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  • decouple software components via nameconvention

    - by csteinmueller
    I'm currently evaluating alternatives to refactor a drivermanagement. In my multitier architecture I have Baseclass DAL.Device //my entity Interfaces BL.IDriver //handles the dataprocessing between application and device BL.IDriverCreator //creates an IDriver from a Device BL.IDriverFactory //handles the driver creation requests Every specialization of Device has a corresponding IDriver implementation and a corresponding IDriverCreator implementation. At the moment the mapping is fix via a type check within the business layer / DriverFactory. That means every new driver needs a) changing code within the DriverFactory and b) referencing the new IDriver implementation / assembly. On a customers point of view that means, every new driver, used or not, needs a complex revalidation of their hardware environment, because it's a critical process. My first inspiration was to use a caliburn micro like nameconvention see Caliburn.Micro: Xaml Made Easy BL.RestDriver BL.RestDriverCreator DAL.RestDevice After receiving the RestDevicewithin the IDriverFactory I can load all driver dlls via reflection and do a namesplitting/comparing (extracting the xx from xxDriverCreator and xxDevice) Another idea would be a custom attribute (which also leads to comparing strings). My question: is that a good approach above layer borders? If not, what would be a good approach?

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  • Filter tagged threads in Thunderbird

    - by Let_Me_Be
    I have a big issue with Thunderbird, I need to process a lot of emails coming from request tracking system. Since only few of those apply to me personally, I tag these threads with appropriate tags. The issue now is that I would like to filter out threads, that do apply to me and those that I haven't tagged yet. I'm unable to do this, because new emails keep arriving into the already existing threads, and of course, these new emails don't get the tags. Basically I would need some sort of filtering rule, that would apply not to a specific message, but the master message in the thread. Is there some possibility to create such filters, or is there some other facility, that would allow me to do the same? Tags are great, since they are actually saved into the messages and correctly sync across multiple machines when using IMAP.

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  • One of my VMs went boom using Virtual Box and how it got fixed

    - by Enrique Lima
    I am running an HP Envy 15, 16GB and 500GB (7200 RPM) Hard drive. Had a VM configured from another environment, created the virtual machine config file on Virtual Box, everything seemed ok. Fired it up, and it was  s   l   o   w, it took close to 10 minutes for it to load, and about 5 more to see Windows was in the process of loading before the BSOD.  Thought, maybe, just maybe it will not happen again … oh was I wrong. Frustration had already hit an all time high with this configuration and the number of issues I’ve had. How I did the troubleshooting … The best thing to do (IMO) is to step back, and gather your tools to debug this situation. Tools:  Virtual Box command line tools, Windows Debug. Virtual Box comes with a pretty good set of tools to examine, migrate and overall tasks to deal with VMs. The firs step:  use VBoxManage to prevent the VM from rebooting after the error to get enough time to really dig into the BSOD issue. Command used:   VBoxManage setextradata VMNAME "VBoxInternal/PDM/HaltOnReset" 1 Once this was done, the error reported was an “Inaccessible boot device” coming from a “Stop – 7B” type of error on the BSOD. The issue I had with this, my VM was configured to use a virtual SATA controller, and thought Windows 2008 R2 would handle this fine … again wrong!  Because the integration tools from the other product where wanting to take effect that was throwing everything off. The fix The fix was almost handed to me, edited the configuration for the VM, removed the SATA controller from it, added the virtual hard drive under an IDE controller, boot up and voilà … it works! I was then able to install the Virtual Box guest tools and such, but have decided to favor “keep on working” over “let’s try SATA again”

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  • What maintenance is required for a Postfix setup?

    - by JonLim
    I've taken a look at the setup and configuration process for a Postfix server, planning to use it for just sending emails out from my server. So far, I have these steps: Setup Postfix Configure Postfix Install DKIM Set SPF records Tune for performance Debug Seems rather straightforward. However, I was just wondering: are there any actions I should be taking for periodic maintenance of my Postfix setup? Thanks! EDIT: Also, just curious, how long would this entire setup ideally take? 30 - 60 minutes? More?

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  • Is there a difference in page fault rates between CPU bound and I/O bound processes?

    - by user198864
    I was thinking, should there be any difference in expectation of the page fault rate on CPU-bound vs I/O bound processes? At first I thought maybe we could, since CPU-bound processes would likely be using more memory accesses per time quantum, so I expect it would move from locality to locality faster. At the same time, the CPU-bound process is probably given a larger working set... but this doesn't affect the fault overhead as it hits a new locality IF this wasn't pre-paged in. Is there actually any real difference in the page fault rates or am I just musing about something nonexistent? And if there is, how would it impact a real-world OS like linux?

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  • Software to automate event notifications

    - by user6781
    I maintain a small web site and people can send an email to request information about new events. I would like to automate the process of updating people about new events via email. Is there some easy existing software package to do this? Where I can configure events with a date/description/etc... and have mails get sent automatically? The alternative is to build a MySql database and have some python script in a cron job that does it. I'd like to know if this is a solved problem though. I'm running on a shared host (dreamhost if it matters)

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  • Windows + Jolicloud crash!

    - by SystmHck
    My girlfriend's Acer Aspire One netbook just crashed running Windows XP. It crashes at the boot process, displays the blue screen for a second and then reboots. I also installed Jolicloud through Jolicloud Express but I am not able to boot it either. I suspect it's a virus... When running a Ubuntu live session from a pendrive it seems like the Acer partition is corrupted. In a partition program it says to run chkdsk in Windows to fix it. I have used Ubuntu for a while but I am not an expert so I wanted to ask: How do I restore my NTFS damaged partition?

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  • Looking to Implement/Upgrade Your MDM Solution? OOW Has the Session For You

    - by Mala Narasimharajan
    By Bala Mahalingam  Hurray!  Oracle Open World next week.  Oh my God!  I need to plan my calendar for MDM focused sessions. The implementation/upgrade of Oracle Master Data Management solution is an art & science combined. This year at Open World, we have a dedicated session focused on sharing two great implementation stories of Oracle Customer Hub. Also hear from Oracle on the implementation/upgrade approach and methodology for Oracle Master Data Management and Data Quality applications. Here are some of the questions that you might be thinking around the implementation of Oracle MDM solution. If you are in the process of implementation / upgrade or evaluating the options for implementation of MDM solution and you would like to hear directly from T-Mobile and Sony on their roadmap and implementation experience, then I would highly recommend this session.     Hope to see you at Oracle Open World 2012 and stay in touch via our future blogs. Look here for a list of all the MDM sessions at OpenWorld.

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  • Laser range finder, what language to use? Beginner advice

    - by DrOnline
    I hope this is the right place. I am a programming beginner, and I want to make a laser range finder, and I need advice about how to proceed etc. In a few weeks I will get a lot of dirt cheap 3-5V lasers and some cheap usb webcams. I will point the laser and webcam in parallel, and somehow use trigonometry and programming to determined distance. I have seen online that others made done it this way, I have purposefully not looked at the details too much because I want to develop it on my own, and learn, but I know the general outline. I have a general idea of how to proceed. The program loads in a picture from the webcam, and I dunno how images work really, but I imagine there is a format that is basically an array of RGB values.. is this right? I will load in the red values, and find the most red one. I know the height difference between the laser and the cam. I know the center dot in the image, I know the redmost dot. I'm sure there's some way to figure out some range there. TO THE POINT: 1) Is my reasoning sound thus far, especially in terms of image analysis? I don't need complete solutions, just general points 2) What I need to figure out, is what platform to use. I have an arduino... apparently, I've read it's too weak to process images. Read that online. I know some C I know some Python I have Matlab. Which is the best option? I do not need high sampling rates, I have not decided on whether it should be automated or whether I should make a GUI with a button to press for samples. I will keep it simple and expand I think. I also do not need it to be super accurate, I'm just having fun here. Advice!

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  • Automatic profile load on boot

    - by AnthonyW
    Is there any way to configure a computer to login automatically at bootup and then IMMEDIATELY switch users? The purpose is to trigger the profile loading process for the assumed user so that when they go to login, their profile loads instantaneously. Yet, the immediate user switch means that the login password is still required before any actual use. A few of the attempts I have made require storing the password in plain-text for the system to use. Needless to say that is undesireable. I have been looking for this solution for years; if anyone knows of a better solution to skinning this cat I am all ears. EDIT: tsdiscon command will Lock the workstation.

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  • why in /proc file system have this infomation

    - by liutaihua
    run: lsof|grep delete can find some process open fd, but system dis that it had to delete: mingetty 2031 root txt REG 8,2 15256 49021039 /sbin/mingetty (deleted) I look the /proce filesystem: ls -l /proc/[pid] lrwxrwxrwx 1 root root 0 9? 17 16:12 exe -> /sbin/mingetty (deleted) but actually, the executable(/sbin/mingetty) is normal at /sbin/mingetty path. and some soket like this situation: ls -l /proc/[pid]/fd 82 -> socket:[23716953] but, use the commands: netstat -ae|grep [socket id] can find it. why the OS display this infomation??

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  • High-level description of how experimental C++ features are developed?

    - by Praxeolitic
    Herb Sutter in a video answers a question about the concepts proposal considered for C++11 and from his remarks it sounds like multiple groups offered prototype implementations but all of them left concerns about slow compile times. The comment surprised me because it suggests that, at least in some cases, the prototypes being developed are not just proofs of concept -- they're even expected to perform. All the work that must take has me curious. For mature languages, especially C++, how are experimental language features developed? Is it much different from developing a compiler that implements a standard? Does a developer have a sense of if it will work and perform or even if it ever could? What are the most time consuming parts and are any parts surprisingly easier than one might expect? The question is not what does the C++ standards committee do, but rather the part that comes before. When an experimental implementation for a proposal is being put together and there aren't any completely solidified rules, how is the sausage made? I'm not a professional compiler developer nor do I expect answers with step by step accounts. I'd like a high-level idea of how this would be done or if there are any general patterns at all. I don't know what to expect from the answers but even if there are no rules to the process and the small number of people who do this just cowboy it and then, for stuff that worked out, write up the "official version" as a proposal, that answer would still be informative.

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  • cannot log in to all account except guest after mounting new partition

    - by student
    I really really need help. to do my homework from school, since two days ago, I was installing oracle 11g on my ubuntu. through that process, there was lots of problems also, but searching a lot, in somehow I could go to the next phase installing it. (because it was the first time to install on ubuntu by myself..) but when I was making password for oracle and clicked next, it says there are not enough space for home/oracle folder, So to make another space, I mounted another space after checking Gparted and using Software device management, I mounted it. And when I rebooted it, since then, I cannot log in to my own administrator account and even to oracle account(that I made for oracle 11g on ubuntu ) when I type the passwords for it, it seems to work but it redisplay the first page to log in, without really logging in it.. So I loggined to here as guest account... and even I cannot try gnome console manipulation to restore or fix it.. because it is guest account... I`m struggling for three days and... help me, how do I need to do? and at the time oracle said it needs enough space for its home folder, how I should have done?

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  • MacPorts on mountain lion - cannot install apache2 due to gettext package

    - by jancha
    I have been having problem with installing gettext package from macports. When I am launching /opt/local/bin/port -v install apache2 it checks dependencies, and continues with gettext package installation. But the configure process freezes here: checking for egrep... /usr/bin/grep -E and nothing happens.. can wait hours, nothing changes. I tried to configure, make, make install manually for that package and it went all fine. But, when same configure is launched by ports, it hangs there. Question: 1) How can that be fixed? 2) Maybe I can somehow manually tell ports, that I installed that gettext package manually already? Sorry, if wrong "site" for this question. Felt most proper one.

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  • Client and Server game update speed

    - by user20686
    I am working on a simple two player networked asteroids game using XNA and the Lidgren networking library. For this set up I have a Lidgren server maintaining what I want to be the true state of the game, and the XNA game is the Lidgren client. The client sends key inputs to the server, and the server process the key inputs against game logic, sending back updates. (This seemed like a better idea then sending local positions to the server.) The client also processes the key inputs on its own, so as to not have any visible lag, and then interpolates between the local position and remote position. Based on what I have been reading this is the correct way to smooth out a networked game. The only thing I don’t get is what value to use as the time deltas. Currently every message the server sends it also sends a delta-time update with it, which is time between the last update. The client then saves this delta time to use for its local position updates, so they can be using roughly the same time deltas to calculate position updates. I know the XNA game update gets called 60 times a second, so I set my server to update the game state at the same speed. This will probably only work as long as the game is working on a fixed time step and will probably cause problems if I want to change that in the future. The server sends updates to clients on another thread, which runs at 10 updates per second to cut down on bandwidth. I do not see noticeable lag in movement and over time if no user input is received the local and remote positions converge on each other as they should. I am also not currently calculating for any latency as I am trying to go one step at a time. So my question is should the XNA client be using its current game time to update the local game state and not being using time deltas sent by the server? If I should be using the clients time delta between updates how do I keep it in-line with how fast the server is updating its game state?

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  • trying to set up wireless router, failing

    - by j j
    Hi, I am trying to set up Netgear's wireless-n WNR2000 router, following their oversimplified 5- step process for plugging in wires, and I'm not having any success. It comes down to: once everything is wired and turned on in the correct order, all of the LEDs match the image they give of 'what should be lit up', but their setup disk still doesn't find the router. They have a site to set up the router manually, www.routerlogin.net, which I cannot navigate to, even while wired directly to the router. http://192.168.1.1 doesn't connect to anything, either. The interesting part: i get ping replies from Google's DNS server at 8.8.8.8 while this is set up. but cannot connect to any web site by name, since the router's DNS isn't set up. One thought is that the router and modem both have the same IP address, so it's conflicting, but I'm not sure how I'd resolve that. Any ideas?

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  • Keeping folder of files in sync over 3 machines

    - by Wizzard
    Morning, Got 3 machines that have user content on them, which I need to keep in sync. This is a 3 way sync. Currently I run rsync but we just don't handle deletes. Have looked at something like gluster, but that seems a little over the top Any other software out there to do a 3 way sync, or a good network file system...? There is for web servers so we don't want a slow / IO hungry process. 3 servers... user content could be added to 1 and needs to be moved to other two.

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  • How do I make a Live USB without destroying my Windows computer?

    - by user71089
    Unlike every other post I have read, let me begin by saying that I am TERRIFIED of destroying my Windows 7 home system in the attempt of making a bootable Ubuntu Thumb Drive. I very specifically DO NOT want to attempt configuring a dual boot system. What I am seeking is a portable operating system on a thumb drive, through which I can run my COREL software via VirtualBox-4.1.16-78094-Win. I want to be able to use my own software on my work computer without any worries about screwing up the host system anywhere I go. Supposedly, I just made a bootable Thumb drive, having successfully loaded the ISO for ubuntu-12.04-desktop-i386 using Pendrivelinux's Universal-USB-Installer-1.9.0.1 However, all that I get is a Thumb Drive that wants to install Unbutu onto my PC's HDD. I am not finding any clear path to this end in the posts I am reading. Like it or not, Windows is a fact of life for me. The goal is to be able to use my software on my work PC without doing anything intrusive that will cost me my job. If I have a meltdown on my PC at home trying to make this happen, it will be nearly as bad. Is this even Do-Able? Can the process be made clear? Thank You, Ubuntu World ...!

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  • Cannot run gnome-session

    - by Brian
    I'm having issues running an X Windows session on a RHEL5 64-bit server - whenever I execute the command "gnome-session &", the process goes into the background but nothing happens. I have Exceed installed on my Windows machine which is running when I try to start the gnome-session. I've tried just starting firefox by itself instead of the whole gnome session, but it doesn't work either. Any suggestions? BTW, here's the error message I get when I try to start firefox: firefox: Fatal IO error 104 (Connection reset by peer) on X server localhost:10.0.

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  • WINAPI window management question

    - by gekod
    I'm learning to develop windows applications using WINAPI and plain C. Now I got a bit confused with all those handles and would like to ask if you guys could teach me some good practices to structure and handle controls and windows. Here's where I get confused: Using the IDs declared in the resources for each object, we can get their handles using GetDlgItem(). Now what if we don't know their parent, which is needed by this function. One example: We have the main window created at launch. Then we register two new window classes and create a window for each new class and we create a message function for each too. Now if inside one of the children windows I create a button and inside the other child window I create a text label. Now when we click the button inside of child window A the label in child window B shall be modified to whatever. The WM_COMMAND for the button is interpreted inside the message loop for child window A. Now what would be the best and more elegant way to access the text label inside the child window B? I am in the process of learning the WINAPI and just want to learn it right from the start instead of producing Hacked code that someday becomes unreadable and to later have to adapt to a new way of programing.

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  • Adding custom script on ESXi 5.0

    - by Quzar
    I have an ESXi server that I would like to have run a custom script on every boot that contains esxcli and other commands. I have tried adding the script into init.d and creating an rc.local.d folder with a script, but the etc folder gets rebuilt on startup. I've also tried modifying state.tgz and local.tgz in the /bootbank folder in order to force these files to appear, but that does not seem to work either. Is there any way I can run custom commands on boot? Note: I've tried the advice here ESXi boot process / state storage to no avail. Seems the system was changed between 4.1 and 5.0

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  • Does Google Chrome officially work on Windows 7 64-Bit Yet?

    - by Nick Josevski
    As soon as I jumped onto one of the beta releases for Windows 7, I tried to install Google Chrome. Being on a 64-bit installation it came up with a 'non-supported OS' or some error (can't remember). Having a look around at the time I saw lots of posts/tips about just appending --in-process-plugins to the shortcut for chrome, after trying this and still not having luck, I found more posts including what seemed ones from the Chrome developers saying this was not wise and exposed a security risk. So does anyone have a well sourced answer, as to what's holding up Win 7 64-bit support in Chrome, or better yet an "official" answer to say that it is supported in Win7 x64 RTM and works well now...

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  • Circumventing a manual HTML login page for "unclassified" websites (automation purposes, credentials

    - by auramo
    The IT department just made my life a little bit harder again: they introduced a manual HTML login page for all websites they have not "classified". This means that all the applications which try to access unclassified websites for e.g. downloading plugins do not work. Examples: Eclipse plugin installation, Maven builds etc. What would be the easiest workaround for this? The best I've come up with is try to extend/customize Ruby's httpproxy.rb that comes with Webrick. I would automate the manual login process whenever that login response page is detected. This sounds quite painful, and I think there might/should be simpler options?

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  • ALT+TAB doesn't work properly in Windows 8.1

    - by Marco1
    Holding ALT+TAB will activate the flip 2D to switch from a window to another. The problem is that this function remains active for a very short time and I'm not able to select the window I want in the foreground. I also noticed that when I put the cursor on an icon on the taskbar, the live preview thumbnail disappears quickly. With a safe mode restart the problem is no longer there, all is fine! With a clean install of Windows 8.1(no driver and applications installed) the problem is here again; obviously disappears with a safe mode restart also in this situation. What's the problem? A Windows process or service?

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  • Are you able to specify a the profile you want to use in pfexec?

    - by jigjig
    Are you able to specify which profile you want to use for a given user when using pfexec who has been assigned multiple profiles? One example for this use is so that we can execute a command as a different user within the same process. In exec_attr, you are able to specify the uid/gid that will be used to execute a particular command as in the following example entry: Name Service Security:suser:cmd:::/usr/sbin/rpc.nsid:uid=0;gid=0 The above profile will use the super user (uid=0) to execute the rpc.nsid command. In user_attr, you can specify multiple profiles as below: testuser::::type=normal;profiles=Name Service Security,Object Access Management Can you then specify directly to use the Object Access Management profile to pfexec?

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