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• Robust and fast checksum algorithm?

  - by bene

  Which checksum algorithm can you recommend in the following use case? I want to generate checksums of small JPEG files (~8 kB each) to check if the content changed. Using the filesystem's date modified is unfortunately not an option. The checksum need not be cryptographically strong but it should robustly indicate changes of any size. The second criterion is speed since it should be possible to process at least hundreds of images per second (on a modern CPU). The calculation will be done on a server with several clients. The clients send the images over Gigabit TCP to the server. So there's no disk I/O as bottleneck.

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• Entity Relationship diagram - Composition

  - by GigaPr

  Hi, I am implementing a small database(university Project) and i am facing the following problem. I created a class diagram where i have a class Train {Id, Name, Details} And a class RollingStock which is than generalized in Locomotive and FreightWagon. A train is Composed by multiple RollingStock at a certain time(on different days the rolling stock will compose a different train). I represented the relationship train - rolling stock as a diamond filled (UML) but still I have a many to many relationship between the two tables. so i guess i have to create an additional table to solve the many to many relationship train_RollingStock. but how do i represent the Composition? Can i still use the filled diamond? If yes on which side? Thanks

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• How to set access-control-allow-origin in webrick under rails?

  - by brad

  I have written a small rails app to serve up content to another site via xmlhttprequests that will be operating from another domain (it will not be possible to get them running on the same server). I understand I will need to set access-control-allow-origin on my rails server to allow the requesting web page to access this material. It seems fairly well documented how to do this with Apache and this is probably the server I will use once I deploy the site. While I am developing though I hope to just use webrick as I am used to doing with rails. Is there a way of configuring webrick to provide the appropriate http header within rails?

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• MSSQL2008: DTC Transaction - Internal abort

  - by Teutales

  Hi all, I write a small own replication - a trigger which fires an DTC INSERT to another server (one reason for my own "replication": while trigger is running it calculates some data, another: it works from an express version to an express version). When I do the initial insert from the same Host with the windows authentification it works fine. But there is a webserver on another host, which uses the sqlserver login (for testing sa). When this Host do the initial insert I get a Internal abort after the entlisting and creating phase in the DTCTransaction EventClass (Profiler). The magic is: When I first fire it from the same Host with the windows authentification, I can fire it from the webserver and it works fine. But I just have to wait some minutes and it won't work. Where is my error in reasoning... Thanks! Greetz Teutales Here is my initial server script: EXEC master.dbo.sp_addlinkedserver @server = @Servername, @srvproduct=N'SQL Server' EXEC master.dbo.sp_addlinkedsrvlogin @rmtsrvname = @Servername, @locallogin = NULL , @useself = N'False', @rmtuser = @Serverlogin, @rmtpassword = @Serverpwd

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• VS 2008 and SQL 2008 Express

  - by Serge

  Hi, I am trying to write a small app to connect and manipulate some data on an SQL 2008 Express database. The database is on my local machine but I can see it on the network. I am trying to use LINQ to SQL in my app. I am trying to connect to the database so I can add database model to use with LINQ but the problem is I can not see any databases inside the SQL Server, which is on my machine. I tried using Windows Auth and also tried SQL Server Auth with no luck. Can someone please assist me? What am I missing?

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• How to edit a link within a contentEditable div

  - by Travis

  Does anyone have any suggestions on how to edit an link in a contentEditable div? It would be ideal once the link is either clicked with mouse, or the cursor hits the link, that the a small prompt would pop up and allow the user to change the href property of the link. The prompt isn't the issue, but how is it possible to detect the link has been either clicked or that the cursor has arrived at the link? onfocus doesn't seem to work in a contentEditable div on Firefox & Safari. Any ideas?

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• Jersey, Spring, Tomcat and Security Annotations

  - by jr

  I need to secure a simple jersey RESTful API in a Tomcat 6.0.24 container. I'd like to keep the authentication with Basic Authentication using the tomcat-users.xml file to define the users and roles (this is for now, like I said its small). Now, for authorization I'd like to be able to use the JSR 250 annotations like @RolesAllowed, @PermitAll, @DenyAll, etc. I cannot for the life of me figure out how to wire this all up together. I really don't want to go spring-security route, since I need something very simple at the current time. Can someone point me in the right direction.

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• Using Tweepy API behind proxy

  - by user1505819

  I have a using Tweepy, a python wrapper for Twitter.I am writing a small GUI application in Python which updates my twitter account. Currently, I am just testing if the I can get connected to Twitter, hence used test() call. I am behind Squid Proxy server.What changes should I make to snippet so that I should get my work done. Setting http_proxy in bash shell did not help me. def printTweet(self): #extract tweet string tweet_str = str(self.ui.tweet_txt.toPlainText()) ; #tweet string extracted. self.ui.tweet_txt.clear() ; self.tweet_on_twitter(str); def tweet_on_twitter(self,my_tweet) : auth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET); auth.set_access_token(ACCESS_KEY, ACCESS_SECRET) ; api = tweepy.API(auth) ; if api.test() : print 'Test successful' ; else : print 'Test unsuccessful';

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• How to remove default header from WCF REST Outgoing Response?

  - by bmsantos

  The following C# WCF based REST service gives me some undesired headers that I'm not sure if I can remove them trough the API. The interface: [ServiceContract] public interface IControlSystem { [OperationContract] [WebGet] System.IO.Stream About(); } The implementation: public class ControlSystem : IControlSystem { public System.IO.Stream About() { return new System.IO.MemoryStream(ASCIIEncoding.Default.GetBytes("Hello World")); } } Out of a raw socket connection it gives the following response: HTTP/1.1 200 OK Server: ASP.NET Development Server/9.0.0.0 Date: Tue, 15 Jun 2010 13:12:51 GMT X-AspNet-Version: 2.0.50727 Cache-Control: private Content-Type: application/octet-stream Content-Length: 39 Connection: Close Hello World Question is, is it possible to get the server to not report anything other than the actual message? Need it in some calls so due to some small embedded device clients that will try to connect to the server and I would like to minimize the amount of parsing. Thanks, B.

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• [jQuery] [PHP] Image manipulation

  - by robertdd

  hello, I want to do some kind of image editor, after I upload more images i want to make a list with all the thumbnails! after i want to be able to click on one thumb and rotate, duplicate, drag and drop (to change positions of the images), delete the image! all the images i want to be in a php array, if a image is deleted i want to delete the row from array to, if a image is drag and droped i want to change the position in the array to! ok after the user upload all the images and modify some of it how i can make a DONE button to save the positions of the images? for this small project how u suggest me to save the images? (to make a table in mysql and store the names of the images in the database depending on the session id? depending on the IP? any suggestions are welcome! thanks!

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• ASP.NET MVC2 Data Access Layer

  - by Paul

  For a small/medium sized project I'm trying to figure out what is the 'ideal' way to have a domain layer and data access layer. My opinions on coupling tend to be more towards the view that the domain models should not be tightly coupled with the database layer, in other words the data access layer shouldn't actually know anything about the domain objects. I've been looking at Linq-to-sql and it wants to use its own models that it creates, and so it ends up VERY tightly coupled. Whilst I love the way you use linq-to-sql in code I really don't like the way it wants to make its own domain objects. What are some alternatives that I should consider? I tried use NHibernate but I did not like the way I had to use to query and get different objects. I honestly love the syntax and way you use linq, I just don't want it to be so tightly coupled to domain objects.

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• Play Framework: Real-world production experiences?

  - by Rob

  Has anyone used the Play framework for a reasonably complex or large, deployed production app yet? If so, I would like to hear what the pros and cons of that experience were and what you might do differently if you could start over. In particular, I'm interested in how well it worked for projects that are big enough that it requires a small team and/or apps that had requirements that go beyond what demo/test projects can (e.g. scalability requirements). The other question on this topic does not cover use in production, and as we all know, the true wins (and gotchas) of platforms often don't show up until used in battle.

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• No prerequisites are installed on Windows 7 - InstallShield 2010

  - by Sagi1981

  Dear community. has anyone experienced any problems with InstallShield on Windows 7. I have a small application which needs Crystal Reports in order to work. So I have included them in the Setup Wizard, which I have made with InstallShield 2010. It works like a charm, except on windows 7. here it jumps right over the prerequisite installer, and jumps right to the installation of the application. I have searched the web, but it does not seem that anyone has experienced anything like it. Any help is appreciated. I am using installScript, but I can convert the project to MSI if it will help.

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• How to optimize this MySQL query

  - by James Simpson

  This query was working fine when the database was small, but now that there are millions of rows in the database, I am realizing I should have looked at optimizing this earlier. It is looking at over 600,000 rows and is Using where; Using temporary; Using filesort (which leads to an execution time of 5-10 seconds). It is using an index on the field 'battle_type.' SELECT username, SUM( outcome ) AS wins, COUNT( * ) - SUM( outcome ) AS losses FROM tblBattleHistory WHERE battle_type = '0' && outcome < '2' GROUP BY username ORDER BY wins DESC , losses ASC , username ASC LIMIT 0 , 50

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• Cost of using ASP.NET

  - by Mackristo

  One thing that I keep hearing in reference to ASP.NET and MSFT technologies is that they cost money to use. Often when they are being compared to open source languages someone will mention that one factor in favor of open source is that it's free (to an extent). My question is, when does ASP.NET actually cost money to use in terms of using the proprietary technology? Understandably there are the hosting fees, but I'm curious about the fees outside of these hosting fees. I'm especially curious about this as it relates one-person smaller-site development (non-team/large enterprise). Any help is appreciated. (edits) Some excellent answers. Much appreciated The projects that I'm looking to use the technologies for would be personal sites and very small business sites (1 or 2). The intent would of course be that these projects get much bigger. It seems that for commercial production, fees will apply. What about just basic dynamic "shared hosting" sites that provide information?

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• TortoiseSVN: how to set up projects on a existing directory structure of source code

  - by Steve

  I have an old pet project I want to revive (haven't had enough time for it last year - small kid - you know) - so restored old copy of my dev folder from archive, but since I have rebuilt my machine since when - I can't remember what needs to be done now. I installed the latest version of TortoiseSVN, and the existing directory structure from my old dev machine looks like: ProjectName *SubProject1 **branches ***1.1 ***1.2 **tags **trunk *SubProject2 **branches **1.0.3 **1.0.4 **1.0.5 **tags **trunk I tried "import project" but it ask for a url - don't know what to specify there ... can someone post a url to a good TortSVN tutorial - so I could set up my projects quickly (I guess I need to setup SubProject1 and SubProject2) - then I install AnkhSVN for VS2008 and will spend this Sunday coding like crazy while I still have some time ;-)

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• WCF SSL secure transfer or large payloads without changing firewall.

  - by Sir Mix

  I need to transfer small amounts of data intermittently from clients to our server in a secure fashion and pull down large binary files from the server ocassionally. It's important for all this to be reliable. I'm anticipating 100,000 clients. I control both ends, but I want to deliver a solution that doesn't require changing the firewall for the majority of customers. A lag of one or two minutes before the information migrates to the server or comes down seems to be acceptable at this time. We need to make the connection secure, so was thinking about SSL, but open to suggestions. Basically, what is the best binding to use in this situation so that we have a secure transmission and the system handles the stress and load in a way that works for 95% of clients out of the box (firewalls will not block in majority of firewall configurations).

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• fourier transform to transpose key of a wav file

  - by tbischel

  I want to write an app to transpose the key a wav file plays in (for fun, I know there are apps that already do this)... my main understanding of how this might be accomplished is to 1) chop the audio file into very small blocks (say 1/10 a second) 2) run an FFT on each block 3) phase shift the frequency space up or down depending on what key I want 4) use an inverse FFT to return each block to the time domain 5) glue all the blocks together But now I'm wondering if the transformed blocks would no longer be continuous when I try to glue them back together. Are there ideas how I should do this to guarantee continuity, or am I just worrying about nothing?

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• Only send populated object properties over WCF?

  - by dlanod

  I have an object that is being sent across WCF that is essentially a property holder - it can potentially have a large number of properties, i.e. up to 100, but in general only a small subset will be set, up to 10 for instance. Example: [DataContract(Namespace = "...")] public class Monkey { [DataMember] public string Arms { get; set; } [DataMember] public string Legs { get; set; } [DataMember] public string Heads { get; set; } [DataMember] public string Feet { get; set; } [DataMember] public string Bodies { get; set; } /* repeat another X times */ } Is there a way to tell WCF to only send the populated properties over the wire? It seems like a potential waste of bandwidth to send over the full object.

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• JVM (embarrasingly) parallel processing libraries/tools

  - by Winterstream

  I am looking for something that will make it easy to run (correctly coded) embarrassingly parallel JVM code on a cluster (so that I can use Clojure + Incanter). I have used Parallel Python in the past to do this. We have a new PBS cluster and our admin will soon set up IPython nodes that use PBS as the backend. Both of these systems make it almost a no-brainer to run certain types of code in a cluster. I made the mistake of using Hadoop in the past (Hadoop is just not suited to the kind of data that I use) - the latency made even small runs execute for 1-2 minutes. Is JPPF or Gridgain better for what I need? Does anyone here have any experience with either? Is there anything else you can recommend?

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• What type of git server do you use? or how do you use git?

  - by Johan

  Hi Let's say we have a small team, 1-5 persons. What type of "git setup" would you use? Would you use gitweb and apache so you could run over http? Or would you use the user-accounts and ssh in some way? Today I'm familiar to use SubVersion thou apache (http), but I'm not sure it is right to setup to use git the same way... Thanks Johan Update: It feels like if we combine the answer that Dietrich Epp and the one hallidave gave I could get a quick and good solution. A common dir in the servers filesystem where all can write, and that dir is also exposed with apache. That way everybody can always get the latest, but only trusted people can write to it...

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• Hybrid static/dynamic Google Map

  - by jonathanconway

  Ever noticed that when you go to maps.google.com and do a search (say, car wash), it renders a lot of results (represented by small circles) and a few prominent ones (seen as regular-size pins)? Notice how quickly it does this? From what I can tell from analyzing this in Firebug, much of this is generated on the server and sent to the client as a static image. However, it's still dynamic. You can still zoom in and out, or click on a result and see a dynamic InfoWindow rendered. Google have made the map quick and smooth using static images, while still making it flexible. Is there a way to do this kind of 'pre-loading' with my own Google Map (implemented with the Google Maps API)?

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• To store images in SQL or not?

  - by Brett

  Generally, I had thought it was always better to store images in the filesystem and link to it via the database entry. However, I am trying to optimize my db design and am having a few questions. My images are all really small thumbmails in black and white (not greyscale, but true B&W) and are 70x70 in size. If we take the images (which is basically a 2D array of 1 and 0), it can be stored as binary data that would be approximately 600 bytes each. So my question is whether querying the 600 bytes stored in a db would be faster than querying a link followed by accessing the filesystem; assuming there are a lot of "image" queries being made. Does anyone have any experience with this area? If it matters, I am using MySQL, and MonetDB (separately, but have the same question for both). Many thanks, Brett

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• Decoding bitmaps in Android with the right size

  - by hgpc

  I decode bitmaps from the SD card using BitmapFactory.decodeFile. Sometimes the bitmaps are bigger than what the application needs or that the heap allows, so I use BitmapFactory.Options.inSampleSize to request a subsampled (smaller) bitmap. The problem is that the platform does not enforce the exact value of inSampleSize, and I sometimes end up with a bitmap either too small, or still too big for the available memory. From http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize: Note: the decoder will try to fulfill this request, but the resulting bitmap may have different dimensions that precisely what has been requested. Also, powers of 2 are often faster/easier for the decoder to honor. How should I decode bitmaps from the SD card to get a bitmap of the exact size I need while consuming as little memory as possible to decode it?

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• High volume SVM (machine learning) system

  - by flyingcrab

  I working on a possible machine learning project that would be expected to do high speed computations for machine learning using SVM (support vector machines) and possibly some ANN. I'm resonably comfortable working on matlab with these, but primarly in small datasets, just for experimentation. I'm wondering if this matlab based approach will scale? or should i be looking into something else? C++ / gpu based computing? java wrapping of the matlab code and pushing it onto app engine? Incidentally, there seems to be a lot fo literature on GPUs, but not much on how useful they are on machine learning applications using matlab, & the cheapest CUDA enlabled GPU money can buy? is it even worth the trouble?

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