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• Which design pattern should I be using?

  - by Gabriel

  Here's briefly what I'm trying to do. The user supplies me with a link to a photo from one of several photo-sharing websites (such as Flickr, Zooomr, et. al). I then do some processing on the photo using their respective APIs. Right now, I'm only implementing one service, but I will most likely add more in the near future. I don't want to have a bunch of if/else or switch statements to define the logic for the different websites (but maybe that's necessary?) I'd rather just call GetImage(url) and have it get me the image from whatever service the url's domain is from. I'm confused how the GetImage function and classes should be designed. Maybe I need the strategy pattern? I'm still reading and trying to understand the various design patterns and how I could make one fit in this case. I'm doing this in C#, but this question is language-agnostic.

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• How can I detect whether an image is a PNG or APNG format?

  - by perlit

  APNG is backwards compatible with PNG. I opened up an apng and png file in a hex editor and the first few bytes look identical. So if a user uploads either of these formats, how do I detect what the format really is? I've seen this done on some sites that block apng. I'm guessing the ImageMagick library makes this easy, but what if I were to do the detect without the use of an image processing library (for learning purposes)? Can I look for specific bytes that tell me if the file is apng? Solutions in any language is welcome.

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• c# - pull records from database without timeout

  - by BhejaFry

  Hi folks, i have a sql query with multiple joins & it pulls data from a database for processing. This is supposed to be running on some scheduled basis. So day 1, it might pull 500, day 2 say 400. Now, if the service is stopped for some reason & the data not processed, then on day3 there could be as much as 1000 records to process. This is causing timeout on the sql query. How best to handle this situation without causing timeout & gradually reducing workload to process? TIA

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• How do I set default values on new properties for existing entities after light weight core data migration?

  - by Moritz

  I've successfully completed light weight migration on my core data model. My custom entity Vehicle received a new property 'tirePressure' which is an optional property of type double with the default value 0.00. When 'old' Vehicles are fetched from the store (Vehicles that were created before the migration took place) the value for their 'tirePressure' property is nil. (Is that expected behavior?) So I thought: "No problem, I'll just do this in the Vehicle class:" - (void)awakeFromFetch { [super awakeFromFetch]; if (nil == self.tirePressure) { [self willChangeValueForKey:@"tirePressure"]; self.tirePressure = [NSNumber numberWithDouble:0.0]; [self didChangeValueForKey:@"tirePressure"]; } } Since "change processing is explicitly disabled around" awakeFromFetch I thought the calls to willChangeValueForKey and didChangeValueForKey would mark 'tirePresure' as dirty. But they don't. Every time these Vehicles are fetched from the store 'tirePressure' continues to be nil despite having saved the context.

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• Wireless barcode scanner

  - by Zinx

  Hi All, I have 2 wireless barcode scanners. I have created an application in C# which reads a barcode and sends data to a web service which then manipulates the data and do further processing. When I start aplication, it first tries to connect to web service and will proceed further only if connection succeded. The problem I am facing is, if I deploy the application through visual studio then it works fine and connects to web service. But if I just copy the contents (exe and config files) manually, then it gives error that unknown host name. Can someone please help me to understand how this connection works? Does it needs some special settings in scanner device which visual studio does automatically while deployment? Thanks and Cheers.

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• Problem with Sphinx resultset larger than 16 MB in MySQL

  - by gmemon

  Hello All, I am accessing a large indexed text dataset using sphinxse via MySQL. The size of resultset is on the order of gigabytes. However, I have noticed that MySQL stops the query with following error whenever the dataset is larger than 16MB: 1430 (HY000): There was a problem processing the query on the foreign data source. Data source error: bad searchd response length (length=16777523) length shows the length of resultset that offended MySQL. I have tried the same query with Sphinx's standalone search program. It works fine. I have tried all possible variables in both MySQL and Sphinx, but nothing is helping. I am using Sphinx 0.9.9 rc-2 and MySQL 5.1.46. Thanks

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• A very basic issue with routes in ruby

  - by Haris

  I am new to ruby and while creating a sample application found out an issue that whenever I go to http://127.0.0.1:3000/people/index by default show action is executed and index is taken as a parameter. This is server log: Started GET "/people/index" for 127.0.0.1 at 2010-12-23 18:43:01 +0500 Processing by PeopleController#show as HTML Parameters: {"id"=>"index"} I have this in my route file: root :to => "people#index" resources> :people match ':controller(/:action(/:id(.:format)))' What is going on here and how can I fix the issue?

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• Best way to use SFTP folder as concurrent work queue

  - by Gabe Moothart

  I am writing a c# windows service which will be polling an SFTP folder for new files (one file = one job) and processing them. Multiple instances of the service may be running at the same time, so it is important that they do not step on each other. I realize that an SFTP folder does not make an ideal queue, but that's what I have to work with. What do I need to do to either use this SFTP folder as a concurrent message queue, or safely represent it in a way that can be used concurrently?

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• Build a JavaScript wrapper for a rails-generated XML API?

  - by Thor Thurn

  I am working with a large website written in Ruby on Rails. Thanks to the support for REST in Rails 2, the site's business logic is all accessible via a consistent XML API. Now I want to be able to easily write one or more JavaScript frontends to the site that interact with the generated Rails XML API. Ideally, an automated wrapper for the API could be created in JavaScript, since this would minimize the effort required in writing XML processing code for the more than 500 API functions. How, then, can I automatically generate a wrapper around a given XML API in JavaScript so that it's more pleasant to work with? I've worked with solutions of this nature for Java that generate classes and methods to wrap an API, so my current thinking is that I want something of that nature for JavaScript. I'd be open to an alternative take on the problem, though.

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• Processes sharing cores on Ubuntu system

  - by muckabout

  My coworkers and I share an 8-core server running Ubuntu for our batch processes. I tend to run 4 processes at a time, each of which consumes 100% CPU per core when nothing else is running. When a coworker runs his processes (typically about 4 at a time), his also get 100% per. However, when both of us run ours (he always goes first), his still get 100% and mine seem to divide the remaining processing power and linger in the 10-40% range. I even reniced his process to a lower value and it did not change. What are the issues that may cause this?

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• How do I create a downscaled copy of an FBO in OpenGL?

  - by Jasper Bekkers

  Hi, In order to speed up some post-processing shaders I'm using, I need to perform these operations on a framebuffer that is smaller in size than the actual window (about 1/4th or more). Most of the effects I want to optimize are simple blurring operations that could be replaced (for a large part) by smaller kernel and bilinear filtering. Thus, I need to create a copy of the current FBO into another one. However, I couldn't find anything, that works, on how to do this. I've tried using glBlitframebufferEXT and rendering a fullscreen quad into the other framebuffer, but both paths result in a black texture as output. How do I go about solving this problem?

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• Need help with this Regex + UrlRewriter.NET please :)

  - by Pure.Krome

  Previously, on StackOverflow ... (Summarized) I need to capture all requests, for a particluar subdomain .. and rewrite their destination. Now, the trick to determining the host via regex was solved. Now, i need to make sure all requests to the root index page is rewritten, but i can't figure out the correct regex to find the 'homepage' / website root. this is what i have.... <if header="HTTP_HOST" match="^foo\.mydomain\.com\.au(?::\d+)?/?$"> <!-- snip some other rewrites, eg./buying/product -> ~/Pages/Foo/Bar.aspx --> <rewrite url="^/$" to="~/Pages/SomeWeirdFolder/Home.aspx" processing="stop"/> </if> Now if one of the rewrites were not found, then it falls through and continues. So .. can anyone please help?

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• Android on Eclipse - Adding jar files to an Eclipse Android Project

  - by Shalini

  I am developing an Android App that uses the Google APIs Client Library for Java version 1.12.0. I have added the jar files to the /libs folder (and not to a new /lib folder). I get the following error: Dx trouble processing "javax/xml/namespace/QName.class": Ill-advised or mistaken usage of a core class (java.* or javax.*) when not building a core library. I am NOT using Maven though, and all the answers by others seem to make use of Maven. Android version - 4.1.2 API level 16 Eclipse - Java EE Juno Any suggestions on how I can solve this?

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• How can I make Vim autosave files when it loses focus?

  - by Peeja

  I'm used to my editors autosaving files when they lose focus. I recently switched to MacVim, and I can't recreate that behavior. I tried this: autocmd BufLeave,FocusLost * wall but if a buffer is unnamed when the window or MacVim loses focus, I get an error like the following: Error detected while processing BufLeave Auto commands for "*": E141: No file name for buffer 1 I'm confused, because :wall's documentation says: Write all changed buffers. Buffers without a file name or which are readonly are not written. so I'd expect it to skip unnamed buffers. Is there a better way to do this?

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• PDF text search and split library

  - by Horace Ho

  I am look for a server side PDF library (or command line tool) which can: split a multi-page PDF file into individual PDF files, based on a search result of the PDF file content Examples: Search "Page ???" pattern in text and split the big PDF into 001.pdf, 002,pdf, ... ???.pdf A server program will scan the PDF, look for the search pattern, save the page(s) which match the patten, and save the file in the disk. It will be nice with integration with PHP / Ruby. Command line tool is also acceptable. It will be a server side (linux or win32) batch processing tool. GUI/login is not supported. i18n support will be nice but no required. Thanks~

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• Twisted - how to create multi protocol process and send the data between the protocols

  - by SpankMe

  Hey, Im trying to write a program that would be listening for data (simple text messages) on some port (say tcp 6666) and then pass them to one or more different protocols - irc, xmpp and so on. I've tried many approaches and digged the Internet, but I cant find easy and working solution for such task. The code I am currently fighting with is here: http://pastebin.com/ri7caXih I would like to know how to from object like: ircf = ircFactory('asdfasdf', '#asdf666') get access to self protocol methods, because this: self.protocol.dupa1(msg) returns error about self not being passed to active protocol object. Or maybe there is other, better, easier and more kosher way to create single reactor with multiple protocols and have actions triggeres when a message arrives on any of them, and then pass that message to other protocols for handling/processing/sending? Any help will be highly appreciated!

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• Java: IDE working well with Maven War overlays

  - by Thorbjørn Ravn Andersen

  We have a Java EE 6 web application which is fully mavenized, and we use the Maven "war overlay" facility to add customer specific files, and which currently runs in Glassfish 3.1. We have traditionally used Eclipse for development, but I have found that the combination of Maven processing and War deployments may not be optimal in terms of deployment times, and that the mavenization allows us to use any IDE with good Maven support. Therefore is Eclipse the best bet for our particular scenario (maven war overlays - glassfish, and debugging it) or is e.g. Netbeans or IntelliJ better? Please, back opinions with actual experiences, thanks.

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• Should XML be used server-side, and JSON client-side?

  - by Michel Carroll

  As a personal project, I'm making an AJAX chatroom application using XML as a server-side storage, and JSON for client-side processing. Here's how it works: AJAX Request gets sent to PHP using GET (chat messages/logins/logouts) PHP fetches/modifies the XML file on the server PHP encodes the XML into JSON, and sends back JSON response Javascript handles JSON information (chat messages/logins/logouts) I want to eventually make this a larger-scale chatroom application. Therefore, I want to make sure it's fast and efficient. Was this a bad design choice? In this case, is switching between XML and JSON ok, or is there a better way?

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• Selecting MXML siblings with actionscript, like javascript?

  - by duder

  I'm trying to get the sibling of an mxml tag similar to the way siblings are selected in javascript. Is this possible in Actionscript? For example, when I click the TextArea with id textarea1, I need it to tell me that the sibling has an id of rect1 so I can do further processing to it. <s:Group> <s:TextArea id="textarea1" click="getSibling(event)" /> <s:Rect id="rect1" /> </s:Group>

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• How to leverage Spring Integration in a real-world JMS distributed architecture?

  - by ngeek

  For the following scenario I am looking for your advices and tips on best practices: In a distributed (mainly Java-based) system with: many (different) client applications (web-app, command-line tools, REST API) a central JMS message broker (currently in favor of using ActiveMQ) multiple stand-alone processing nodes (running on multiple remote machines, computing expensive operations of different types as specified by the JMS message payload) How would one best apply the JMS support provided by the Spring Integration framework to decouple the clients from the worker nodes? When reading through the reference documentation and some very first experiments it looks like the configuration of an JMS inbound adapter inherently require to use a subscriber, which in a decoupled scenario does not exist. Small side note: communication should happen via JMS text messages (using a JSON data structure for future extensibility).

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• call multiple c++ functions in python using threads

  - by wiso

  Suppose I have a C(++) function taking an integer, and it is bound to (C)python with python api, so I can call it from python: import c_module c_module.f(10) now, I want to parallelize it. The problem is: how does the GIL work in this case? Suppose I have a queue of numbers to be processed, and some workers (threading.Thread) working in parallel, each of them calling c_module.f(number) where number is taken from a queue. The difference with the usual case, when GIL lock the interpreter, is that now you don't need the interpreter to evaluate c_module.f because it is compiled. So the question is: in this case the processing is really parallel?

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• How can I display characters in a map by mapfile?

  - by sirius

  Hello. I'm trying to show a map using postGIS+Mapserver.And I've displayed a PNG picture in my WEB. However, I want to show some charactors in the map, just like this: this is the example from Mapserver Now I'm using database(postgreSQL), but not a shape file. How can I add the charactors then? Here is a part of my mapfile: LAYER CONNECTIONTYPE postgis NAME "state" //Connect to a remote spatial database CONNECTION "user=postgres dbname=*** host=*** password=***" PROCESSING "CLOSE_CONNECTION=DEFER" DATA "the_geom from province" STATUS ON TYPE POLYGON CLASS STYLE COLOR 122 122 122 OUTLINECOLOR 0 0 0 END LABEL COLOR 132 31 31 SHADOWCOLOR 218 218 218 SHADOWSIZE 2 2 TYPE TURETYPE FONT arial-bold SIZE 12 ANTIALIAS TRUE POSITION CL PARTIALS FALSE MINDISTANCE 300 BUFFER 4 END END Some said adding a "TEXT ([*])" in "LABEL", but I don't know howto? Thanks for your help!

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• What is the correct method to load an XML file and re-write it as a CSV?

  - by codesmack

  I have a XML file that I want to load into an unknown object type. (I say unknown object type because I am not sure what direction to go) Once I have the data loaded I need to do some processing on certain elements that are now loaded into the new object. For sake of example, we can say that the xml file is full of elements named <car> and within the car element I need to process the <mileage> element. Then once this is all done I need to write the file as a CSV file. I would like to do this is the most direct way possible. (The less code the better) I am using VS 2008 C#

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• Using thread inter-communication to increase my server app's IO throughput; not sure how

  - by Howard Guo

  My server application creates a new thread for each incoming connection. Incoming requests are serialized in a BlockingQueue. There is one worker thread taking items from the queue, produce a response and send the response through socket. I have noticed a throughput issue: Currently, worker thread is responsible of sending the response message through socket, thus severely wasting processing power and throughput. I am considering: rather than sending the response itself, why not telling network IO threads to send the response? However, when I think about thread inter-communication, I cannot yet figure out how to approach it: Worker thread will produce a response, but how will it inform the response message to IO thread? Is there a standard/best practice? Thank you.

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• Small methods - Small sprocs

  - by Berlioz

  Uncle Bob recommends having small methods. Do stored procedures have an ideal size? Or can they run on for 100's and 100's of lines long? Also does anyone have anything to say about where to place business logic. If located in stored procedures, the database is being used as data processing tier. If you read Adam Machanic, his bias is toward the database, does that imply long stored procedures that only the author of the sproc understands, leaving maintainers to deal with the mess? I guess there is two inter-related questions, somehow. Thanks in advance for responding to a fuzzy question(s).

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