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• Servlet 3 spec and ThreadLocal

  - by mindas

  As far as I know, Servlet 3 spec introduces asynchronous processing feature. Among other things, this will mean that the same thread can and will be reused for processing another, concurrent, HTTP request(s). This isn't revolutionary, at least for people who worked with NIO before. Anyway, this leads to another important thing: no ThreadLocal variables as a temporary storage for the request data. Because if the same thread suddenly becomes the carrier thread to a different HTTP request, request-local data will be exposed to another request. All of that is my pure speculation based on reading articles, I haven't got time to play with any Servlet 3 implementations (Tomcat 7, GlassFish 3.0.X, etc.). So, the questions: Am I correct to assume that ThreadLocal will cease to be a convenient hack to keep the request data? Has anybody played with any of Servlet 3 implementations and tried using ThreadLocals to prove the above? Apart from storing data inside HTTP Session, are there any other similar easy-to-reach hacks you could possibly advise?

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• Question about Convolutional neural network.

  - by Nhu Phuong

  I readed few book and acticles about Convolutional neural network, it seem I understand the concept but I don't know how to put it up like in image below: from 28x28 normalized pixel INPUT we get 4 feature map 24x24. but how to get them ? size the INPUT image ? or perform image transformation? but what kind of transformation? or cut up the input image to 4 piece 24x24 by 4 corner? I don't understand the process to me it seem they cut up or resize the image to more smaller at each step. please help thanks.

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• Is there a work-around that allows missing data to equal NULL for LOAD DATA INFILE in MySQL?

  - by richardh

  I have a lot of large csv files with NULL values stored as ,, (i.e., no entry). After a lot of searching I found that this is a known "bug", although it may be a feature for some users. Is there a way that I can fix this on the fly without pre-processing? These data are all numeric, so a zero value is very different from NULL. Or if I have to do pre-processing, is there one that is most promising for dealing with tens of csv files of 100mb to 1gb? Thanks!

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• What is the best way to mock a 3rd party object in ruby?

  - by spinlock

  I'm writing a test app using the twitter gem and I'd like to write an integration test but I can't figure out how to mock the objects in the Twitter namespace. Here's the function that I want to test: def build_twitter(omniauth) Twitter.configure do |config| config.consumer_key = TWITTER_KEY config.consumer_secret = TWITTER_SECRET config.oauth_token = omniauth['credentials']['token'] config.oauth_token_secret = omniauth['credentials']['secret'] end client = Twitter::Client.new user = client.current_user self.name = user.name end and here's the rspec test that I'm trying to write: feature 'testing oauth' do before(:each) do @twitter = double("Twitter") @twitter.stub!(:configure).and_return true @client = double("Twitter::Client") @client.stub!(:current_user).and_return(@user) @user = double("Twitter::User") @user.stub!(:name).and_return("Tester") end scenario 'twitter' do visit root_path login_with_oauth page.should have_content("Pages#home") end end But, I'm getting this error: 1) testing oauth twitter Failure/Error: login_with_oauth Twitter::Error::Unauthorized: GET https://api.twitter.com/1/account/verify_credentials.json: 401: Invalid / expired Token # ./app/models/user.rb:40:in `build_twitter' # ./app/models/user.rb:16:in `build_authentication' # ./app/controllers/authentications_controller.rb:47:in `create' # ./spec/support/integration_spec_helper.rb:3:in `login_with_oauth' # ./spec/integration/twit_test.rb:16:in `block (2 levels) in <top (required)>' The mocks above are using rspec but I'm open to trying mocha too. Any help would be greatly appreciated.

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• Why do most Database developers hate Agile

  - by Calm Storm

  To me "Agile" methodology is a common-sense oriented approach and one that should likely be adopted for most software projects. I find that while a lot of Middle Tier Developers and Front End developers find it a very sensible project delivery model, plenty of Database developers (and good ones) seem to be totally against it. They are very keen on knowing the biggest picture and designing a database solution that will cater to that. They do not seem to like "Vertical striping" of a functionality. They would rather see the complete design document/feature document instead of concentrating on small user stories. Sarcasm aside, can someone realistically provide some insight as to why this mentality is prevalent? Especially DB devs? What would be a convincing argument against that?

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• code folding in Visual Studio for F#

  - by Yin Zhu

  I find that I tend to write long source files in F#. Some open source projects in F# also have long source files, e.g. FPersec and F# for excel. So it would be very helpful if code folding (even very limited support) is available in VS for F#. E.g. in a module, we can fold out functions that are stable, only leave functions that are subject to change unfold. Is this feature easy to be supported, e.g. by a third party vendor?

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• Creating huge images

  - by David Rutten

  My program has the feature to export a hi-res image of the working canvas to the disk. Users will frequently try to export images of about 20,000 x 10,000 pixels @ 32bpp which equals about 800MB. Add that to the serious memory consumption already going on in your average 3D CAD program and you'll pretty much guarantee an out-of-memory crash on 32-bit platforms. So now I'm exporting tiles of 1000x1000 pixels which the user has to stitch together afterwards in a pixel editor. Is there a way I can solve this problem without the user doing any work? I figured I could probably write a small exe that gets command-lined into the process and performs the stitching automatically. It would be a separate process and it would thus have 2GB of ram all to itself. Or is there a better way still? I'd like to support jpg, png and bmp so writing the image as a bytestream to the disk is not really possible.

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• URL Mapping prefix in Grails

  - by Furuno

  Recently, I'm trying to migrating my application from CakePHP to Grails. So far it's been a smooth sailing, everything I can do with CakePHP, I can do it with much less code in Grails. However, I have one question : In CakePHP, there's an URL Prefix feature that enables you to give prefix to a certain action url, for example, if I have these actions in my controller : PostController admin_add admin_edit admin_delete I can simply access it from the URL : mysite/admin/post/add mysite/admin/post/edit/1 mysite/admin/post/delete/2 instead of: mysite/post/admin_add mysite/post/admin_edit/1 mysite/post/admin_delete/2 Is there anyway to do this in Grails, or at least alternative of doing this?

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• WebSocket send extra information on connection

  - by MattDiPasquale

  Is there a way for a WebSocket client to send additional information on the initial connection to the WebSocket server? I'm asking because I want the client to send the user ID (string) to the server immediately. I don't want the client to send the user ID in the onopen callback. Why? Because it's faster and simpler. If the WebSocket API won't let you do this, why not? If there's no good reason, how could I suggest they add this simple feature?

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• Asp.net Report Viewer - Custom filter parameters

  - by Chris

  Hi all, for a data warehouse project I need to know about some best practices regarding custom report viewer filters/parameters. Usually I use the standard parameter feature for reports, like multiple select boxes, check boxes, text boxes etc.. But for the current project some reports require more complex report parameters. E.g. a user wants to analyze some measures. For that the user needs to set a filter on a specific address. There are over 100.000 address to choose from, so he has to have the ability to search for an address (full text). Since such features cannot be done with the standard parameters, I will have to create custom params within a ASPX page which are then passed to the report viewer control. So my question is: Are there any best practices on how to create custom parameters? Did anyone had similar problems, if so, how did you solve it?

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• Build a decision tree for classification of large amount data,using python?

  - by kaushik

  Hi,i am working for speech synthesis.In this i have a large number of pronunciation for each phone i.e alphabet and need to classify them according to few feature such as segment size(int) and alphabet itself(string) into a smaller set suitable for that particular context. For this purpose,i have decided to use decision tree for classification.the data to be parsed is in the S expression format.eg:((question)(LEFTNODE)(RIGHTNODE)). i hav idea for building decision tree for normal buit in type such as list..looking for suggestion for implementation for S expression.. kindly help.. Thanks in advance.. Note:this question may look similar to my prev post,srry if cant giv multiple post.already edited it many times so though of wirting new question instead of editing again

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• NoSQL replacement for memcache

  - by Juan Antonio Gomez Moriano

  We are having a situation in which the values we store on memcache are bigger than 1MB. It is not possible to make such values smaller, and even if there was a way, we need to persist them to disk. One solution would be to recompile the memcache server to allow say 2MB values, but this is either not clean nor a complete solution (again, we need to persist the values). Good news is that We can predict quite acurately how many key/values pair we are going to have We can also predict the total size we will need. A key feature for us is the speed of memcache. So question is: is there any noSQL replacement for memcache which will allow us to have values longer than 1MB AND store them in disk without loss of speed? In the past I have used tokyotyrant/cabinet but seems to be deprecated now. Any idea?

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• Can I safely move my project to .NET 4.0?

  - by Decker

  I've migrated my project to VS2010 but have not yet targeted .NET 4.0. It's currently targeting 3.5 SP1 (and CLR 2). The project relies on several third party components -- mostly open source -- that were presumably built against the 2.0 CLR. Can I simply retarget my project to the 4.0 runtime? Or do I have to get new versions of all the referenced assemblies on which it depends? I've read a little about the new in-process side-by-side feature of .NET 4.0, but I don't think it applies here (the example I read was about two different .NET plug ins to an office application). My situation is different. My solution directly references assemblies and I wouldn't think side-by-side applies -- unless I don't understand its purpose. TIA

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• Separate config file for Providers

  - by Vivek

  Hi, In a small test project, I currently have the provider sections in the web.config. I want to move that to a separate config file, like providers.config. My current provider instantiation code is like: //Get the feature's configuration info ProviderConfiguration pc = (ProviderConfiguration)ConfigurationManager.GetSection(DATA_PROVIDER_NAME); This code works if the provider info is in web.config, but how to I read this info from another file (like providers.condfig) because it seems that the ConfigurationManager "reads" only web.config file. I may be missing something very simple here :) Would love to get more inputs on this. Thanks V

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• Can you iterate over chunks() with request.POST in Django?

  - by Sebastian

  I'm trying to optimize a site I'm building with Django/Flash and am having a problem using Django's iterate over chunks() feature. I'm sending an image from Flash to Django using request.POST data rather than through a form (using request.FILES). The problem I foresee is that if there is large user volume, I could potentially kill memory. But it seems that Django only allows iterating over chunks with request.FILES. Is there a way to: 1) wrap my request.POST data into a request.FILES (thus spoofing Django) or 2) use chunks() with request.POST data

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• Agile version control?

  - by Paul Dixon

  I'm trying to work out a good method to manage code changes on a large project with multiple teams. We use subversion at the moment, but I want more flexibility in building a new release than I seem to be able to get with subversion. Here's roughly I want: for each developer to create easily identifiable patches for the project. Each patch delivers a complete user story (a releasable feature or fix). It might encompass many changes to many files. developers are able to easily apply and remove their own and other patches to facilitate testing release manager selects the patches to be used in the next release into a new branch branch is tested, fixes merged in, and ultimately merged into live teams can then pull these changes back down into their sandboxes. I'm looking at stacked git as a way of achieving this, but what other tools or techniques can deliver this sort of workflow?

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• How can I disable TinyMCE from stripping/modifying my HTML in Joomla?

  - by dave

  I've got a site running Joomla with TinyMCE set as the editor. One of the sites editors is now trying to embed a media player into an article but TinyMCE keeps messing up the HTML. I've tried setting the Extended Valid Elements, in the plugin config, to *[*] to allow anything and everything but it's not working. What I'd like is to disable the code stripping "feature" from TinyMCE all together. I don't want it trying to validate my HTML or anything like that. How can I disable the code stripping?

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• Updating Activity UI from Different Activity Method?

  - by stormin986

  I have a tab widget where one of the tabs is a chat-type feature. I want to update the chat data at an interval (variable depending on whether the chat tab is active or not). The best approach seemed to be using an AsyncTask in my main TabActivity class, as that would avoid any issues of the chat activity being destroyed while in the background, while an AsyncTask was running. I wanted to ensure that the Activity isn't destroyed and recreated, thus causing my AsyncTask to be unable to modify the actual active Activity's data. However, now that my AsyncTask is in the TabActivity activity, I don't have a direct way to call my Chat's ListAdapter notifyDataSetChanged() from my onPostExecute() method anymore. Is there a way to get a reference to a given Tab's current Activity from the TabHost/TabActivity? Or, alternatively, can I assume my chat activity will never be destroyed as a child activity of the TabActivity activity (well, never destroyed while the TabActivity is active at least), and then just put the AsyncTask in the Chat Activity?

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• networking application and GUI in python

  - by pygabriel

  I'm writing an application that sends files over network, I want to develop a custom protocol to not limit myself in term on feature richness (http wouldn't be appropriate, the nearest thing is the bittorrent protocol maybe). I've tried with twisted, I've built a good app but there's a bug that makes my GUI blocking, so I've to switch to another framework/strategy. What do you suggest? Using raw sockets and using gtk mainloop (there are select-like functions in the toolkit) is too much difficult? It's viable running two mainloops in different threads? Asking for suggestions

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• WPF: Hidden parent and visible child

  - by oakskc

  As of last night, I decided to start learning about WPF and have been reading through a number of online tutorials and books. This is a huge shift. One feature that has fascinated me is the implicit property value inheritance. I know in the WinForms world, if a control is not visible then neither are any of the child controls. Same seems to be true in the WPF world, as expected. I wondered if explicitly setting the child control's Visibility property would allow for an invisible parent and visible child and it did not. Is this something that would be possible in WPF? Can you have a container control that is hidden with visible children? This is more an exercise of curiosity than anything. I'm still trying to wrap my head around a lot of what I've been reading.

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• Can I use WCF NET.TCP Protocol from Silverlight 4 for a public website ?

  - by pixel3cs

  Does anyone know if the new NET.TCP feature of Silverlight 4 can be used for public websites ? From what I know, in the Silverlight 4 Beta they announced that WCF NET.TCP can only be used for intranet applications. The reason I am asking this is because I want to recode my Silverlight multiplayer chess game (build with SL 3 Sockets support) based on the new SL 4 WCF TCP communication protocol. My Socket implementation is build from scratch and have big issues with thread safe and few unsolvable bugs from my side. I am sure that SL 4 team did a great job and they simplified all hard part for me, letting us, developers, concentrate more on the game code instead on underlying communication layers.

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• Java - JPA - Generators - @SequenceGenerator

  - by Yatendra Goel

  I am learning JPA and have confusion in the @SequenceGenerator annotation. Upto my understanding, it automatically assigns a value to numeric identity fields/properties of an entity. Q1. Does this sequence generator make use of the database's increasing numeric value generating capability or generates the number on his own? Q2. If JPA uses database auto increement feauture, then will it work with datastores that don't have auto increement feature? Q3. If JPA generate numeric value on his own, then how the JPA implementation knows which value to generate next? Does it consult with the database first to see what value was stored last so as to generate the value (last + 1). ====================================================================================== Q4. Please also throw some light on sequenceName and allocationSize properties of @SequenceGenerator annotation.

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• How to check using a script if project is opened in XCode?

  - by delirus

  Hi, I'd like to introduce build number feature for my iPhone project and increase it automatically with every commit to my git repo. I plan to do it using Apple's agvtool, which recommends that project is not opened in XCode at the time So my questions are: 1) So far I know that I need to make an executable script from .git/hooks/pre-commit.sample. How to do the scripting to check if certain project is opened in XCode? 2) pre-commit.sh will be executed upon calling git commit with no args, so whenever someone will commit with -a option, I won't have my build number updated. Is there any way to workaround this? Cheers

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• Ideas for band site, which technology to use?

  - by brux

  I am attempting to design and build a website for my friends band. There is minimal content to be included such as bio,news,enbemdded Audio/Visual material. My web dev expertise is average. I'm basicaly looking for inspiration, I was edging towards embedding a silverlight deepzoom xap object to add some visual stimulation, perhaps by featuring a high res photo of the bandshardware/equipment which zooms when mouseover occurs. Does anyone have any cool ideas for a central feature for this site, and which way to approact it in terms of technique (js,css,silverlight etc) If anyone has any immediate ideas which they think would be cool then I am eager to hear them! Also if anyone can link me to any cool band sites they have come across recently I would be greatful,nothing too complicated though please I will be doing all the work myself. Im want the site to be simple but have a certain wow factor!

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• Is it good to commit files often if using Mercurial or Git?

  - by Jian Lin

  It seems that it is suggested we can commit often to keep track of intermediate changes of code we wrote… such as on hginit.com, when using Mercurial or Git. However, let's say if we work on a project, and we commit files often. Now for one reason or another, the manager wants part of the feature to go out, so we need to do a push, but I heard that on Mercurial or Git, there is no way to push individual files or a folder… either everything committed gets pushed or nothing get pushed. So we either have to revert all those files we don't want to push, or we just never should commit until before we push -- right after commit, we push?

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