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• Virtual Networks in Oracle Solaris - Part 5

  - by user12616590

             A         long         time      ago in a    blogosphere   far, far away... I wrote four blog entries to describe the new network virtualization features that were in Solaris 11 Express: Part 1 introduced the concept of network virtualization and listed the basic virtual network elements. Part 2 expanded on the concepts and discussed the resource management features. Part 3 demonstrated the creation of some of these virtual network elements. Part 4 demonstrated the network resource controls. I had planned a final entry that added virtual routers to the list of virtual network elements, but Jeff McMeekin wrote a paper that discuses the same features. That paper is available at OTN. And this Jeff can't write any better than that Jeff... All of the features described in those blog entries and that paper are also available in Solaris 11. It is possible that some details have changed, but the vast majority of the content is unchanged.

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• Groovy JUnit test support

  - by Martin Janicek

  Good news everyone! I've implemented support for the Groovy JUnit tests which basically means you can finally use Groovy in the area where is so highly productive! You can create a new Groovy JUnit test in the New File/Groovy/Groovy JUnit test and it should behave in the same way as for Java tests. Which means if there is no JUnit setup in your project yet, you can choose between JUnit 3 and JUnit 4 template and with respect to your choice the project settings will be changed (in case of the Maven based projects the correct dependencies and plugins are added to the pom.xml and in case of the Ant based project the JUnit dependency is configured). Or if the project is already configured, the correct template will be used. After that the test skeleton is created and you can write your own code and of course run the tests together with the java ones. Some of you were asking for this feature and of course I don't expect it will be perfect from the beginning so I would be really glad to see some constructive feedback about what could be improved and/or redesigned ;] ..at the end I have to say that the feature is not active for the Ant based Java EE projects yet (I'm aware of it and it will be fixed to the NetBeans 7.3 final - actually it will be done in a few days/weeks, just want you to know). But it's already complete in all types of the Maven based projects and also for the Ant based J2SE projects. And as always, the daily build where you can try the feature can be downloaded right here, so don't hesitate to try it!

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• Pidgin XML

  - by David Totzke

  I'm looking at an xml document that gets passed to a COM object (yes, I said the "C" word) to save a new record.  You can tell by the "new|" at the top of the file before the xml declaration.  If we were saving, there would be "edit|" at the top.  Couldn't you just have a root element with something like: <myRootElement mode="new"> Ah, here's why that won't work... There's no single root element but that's ok because next we find that this document is actually several documents.  <?xml version="1.0"?> appears several times.  The final document opens with <myElementStart> and closes with <myElementEnd> so it's not even well-formed. This isn't a style thing.  This is broken.  I mean, basic well-formed XML only has two rules; three if you count the xml declaration but it works as a document for DTO purposes without it. One root element. Close all elements with a matching tag. As a result, both ends of this conversation need to speak the same dialect of broken XML in order to communicate.  To join the conversation, you must also learn pidgin XML. How can you start out so right - XML being the obvious choice in this instance - and then go so horribly wrong? Dave Just because I can…

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• How to minimize the usage of static variables and objects

  - by Peter Penzov

  I'm trying to implement this JavaFX code where I want to call remote Java class and pass boolean flag: final CheckMenuItem toolbarSubMenuNavigation = new CheckMenuItem("Navigation"); toolbarSubMenuNavigation.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent e) { //DataTabs.renderTab = toolbarSubMenuNavigation.isSelected(); DataTabs.setRenderTab(toolbarSubMenuNavigation.isSelected()); // call here the getter setter and send boolean flag System.out.println("subsystem1 #1 Enabled!"); } }); Java class which I want to call: public class DataTabs { private static boolean renderTab; // make members *private* private static TabPane tabPane; public static boolean isRenderTab() { return DataTabs.renderTab; } public static void setRenderTab(boolean renderTab) { DataTabs.renderTab = renderTab; tabPane.setVisible(renderTab); } // somewhere below // set visible the tab pane TabPane tabPane = DataTabs.tabPane = new TabPane(); tabPane.setVisible(renderTab); } This implementation works but I want to optimize it to use less static variables and objects. Can you tell me which sections of the code how can be optimized?

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• Windows Embedded Compact 7

  - by Valter Minute

  This will be the official name of the new release of Windows CE. Windows Embedded Compact 7 is available as a public CTP and it already supports a wide range of CPUs and both the device emulator and VirtualPC emulated environments. So I’ll have to learn a new (and longer) name for my favorite OS… but I (and all my two readers!) will be able to test it as soon as the download from connect web site completes (I'm sorry for my readers, but you'll have to download it by yourselves). Here’s a link for the download (it's free but you’ll have to register on connect with a valid LiveId): https://connect.microsoft.com/windowsembeddedce Remember that this is still a beta (or “Community Technology Preview” if you speak marketing language) and so it’s better to not install it on your main development PC (or, at least, backup everything before installation) and that the features and performances you’ll get from this beta may not be the same ones of the final release of the OS. You can discover the new features of Windows Embedded Compact on the new “official” webpage on microsoft website: http://www.microsoft.com/windowsembedded/en-us/products/windowsce/compact7.mspx or on Olivier’s blog: http://blogs.msdn.com/b/obloch/archive/2010/06/01/windows-embedded-compact-7-announced-and-public-ctp-available.aspx I hope to be able to post some interesting content about Windows Embedded Compact 7 soon (and maybe be able to shorten it’s name in CE7 in my blog posts, when I'll ensure that both my readers are not worketing for Microsoft's marketing department …). Technorati Tags: "Windows Embedded Compact 7"

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• Collision checking problem on a Tiled map

  - by nosferat

  I'm working on a pacman styled dungeon crawler, using the free oryx sprites. I've created the map using Tiled, separating the floor, walls and treasure in three different layers. After importing the map in libGDX, it renders fine. I also added the player character, for now it just moves into one direction, the player cannot control it yet. I wanted to add collision and I was planning to do this by checking if the player's new position is on a wall tile. Therefore as you can see in the following code snippet, I get the tile type of the appropriate tile and if it is not zero (since on that layer there is nothing except the wall tile) it is a collision and the player cannot move further: final Vector2 newPos = charController.move(warrior.getX(), warrior.getY()); if(!collided(newPos)) { warrior.setPosition(newPos.x, newPos.y); warrior.flip(charController.flipX(), charController.flipY()); } [..] private boolean collided(Vector2 newPos) { int row = (int) Math.floor((newPos.x / 32)); int col = (int) Math.floor((newPos.y / 32)); int tileType = tiledMap.layers.get(1).tiles[row][col]; if (tileType == 0) { return false; } return true; } The character only moves one tile with this code: If I reduce the col value by two it two more tiles. I think the problem will be around indexing, but I'm totally confused because the zero in the coordinate system of libGDX is in the bottom left corner of the screen, and I don't know the tiles array's indexing is similair or not. The size of the map is 19x21 tiles and looks like the following (the starting position of the player is marked with blue:

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• Releasing software/Using Continuous Integration - What do most companies seem to use?

  - by Sagar

  I've set up our continuous integration system, and it has been working for about a year now. We have finally reached a point where we want to do releases using the same. Before our CI system, the process(es) that was used was: (Develop) -> Ready for release -> Create a branch -> (Build -> Fix bugs as QA finds them) Loop -> Final build -> Tag (Develop) -> Ready for release -> (build -> fix bugs) Loop -> Tag Our CI setup: 1 server for development (DEV) 1 server for qa/release (QA) The second one has integrated into CI perfectly. I create a branch when the software is ready for release, and the branch never changes thereafter, which means the build is reproduceable without having to change the CI job. Any future development takes place on HEAD, and even maintainence releases get a completely new branch and a completely new job, which remains on the CI system forever, and then some. The first method is harder to adapt. If the branch changes, the build is not reproduceable unless I use the tag to build [jobs on the CI server uses the branch for QA/RELEASE, and HEAD for development builds]. However, if I use the tag to build, I have to create a new CI job to build from the tag (lose changelog on server), or change the existing job (lose original job configuration). I know this sounds complicated, and if required, I will rewrite/edit to explain the situation better. However, my question: [If at all] what process does your company use to release software using continuous integration systems. Is it even done using the CI system, or manually?

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• how to properly implement alpha blending in a complex 3d scene

  - by Gajet

  I know this question might sound a bit easy to answer but It's driving me crazy. There are too many possible situations that a good alpha blending mechanism should handle, and for each Algorithm I can think of there is something missing. these are the methods I've though about so far: first of I though about object sorting by depth, this one simply fails because Objects are not simple shapes, they might have curves and might loop inside each other. so I can't always tell which one is closer to camera. then I thought about sorting triangles but this one also might fail, thought I'm not sure how to implement it there is a rare case that might again cause problem, in which two triangle pass through each other. again no one can tell which one is nearer. the next thing was using depth buffer, at least the main reason we have depth buffer is because of the problems with sorting that I mentioned but now we get another problem. Since objects might be transparent, in a single pixel there might be more than one object visible. So for which Object should I store pixel depth? I then thought maybe I can only store the most front Object depth, and using that determine how should I blend next draw calls at that pixel. But again there was a problem, think about 2 semi transparent planes with a solid plane in middle of them. I was going to render the solid plane at the end, one can see the most distant plane. note that I was going to merge every two planes until there is only one color left for that pixel. Obviously I can use sorting methods too because of the same reasons I've explained above. Finally the only thing I imagine being able to work is to render all objects into different render targets and then sort those layers and display the final output. But this time I don't know how can I implement this algorithm.

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• With Google Analytics, is it possible to check a specific page in Multi-Channel conversion attribution?

  - by Emmett R.

  I'm somewhat new to Google Analytics, and I'm trying to track all conversions that are assisted by a particular landing page, because I don't expect an instant purchase. I have e-commerce tracking set up. Due to the constraints of the associated ad campaign, I can't include the source/medium code in the url when people go to the landing page, and all of my traffic to the landing page is likely to be direct, so I'm not sure how to tell Multi-Channel marketing that it's a significant page. I know how to add events to a page, but I'm still figuring out what they can and cannot do. Would creating a redirect from the landing url to an identical url+source/medium code work? Any advice on how to accomplish this would be greatly appreciated. Tracking the final sale conversion is not the issue. Ecommerce reporting is functioning just fine on the site. I just want to report the landing page as an assist, whenever it shows up in the funnel, and I need to be able to do that across multiple visits.

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• Mixing JavaFX, HTML 5, and Bananas with the NetBeans Platform

  - by Geertjan

  The banana in the image below can be dragged. Whenever the banana is dropped, the current date is added to the viewer: What's interesting is that the banana, and the viewer that contains it, is defined in HTML 5, with the help of a JavaScript and CSS file. The HTML 5 file is embedded within the JavaFX browser, while the JavaFX browser is embedded within a NetBeans TopComponent class. The only really interesting thing is how drop events of the banana, which is defined within JavaScript, are communicated back into the Java class. Here's how, i.e., in the Java class, parse the HTML's DOM tree to locate the node of interest and then set a listener on it. (In this particular case, the event listener adds the current date to the InstanceContent which is in the Lookup.) Here's the crucial bit of code: WebView view = new WebView(); view.setMinSize(widthDouble, heightDouble); view.setPrefSize(widthDouble, heightDouble); final WebEngine webengine = view.getEngine(); URL url = getClass().getResource("home.html"); webengine.load(url.toExternalForm()); webengine.getLoadWorker().stateProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, State oldState, State newState) { if (newState == State.SUCCEEDED) { Document document = (Document) webengine.executeScript("document"); EventTarget banana = (EventTarget) document.getElementById("banana"); banana.addEventListener("click", new MyEventListener(), true); } } }); It seems very weird to me that I need to specify "click" as a string. I actually wanted the drop event, but couldn't figure out what the arbitrary string was for that. Which is exactly why strings suck in this context. Many thanks to Martin Kavuma from the Technical University of Eindhoven, who I met today and who inspired me to go down this interesting trail.

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• Hidden Gems: Accelerating Oracle Data Integrator with SOA, Groovy, SDK, and XML

  - by Alex Kotopoulis

  On the last day of Oracle OpenWorld, we had a final advanced session on getting the most out of Oracle Data Integrator through the use of various advanced techniques. The primary way to improve your ODI processes is to choose the optimal knowledge modules for your load and take advantage of the optimized tools of your database, such as OracleDataPump and similar mechanisms in other databases. Knowledge modules also allow you to customize tasks, allowing you to codify best practices that are consistently applied by all integration developers. ODI SDK is another very powerful means to automate and speed up your integration development process. This allows you to automate Life Cycle Management, code comparison, repetitive code generation and change of your integration projects. The SDK is easily accessible through Java or scripting languages such as Groovy and Jython. Finally, all Oracle Data Integration products provide services that can be integrated into a larger Service Oriented Architecture. This moved data integration from an isolated environment into an agile part of a larger business process environment. All Oracle data integration products can play a part in thisracle GoldenGate can integrate into business event streams by processing JMS queues or publishing new events based on database transactions. Oracle GoldenGate can integrate into business event streams by processing JMS queues or publishing new events based on database transactions. Oracle Data Integrator allows full control of its runtime sessions through web services, so that integration jobs can become part of business processes. Oracle Data Service Integrator provides a data virtualization layer over your distributed sources, allowing unified reading and updating for heterogeneous data without replicating and moving data. Oracle Enterprise Data Quality provides data quality services to cleanse and deduplicate your records through web services.

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• Best way to mask 2D sprites in XNA?

  - by electroflame

  I currently am trying to mask some sprites. Rather than explaining it in words, I've made up some example pictures: The area to mask (in white) Now, the red sprite that needs to be cropped. The final result. Now, I'm aware that in XNA you can do two things to accomplish this: Use the Stencil Buffer. Use a Pixel Shader. I have tried to do a pixel shader, which essentially did this: float4 main(float2 texCoord : TEXCOORD0) : COLOR0 { float4 tex = tex2D(BaseTexture, texCoord); float4 bitMask = tex2D(MaskTexture, texCoord); if (bitMask.a > 0) { return float4(tex.r, tex.g, tex.b, tex.a); } else { return float4(0, 0, 0, 0); } } This seems to crop the images (albeit, not correct once the image starts to move), but my problem is that the images are constantly moving (they aren't static), so this cropping needs to be dynamic. Is there a way I could alter the shader code to take into account it's position? Alternatively, I've read about using the Stencil Buffer, but most of the samples seem to hinge on using a rendertarget, which I really don't want to do. (I'm already using 3 or 4 for the rest of the game, and adding another one on top of it seems overkill) The only tutorial I've found that doesn't use Rendertargets is one from Shawn Hargreaves' blog over here. The issue with that one, though is that it's for XNA 3.1, and doesn't seem to translate well to XNA 4.0. It seems to me that the pixel shader is the way to go, but I'm unsure of how to get the positioning correct. I believe I would have to change my onscreen coordinates (something like 500, 500) to be between 0 and 1 for the shader coordinates. My only problem is trying to work out how to correctly use the transformed coordinates. Thanks in advance for any help!

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• Is individual code ownership important?

  - by Jim Puls

  I'm in the midst of an argument with some coworkers over whether team ownership of the entire codebase is better than individual ownership of components of it. I'm a huge proponent of assigning every member of the team a roughly equal share of the codebase. It lets people take pride in their creation, gives the bug screeners an obvious first place to assign incoming tickets, and helps to alleviate "broken window syndrome". It also concentrates knowledge of specific functionality with one (or two) team members making bug fixes much easier. Most of all, it puts the final say on major decisions with one person who has a lot of input instead of with a committee. I'm not advocating for requiring permission if somebody else wants to change your code; maybe have the code review always be to the owner, sure. Nor am I suggesting building knowledge silos: there should be nothing exclusive about this ownership. But when suggesting this to my coworkers, I got a ton of pushback, certainly much more than I expected. So I ask the community: what are your opinions on working with a team on a large codebase? Is there something I'm missing about vigilantly maintaining collective ownership?

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• The Start of a Blog

  - by dbradley

  So, here's my new blog up and running, who am I and what am I planning to write here?First off - here's a little about me:I'm a recent graduate from university (coming up to a year ago since I finished) studying Software Engineering on a four year course where the third year was an industrial placement. During the industrial placement I went to work for a company called Adfero in a "Technical Consultant" role as well as a junior "Information Systems Developer". Once I completed my placement I went back to complete my final year but also continued in my developer role 2/3 days a week with the company.Working part time while at uni always seems like a great idea until you get half way through the year. For me the problem was not so much having a lack of time, but rather a lack of interest in the course content having got a chance at working on real projects in a live environment. Most people who have been graduated a little while also find this - when looking back at uni work, it seem to be much more trivial from a problem solving point of view which I found to be true and I found key to uni work to actually be your ability to prove though how you talk about something that you comprehensively understand the basics.After completing uni I then returned full time to Adfero purely in the developer role which is where I've now been for almost a year and have now also taken on the title of "Information Systems Architect" where I'm working on some of the more high level design problems within the products.What I'm wanting to share on this blog is some of the interesting things I've learnt myself over the last year, the things they don't teach you in uni and pretty much anything else I find interesting! My personal favorite areas are text indexing, search and particularly good software engineering design - good design combined with good code makes the first step towards a well-written, maintainable piece of software.Hopefully I'll also be able to share a few of the products I've worked on, the mistake I've made and the software problems I've inherited from previous developers and had to heavily re-factor.

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• I'm applying for a position at a startup. To whom should I address my cover letter?

  - by sapphiremirage

  One of the co-founders answered questions about the company when the job was posted, but I feel like I shouldn't assume that he's the one who is in charge of hiring. Since it's relatively new and has a lot of name overlap with other things already on the web, it's hard to find any information about the company online, much less the name of their hiring manager. I'm not even certain that they do have a hiring manager, since I seem to remember that they are just an 8 person team. I've heard that "To whom it may concern" is tacky, and normally I would say something along the lines of "Dear Head of Human Resources", but that clearly doesn't work in this case. Any idea what my salutation should be? Later Edits: Final Version: To Joe Programmer and/or the AwesomeStartup.com hiring team, (+ a few words in first paragraph explaining why I am addressing Joe Programmer) I've already sent the email, so nothing you say here will save me. However, feel free to comment on my decision if you think your words be useful to future generations. Old Version (left here because some people responded to it): To the hiring manager for internships at Awesomestartup.com, Additionally, because so many people made comments about the content of my letter: I did spent several hours writing the cover letter itself and making sure that it was awesome. After spending such a long time working on the important part, I asked this question because I wanted to make sure that it wouldn't get passed over by some human who was having a bad day and decided that my salutation was inappropriate. Not likely when the most likely reader of that email is a programmer type, I know, but I figured that it wouldn't hurt not to be sloppy.

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• Trouble with speed and vectors

  - by Eegabooga

  I'm working on adding bullets to my game. Right now I can shoot bullets in the direction that I would like from a ship by getting the ship's angle: int speed = 5; int dx = -(cos(degreesToRadians(ship.angle)) * speed); // rate of change in the x direction int dy = -(sin(degreesToRadians(ship.angle)) * speed); // rate of change in the y direction bulletPosition.addX(dx); // addX(dx) is simply bulletPosition.x += dx bulletPosition.addY(dy); The ship is pretty much the exact same thing, except I use the += operator: int dx += -(cos(degreesToRadians(angle)) * 0.15) int dy += -(sin(degreesToRadians(angle)) * 0.15); shipPosition.addX(dx); shipPosition.addY(dy); I would like to be able to add the ship's velocity to the bullet's velocity, but I'm a little confused as to how should get the speed from the ship's vector. I thought that adding the ship's dx to the bullet's dx like int dx = -(cos(degreesToRadians(ship.angle)) * speed * dx) would work because I'm adding the rate of change of the ship to the rate of change of the bullet, but that doesn't work. So here's the final question: How can I get the speed of my ship and apply it to my bullet's speed? Thanks in advance for all help :)

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• Disaster Recovery Example

  Previously, I use to work for a small internet company that sells dental plans online. Our primary focus concerning disaster prevention and recovery is on our corporate website and private intranet site. We had a multiphase disaster recovery plan that includes data redundancy, load balancing, and off-site monitoring. Data redundancy is a key aspect of our disaster recovery plan. The first phase of this is to replicate our data to multiple database servers and schedule daily backups of the databases that are stored off site. The next phase is the file replication of data amongst our web servers that are also backed up daily by our collocation. In addition to the files located on the server, files are also stored locally on development machines, and again backed up using version control software. Load balancing is another key aspect of our disaster recovery plan. Load balancing offers many benefits for our system, better performance, load distribution and increased availability. With our servers behind a load balancer our system has the ability to accept multiple requests simultaneously because the load is split between multiple servers. Plus if one server is slow or experiencing a failure the traffic is diverted amongst the other servers connected to the load balancer allowing the server to get back online. The final key to our disaster recovery plan is off-site monitoring that notifies all IT staff of any outages or errors on the main website encountered by the monitor. Messages are sent by email, voicemail, and SMS. According to Disasterrecovery.org, disaster recovery planning is the way companies successfully manage crises with minimal cost and effort and maximum speed compared to others that are forced to make decision out of desperation when disasters occur. In addition Sun Guard stated in 2009 that the first step in disaster recovery planning is to analyze company risks and factor in fixed costs for things like hardware, software, staffing and utilities, as well as indirect costs, such as floor space, power protection, physical and information security, and management. Also availability requirements need to be determined per application and system as well as the strategies for recovery.

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• How to customize web-app (pages and UI) for different customers

  - by demoncodemonkey

  We have an ASP.NET web-application which has become difficult to maintain, and I'm looking for ideas on how to redesign it. It's an employee administration system which can be highly customized for each of our customers. Let me explain how it works now: On the default page we have a menu where a user can select a task, such as Create Employee or View Timesheet. I'll use Create Employee as an example. When a user selects Create Employee from the menu, an ASPX page is loaded which contains a dynamically loaded usercontrol for the selected menuitem, e.g. for Create Employee this would be AddEmployee.ascx If the user clicks Save on the control, it navigates to the default page. Some menuitems involve multiple steps, so if the user clicks Next on a multi-step flow then it will navigate to the next page in the flow, and so on until it reaches the final step, where clicking Save navigates to the default page. Some customers may require an extra step in the Create Employee flow (e.g. SecurityClearance.ascx) but others may not. Different customers may use the same ASCX usercontrol, so in the AddEmployee.OnInit we can customize the fields for that customer, i.e. making certain fields hidden or readonly or mandatory. The following things are customizable per customer: Menu items Steps in each flow (ascx control names) Hidden fields in each ascx Mandatory fields in each ascx Rules relating to each ascx, which allows certain logic to be used in the code for that customer The customizations are held in a huge XML file per customer, which could be 7500 lines long. Is there any framework or rules-engine that we could use to customize our application in this way? How do other applications manage customizations per customer?

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• Relation between developers and clients

  - by guiman

  Hi everyone, i've been facing a situation at work and i would like to share it with you and tell me: Did you had to do it to? Should a developer be in direct contact wit the client? Or there should be an "adapter" guy that translates client needs in pseudo formal requirements understandable to us? I'm currently working in a small company that its taking care of implementing lots of systems, most of them for goverment institutions, in witch it generally means taking software developted 20 years ago and refurbish them so fit up-to-date needs. The clients generally are very used to them and tend to discourage change (they are in their 50s 60s give or take, so not technologie-friendly in general). As you can imagine, dev-team in most cases starts taking care of relation with clients, generating the documentation needed in this cases (CU usually), assisting to weekly meets to see improvements with clients. As for experience, this is a gold mine for me, because gives a nice perspective on all the aspects of software development, but also some problems rise because, if developers come from mars then client are from venus. So there is a fine gap on the vocabulary/experience/capability-to-interpret-needs that generates an noice in the communication, and some times affecting the final product.

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• Connecting / disconnecting DisplayPort causes crash

  - by iGadget

  I wanted to file a bug about this using ubuntu-bug xserver-xorg-video-intel, but the system prompted my to try posting here first. So here goes :-) While the situation in Ubuntu 11.10 was still somewhat workable (see UI freezes when disconnecting DisplayPort), in 12.04 (using Unity 3D) it has gotten worse. The weird part is that during the 12.04 beta's, the situation was actually improving! I was able to successfully connect and disconnect a DisplayPort monitor without the system breaking down on me. But now with 12.04 final (with all updates), it's just plain terrible. When I now connect an external monitor using the DisplayPort connector on my HP ProBook 6550b, it only works sometimes. Most times (but not always!) the screen just goes blank and the system seems to crash (not even CTRL+ALT+F1 works anymore). Only a hard shutdown by keeping the power button pressed for several seconds and then a restart gets me out of this. I suspect the chances of the system crashing become higher as the system's uptime increases, especially when there have been one or more suspend-resume cycles (although I have also experienced this bug once from a cold boot). Disconnecting is roughly the same as with 11.10 (see issue mentioned above), with the difference that if I resume from suspend, I no longer have to do a CTRL+ALT+F1, ALT+F7 cycle to get my screen back. So what more can I try? Or should I just go ahead and file the bug anyway?

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• Should one reject over-scoped projects?

  - by Little Child

  I spoke to my first potential client today and he told me about the requirements of his project - an Android app. He is a well-known designer / photographer in my country and now wants me to "convert the website into an app, custom-tailored". So the requirements, details stripped out, are as follows: eCommerce Aggregating all his content like videos, blogs, tweets, etc. into the app Live streaming any of his studio demos Augmented reality. So that people can see what his painting will look like on their wall before they buy it Taxi Sharing Now, for a freelance project, it seems too over-scoped. I am not saying that I cannot do it. I can. But let me be realistic: There is a steep learning curve when it comes to VR. I am not a tester. I have never white-box tested my own apps. I always black-box test. Since he is a renowned artist, something short of perfect might harm his public image So, I asked him for 2 weeks' worth of time before I give him the final answer. Now knowing whom to consult for advise, I am posting the question here. Although interesting and personally challenging, I am split-minded about accepting a project like this. I will be the only developer for this. Should one reject a project that seems to be over-scoped for one's own abilities?

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• What should you do when presented with a horrible design?

  - by plua

  Our firm makes websites. We also design websites. But sometimes our client brings his/her own design. This is often made by an in-house designer, or it is the same design they used for something else. However, sometimes these designs look awful. And I am talking really unprofessional, unbalanced, uncool. But the client really wants this design. I really do not like working with a design that is so awful. It takes away all pleasure in coding. You code. You check the demo. Works great. Looks awful. It's just not fun. And ultimately the client might be happy, but 1) I do not feel proud of the final product and 2) the community sees you 'develop' ugly websites, which is bad for your image. Anybody experiencing this kind of stuff? What do you recommend? I've been thinking: Blocking these clients. If somebody has an 'own' design, ask to see it first. Then somehow politely decline. Drawback: you lose a client. Create a new design. Have our in-house designers work one something really cool. Drawbacks: client would need to pay for this (without asking for it), or it will be declined and the company loses time = money. And it might come as an insult if you propose a new design out of the blue. THEIR designer won't like it for sure. Put a clear disclaimer at the bottom of the site: Website design by XXXXX, Website development by US. Helps for the community-impact (if people pay attention), but not for the uneasy feeling.

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• How to handle sorting of complex objects?

  - by AedonEtLIRA

  How would one sort a list of objects that have more than one sortable element? Suppose you have a simple object Car and car is a defined as such: class Car { public String make; public String model; public int year; public String color; // ... No methods, just a structure / container } I designed a simple framework that would allow for multiple SortOptions to be provided to a Sorter that would then sort the list. interface ISorter<T> { List<T> sort(List<T> items); void addSortOption(ISortOption<T> option); ISortOption<T>[] getSortOptions(); void setSortOption(ISortOption<T> option); } interface ISortOption<T> { String getLabel(); int compare(T t1, T t2); } Example use class SimpleStringSorter extends MergeSorter<String> { { addSorter(new AlphaSorter()); } private static final class AlphaSorter implements ISortOption<String> { // ... implementation of alpha compare and get label } } The issue with this solution is that it is not easily expandable. If car was to ever receive a new field, say, currentOwner. I would need to add the field, then track down the sorter class file, implement a new sort option class then recompile the application for redistribution. Is there an easier more expandable/practical way to sort data like this?

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• sudoers - simple explanation requested

  - by Redsandro

  Everytime I want to be able to run something that requires me to be a sudoer too many times, I need to google for the formatting of /etc/sudoers to remind me again what exactly is the proper way to write it. Now I see different writing styles in my sudoers file, which is the consequence of different google results over the months. I've also noticed that the second example (below) seems to work in XFCE, but not in Cinnamon (Gnome 3). This could be totally unrelated, but nontheless I'd like to know once and for all, what is the correct grammar of the sudoer line, and what is the difference between the given examples? redsandro ALL=NOPASSWD:/path/to/command redsandro ALL=(ALL) NOPASSWD:/path/to/command redsandro ALL=(ALL:ALL) NOPASSWD:/path/to/command Also, what are all the ALL's for? One user, one command, yet I need to use the ALL keyword up to three times? Am I doing this wrong? Of course, omitting NOPASSWD: makes you enter your password before you are permitted to run the command, but one point of confusion is the usage of = and :, for the final command that is the subject of the line can be prepended by either =, :, , or ), confusing grammar for similar semantics.

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• How are objects modelled in a functional programming language?

  - by Giorgio

  In an answer to this question (written by Pete) there are some considerations about OOP versus FP. In particular, it is suggested that FP languages are not very suitable for modelling (persistent) objects that have an identity and a mutable state. I was wondering if this is true or, in other words, how one would model objects in a functional programming language. From my basic knowledge of Haskell I thought that one could use monads in some way, but I really do not know enough on this topic to come up with a clear answer. So, how are entities with an identity and a mutable persistent state normally modelled in a functional language? EDIT Here are some further details to clarify what I have in mind. Take a typical Java application in which I can (1) read a record from a database table into a Java object, (2) modify the object in different ways, (3) save the modified object to the database. How would this be implemented e.g. in Haskell? I would initially read the record into a record value (defined by a data definition), perform different transformations by applying functions to this initial value (each intermediate value is a new, modified copy of the original record) and then write the final record value to the database. Is this all there is to it? How can I ensure that at each moment in time only one copy of the record is valid / accessible? One does not want to have different immutable values representing different snapshots of the same object to be accessible at the same time.

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