal B.

  We have a new developer in our team. He seems a smart guy (he just came in so I cannot really judge). He started with implementing some small enhancements in the project (MVC3 web application using javascript - jquery and knockout). Let's say we have two values: A - quite complex calculation C - constant B = A + C On the screen there is value B and user can change it (normal texbox). When B changes, A changes as well because C is constant. So there is linear dependency between A and B. Now, all the calculations are done in the backend, but we need to recalculate A as user changes B (in js, I would use knockout). I thought about storing old A and B and when B changes by 10 then we know that new A will be old A + 10. He says this is dirty, because it's duplication of code (we make use of the fact that they are dependent and according to him that should be only in one place in our app). I understand it's not ideal, but making AJAX request after every key press seems a bit too much. It's a really small thing and I would not post if we haven't had long discussion about it. How do you deal with such problems? Also I can imagine that using knockout implies lots of calculations on the client side, which very often leads to duplication of the same calculations from the backend. Does anyone have links to some articles/thoughts on this topic?

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• Would a multitouch capable PC allow me to do Android development simulating the touch UI without an Android device ?

  - by Scott Davies

  Hi, I recently purchased a Samsung Galaxy Tab as a reference implementation (phone and first gen Android tablet), of Android 2.x for app development. I have noticed a slew of Android 3.0 slates being talked about at CES 2011 (Motorola XOOM, etc.). If I had a multitouch PC with the Android SDK/Emulator on it, would this allow me to more closely approximate device simulation by allowing user input via the multitouch screen ? Would it work via touch just like Windows 7 recognizes touch as mouse style input ? Has anyone done this ? Thanks, Scott

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• Is this the right strategy to convert an in-level order binary tree to a doubly linked list?

  - by Ankit Soni

  So I recently came across this question - Make a function that converts a in-level-order binary tree into a doubly linked list. Apparently, it's a common interview question. This is the strategy I had - Simply do a pre-order traversal of the tree, and instead of returning a node, return a list of nodes, in the order in which you traverse them. i.e return a list, and append the current node to the list at each point. For the base case, return the node itself when you are at a leaf. so you would say left = recursive_function(node.left) right = recursive_function(node.right) return(left.append(node.data)).append(right);` Is this the right approach?

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• Nested Classes: A useful tool or an encapsulation violation?

  - by Bryan Harrington

  So I'm still on the fence as to whether or not I should be using these or not. I feel its an extreme violation of encapsulation, however I find that I am able to achieve some degree of encapsulation while gaining more flexibility in my code. Previous Java/Swing projects I had used nested classes to some degree, However now I have moved into other projects in C# and I am avoid their use. How do you feel about nested classes?

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• Using Sql Server Change Data Capture with a frequently changing schema

  - by Pete

  We are looking into enabling Sql Server Change Data Capture for a new subsystem we are building. It's not really because we need it, but we are being pushed for having a complete history traceability, and CDC would nicely solve this requirement with minimum effort on our parts. We are following an agile development process, which in this case means that we frequently make changes to the database schema, e.g. adding new columns, moving data to other columns, etc. We did a small test where we created a table, enabled CDC for that table, and then added a new column to the table. Changes to the new column is not registered in the CDC table. Is there a mechanism to update the CDC table to the new schema, and are there any best practices to how you deal with captured data when migrating the database schema?

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• php templating with codeigniter

  - by JaPerk14

  I am currently develop a website application in codeigniter, and I'd like to do something in PHP / CodeIgniter where I can make a common template for separate sections of the website. I was thinking that I would keep the header / footer in a separate php files & include them separately. The thing I'm not sure about is the content beneath the header and above the footer. This website application will contain a lot of different pages, so I'm having a hard time figuring how what's the best way to do this.

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• Any suggestions how it would be good to promote software in a small company ?

  - by Derfder

  Ok, I know if I am Red hat or other giant and offer some support etc. I can be profitable, in fact, Red Hat is doing quite well. However, what about a small company where I create a small program. e.g. an instant messenger for a windows or linux (just as an illustration) and I want to sell it. But how can I sell it if it is free and everybody can download it? Any advice? I like the idea of FSF by Richard Stallman, however I am missing the way how to sell my software under GNU/GPL licence. Any advice, how can I solve this problem? Any profitable small business software developers around with their opinion? Any links or names of small companies taht I can look at and study their model of business?

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• Who does code coverage testing?

  - by Athiruban

  Recently, I was given an opportunity to increase the code coverage in a project based on Java Swing, MySQL and other technologies. They told me to bring the code coverage to 100%, while it was only 45% at the time I joined. I am just starting, not a professional developer, right from the beginning I felt bad even though I write and understand computer programs well. (The developed code contains a lot of technical stuff like Generics and no documentation about the code is available.) Has anyone experienced the same situation before? Please tell who is the right person to do the job.

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• MonoGame; reliable enough to be accepted on iOS, Win 8 and Android stores?

  - by Serguei Fedorov

  I love XNA; it simplifies rendering code to where I don't have to deal with it, it runs on C# and has very fairly large community and documentation. I would love to be able to use it for games across many platforms. However, I am a little bit concerned about how well it will be met by platform owners; Apple has very tight rules about code base but Android does not. Microsoft's new Windows 8 platforms seems to be pretty lenient but I am not sure oh how they would respond to an XNA project being pushed to the app store (given they suddenly decided to dump it and force developers to use C++/Direct3D). So the bottom line is; is it safe to invest time and energy into a project that runs on MonoGame? In the end, is is possible to see my game on multiple platforms and not be shot down with a useless product?

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• iOS and Server: OAuth strategy

  - by drekka

  I'm trying to working how to handle authentication when I have iOS clients accessing a Node.js server and want to use services such as Google, Facebook etc to provide basic authentication for my application. My current idea of a typical flow is this: User taps a Facebook/Google button which triggers the OAuth(2) dialogs and authenticates the user on the device. At this point the device has the users access token. This token is saved so that the next time the user uses the app it can be retrieved. The access token is transmitted to my Node.js server which stores it, and tags it as un-verified. The server verifies the token by making a call to Facebook/google for the users email address. If this works the token is flagged as verified and the server knows it has a verified user. If Facebook/google fail to authenticate the token, the server tells iOS client to re-authenticate and present a new token. The iOS client can now access api calls on my Node.js server passing the token each time. As long as the token matches the stored and verified token, the server accepts the call. Obviously the tokens have time limits. I suspect it's possible, but highly unlikely that someone could sniff an access token and attempt to use it within it's lifespan, but other than that I'm hoping this is a reasonably secure method for verification of users on iOS clients without having to roll my own security. Any opinions and advice welcome.

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• Architectural Composition Languages

  - by C. Lawrence Wenham

  Recently stumbled upon this paper (PDF) talking about ACLs, or Architectural Composition Languages. They're a fusion of two earlier lines of research: Architectural Definition Languages (such as UML) and Object Composition Languages (such as XAML, WWF, or scripting languages). The goal of an ACL is to have a high-level description of a program's architecture which can also be compiled into a runnable program. The high-level description assists automated analysis, while the 'executability' means changes can be tested immediately. You would still author the components of the program in a conventional programming language (C, Java, Python, etc), but they would be composed into a complete program by the ACL. One of the expected benefits is that a program can be ported to a different platform by swapping in "similar but different" components. I've been hankering for something like this for a long time (see this answer I gave on a StackOverflow question a few years ago). The paper mentions that the researchers were working on a language called ACL/1 that initially targeted Java, but would be ported to support .Net as well. However, I can't find any more mention of ACL/1 anywhere. Has there been any more work done on this? Are there any other implementations of the ACL concept that are available for use or experimentation?

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• Is it convenient to use a XML/JSON generated based system? [closed]

  - by Marcelo de Assis

  One of my clients insists that we missed a requisite for the project(a little social network, using PHP + MySql), is that all queries are made from XML / JSON static files (using AJAX) and not directly from the database. Edit: The main reason, stated by client, is a way to economize bandwith. Even the file loading, has to be using AJAX, to avoid server side processing. We will still use a database to store and insert data. These XML / JSON files will be (re) generated whenever any data is changed by CMS or users. As the project was developed without this "technique", we'll have a lot of work ahead, so I would like to avoid that. I'm asking if it's convenient to use a XML generated based system, because I think a database is already "optimized" and secure to deal with a lot of data traffic. Other issue I'm afraid of, is a chance of conflict when a user is trying to read a XML/JSON which is being just generated.

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