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  • Version hash to solve Event Sourcing problems

    - by SystematicFrank
    The basic examples I have seen about Event Sourcing do not deal with out of order events, clock offsets in different systems and late events from system partitions. I am wondering if more polished Event Sourcing implementations rely on a version stamp of modified objects? For example, assuming that the system is rendering the entity Client with version id ABCD1234. If the user modifies the entity, the system will create an event with the modified fields AND the version id reference to which version it applies. Later the event responder would detect out of order events and merge them.

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  • Headset undetected when plugged in

    - by tough
    I have recently installed Ubuntu 12.04 in my machine which was running windows 7. I have been trying to configure the audio to work exactly as it used to work in Windows but never been able to do so. I have followed this link exactly. I am still not getting the required configuration. aslamixer command shows me with 5 adjustable controls as shown below Master "adjustable" Speaker "adjustable" PCM "adjustable" Front "adjustable" AND Beep "adjustable" Mic Jack Mic In or Lin In S/PDIF OO "in a box" S/PDIF D OO "in a box" S/PDIF P DIGITAL or Analog M It does not detect the headset jack when plugged in. I here mean to say that the sound form the speakers does not go off when I plug in my headset jack. How can I make this working. Some other googling also did not help. I am on Hp Pavilion DV7 machine. The chip is IDT 92HD75B3X5 and the card is HDA ATI SB.

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  • Logitech m510 mouse not working on 12.04 64bit

    - by Alonso
    When I run lsusb, this shows up: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver I have followed and done all of the stuff in: http://askubuntu.com/questions/154963/ubuntu-cannot-detect-my-logitech-wireless-m510-mouse Yet my mouse still fails to work. When trying to install HIDpoint, this appears after entering Y: libpng does not exist libtiff does not exist Gathering System information and generating a log Launching HIDPoint Installer ./hidpointsetup: error while loading shared libraries: libpng.so.3: cannot open shared object file: No such file or directory What can I do to fix this?

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  • vector collision on polygon in 3d space detection/testing?

    - by LRFLEW
    In the 3d fps in java I'm working on, I need a bullet to be fired and to tell if it hit someone. All visual objects in the game are defined through OpenGL, so the object it can be colliding with can be any drawable polygon (although they will most likely be triangles and rectangles anyways). The bullet is not an object, but will be treated as a vector that instantaneously moves all the way across the map (like the snipper riffle in Halo). What's the best way to detect/test collisions with the polygon and the vector. I have access to OpenCL, however I have absolutely no experience with it. I am very early in the developmental stage, so if you think there's a better way of going about this, feel free to tell me (I barley have a player model to collide with anyways, so I'm flexible with it). Thanks

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  • have a missing file, and cant run ubuntu upon start up, and hasnt the flash drive i used didnt work either, any help?

    - by trent
    when I first downloaded Ubuntu to install it, it downloaded quick and caused no problems to my laptop. but then when it came time to install it as one of my operating systems, it wouldn't run because it said a file was missing or damaged. so then I uninstalled it and re-installed it but I still had that same problem. so I tried a flash-drive version but that didn't work either because it wouldn't boot from that, nor would it detect my flash drive, (in this case, an old 4 GB mp3 player). any help or tips and ideas would be great, I just need a decent operating system because windows is getting to be terrible at the moment, just note I wanna run Ubuntu along side windows 8.1

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  • Job Search Engine Url Structure Issue [closed]

    - by Justin
    Possible Duplicate: What is the best stucture of SEO friendly URL? I am working on a job board, and i'm trying to figure out a good design for URL structure. Some things that I have found through research: 100 - 150 Chars long is ideal 3-5 words in your url, according to Matt Cutts Use .htaccess to force clean urls Do not duplicate data (important) Clean and precise, describing the content Use hyphens On the homepage, I try to detect the users location based on IP, but this isn't always accurate, and not always reliable. So until they put in their city/location, I can't always use this structure but this is potentially work-able. For Searching, a form post to a results page: domain.com/jobs/[city]/[search] ie: domain.com/jobs/toronto/sales manager/ OR domain.com/search/jobs/toronto/sales manager/ or do I remove the word JOBS and just use Search. I trying to keep good search terms in the URL, but also keep it clean and concise. Can someone give me some feedback and thoughts to 'why'...

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  • Thinkpad T530 with Optimus and Docking Station

    - by Vic Boudolf
    I have a Lenovo Thinkpad T530 with Optimus video, which is not supported on 12.04.1. I don't normally need the discrete (nVidia) graphics, so I turn it off in the BIOS settings to achieve longer battery life (and so that the screen dimmer will work), but when placed in the docking station, the integrated (Intel) graphics don't power the HDMI ports. (The VGA port does work, but I want to focus on the HDMI.) This means I have to change the BIOS settings constantly. Is there any way to have the system detect the docking station and power up/enable the discrete graphics accordingly? I don't need to do it on the fly. Just at startup. This post suggests that bumblebee can turn the discrete graphics on and off for specific applications, but I just want to turn it on or off. [2 suggests that vga_switcheroo will not work with nVidia Optimus.

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  • Wireless not working with an Atheros AR9285

    - by Neeraj
    I recently installed Ubuntu 12.04 and found my wireless card is not detected by OS. I tired to detect it by network manager but still it is not get output of the required command: toor@Linux:~$ sudo lshw -class network *-network description: Ethernet interface product: AR8131 Gigabit Ethernet vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:03:00.0 logical name: eth0 version: c0 serial: f0:de:f1:9e:22:4d size: 100Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI duplex=full firmware=N/A ip=124.123.227.84 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:44 memory:f2400000-f243ffff ioport:2000(size=128) *-network UNCLAIMED description: Network controller product: AR9285 Wireless Network Adapter (PCI-Express) vendor: Atheros Communications Inc. physical id: 0 bus info: pci@0000:04:00.0 version: 01 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:f2500000-f250ffff and toor@Linux:~$ rfkill list all 0: ideapad_wlan: Wireless LAN Soft blocked: yes Hard blocked: no 1: ideapad_bluetooth: Bluetooth Soft blocked: yes Hard blocked: no Please let me know what more info is required to resolve it.

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  • How do I dynamically reload content files?

    - by Kikaimaru
    Is there a relatively simple way to dynamically reload content files, such as effect files? I know I can do the following: Detect change of file Run content pipeline to rebuild that specific file Unload ALL content that was loaded Load all content And use double references to reference content files. The problem is with step 3 (and step 2 isn't that nice either). I need to unload everything because if I have model Hero.x which references Model.fx effect, and I change the Model.fx file, I need to reload the Hero.x file which will then call LoadExternalReference on Model.fx. Has someone managed to make this work without rewriting the whole ContentManager (and every ContentReader) and tracking calls to LoadExternalReference?

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  • simple collision detection

    - by Rob
    Imagine 2 squares sitting side by side, both level with the ground: http://img19.imageshack.us/img19/8085/sqaures2.jpg A simple way to detect if one is hitting the other is to compare the location of each side. They are touching if ALL of the following are NOT true: The right square's left side is to the right of the left square's right side. The right square's right side is to the left of the left square's left side. The right square's bottom side is above the left square's top side. The right square's top side is below the left square's bottom side. If any of those are true, the squares are not touching. If all of those are false, the squares are touching. But consider a case like this, where one square is at a 45 degree angle: http://img189.imageshack.us/img189/4236/squaresb.jpg Is there an equally simple way to determine if those squares are touching?

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  • Force full-screen game to one monitor?

    - by Joachim Pileborg
    I have two monitors, one 1920x1200 and the other 1920x1080, and in 10.10 they were "separate". As in when I opened the display preferences they were shown as separate screens. Since installing (from scratch) 11.04 I instead have one giant 3840x1200 screen spread over the two monitors. Not a problem per se, except when I want to play full-screen games! When playing games I want them to be on the primary (1920x1200) monitor, but since the game only detects one screen I cant do that, even if I lower the resolution in-game. I have a nVidia GTS 250 card, using nvidia-current driver (version 270.41.06), even though "Additional Drivers" reports the driver is "activated but not currently in use". Is there a way to force the game to use only one of the monitors? Or make the game detect both monitors?

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  • Cocos2d update leaking memory

    - by Andrey Chernukha
    I have a weird issue - my app is leaking memory on device only, not on a simulator. It is leaking if i schedule update method anywhere, on any scene. It is leaking despite update method is empty, there's nothing inside it except NSLog. How can it be? I have even scheduled update on the very first scene where it seems there's nothing to leak, and scheduled another empty and it's leaking or not leaking but allocating something, the result is the same - the volume of the memory consumed is increasing and my app is crashing soon. I can detect the leakage via using Instruments-Memory-Activity Monitor or with help of following function: void report_memory(void) { struct task_basic_info info; mach_msg_type_number_t size = sizeof(info); kern_return_t kerr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &size); if( kerr == KERN_SUCCESS ) { NSLog(@"Memory in use (in bytes): %u", info.resident_size); } else { NSLog(@"Error with task_info(): %s", mach_error_string(kerr)); } } Can anyone explain me what's going on?

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  • Dual Boot Ubuntu and Windows 7: BOOTMGR is missing when I tried to boot in Windows

    - by Simon Polak
    So, I don't know what exactly how I managed to delete the MBR record on windows partition. But let me explain what I did next, I ran the ubuntu boot repair tool and now Windows is not even listed in my grub loader. So I went and booted with windows cd and choose repair. Then I ran ubuntu boot repair again via live cd. Here is the log http://paste.ubuntu.com/1426181/. Still no luck. Looks like osprobe can't detect windows on my /dev/sda2 partition. Any clues ? Here is how my partitions look like: Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x525400d1 Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 206848 509620669 254706911 7 HPFS/NTFS/exFAT /dev/sda3 509622270 976773119 233575425 5 Extended /dev/sda5 509622272 957757439 224067584 83 Linux /dev/sda6 957759488 976773119 9506816 82 Linux swap / Solaris

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  • Uniquely identify a mobile device

    - by Sahil Malik
    SharePoint, WCF and Azure Trainings: more information Sometimes you need to identify every device your app is installed on uniquely. This is for instance important where you have per-device licensing restrictions. For Win8 store apps, You can use ASHWID (Application Specific Hardware Identifier). ASHWID will be different app to app and device to device. Any hardware changes to the device will cause the unique id to change. You can also detect minor change vs. major change to build custom level of tolerance in what is considered a change. For instance, ejecting a USB stick is a minor change. The below code snippet shows you how to get the unique device id, Read full article ....

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  • Boot-Repair after messing up NTFS partition

    - by QuietThud
    I posted this question explaining what happened after I tried to create a new swap partition on a Win/Ubuntu dual-boot machine. I have since created a live-boot USB and installed Boot-Repair. I had it "recommend repairs", after which it tried repairing the wubi filesystems, which as far as I'm aware was not necessary. I'm not sure where to go from here; I don't care very much about backing up my files, I just want to be able to boot the machine. In the Advanced Options the "Repair Windows boot files" box is uncheckable both GRUB tabs are unclickable (I do have GRUB installed) Here is my Pastebinit with the details from the Boot-Repair. Please be as explicit as possible, as I am proving to be disproportionately bad at this type of task. Thank you! P.S. I keep seeing: cryptsetup: WARNING: failed to detect canonical device of overlayfs cryptsetup: WARNING: could not determine root device from /etc/fstab TestDisk: GPARTED:

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  • Second display is rotated

    - by pram
    I've just updated to Ubuntu 12.10 last night. When I was at the office, I connected my laptop with a projector. Although it can detect the projector, it incorrectly set the projector portrait. Also, if I click the Rotation dropdown, it has no Normal option. It only offered Anticlockwise and Clockwise options. Ofcourse the projector would display my desktop 90 degrees clockwise/anticlockwise. I've just test my laptop again with an LCD monitor, and it happened again. Below is my screenshot for display settings. My display adapter is Intel GMA 950. How to fix this problem?

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  • Authentication for users on a Single Page App?

    - by John H
    I have developed a single page app prototype that is using Backbone on the front end and going to consume from a thin RESTful API on the server for it's data. Coming from heavy server side application development (php and python), I have really enjoyed the new different design approach with a thick client side MVC but am confused on how best to restrict the app to authenticated users who log in. I prefer to have the app itself behind a login and would also like to implement other types of logins eventually (openid, fb connect, etc) in addition to the site's native login. I am unclear how this is done and have been searching - but unsuccessful in finding information that made it clear to me. In the big picture, what is the current best practice for registering users and requiring them to login to use your single page app? Once a user is logged in, how are the api requests authenticated? Can I store a session but how do I detect for this session in the API calls? Any answers to this would be much appreciated!

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  • Elantech trackpad being identified as a logitech wheel mouse.

    - by Nathan Cox
    I recently purchased a Samsung RF510 laptop computer, which I absolutely love. However, upon installing Ubuntu 10.10 onto it I couldn't get the trackpad to function properly. It worked as a basic mouse (point and click) but had no functionality for edge scrolling or any of the multitouch settings the trackpad is capable of. After doing a lot of research I discovered the reason is a known issue where the Ubuntu kernel will improperly detect an Elantech trackpad as a logitech PS/2 wheel mouse, and as such will gain none of the functionality that seems to be coded for synaptics trackpads. The question I have is: does anyone know a way to get this working properly? This is my first time trying to run Ubuntu on a laptop (actually, it's my first laptop in the last 12 years) and I'm finding the experience to be intolerable without the basic scrolling/zooming/etc I've been used to using for as long as I can remember.

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  • How to recognize my performance plateau?

    - by Dat Chu
    Performance plateau happens right after one becomes "adequately" proficient at a certain task. e.g. You learn a new language/framework/technology. You become better progressively. Then all of the sudden you realize that you have spent quite some time on this technology and you are not getting better at it. As a programmer who is conscious about my performance/knowledge/skill, how do I detect when I am in a performance plateau? What can I do to jump out of it (and keep going upward)?

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  • Why can't mythtv backend see my HDHomeRun tuner?

    - by Jeff
    Ran a fresh install of Mythbuntu 12.04.1 32 bit. Went through the backend setup and was able to see my HDHomeRun Prime (HDHR3) device, scan, and detect channels. Cannot get to live TV on frontend. Backend log seems to indicate it's not detecting my tuner, even though I configured it in the setup. Sep 8 15:03:33 Dimension-8300 mythbackend[1668]: E TVRecEvent dtvmultiplex.cpp:325 (ParseTuningParams) DTVMux: ParseTuningParams -- Unknown tuner type = 0x2000 Sep 8 15:03:33 Dimension-8300 mythbackend[1668]: E TVRecEvent dtvchannel.cpp:308 (SetChannelByString) DTVChan(192.168.1.12-0): SetChannelByString(3_1): Failed to initialize multiplex options Sep 8 15:03:33 Dimension-8300 mythbackend[1668]: E TVRecEvent tv_rec.cpp:3681 (TuningFrequency) TVRec(1): Failed to set channel to 3_1. Reverting to kState_None

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  • How to debug a server that crashes once in a few days?

    - by Nir
    One of my servers crashes once in a few days. It does low traffic static web serving + low trafic dynamic web serving (PHP, local MYSQL with small data, APC, MEMCACHE) + some background jobs like XML file processing. The only clue I have is that a few hours before the server dies it starts swapping (see screenshot http://awesomescreenshot.com/075xmd24 ) The server has a lot of free memory. Server details: Ubuntu 11.10 oneiric i386 scalarizr (0.7.185) python 2.7.2, chef 0.10.8, mysql 5.1.58, apache 2.2.20, php 5.3.6, memcached 1.4.7 Amazon EC2 (us-west-1) How can I detect the reason for the server crashes ? When it crashes its no longer accessible from the outside world.

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  • Ubuntu 12.04 LTS 64 bit. Logitech m510 mouse not working!

    - by Alonso
    When I run lsusb, this shows up: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver I have followed and done all of the stuff in: Ubuntu cannot detect my Logitech Wireless m510 mouse? Yet my mouse still fails to work!!! When trying to install HIDpoint this appears after entering Y: libpng does not exist libtiff does not exist Gathering System information and generating a log Launching HIDPoint Installer ./hidpointsetup: error while loading shared libraries: libpng.so.3: cannot open shared object file: No such file or directory What can I do to fix this?

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  • What issues carry the highest risk in a software project?

    - by Mehrdad
    Clearly, software projects are different from other industries in terms of many things like for instance, quality assurance, project progress measurement, and many other things. Unique characteristics of software projects also makes the risk management process unique. Lots of issues in a project might lead it to unacceptable delay or failure to deliver business value. They might even make a complete disaster in the project. What are the deadliest risk factors in a software project? How to analyze, prevent and handle them? Particularly, I'm interested in the issues that you can detect from the beginning and you should keep an eye on (for example, you might be told about a third-party API that the current application uses and lacks documentation). Please share your experiences if they are relevant.

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  • From where does the game engines add location of an object?

    - by Player
    I have started making my first game( a pong game )with ruby (Gosu). I'm trying to detect the collision of two images using their location by comparing the location of the object (a ball) to another one(a player). For example: if (@player.x - @ball.x).abs <=184 && (@player.y - @ball.y).abs <= 40 @ball.vx = [email protected] @ball.vy = [email protected] But my problem is that with these numbers, the ball collides near the player sometimes, even though the dimensions of the player are correct. So my question is from where does the x values start to count? Is it from the center of gravity of the image or from the beginning of the image? (i.e When you add the image on a specific x,y,z what are these values compared to the image?

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  • Apress Books - 3 - Pro ASP.NET 4 CMS (ISBN 987-1-4302-2712-0) - Final comments

    - by TATWORTH
    This book is more than just  a book about an ASP.NET CMS system -  it has much practical advice and examples for the Dot Net web developer. I liked the use of JQuery to detect that JavaScript was not enabled. One chapter was about MemCached - this one chapter could justify the price of the book if you run a server farm and need to improve performance. Some links to get you started are: Windows Memcache at http://code.jellycan.com/memcached/ Dot Net Access Library at http://sourceforge.net/projects/memcacheddotnet/ The chapters on scripting, performance analysis and search engne optimisation all provide excellent examples. This certainly is a book that should be part of every Dot Net Web Development team library. Congratulations to the author and to Apress for publishing this book!

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