development environment - Page 134

When to start thinking about scalability?

- by Rits

I'm having a funny but also terrible problem. I'm about to launch a new (iPhone) app. It's a turn-based multiplayer game running on my own custom backend. But I'm afraid to launch. For some reason, I think it might become something big and that its popularity will kill my poor lonely single server + MySQL database. On one hand I'm thinking that if it's growing, I'd better be prepared and have a scalable infrastructure already in place. On the other hand I just feel like getting it out into the world and see what happens. I often read stuff like "premature optimization is the root of all evil" or people saying that you should just build your killer game now, with the tools at hand, and worry about other stuff like scalability later. I'd love to hear some opinions on this from experts or people with experience with this. Thanks!

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Best practice while marking a bug as resolved with Bugzilla (versioning of product and components)

- by Vincent B.

I am wondering what is the best way to handle the situation of marking a bug as resolved and providing a version of component/product in which this fix can be found. Context For a project I am working on, we are using Bugzilla for issue tracking, and we have the following: A product "A" with a version number like vA.B.C.D, This product "A" have the following components: Component "C1" with a version number like vA.B.C.D, Component "C2" with a version number like vA.B.C.D, Component "C3" with a version number like vA.B.C.D. Internally we keep track of which component versions have been used to generate the product A version vA.B.C.D. Example: Product "A" version v1.0.0.0 has been produced from component "C1" v1.0.0.3, component "C2" v1.3.0.0 and component "C3" v2.1.3.5. And Product "A" version v1.0.1.0 has been produced from component "C1" v1.0.0.4, component "C2" v1.3.0.0 and component "C3" v2.1.3.5. Each component is a SVN repository. The person in charge of generating the product "A" have only access to the different components tags folder in SVN, and not the trunk of each component repository. Problem Now the problem is the following, when a bug is found in the product "A", and that the bug is related to Component "C1", the version of product "A" is chosen (e.g. v1.0.0.0), and this version allow the developer to know which version of component "C1" has the bug (here it will be v1.0.0.3). A bug report is created. Now let's say that the developer responsible for component "C1" corrects the bug, then when the bug seems to be fixed and after some test and validation, the developer generates a new tag for component "C1", with the version v1.0.0.4. At this time, the developer of component "C1" needs to update the bug report, but what is the best to do: Mark the bug as resolved/fixed and add a comment saying "This bug has been fixed in the tags v1.0.0.4 of C1 component" ? Keep the bug as assigned, add a comment saying "This bug has been fixed in the tags v1.0.0.4 of C1 component, update this bug status to resolved for the next version of the product that will be generated with the newest version (v1.0.0.4 of C1)" ? Another possible way to deal with this problem. Right now the problem is that when a product component CX is fixed, it is not sure in which future version of the product A it will be included, so it is for me not possible to say in which version of the product it will be solved, but it is possible to say in which version of the Component CX it has been solved. So when do we need to mark a bug as solved, when the product A version include the fixed version of CX, or only when CX component has been fixed ? Thanks for your personal feedback and ideas about this !

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Beginning HTML and CSS [closed]

- by romani

My goal of learning HTML and CSS is to be able to modify popular scripts such as Wordpress, vBulletin, Drupal, etc. I haven't started yet learning CSS and HTML or XHTML. I see many, many books and tutorials out there so it is difficult to make a choice. I think most of web designers were like me in the past and have read many books. So, could you tell me about 1 good book for HTML and 1 good book for CSS? and if I should read the book from cover to cover or only learning the basics is enough for modifying Wordpress, for example!

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Becoming a "maintenance developer"

- by anon

So I've kind of been getting angry about the current position I'm in, and I'd love to get other developers' input on this. I've been at my current place of employment for about 11 months now. When I began, I was working on all new features. I basically worked on an entire new web project for the first 5-6 months I was here. After this, I was moved to more of a service oriented role (which was still great, all new stuff for me), and I was in this role for about the past 5-6 months. Here's where the problem comes in. Basically, a couple of days ago I was made the support/maintenance guy. Now, we have an IT support team, so I'm not talking that kind of support, I'm talking more of a second level support guy (when the guys on the surface can't really get to the root of the issue), coupled with working on maintenance issues that have been lingering in the backlog for a while. To me, a developer with about 3 years of experience, this is kind of disheartening. With the type of work place this is, I wouldn't be surprised if these support issues take up most of my days, and I barely make it to working on maintenance issues. Also, most of these support issues aren't even related to code, they are more or less just knowing the system architecture, working with making sure services are running/getting started properly, handling/fixing bad data, etc. I'm a developer, so this part sucks. Also, even when I do have time to work maintenance, these are basically just bug fixes/improving bad code, so this sucks as well, however at least it's related to coding. Am I wrong for getting angry here? I don't want to really complain about it, but to be honest, I wasn't spoken to about this or anything, I was kind of just sent an e-mail letting me know I'm the guy for this type of thing, and that was that. The entire team took a few minutes to give me their "that sucks" talk, because they know how annoying it is to be on support for the type of work we do, so I know I'm not the only guy that knows it's not that great of an opportunity. I'm just kind of on the fence about how to move forward. Obviously I'm just going to continue working for the time being, no point making a bad impression on anybody, but I'd like to know how you guys would approach this situation, or how you think I should be feeling about it/how you guys would feel. Thanks guys.

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Advantages and Disadvantages of the Waterfall Methodology

In my personal opinion I believe the waterfall method is one of the worst methodologies to use when developing larger systems because it leaves is no room for mistakes. As the name implies the waterfall methodology does not allow for projects to go back up stream to recover from design errors, missing and/or limited requirements. In addition, hidden bugs are not usually found until the testing phase. This can prove to be very costly and time consuming to the developer and the client. According to NCycles.com, the waterfall methodology structures a project into separate stages with defined deliverables from each phase. Define Design Code Test Implement Document and Maintain The advantages found by Ncycle.com to this methodology are: Ease in analyzing potential changes Ability to coordinate larger teams, even if geographically distributed Can enable precise dollar budget Less total time required from Subject Matter Experts The disadvantages found by Ncycle.com to this methodology are: Lack of flexibility Hard to predict all needs in advance Intangible knowledge lost between hand-offs Lack of team cohesion Design flaws not discovered until the Testing phase References: NCycles.com (2002). Retrieved from http://www.ncycles.com/e_whi_Methodologies.htmmethodology on April 17, 2009

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What are the IEEE and ACM good for?

- by Joshua Fox

Membership in the IEEE and ACM is sometimes portrayed as a sign of professionalism. But all that is involved, as far as I can tell, is sending them your money. In return, besides the potential resume line, these organizations sponsor conferences and journals. I can always attend a conference or subscribe to or submit a paper to a journal, whether I am a member or not. If being a member makes some of that cheaper, or is a prerequisite for admission then OK, but I still don't see the purpose of these organizations. The answer, as far as I can gather, is that their most important value is to provide some reading material. I'd suggest that this is not worth the money given the wide availability of other valuable reading materials.

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Web framework able to handle many concurrent users [closed]

- by Jonas

Social networking sites needs to handle many concurrent users e.g. for chat functionality. What web frameworks scales well and are able to handle more than 10.000 concurrent users connected with Comet or WebSockets. The server is a Linux VPS with limited memory, e.g. 1GB-8GB. I have been looking for some Java frameworks but they consume much memory per connection. So I'm looking for other alternatives too. Are there any good frameworks that are able to handle more than 10.000 concurrent users with limited memory resources?

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How to manage security of these self hosted web apis, to ensure that the request coming for accessing data is authenticated?

- by Husrat Mehmood

Let's pretend I am going to work on an enterprise application. Say I have 11 modules in the application and I would have to develop Dashboards for every role in the organization for whom I are going to develop application. We Decided to use Asp.Net Web Api and return json data from our apis. We are going to include 11 Self hosted web apis projects in our application (one self hosted web api) for every module. All 11 modules are connected to one Sql server 2012 Database. Then once api is ready we would have to create Business Dashboards (Based upon roles in Organization). So Now my web api client is Asp.Net Mvc application.Asp.Net mvc will consume those web apis. Here is the part for whom all explanation is done. How should I manage Security of all 11 self hosted web apis? How should I only authenticated request is coming? If I authenticate user by login and password and then redirect user to appropriate Dashboard designed for the role that user have and load data by consuming web apis. How should I ensure that the request coming for accessing data is authenticated?

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Where to find a mentor?

- by Fanatic23

I have been looking around for resources that discuss about mentors, including questions in the stackexchange network. I see that the general response has been to join open source projects and/or check out local user groups if there exists any. Are we sure that joining open source project can get me a mentor? It can grab eyeballs, yes, if the project is exciting enough but a mentor? I am not so sure. What do you guys think? Finally, I'd want my mentor to be in a specific domain as opposed to just being a coding wizard and that makes the search even more difficult. Suggestions?

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Web interface with FastCGI or with direct HTTP?

- by Basile Starynkevitch

Let's assume I want (for fun at start) to play with some new DSL (domain specific language) idea. And I really want its user[s] (probably only me at first) to interact thru a web interface. I'll probably implement it in C++ (probably using LLVM). Should I use an HTTP server library (like libonion or microhttpd) to talk directly HTTP or should I use FastCGI? In particular, I am noticing that several recent web frameworks (Opa, Ocsigen, ...) do not have any FastCGI interface but only HTTP one.... So my feeling is that FastCGI is really out of fashion.... Any opinions on that? Do you know recently started project using FastCGI ? (and what about SCGI?)

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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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Is this Ubuntu One DBus signal connection code correct?

- by Chris Wilson

This is my first time using DBus so I'm not entirely sure if I'm going about this the right way. I'm attempting to connect the the Ubuntu One DBus service and obtain login credentials for my app, however the slots I've connected to the DBus return signals detailed here never seem to be firing, despite a positive result being returned during the connection. Before I start looking for errors in the details relating to this specific service, could someone please tell me if this code would even work in the first place, or if I'm done something wrong here? int main() { UbuntuOneDBus *u1Dbus = new UbuntuOneDBus; if( u1Dbus->init() ){ qDebug() << "Message queued"; } } UbuntuOneDBus::UbuntuOneDBus() { service = "com.ubuntuone.Credentials"; path = "/credentials"; interface = "com.ubuntuone.CredentialsManagement"; method = "register"; signature = "a{ss} (Dict of {String, String})"; connectReturnSignals(); } bool UbuntuOneDBus::init() { QDBusMessage message = QDBusMessage::createMethodCall( service, path, interface, method ); bool queued = QDBusConnection::sessionBus().send( message ); return queued; } void UbuntuOneDBus::connectReturnSignals() { bool connectionSuccessful = false; connectionSuccessful = QDBusConnection::sessionBus().connect( service, path, interface, "CredentialsFound", "a{ss} (Dict of {String, String})", this, SLOT( credentialsFound() ) ); if( ! connectionSuccessful ) qDebug() << "Connection to DBus::CredentialsFound signal failed"; connectionSuccessful = QDBusConnection::systemBus().connect( service, path, interface, "CredentialsNotFound", "(nothing)", this, SLOT( credentialsNotFound() ) ); if( ! connectionSuccessful ) qDebug() << "Connection to DBus::CredentialsNotFound signal failed"; connectionSuccessful = QDBusConnection::systemBus().connect( service, path, interface, "CredentialsError", "a{ss} (Dict of {String, String})", this, SLOT( credential if( ! connectionSuccessful ) qDebug() << "Connection to DBus::CredentialsError signal failed"; } void UbuntuOneDBus::credentialsFound() { std::cout << "Credentials found" << std::endl; } void UbuntuOneDBus::credentialsNotFound() { std::cout << "Credentials not found" << std::endl; } void UbuntuOneDBus::credentialsError() { std::cout << "Credentials error" << std::endl; }

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Extending SSIS with custom Data Flow components (Presentation)

Download the slides and sample code from my Extending SSIS with custom Data Flow components presentation, first presented at the SQLBits II (The SQL) Community Conference. Abstract Get some real-world insights into developing data flow components for SSIS. This starts with an introduction to the data flow pipeline engine, and explains the real differences between adapters and the three sub-types of transformation. Understanding how the different types of component behave and manage data is key to writing components of your own, and probably should but be required knowledge for anyone building packages at all. Using sample code throughout, I will show you how to write components, as well as highlighting best practice and lessons learned. The sample code includes fully working example projects for source, destination and transformation components. Presentation & Samples (358KB) Extending SSIS with custom Data Flow components.zip

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Join Me May 19th for 24 Hours of PASS

- by KKline

Check out all the great SQL Server sessions you can attend for FREE in this on-line event....(read more)

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Publish/Subscribe/Request for exchange of big, complex, and confidential data?

- by Morten

I am working on a project where a website needs to exchange complex and confidential (and thus encrypted) data with other systems. The data includes personal information, technical drawings, public documents etc. We would prefer to avoid the Request-Reply pattern to the dependent systems (and there are a LOT of them), as that would create an awful lot of empty traffic. On the other hand, I am not sure that a pure Publisher/Subscriber pattern would be apropriate -- mainly because of the complex and bulky nature of the data to be exchanged. For that reason we have discussed the possibility of a "publish/subscribe/request" solution. The Publish/Subscribe part would be to publish a message to the dependent systems, that something is ready for pickup. The actual content is then picked up by old-school Request-Reply action. How does this sound to you?? Regards, Morten

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Would you use UML if it kept stakeholders from requesting changes frequently?

- by Huperniketes

As much as programmers hate to document their code/system and draw UML (especially, Sequencing, Activity and State machine diagrams) or other diagramming notation, would you agree to do it if it kept managers from requesting a "minor change" every couple of weeks? IOW, would you put together visual models to document the system if it helped you demonstrate to managers what the effect of changes are and why it takes so long to implement them? (Edited to help programmers understand what type of answer I'm looking for.) 2nd edit: Restating my question again, "Would you be willing to use some diagramming notation, against your better nature as a programmer, if it helped you manage change requests?" This question isn't asking if there might be something wrong with the process. It's a given that there's something wrong with the process. Would you be willing to do more work to improve it?

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I know fundamental programming. But how do I get started in game development now?

- by Rohan Menon

I'm a 20 year old programming student. I know fundamental programming in BASIC, C, C++ and JAVA. What I wanted to ask is, where do I go from here? Are there any books that the community can mention that will help me develop a game or at least learn game development? I've had a lot of ideas and really want to make some sort of prototype to see if I'm suited for the industry. I really don't mind learning any new languages but I need to know what I should begin with. A good book that will help with a little more understanding as I go up will be very helpful. Maybe a tutorial to develop some basic 2D games like a side-scroller, snake or pocket tanks in an easy to understand SDK? I know that to get some credit under your belt, you need to be able to make a few games on your own. Also, what platform should I start on? The PC, iOS or Android (as an introduction) for now. I don't want to get into high level game design just yet. Just something a bit basic to help out in future development. Anything pointing me in the right direction will be really really helpful. Edit: Also, I want to say that I'm looking towards this from a game designer's point of view more than a game programmer. I want suggestions on any SDKs or easy to use programs I can use to understand game design. Then delve deeper into the programming after that. Not as employment but as developing your own games (for now).

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how to save a gtktextbuffer content in file

- by user1565593

i tried to save sengtktextbuffer content in a file. my code seens working but i have a problem in file. some characters are unreadable in outfile outfile my code: def on_save_clicked(self, widget, data=None): start = self.textbuffer.get_start_iter() end = self.textbuffer.get_end_iter() this = self.textbuffer.get_text(start, end, False) format = self.textbuffer.register_serialize_tagset(this) data = self.textbuffer.serialize(self.textbuffer, format, start, end) outfile = open("/home/christophe/toto.txt", "w") outfile.write(data) outfile.close() what is wrong in my code? thanks for your help

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How do I make the launcher progress bar work with my application?

- by Kevin Gurney

Background Research I am attempting to update the progress bar within the Unity launcher for a simple python/Gtk application created using Quickly called test; however, following the instructions in this video, I have not been able to successfully update the progress bar in the Unity launcher. In the Unity Integration video, Quickly was not used, so the way that the application was structured was slightly different, and the code used in the video does not seem to function properly without modification in a default Quickly ubuntu-application template application. Screenshots Here is a screenshot of the application icon as it is currently displayed in the Unity Launcher. Here is a screenshot of the kind of Unity launcher progress bar functionality that I would like (overlayed on mail icon: wiki.ubuntu.com). Code class TestWindow(Window): __gtype_name__ = "TestWindow" def finish_initializing(self, builder): # pylint: disable=E1002 """Set up the main window""" super(TestWindow, self).finish_initializing(builder) self.AboutDialog = AboutTestDialog self.PreferencesDialog = PreferencesTestDialog # Code for other initialization actions should be added here. self.add_launcher_integration() def add_launcher_integration(self): self.launcher = Unity.LauncherEntry.get_for_desktop_id("test.destkop") self.launcher.set_property("progress", 0.75) self.launcher.set_property("progress_visible", True) Expected Behavior I would expect the above code to show a progress bar that is 75% full overlayed on the icon for the test application in the Unity Launcher, but the application only runs and displays no progress bar when the command quickly run is executed. Problem Investigation I believe that the problem is that I am not properly getting a reference to the application's main window, however, I am not sure how to properly fix this problem. I also believe that the line: self.launcher = Unity.LauncherEntry.get_for_desktop_id("test.destkop") may be another source of complication because Quickly creates .desktop.in files rather than ordinary .desktop files, so I am not sure if that might be causing issues as well. Perhaps, another source of the issue is that I do not entirely understand the difference between .desktop and .desktop.in files. Does it possibly make sense to make a copy of the test.desktop.in file and rename it test.desktop, and place it in /usr/share/applications in order for get_for_desktop_id("test,desktop") to reference the correct .desktop file? Related Research Links Although, I am still not clear on the difference between .desktop and .desktop.in files, I have done some research on .desktop files and I have come across a couple of links: Desktop Entry Files (library.gnome.org) Desktop File Installation Directory (askubuntu.com) Unity Launcher API (wiki.ubuntu.com) Desktop Files: putting your application in the desktop menus (developer.gnome.org) Desktop Menu Specification (standards.freedesktop.org)

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Is porting a Windows application to Mac worth it ?

- by mikel

I have a C# Windows application that sells for $35, and fairly regularly receive requests for a version for OS X too. I don't have any experience with Mac so far though, and so am not sure exactly how much work that would involve and if it would be worth it. If anyone's been in a similar position, it'd be very helpful to know: Roughly how many more (%) sales can you expect by porting to Mac ? Would you say it's worth the investment of a new Macbook Pro and the time of learning and porting to Objective-C ? Thanks in advance.

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ATI Radeon HD 6870 Driver fails to install default-policy.sh does not support version

- by Rogue Coder

I'm running Ubuntu 11.04 Beta, with everything updated completely. I'm using Ubuntu Classic, because Unity fails to run, supposedly because of my video card. The drivers for the Radeon HD 6870 series is apparently lacking, but I found a post stating the newest version has full support for Ubuntu Natty Narwhal. That post is slightly old, so i grabbed 11.3 for Ubuntu x86 off the ATI website. When I run the installation program, I receive the following error: > ./ati-driver-installer-11-3-x86.x86_64.run Created directory fglrx-install.uREFoO Verifying archive integrity... All good. Uncompressing ATI Catalyst(TM) Proprietary Driver-8.831.2......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... ===================================================================== ATI Technologies Catalyst(TM) Proprietary Driver Installer/Packager ===================================================================== Error: ./default_policy.sh does not support version default:v2:i686:lib::none:2.6.38-8-generic-pae:; make sure that the version is being correctly set by --iscurrentdistro ===================================================================== ATI Technologies Catalyst(TM) Proprietary Driver Installer/Packager ===================================================================== Error: ./default_policy.sh does not support version default:v2:i686:lib::none:2.6.38-8-generic-pae:; make sure that the version is being correctly set by --iscurrentdistro Removing temporary directory: fglrx-install.uREFoO > I would love to get the latest ATI drivers working so that I can try out Unity!

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Is Paypal the best solution for payment gateway for a website?

- by Pennf0lio

I have a realty website that needs a payment gateway for their property reservation. The reservation fee range from $500-$600 and about 5-6 people per month. I was wondering if Paypal is the best solution for accepting Payment. What will be the Pros and Cons using Paypal. Paypal was my first choice because It's easy to integrate on my existing website and I wouldn't be minding so much on the security. P.S. It's not a part of the question, But If you can site some realty website that accept payment and would be a good inspiration. It would be highly appreciated. Thanks!

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How to deal with social login

- by Matteo Pagliazzi

In my new web app I'm going to allow social login through Twitter (maybe), Facebook and Google and I'm in search of the best way to do it. Actually I'm using Rails with Devise + Omniauth and this is the problem: Should I ask the user to choose a password so that he can login without a social network? Or maybe the user should be able to set a password if he want (for example when editing his account?) The second way seems the best one but since Twitter doesn't provide user email and google doesn't provide an username I'll probably have to ask the user for username/email when he log in so in that case I may also ask for the password... waht do you think?

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how to set the border = 0 on GtkBox (dialog-Vbox-Element) in Glade on Dialog, which was creadted via "quickly add dialog"

- by Marian Lux

To make the Toolbar look native in Ubuntu (like the application in this video: https://www.youtube.com/watch?feature=player_embedded&v=sO8hiPreNBg), I don't want to show a border. In my main window of my application I am able to set the property for the border width to zero on the GtkBox under tab "common". But on a dialog (created via "quickly add dialog") there is no option on the GtkBox to set the property under "common". The property for the border width sill not appears under common! What can I do to solve this problem? I tried to create a Window-Element and tried to delete the Dialog-Element. Result: Then I was able to set this property in Glade but I could not do anything with the Window-Element and its Child-Elements (e.g. set the native look for its toolbar) in the corresponding .py-File (for the ui-File) because I destroyed dependencies...

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