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  • API always returns JSONObject or JSONArray Best practices

    - by Michael Laffargue
    I'm making an API that will return data in JSON. I also wanted on client side to make an utility class to call this API. Something like : JSONObject sendGetRequest(Url url); JSONObject sendPostRequest(Url url, HashMap postData); However sometimes the API send back array of object [{id:1},{id:2}] I now got two choices (): Make the method test for JSONArray or JSONObject and send back an Object that I will have to cast in the caller Make a method that returns JSONObject and one for JSONArray (like sendGetRequestAndReturnAsJSONArray) Make the server always send Arrays even for one element Make the server always send Objects wrapping my Array I going for the two last methods since I think it would be a good thing to force the API to send consistent type of data. But what would be the best practice (if one exist). Always send arrays? or always send objects?

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  • My First 5K

    - by Chris Williams
    So… yesterday I registered for my first 5K event. It’s in Eden Prairie this weekend. It’s a pretty major milestone for me, especially since I absolutely hate running with a passion. Still, I have to admit I’m rather excited about it. Given that this is my first event, I have no illusions about winning. My immediate goal is simple… don’t come in last. I’ll let you know how it goes.

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  • Novice developer

    - by Shrikant
    Sir. I'm a student of B.Tech final year from the CSE branch. I'm using Ubuntu since the last 3 years. It gave me a lot of knowledge. So now I want to repay Ubuntu back by developing some apps for Ubuntu, but I don't know which language I should choose: Java, C or C++ or something else. So please, guide me how to start. I have intermediate knowlegde of C, C++ , Java & Linux scripts. So in which language should i start? I don't have any live software development knowledge so explain me everything. Thank you

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  • How do I run Conkeror in Emacs?

    - by Anake
    I have been using emacs for about 3 months, and have been amazed by how much improved my interactions with my computer are. I now use eshell rather than a separate terminal, and the last thing I still need to leave my emacs environment for is for my web browser. I have been reading up on Conkeror, and it seems almost ideal (emacs keybindings, no need to use the mouse etc.) but it runs in a separate window. If it could be run within emacs, it would mean that I would never really have to have interaction with the actual OS, which would be good for someone who is forced to rotate between linux, mac and windows (i.e. me). I understand that it couldn't be run from emacs in -nw mode, but would it be possible (or likely) that Conkeror could be setup to run within an emacs window? Note: - I've tried w3m and didn't really like it

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  • Ubuntu 13.04/13.10 - low graphics mode/black screen after login

    - by Richard Stokes
    Since last week, my Ubuntu 13.04 installation started booting up in low graphics mode out of nowhere. I tried a number of solutions found on this site but to no avail. The other night, I decided to upgrade to 13.10 to see if the issue would be fixed in the process. Since then, the system starts fine, but when I login to my account, I'm just presented with a black screen. I switched to the terminal and did any necessary updates, but to no avail. I don't even know where to start debugging this issue, so I'd appreciate if someone could point me towards the first place to start looking?

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  • Speaking at PASS 2012 Summit in Seattle #sqlpass

    - by Marco Russo (SQLBI)
    I will deliver two sessions at the next PASS Summit 2012: one is title Inside DAX Query Plans and the other is Near Real-Time Analytics with xVelocity (without DirectQuery).These will be two sessions that require a lot of preparation and even if I have already much to say, I still have a long work to do this summer in order to go deeper in several details that I want to investigate for completing these sessions.I already look forward to come back in Seattle!In the meantime, you have to study SSAS Tabular and if you want to get a real jumpstart why not attending one of the next SSAS Tabular Workshop Online? We are working on more dates for this fall, but there are a few dates already scheduled.And, last but not least, the early Rough Cuts edition of our upcoming SSAS Tabular book is finally available here (really near to the final print)!

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  • thunderbird-bin causing CPU (core) lockup (12.04, 64bit, up-to-date)

    - by david6
    I have experienced 2-3 unexplained lockup over last 10 days. Today, I had a random lockup (no mouse, keyboard response, 100% CPU). But, when I finally switched (Ctrl-Alt-F1) to command line (it took several minutes) it told me that thunderbird-bin had locked a CPU. I ran this to resolve: pidof thunderbird-bin sudo kill #### However, after saving other work, I tried restarting Thunderbird. It went to 90%+ CPU, and within 20 seconds it locked again. Once I have more detail I will raise a bug (on Ubuntu Forums). Does anyone have any other suggestions, advice?

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  • Graphic card for parallel programming vs traditional methods

    - by Sambatyon
    With a simple search in amazon one can see that the modern approach for parallel programming is to use your graphic card. However I am still a little bit skeptical about it. My last computer has an 8 core CPU which I need is enough for basic all my parallel needs, if I need more I will probably use MPI through a network using my old machines. All in all, Why and/or when should I use CUDA or another method which uses my graphic card instead of traditional methods like pthreads, java threads, boost threads or the new C++ 11 threads? What about using processes?

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  • Speaking at PASS 2012 Summit in Seattle #sqlpass

    - by Marco Russo (SQLBI)
    I will deliver two sessions at the next PASS Summit 2012: one is title Inside DAX Query Plans and the other is Near Real-Time Analytics with xVelocity (without DirectQuery).These will be two sessions that require a lot of preparation and even if I have already much to say, I still have a long work to do this summer in order to go deeper in several details that I want to investigate for completing these sessions.I already look forward to come back in Seattle!In the meantime, you have to study SSAS Tabular and if you want to get a real jumpstart why not attending one of the next SSAS Tabular Workshop Online? We are working on more dates for this fall, but there are a few dates already scheduled.And, last but not least, the early Rough Cuts edition of our upcoming SSAS Tabular book is finally available here (really near to the final print)!

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  • What does Enable/Disable mean in Bing's URL Normalization feature?

    - by DisgruntledGoat
    I'm in Bing Webmaster Tools, under Index URL Normalization. Many parameters are listed in the table with 3 other columns: Status, Source, Date. The "Source" column says "Webmaster" where I have added parameters, and "Bing" where I assume the parameter has been auto-detected. "Date" is probably the last date it detected the parameter. I've tried searching the help files but I can't find what the Status column means. The top of the page says: This feature allows you to specify query parameters for Bing’s crawler to ignore. But it's not clear whether "Enable" or "Disable" is related to this, and if so what happens in each case. Does anyone know?

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  • Logitech Performance MX Mouse Jumps on OS X Lion (10.7.4)

    - by Adam Thompson
    I have a Logitech MX Revolution wireless mouse that I am trying to use with OS X Lion. Everything is working except for one problem... there is a small, but quite noticeable, jump when the mouse cursor is moved. The problem is mostly prevalent when dragging and dropping files or trying to highlight items. It makes performing any task with the mouse accurately next to impossible. I did quite a bit of looking and found that all kinds of people have had mouse issues with OS X. I've tried all of the following with absolutely no success: Using the official drivers from Logitech (these performed worse than the default mouse drivers in OS X) Using SteerMouse as a third party mouse driver. This worked ever so slightly better than the default driver, but still suffered quite frequently from the skipping problem Cleaning the sensor on the mouse and ensuring it's not the result of the surface that it's being used on. Tested the mouse on a Windows machine. The mouse worked absolutely flawlessly on the other machine. Changed the channel that my wireless router operates on by the off chance my problems were the result of interference. This also had no effect. I can't think of anything else that could possibly interfere with the mouse. I'm am out of ideas on what to try, so I would really appreciate if anyone has any suggestions. I should also mention that an old wired mouse I had laying around worked just fine when I plugged it in. This really isn't the best solution, however, as I really prefer the MX Revolution.

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  • Any tips to learn how to program with severe ADHD?

    - by twinbornJoint
    I have a difficult time trying to learn how to program from straight text-books. Video training seems to work well for me in my past experiences with PHP. I am trying my hardest to stay focussed and push through. Specifically I am looking to start indie game development. Over the last two weeks I have been trying to pick the "right" language and framework to develop with. I started going through Python, but I am not really enjoying the language so far. I am constantly looking through this website to compare this language to that, and keep getting distracted. Aside from all of this, is it possible to become a programmer when you have trouble focussing? Has anyone been through this that can recommend some advice? edit - you guys can check my new question out with detailed information thanks to all of the responses from this thread. http://programmers.stackexchange.com/questions/15916/what-is-the-best-language-and-framework-for-my-situation

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  • Object-based content management system

    - by Adam Maras
    I remember hearing within the last year or two about a content management system either being released or developed that was centralized around product/item information. I'm aware that there are several CMSes that have this capability, but this particular one was built specifically for that task. Also, I remember it winning some sort of award or recognition for upcoming software products. However, I can't for the life of me remember what this CMS was called or who was developing it. Does anyone know what package I'm talking about?

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  • Need a remote desktop to a headless server without logging in first

    - by user17971
    I've been using Linux for many years now but only to run servers. Over the last few days I've been struggling with a technical / configuration issue which I hope someone can help with. I've installed / un-installed many packages but just can't figure out what the "right" way of doing this is. The requirement seems simple Server runs Ubuntu 10.04 with xubuntu and SSH (I do NOT want to connect any screen, keyboard or mouse to the server) I have Windows 7 machine with putty on it and logging in to the server using SSH is fine I want to run an xterminal session on my Windows machine. Amongst the things I've tried is VNU but I can't get it to work because I believe you have to login on the server first. Thanks in advance

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  • Why does nothing work after I randomly changed some file permissions?

    - by Josh B
    Ok so last night i was trying to set permissions to some folders in my File System, since apparently im not an admin on my own computer. And now everything got messed up today and i don't know what to do.. I lost my internet, the icon is not showing in the taskbar anymore. I lost my sound, there is no sound devices listed when i go into the sound menu. I can not log into root anymore, it gives me "sudo: must be setuid root" I can not plug anything in anymore, it will not recognize flash drives or external hard drives. It gives me a Internal Error message everytime i log in It doesn't let me log into the Grub screen anymore on boot up. What did i do? I have a lot of files on here i wish to put on a flash drive but it won't recognize it.

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  • Large, high performance object or key/value store for HTTP serving on Linux

    - by Tommy
    I have a service that serves images to end users at a very high rate using plain HTTP. The images vary between 4 and 64kbytes, and there are 1.300.000.000 of them in total. The dataset is about 30TiB in size and changes (new objects, updates, deletes) make out less than 1% of the requests. The number of requests pr. second vary from 240 to 9000 and is dispersed pretty much all over, with few objects being especially "hot". As of now, these images are files on a ext3 filesystem distributed read only across a large amount of mid range servers. This poses several problems: Using a fileysystem is very inefficient since the metadata size is large, the inode/dentry cache is volatile on linux and some daemons tend to stat()/readdir() it's way through the directory structure, which in my case becomes very expensive. Updating the dataset is very time consuming and requires remounting between set A and B. The only reasonable handling is operating on the block device for backup, copying, etc. What I would like is a deamon that: speaks HTTP (get, put, delete and perhaps update) stores data it in an efficient structure. The index should remain in memory, and considering the amount of objects, the overhead must be small. The software should be able to handle massive connections with slow (if any) time needed to ramp up. Index should be read in memory at startup. Statistics would be nice, but not mandatory. I have experimented a bit with riak, redis, mongodb, kyoto and varnish with persistent storage, but I haven't had the chance to dig in really deep yet.

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  • Behavior tree implementation details

    - by angryInsomniac
    I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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  • Are these GitHub features implemented in BitBucket?

    - by doug
    I recently joined a company that, while using git for version control, uses BitBucket as remote/master + git interface for projects. This is my first exposure to BitBucket. There are a couple of GitHub features I rely heavily on in my daily workflow and I am trying to find their counterpart in BitBucket or else how I can recreate the same functionality if it is not provided out-of-the-box. In particular, in GitHub I rely heavily on tags (which I realize reside in git) to link commits to issues (feature request, bug report, etc.); in addition, given projects specs are often decomposed into milestones, I use the milestone feature in GitHub Issues to track progress towards our project milestones (ie, in GitHub a milestone is comprised of a sequence of issues, and the commit tagged with the last remaining issue under that Milestone, causes that Milestone to be annotated as completed. I suspect this workflow can be recreated using Jira, which my new employer also uses, but before trying that, I want to learn if it's already implemented and I just can't find it.

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  • Google I/O 2012 - Making Good Apps Great: More Advanced Topics for Expert Android Developers

    Google I/O 2012 - Making Good Apps Great: More Advanced Topics for Expert Android Developers Reto Meier In a follow-up to last year's session, I'll demonstrate how to use advanced Android techniques to take a good app and transform it into a polished product, without being a resource hog. Features advanced coding tips and tricks, bandwidth-saving techniques, implementation patterns, exposure to some of the lesser-known API features, and insight into how to minimize battery drain by ensuring your app is a good citizen on the carrier network. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 2193 69 ratings Time: 58:35 More in Science & Technology

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  • Java dev learning Python: what concepts do I need to wrap my head around?

    - by LRE
    I've run through a few tutorials and written some small projects. I'm right in the middle of a small project now infact. All is going well enough thanks in no small part to Uncle Google (who usually points me to Stackoverflow ;-) Several times in the last few days I've found myself wondering "what am I missing?" - I feel that I'm still thinking in Java as I write in Python. This question over at StackOverflow is full of tips about what resources to read up on for learning Python, but I still feel that I'm a Java dev with a dictionary (no pun intended) to translate into Python. What I really want to do is refactor my head to be able to write Pythonic Python instead of Java disguised as Python (not that I want to loose my Java skills). So, the crux of my question is: what concepts does a Java dev really need to learn to think Pythonic? This includes anything that needs to be un-learnt. ps: I consider language syntax to not be particularly relevant to this question.

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  • Community Events in Köln (October) and Copenhagen November #ssas #tabular #powerpivot

    - by Marco Russo (SQLBI)
    Short update about community events in Europe where I will speak.On October 11 I will present DAX in Action in Köln - all details in the PASS local chapter here: http://www.sqlpass.de/Regionen/Deutschland/K%C3%B6lnBonnD%C3%BCsseldorf.aspxI will be speaking at a community event in Copenhagen on November 21, 2012. The session will be Excel 2013 PowerPivot in Action and details about time and location are available here: http://msbip.dk/events/30/msbip-mode-nr-9/I will be in Köln and Copenhagen to teach the SSAS Tabular Workshop. The workshop in Köln is the first in Germany and I look forward to meet new BI developers there.Copenhagen is the second edition after another we delivered this spring. It is a convenient location also for people coming from Malmoe and Göteborg in Sweden. Last event in Copenhagen were conflicting with a large event in Sweden, maybe this time I'll meet more people coming from the other side of the Øresund Bridge!Many other dates and location are available on the SSAS Tabular Workshop website.

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  • dhcpd fails to start

    - by TECHPREACHER
    I recently installed Ubuntu 11.10 I then used apt-get to grab isc-dhcp3. I removed Network-Manager and manually configured my network interface eth0. In addition, I hand edited a dhcpd.conf file and designated eth0 as the listen port in /etc/default/isc-dhcp-server. However, each time I attempt to start dhcpd it fails. When I view the syslog file, the last line is as follows: "Not configured to listen on any interfaces!" My eth0 interface works fine. I can ping addresses inside and outside the network and perform DNS queries. Any help would be greatly appreciated. AJ

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  • What are the pros and cons of a non-fixed-interval update loop?

    - by akonsu
    I am studying various approaches to implementing a game loop and I have found this article. In the article the author implements a loop which, if the processing falls behind in time, skips frame renderings and just updates the game in a loop (the last variant called "Constant Game Speed independent of Variable FPS"). I do not understand why it is acceptable to call update_game() in a loop without making sure the update function is called at a particular interval. I do not see any value in doing this. I would think that in my game I want to be sure the game is updated periodically with a known period. So maybe it is worthwhile to have two threads, one would call update periodically, and the other one would redraw the game, also periodically? Would this be a good and practical approach? Of course I would need to synchronise the threads.

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  • Define outgoing ip address when using ssh

    - by Mark
    I have an ubuntu server machine (12.04) with 4 IP addresses for different websites that require unique ssl certificates. I sometimes ssh out from this box and the box I am going to I have to tell it what IP address I will be coming from. How do I specify which of the 4 ip addresses I want to use as my outgoing IP address? If i do an ifconfig it appears that I am going out as the last ipaddress. I guess you would want to specify either the address or the interface.... Thanks in advance! -Mark

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  • Why is Thunderbird pegging a core at 100%?

    - by david6
    I have experienced 2-3 unexplained lockup over last 10 days. Today, I had a random lockup (no mouse, keyboard response, 100% CPU). But, when I finally switched (Ctrl-Alt-F1) to command line (it took several minutes) it told me that thunderbird-bin had locked a CPU. I ran this to resolve: pidof thunderbird-bin sudo kill #### However, after saving other work, I tried restarting Thunderbird. It went to 90%+ CPU, and within 20 seconds it locked again. Once I have more detail I will raise a bug (on Ubuntu Forums). Does anyone have any other suggestions, advice? UPDATE Thunderbird 13.0.1 is quite stable in safe mode. Still working to resolve ..

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