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• google app engine proxy workaround

  - by Lumpy

  I am trying to build a google app engine app in Java. The app is trying to get information from another site. On my computer I am behind a firewall and need to connect to the site through a proxy. Google app engine does not allow the use of java.net.proxy. Is there a way to configure eclipse so it knows that when I use URL.getContent() my local host will connect to that url through a proxy??

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• Google App Engine for Businesses Source License

  - by jacksonemg

  I believe I read that if you wanted to use Google's App Engine, your application needed to be open source. With the recent announcement of App Engine for Business, does the same rule apply? I would like to host an application on this particular platform but have no interest in releasing the code initially (down the road, potentially).

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• Is there a template engine for Node.js?

  - by Seb

  I'm kind of falling in love with Node.js not because you write app code in javascript but because of its performance. I really don't care a lot about how beautiful a server side language might be but how much requests per second it can handle. So anyway I'm looking forward to experiment building an entire webapp using Node.js (and going back to the actual question) is there a template engine similar to let's say the django template engine or something similar (that at least allows you to extend base templates) available for Node.js?

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• Without using a pre-built physics engine, how can I implement 3-D collision detection from scratch?

  - by Andy Harglesis

  I want to tackle some basic 3-D collision detection and was wondering how engines handle this and give you a pretty interface and make it so easy ... I want to do it all myself, however. 2-D collision detection is extremely simple and can be done multiple ways that even beginner programmers could think up: 1.When the pixels touch; 2.when a rectangle range is exceeded; 3.when a pixel object is detected near another one in a pixel-based rendering engine. But 3-D is different with one dimension, but complex in many more so ... what are the general, basic understanding/examples on how 3-D collision detection can be implemented? Think two shaded, OpenGL cubes that are moved next to each other with a simple OpenGL rendering context and keyboard events.

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• Can you recommend wiki, forum, blog & cms plugins for an existing Rails app or should I go the route

  - by Nick Gorbikoff

  Hello. I have an existing Rails internal app, that handles inventory, invoicing, order taking, labeling, data imports/exports, etc, etc. Now I need to add blog, cms, forum and wiki functionality to it. It seems silly to try to roll out my own solutions when there are already some out there. So I was wondering if people could recommend based on their experience: Are there good plugins out there? (Which ones you had experience with?) Would you rather recommend to go the route of engines, and integrate RadiantCMS or similar apps? (please provide recommendations based on your integration experience) Or would you just bite the bullet and roll out your own? Thank you. P.S.: Right now the app is Rails 2.3, but it will get upgraded to Rail 3 in a year, when most gems/plugins that it depends on will be Rails 3 compatible.

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• Does Google app engine supports JDBC?

  - by Rakesh Juyal

  I have heard the Google App Engine[java] do not support JDBC and Hibernate. Is it true? If yes then how do we access the database in Google App Engine. Also, is there any [basic] sample application which can help me understand how to perform CRUD operations in GAE.

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• Error trying to transform image < 1 MB in App Engine

  - by ryan

  So I know that App Engine prevents working with images greater than 1 MB in size, but I'm getting a RequestTooLargeError when I call images.resize on an jpg that is 400K on disk. The dimensions of the jpg are 1600 x 1200, so is it that app engine can't handle resizing images over 1 megapixel, even if the image file itself is a compressed format that is smaller than 1 MB?

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• Is there a simple isometric graphical game engine (using vectors?) that could be used for a (multiplayer) crafting/farming game? [closed]

  - by Renier Wijnen

  Possible Duplicate: Good, free isometric game engine? With little game development experience (albeit having graphical skills and some programming knowledge) a group currently working on a game used to explain permaculture through interaction would like to create a simple concept game. Is there a specific engine or set of tools we could used to achieve this? Being able to make it an (online) multiplayer game would be much preferred. Thank you in advance for your input.

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• Microsoft.Build.Engine Error (default targets): Target GetFrameworkPaths: Could not locate the .NET

  - by Mitchan Adams

  I am writing a webservice, that when called should build a C# project. I'm using the framework 2 reference, Microsoft.Buld.Engine and Microsoft.Build.Framework. If you look under the '<Import>' section .csproj file, by default it has: <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" /> which I then changed to: <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" /> My code to build the csproj is: Engine buildEngine = new Engine(Path.Combine(Environment.GetEnvironmentVariable("SystemRoot"), @"Microsoft.NET\Framework\v2.0.50727")); FileLogger logger = new FileLogger(); logger.Parameters = @"logfile=c:\temp\build.log"; buildEngine.RegisterLogger(logger); bool success = buildEngine.BuildProjectFile([Path_Of_Directory]+ "ProjectName.csproj"); buildEngine.UnregisterAllLoggers(); The success variable returns a false because the build faild. I then check the build.log file and this is the error I recieve: *Build started 3/17/2010 11:16:56 AM. ______________________________ Project "[Path_Of_Directory]\ProjectName.csproj" (default targets): Target GetFrameworkPaths: Could not locate the .NET Framework SDK. The task is looking for the path to the .NET Framework SDK at the location specified in the SDKInstallRootv2.0 value of the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework. You may be able to solve the problem by doing one of the following: 1.) Install the .NET Framework SDK. 2.) Manually set the above registry key to the correct location. Target* I cant understand why it wont build. Any help will be much appreciated. Thanks

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• C# Client to Consume Google App Engine RESTful Webservice (rpc XML)

  - by Ngu Soon Hui

  I think I hit a problem when using C# client to consume Google App Engine Webservice. The Google App Engine code I use is here. This is how the python script on server would look like: from google.appengine.ext import webapp from google.appengine.ext.webapp.util import run_wsgi_app import logging from StringIO import StringIO import traceback import xmlrpclib from xmlrpcserver import XmlRpcServer class Application: def __init__(self): pass def getName(self,meta): return 'example' class XMLRpcHandler(webapp.RequestHandler): rpcserver = None def __init__(self): self.rpcserver = XmlRpcServer() app = Application() self.rpcserver.register_class('app',app) def post(self): request = StringIO(self.request.body) request.seek(0) response = StringIO() try: self.rpcserver.execute(request, response, None) except Exception, e: logging.error('Error executing: '+str(e)) for line in traceback.format_exc().split('\n'): logging.error(line) finally: response.seek(0) rstr = response.read() self.response.headers['Content-type'] = 'text/xml' self.response.headers['Content-length'] = "%d"%len(rstr) self.response.out.write(rstr) application = webapp.WSGIApplication( [('/xmlrpc/', XMLRpcHandler)], debug=True) def main(): run_wsgi_app(application) if __name__ == "__main__": main() The client side ( in Python) is this: import xmlrpclib s = xmlrpclib.Server('http://localhost:8080/xmlrpc/') print s.app.getName() I have no problem in using Python client to retrieve values from Google App Engine, but I do have difficulties in using a C# client to retrieve the values. The error I got was 404 method not found when I am trying to GetResponse from the web request. This is my code var request = (HttpWebRequest)WebRequest.Create("http://localhost:8080/xmlrpc/app"); request.Method = "GET"; request.ContentLength = 0; request.ContentType = "text/xml"; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) //404 method not found error here. { } I think it must be that the url is wrong, but I don't know how to get it right. Any idea?

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• Full-text search on App Engine with Whoosh

  - by Martin

  I need to do full text searching with Google App Engine. I found the project Whoosh and it works really well, as long as I use the App Engine Development Environement... When I upload my application to App Engine, I am getting the following TraceBack. For my tests, I am using the example application provided in this project. Any idea of what I am doing wrong? <type 'exceptions.ImportError'>: cannot import name loads Traceback (most recent call last): File "/base/data/home/apps/myapp/1.334374478538362709/hello.py", line 6, in <module> from whoosh import store File "/base/data/home/apps/myapp/1.334374478538362709/whoosh/__init__.py", line 17, in <module> from whoosh.index import open_dir, create_in File "/base/data/home/apps/myapp/1.334374478538362709/whoosh/index.py", line 31, in <module> from whoosh import fields, store File "/base/data/home/apps/myapp/1.334374478538362709/whoosh/store.py", line 27, in <module> from whoosh import tables File "/base/data/home/apps/myapp/1.334374478538362709/whoosh/tables.py", line 43, in <module> from marshal import loads Here is the import I have in my Python file. # Whoosh ---------------------------------------------------------------------- sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..', 'utils'))) from whoosh.fields import Schema, STORED, ID, KEYWORD, TEXT from whoosh.index import getdatastoreindex from whoosh.qparser import QueryParser, MultifieldParser Thank you in advance for your help!

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• Search engine recommendation for 100 sites of about 4000 pages

  - by fwkb

  I am looking for a search engine that can regularly (daily-ish) scan about 100 pages for changes and index an associated site if changes since the last scan are found. It should be able to handle about 100 sites, each averaging 4000 pages of about 5k average size, each on a different server (but only the one centralized search engine). Each of these sites will have a search form that gets submitted to this search engine. The results that are returned must be specific to the site that submitted them. I create the templates for the external sites, so I can give the search form a hidden field that specifies which site the form is submitted from. What would you recommend I look into? I would love to use a Python-based system for this, if feasible. I am currently using something called iSearch2. It doesn't seem very stable at this scale, the description of the product states it is not really intended to do multiple sites, is in PHP (which is less comfortable to me than Python), and has a few other shortcomings for my specific situation.

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• Updating entity fields in app engine development server

  - by Joey

  I recently tried updating a field in one of my entities on the app engine local dev server via the sdk console. It appeared to have updated just fine (a simple float). However, when I followed up with a query on the entity, I received an exception: "Items in the mSomeList list must all be Key instances". mSomeList is just another list field I have in that entity, not the one I modified. Is there any reason manually changing a field would adversely throw something off such that the server gets confused? Is this a known bug? I wrote an http handler to alter the field through server code and it works fine if I take that approach. Update: (adding details) I am using the python google app engine server. Basically if I go into the Google App Engine Launcher and press the SDK Console button, then go into one of my entities and edit a field that is a float (i.e. change it from 0 to 3.5, for instance), I get the "Items in the mMyList list must all be Key instance" suddenly when I query the entity like this: query = DataModels.RegionData.gql("WHERE mRegion = :1", region) entry = query.get() the RegionData entity is what has the mMyList member. As mentioned previously, if I do not manually change the field but rather do so through server code, i.e. query = DataModels.RegionData.gql("WHERE mRegion = :1", region) entry = query.get() entry.mMyFloat = 3.5 entry.put() Then it works.

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• how do you remember programming related stuff?

  - by dan leadgy

  How do you remember programming related stuff? Did you get the feeling you did encounter the error you have now a few years ago and you could swear you knew the cause but now you forgot it? Did you work with the xsl's string parsing some time ago but now you can't remember exactly which are the string functions altogether from xsl and you have to start from scratch? Or perhaps you forget about some feature from Apache Commons like "filtering a collection by some predicate" that you surely used in the past. So how do you do it? I tried having a blog but when I develop apps, I never find the time to update the blog or write about my experiences. Also, using a wiki is a nice thing but then I found it difficult to keep a clean separation between them since many times I needed to change a blog post to add new information about that topic. This made me think that I actually should have put this topic in the wiki instead of the blog. Do you have any systems that help you remember about your programming experience? What's your setup?

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• 3D game engine for networked world simulation / AI sandbox

  - by Martin

  More than 5 years ago I was playing with DirectSound and Direct3D and I found it really exciting although it took much time to get some good results with C++. I was a college student then. Now I have mostly enterprise development experience in C# and PHP, and I do it for living. There is really no chance to earn money with serious game development in our country. Each day more and more I find that I miss something. So I decided to spend an hour or so each day to do programming for fun. So my idea is to build a world simulation. I would like to begin with something simple - some human-like creatures that live their life - like Sims 3 but much more simple, just basic needs, basic animations, minimum graphic assets - I guess it won't be a city but just a large house for a start. The idea is to have some kind of a server application which stores the world data in MySQL database, and some client applications - body-less AI bots which simulate movement and some interactions with the world and each other. But it wouldn't be fun without 3D. So there are also 3D clients - I can enter that virtual world and see the AI bots living. When the bot enters visible area, it becomes material - loads a mesh and animations, so I can see it. When I leave, the bots lose their 3d mesh bodies again, but their virtual life still continues. With time I hope to make it like some expandable scriptable sandbox to experiment with various AI algorithms and so on. But I am not intended to create a full-blown MMORPG :D I have looked for many possible things I would need (free and open source) and now I have to make a choice: OGRE3D + enet (or RakNet). Old good C++. But won't it slow me down so much that I won't have fun any more? CrystalSpace. Formally not a game engine but very close to that. C++ again. MOgre (OGRE3D wrapper for .NET) + lidgren (networking library which is already used in some gaming projects). Good - I like C#, it is good for fast programming and also can be used for scripting. XNA seems just a framework, not an engine, so really have doubts, should I even look at XNA Game Studio :( Panda3D - full game engine with positive feedback. I really like idea to have all the toolset in one package, it has good reviews as a beginner-friendly engine...if you know Python. On the C++ side, Panda3D has almost non-existent documentation. I have 0 experience with Python, but I've heard it is easy to learn. And if it will be fun and challenging then I guess I would benefit from experience in one more programming language. Which of those would you suggest, not because of advanced features or good platform support but mostly for fun, easy workflow and expandability, and so I can create and integrate all the components I need - the server with the database, AI bots and a 3D client application?

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• Google I/O 2010 - Data pipelines with Google App Engine

  Google I/O 2010 - Data pipelines with Google App Engine Google I/O 2010 - Building high-throughput data pipelines with Google App Engine App Engine 301 Brett Slatkin This session will cover how to build, test, and maintain large-scale data pipelines on Google App Engine. It will cover maximizing efficiency, productionization, and how to deal with changing requirements. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 5 0 ratings Time: 01:01:52 More in Science & Technology

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• my wiki site using mediawiki - databases not found error

  - by Jayapal Chandran

  I had been using mediawiki opensource in my website to display programming articles. Today i tried to access my site but it showed database not found. Mediawiki uses many databases. When i logged in my control panel and checked i can see that most of the databases created by mediawiki is missing so is the reason i am getting this error. I have used mediawiki for two different purposes. It is like two modules. For one the databases are missing and for the other i think the data is corrupt. Do anybody know any issue with mediawiki security or would this be a problem with the webhosting cause we have faced several problems with them initially like before three years and recently the were good. Yet this happened. I have requested to hosting company to look into it and meanwhile i am expecting the help from stackexchange users. How do i check the logs for table deletion?

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• Wiki As an Example to Demystify Cloud Computing

  <b>Chao-Kuei's Notes:</b> "If a self-proclaimed cloud computing provider tries to sell you some expensive and fancy new technology that requires a lot of training on your employees, then be alerted that this may just be a hoax."

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• Search Engine Optimization Strategies 101

  I have learned over the last ten years of internet experience that Search Engine Optimization (SEO) can be an elusive and often overcharged service by "SEO experts." So in this article I will lay out in a simple, step by step fashion how to do search engine optimization that will get your website noticed in the search engine general results. Here are some fundamental search engine optimization strategies to get you started.

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• Google I/O 2010 - Batch data processing with App Engine

  Google I/O 2010 - Batch data processing with App Engine Google I/O 2010 - Batch data processing with App Engine App Engine 201 Mike Aizatsky In this session, attendees will learn how to write map() functions, how to do simple reduce() operations, how to run these over large datasets, and how App Engine is used to accomplish such parallelism. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 38:45 More in Science & Technology

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• Physics Engine [Collision Response, 2-dimensional] experts, help!! My stack is unstable!

  - by Register Sole

  Previously, I struggle with the sequential impulse-based method I developed. Thanks to jedediah referring me to this paper, I managed to rebuild the codes and implement the simultaneous impulse based method with Projected-Gauss-Seidel (PGS) iterative solver as described by Erin Catto (mentioned in the reference of the paper as [Catt05]). So here's how it currently is: The simulation handles 2-dimensional rotating convex polygons. Detection is using separating-axis test, with a SKIN, meaning closest points between two polygons is detected and determined if their distance is less than SKIN. To resolve collision, simultaneous impulse-based method is used. It is solved using iterative solver (PGS-solver) as in Erin Catto's paper. Error-correction is implemented using Baumgarte's stabilization (you can refer to either paper for this) using J V = beta/dt*overlap, J is the Jacobian for the constraints, V the matrix containing the velocities of the bodies, beta an error-correction parameter that is better be < 1, dt the time-step taken by the engine, and overlap, the overlap between the bodies (true overlap, so SKIN is ignored). However, it is still less stable than I expected :s I tried to stack hexagons (or squares, doesn't really matter), and even with only 4 to 5 of them, they hardly stand still! Also note that I am not looking for a sleeping scheme. But I would settle if you have any explicit scheme to handle resting contacts. That said, I would be more than happy if you have a way of treating it generally (as continuous collision, instead of explicitly as a special state). Ideas I have: I would try adding a damping term (proportional to velocity) to the Baumgarte. Is this a good idea in general? If not I would not want to waste my time trying to tune the parameter hoping it magically works. Ideas I have tried: Using simultaneous position based error correction as described in the paper in section 5.3.2, turned out to be worse than the current scheme. If you want to know the parameters I used: Hexagons, side 50 (pixels) gravity 2400 (pixels/sec^2) time-step 1/60 (sec) beta 0.1 restitution 0 to 0.2 coeff. of friction 0.2 PGS iteration 10 initial separation 10 (pixels) mass 1 (unit is irrelevant for now, i modified velocity directly<-impulse method) inertia 1/1000 Thanks in advance! I really appreciate any help from you guys!! :)

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• The 7 Pillars of Search Engine Optimization and Marketing

  Search engine optimization (SEO) is all about bringing your website to the 1st page of every major search engine. However, the ultimate goals of SEO services are to increase targeted traffic to your website, improve convergence and increase sales. A successful search engine optimization strategy must involve all possible elements which fit a specific website. It must include the 7 pillars of search engine optimization.

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• What is Search Engine Optimization?

  Basically, Search Engine Optimization (SEO) is "optimizing" the algorithm of a particular search engine to make a website favorable in the eyes of that particular search engine. Usually, when discussing SEO, the search engine of interest is Google.

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• Spark-View-Engine with ASP.NET MVC2

  - by Ben

  How do you modify a ASP.NET MVC 2.0 project to work with the Spark View Engine? I tried like described here: http://dotnetslackers.com/articles/aspnet/installing-the-spark-view-engine-into-asp-net-mvc-2-preview-2.aspx But somehow it still tries to route to .aspx files. Here the code of my global.asax: public class MvcApplication : System.Web.HttpApplication { public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = "" } // Parameter defaults ); } protected void Application_Start() { SparkViewFactory svf = new SparkViewFactory(); PrecompileViews(svf); AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); } public static void PrecompileViews(SparkViewFactory svf) { var controllerFactory = svf; var viewFactory = new SparkViewFactory(controllerFactory.Settings); var batch = new SparkBatchDescriptor(); batch .For<HomeController>() .For<AccountController>(); viewFactory.Precompile(batch); } } }

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• How to create my own recommendation engine?

  - by Burak Dede

  i am intrested in recommendation engines these days and i wanna improve myself in this area.I am currently reading Programming Collective Intelligence (i think this is the best book about this subject) from OReilly (just started).But i dont have any ideas how to implement engine(what i mean by no idea dont know how to start).Lets say i have project like LastFM in my mind where do (should be implemented on database side or backend side)i start creating recommnedation engine? what level database knowledge will needed? is there any open source ones that can be used for help or any resource? what should be the first steps that i have to do?

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