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  • Managed LAMP platform for maximizing availability and global reach, not scalability

    - by user66819
    Assume a Linux/Apache/MySQL/PHP application for a small base of registered users. With small userbase, there are no traffic peaks so the scalability that cloud platforms offer is not imperative. But the system is mission-critical, so availability is the primary goal. Users are also distributed across Asia, Europe, and US, so multiple server locations that minimize users' network hops would be highly desirable. The dream: a managed VPS platform where we would configure a single server (uploading PHP and other files, manipulating database, etc.), and the platform would automatically mirror the server in a handful of key places around the world (say one on each US coast, one in Europe, one in east Asia). File system synchronization and MySQL replication would happen automatically. Core operating system is managed, so we don't need to do full system administration and security, and low-level backups are also done by service provider, though we also do our own backups as well. Couple this with some sort of DNS geo-detection, so users are routed to the nearest operational server... with support for https, of course. Does such a dream exist? If not, what are some approaches to accomplish the same end with minimal time investment and minimal monthly hosting costs?

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  • How to do motion tracking of a object using video

    - by Niroshan
    Could someone direct me to a tutorial or guide me how to track motion of a object moving with 6 DOF. I am planing to use a video stream of a moving toy car. I want to calculate displacement and rotation angle of the toy car. I came across some research papers but couldn't find any libraries to the job. Is there a way to do this using OpenCV or Matlab or some other freely available software? Thank you

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  • convert class object collection to List

    - by prince23
    hi, here i have an return type as class object collection. where Emp is class , having properties like Fname, lname,Age WebApplication1.kumar .Job Emp = objEmp.GetJobInfo2(1); i need to convert the oject collections into List List objEmp = new List(); what is the steps that i need to do here to convert class object to List thanks in advance

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  • Recommend me a good book/source for learning for Web Design

    - by Idlecool
    Hi, While web development/design, I found coding it self is not enough to develop an attractive website so i have urge to learn photoshop.. i want to know what can be the best way to learn photoshop (preferably Photoshop CS4 Extended) mainly for website design. I experienced web tutorials are not enough for effectively learning computer languages, but not sure about photoshop coz it is a different job.. please recommend me a book / web tutorial for learning Photoshop.

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  • How do you unit test the real world?

    - by Kim Sun-wu
    I'm primarily a C++ coder, and thus far, have managed without really writing tests for all of my code. I've decided this is a Bad Idea(tm), after adding new features that subtly broke old features, or, depending on how you wish to look at it, introduced some new "features" of their own. But, unit testing seems to be an extremely brittle mechanism. You can test for something in "perfect" conditions, but you don't get to see how your code performs when stuff breaks. A for instance is a crawler, let's say it crawls a few specific sites, for data X. Do you simply save sample pages, test against those, and hope that the sites never change? This would work fine as regression tests, but, what sort of tests would you write to constantly check those sites live and let you know when the application isn't doing it's job because the site changed something, that now causes your application to crash? Wouldn't you want your test suite to monitor the intent of the code? The above example is a bit contrived, and something I haven't run into (in case you haven't guessed). Let me pick something I have, though. How do you test an application will do its job in the face of a degraded network stack? That is, say you have a moderate amount of packet loss, for one reason or the other, and you have a function DoSomethingOverTheNetwork() which is supposed to degrade gracefully when the stack isn't performing as it's supposed to; but does it? The developer tests it personally by purposely setting up a gateway that drops packets to simulate a bad network when he first writes it. A few months later, someone checks in some code that modifies something subtly, so the degradation isn't detected in time, or, the application doesn't even recognize the degradation, this is never caught, because you can't run real world tests like this using unit tests, can you? Further, how about file corruption? Let's say you're storing a list of servers in a file, and the checksum looks okay, but the data isn't really. You want the code to handle that, you write some code that you think does that. How do you test that it does exactly that for the life of the application? Can you? Hence, brittleness. Unit tests seem to test the code only in perfect conditions(and this is promoted, with mock objects and such), not what they'll face in the wild. Don't get me wrong, I think unit tests are great, but a test suite composed only of them seems to be a smart way to introduce subtle bugs in your code while feeling overconfident about it's reliability. How do I address the above situations? If unit tests aren't the answer, what is? Thanks!

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  • Creating a test database with copied data *and* its own data

    - by Jordan Reiter
    I'd like to create a test database that each day is refreshed with data from the production database. BUT, I'd like to be able to create records in the test database and retain them rather than having them be overwritten. I'm wondering if there is a simple straightforward way to do this. Both databases run on the same server, so apparently that rules out replication? For clarification, here is what I would like to happen: Test database is created with production data I create some test records that I want to keep running on the test server (basically so I can have example records that I can play with) Next day, the database is completely refreshed, but the records I created that day are retained. Records that were untouched that day are replaced with records from the production database. The complication is if a record in the production database is deleted, I want it to be deleted on the test database too, so I do want to get rid of records in the test database that no longer exist in the production database, unless those records were created within the test database. Seems like the only way to do this would be to have some sort of table storing metadata about the records being created? So for example, something like this: CREATE TABLE MetaDataRecords ( id integer not null primary key auto_increment, tablename varchar(100), action char(1), pk varchar(100) ); DELETE FROM testdb.users WHERE NOT EXISTS (SELECT * from proddb.users WHERE proddb.users.id=testdb.users.id) AND NOT EXISTS (SELECT * from testdb.MetaDataRecords WHERE testdb.MetaDataRecords.pk=testdb.users.pk AND testdb.MetaDataRecords.action='C' AND testdb.MetaDataRecords.tablename='users' );

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  • Windows Share permissions

    - by Armando
    I have a SQL/File server that I am replicating a File Share and SQL instance, using ArcServer RHA, to a Replica server. Everything seems to work as far as the replication of the SLQ instance and Share is concerned. When I fail over to the Replica server the DNS Host A record is modified to point to the Replica Server IP Address so if I do an NSLOOKUP on ServerA it then points to the IP Address of ServerB. Ans since the SQL instance is named the same I can still map my ODBC connections to ServerA and I can still make a SQL connection. When I try to do a \ServerA\Share I get an error that says I do not have permissions to the Share. I think this is because it uses keberose authentication and the Share is tied to the actual sever host name. I have tried puting in a CNAME and pointing it to ServerA and Disabling Strict Name Checking on ServerB as well as adding the CNAME to the OptionalNames in the registry but I am still getting the error when I have the ServerA powered off. Is there a way to reset the Authentication of the Share to use the DNS Cname?

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  • installing NUMPY for Mac OSX 10.7. (Lion) for use with Python

    - by user1744871
    I Need to use nltk and numpy with Python. I am a newbie to Python and initially used the python 2.7.3 that came with my mac (currently running OSX 10.7.5). I learned that the apple version of python may not be robust so I downloaded the standard version from python.org. I have downloaded the nltk program for Mac OSX 10.7. This seemed to install fine. I am trying to download and install numpy using the instructions from the scipy website. http://www.scipy.org/Installing_SciPy/Mac_OS_X. I cloned numpy from github but when I tried to build it using the following command $ python setup.py build I received the following error MacOS/Python: can't open file 'setup.py': [Errno 2] No such file or directory I also tried to build it using the scons command $ python setupscons.py scons --jobs=2 and received the following error /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python: can't open file 'setupscons.py': [Errno 2] No such file or directory Can anyone think of a possible workaround?

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  • Converting PDF to PCL5 on Windows?

    - by Hein du Plessis
    In my application, I need to convert PDF docs to PCL5 generic files to send to FTP PCL capable printers. Printing to file would be a last resort, I would prefer a small-footprint command line tool or API that will do the job. I've seen some mention of doing this on Linux using Ghostscript, but I've got no idea how to replicate this on windows. Many thanks

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  • Are there localization tools which spot content strings in xaml/wpf?

    - by Noel Kennedy
    When globalizing a wpf application with static resx classes, it's very easy to miss the odd label or button that has its Content property set to a hard coded string in a particular language, ie English. These should of course be moved off to a {x:Static ...} so they can be localised for each culture. Are there any tools which can spot this and warn you? Built in to VS would be ideal, but I'm thinking that 'style cop' type build tools would do the job as well.

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  • Repository Pattern: SaveOrUpdate() in Entity Framework and L2S

    - by JMSA
    These web articles uses separate Save() and Update() methods in the repository pattern. I am using repository pattern. How can I write a SaveOrUpdate() method in Entity Framework with the help of ObjectContext and in Linq-To-SQL with the help of DataContext? That is, how can I write a single method that shall do both save and update job?

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  • Log4net rollingfile appender skipping every other day in asp.net mvc app

    - by tasty_spider_men
    Hi, I've set up some log4net logging on an asp.net mvc application i've had running for a little over a month now. I've set up rolling file (and smtp) appender on it. The application is hit several thousand times a day - alot of actions are logged. On top of these a number of batch jobs are run as part of the application that also write to the log. Now - as i've been occupied with other work, i've not attended to this application much assuming things to be working based on my test setup. Unfortunately i discover that the rolling file appender on my production server seems to be skipping every other day. Ie i have logs : 10/4/2010, 10/4/2010.1, 10/4/2010.2, 12/4/2010, 12/4/2010.1 , 14/4/2010, 14/4/2010.1 etc. Any idea what could be causing this? It is absolutely impossible that there has no action on these odd days for the lifetime of the application. Cheers

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  • can you have a java career without a CS degree ?

    - by eclipsepain
    What is the best way to prepare for a java career ? Could you study on your own, make a few open source projects or work as a freelancer to build credibility ? OR should I sit through my 3 year CS program. I am in heavy student loan debt from my previous degree....so I'm trying to find the fastest way to find a job, or get paid !

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  • Server 2008 email on Event variables

    - by Jeff Miles
    One of the new features of Server 2008 is the ability to attach a task to a specific event in the event logs. One of the actions available is to send an email through a SMTP server. This is working great, however it would be ideal if in the message body, the Event contents could be placed. I have tried using $eventdescription and %eventdescription%, but those are just shots in the dark. Any amount of googling produces no results. Does anyone know if this is possible? Update: Sparks' suggestion below is a step in the right direction I believe, however that method doesn't seem to work for all values. For example, I can pull the RecordID, Severity and Channel as shown, but I can't use the same method to retreive the EventID, or most importantly the description. Here's the raw XML from one event: [Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"] [System] [Provider Name="DFSR" /] [EventID Qualifiers="16384"]4412[/EventID] [Level]4[/Level] [Task]0[/Task] [Keywords]0x80000000000000[/Keywords] [TimeCreated SystemTime="2009-05-14T18:18:09.000Z" /] [EventRecordID]45692[/EventRecordID] [Channel]DFS Replication[/Channel] [Computer]servername.domain.com[/Computer] [Security /] [/System] [EventData] [Data]9046C3F4-843E-4A53-B941-4B20764072E5[/Data] [Data]D:\departments\Geomatics\Plan Quality\Data Processing\CG3533017 2009-05-13 KT FIXED[/Data] [Data]D:\departments[/Data] [Data]{26D5F604-E603-4F87-8EC3-DE9A945DA8FD}-v927199[/Data] [Data]Departments[/Data] [Data]domain.ca\files\departments[/Data] [Data]B8242CE2-F5EB-47DA-BA5B-1DD2F7EE3AB9[/Data] [Data]DFAA7A54-66CB-4C31-81A0-0F861382C32C[/Data] [Data]CG3533017 2009-05-13-{26D5F604-E603-4F87-8EC3-DE9A945DA8FD}-v927199[/Data] [/EventData] [/Event] I have tried using a ValueQuery for EventData, but it returns no data.

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  • I want to learn a new language!

    - by Alex
    Hi, I'm a college student majoring in computer science. I know java and will be learning C++ the next couple years at school. I want to add another language to my repertoire and have gotten conflicting advice: Ruby, Python, Perl, JavaScript, PHP, AJAX, among others. I was wondering what everyone's opinions were on the relative value of each of these languages in the job market, the ease of learning of each of the languages, and just personal preferences when it comes to the languages mentioned above. Thanks!

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  • what do i need to do now that I want to take programming hobby to next level ?

    - by hohog
    i've always wanted to make games but did not start actively learning programming by myself until 1st year of university. i kept going throughout university learning new languages, showing off things i had made, while neglecting my major in Biology. Anyways, i've ended up with an Economics degree, with a portfolio of SaaS and web apps i had created so i could eat during my final year. So far, I'm getting a few interviews here and there in web programming positions. When I get a logic pretest, I fail miserably. or job requires comp sci degree. I mean I can easily design and code an entire app which I emphasize through my portfolio.... but i dont know why I am so slow at logic puzzles on prescreening interview... So what should I do now ? get certificates in languages ? go back to school and learn CS ? is it too late to get into windows programming jobs than web programming ?

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  • My iphone app gets memory warning and killed at 6.8MB

    - by Pankaj
    My app has a thread that does some time consuming job for more than a minute and the app consumes around 6.8MB of memory. I receive a memory warning after sometime and then it gets killed. There is nothing that I can release, and I am using not even 7MB of memory...driving me crazy...any advice please?

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  • PHP thread pool?

    - by embedded
    I have scheduled a CRON job to run every 4 hours which needs to gather user accounts information. Now I want to speed things up and to split the work between several processes and to use one process to update the MySQL DB with the retrieved data from other processes. In JAVA I know that there is a thread pool which I can dedicate some threads to accomplish some work. how do I do it in PHP? Any advice is welcome. Thank

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  • How to generate changelog: git log since last Hudson build?

    - by takeshin
    I'm using Phing to do post build tasks in Hudson. I want to generate changelog containing all commits since last successful Hudson build. But looks like neither Hudson nor Git plugin for Hudson does not provide %last_build_time% variable. This would be satisfying solution, (but how to get the time?): git log --pretty="%s" --since="%last_build_time%" The only way I see for now is extracting it from the job xml file, but I do not know if it is possible with Phing. How do you generate your change logs?

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  • How to mutibind three properties, to dispatch the last change to all properties?

    - by WPFadvocate
    In WPF, I've three objects exposing the same DependencyProperty (let's say it's an integer). I want all three property values to remain synchronized, i.e. that whenever the int value changes in an object, this value is propagated to the two other objects. I think of multibinding to do the job, but I don't know how to detect which object changed, thus which value should be used and propagated to the other objects.

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  • OpenID Attribute Exchange - should I use it?

    - by Josh
    My website will be using only OpenID for authentication. I'd like to pull user details down via attribute exchange, but attribute exchange seems to have caused a lot of grief for StackOverflow. What is the current state of play in the industry? Does any OpenID provider do a decent job of attribute exchange? Should I just steer away from OpenID attribute exchange altogether? How can I deal with inconsistent support for functionality?

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