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  • Why use hashing to create pathnames for large collections of files?

    - by Stephen
    Hi, I noticed a number of cases where an application or database stored collections of files/blobs using a has to determine the path and filename. I believe the intended outcome is a situation where the path never gets too deep, or the folders ever get too full - too many files (or folders) in a folder making for slower access. EDIT: Examples are often Digital libraries or repositories, though the simplest example I can think of (that can be installed in about 30s) is the Zotero document/citation database. Why do this? EDIT: thanks Mat for the answer - does this technique of using a hash to create a file path have a name? Is it a pattern? I'd like to read more, but have failed to find anything in the ACM Digital Library

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  • Word 2010 for writing invoices, starting with XML

    - by TomTom
    Hello, we are doing quite some invoice generation, and so far it is based on some pretty awful word automation that is now in for a review with Word 2010. I would love to move to a XML based format for storing / presenting invoices, only going to a word document in the last stage. This means I can use easily othermeans to present an invoice internally from the XML. We use Word as "last stage" because Word is a lot better than anything else ever discovered for formatting - our invoices have quite some text sometimes, in the invoice item table, and word is smartest with handling page breaks in the "correct" way. Now, here my question: is there any proper way by now to do this with XML easily? I remember Word having (had) in 2007 some XML field mapping mechanism, but it did not handle tables in the XML. Was anything changed? What would be the proposed approach for generating an .docx document (starting with a .dotx templace) for an invoice, if the relevant data is available in XML form?

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  • Writing iPhone apps on linux - What tools do you need

    - by Sia.G
    Hello. I wanted to know if it's possible to WRITE and COMPILE/TEST iPhone apps on a linux platform. I've been on google for a couple of days now, and people either talk about "Mac OS X only!", or "Develop jailbroke apps on Linux". My dev partner has a mac and has a certificate to sign the apps. I don't have a mac, but I will be doing most of the development. So what I want to do is simply develop/test the app in linux, and when it's finished, simply hand over the code to him, who will then compile the finalized app and sign it ready for submission to the app store. Could anyone tell me what linux tools I would need to accomplish this?

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  • Should Factories Persist Entities?

    - by mxmissile
    Should factories persist entities they build? Or is that the job of the caller? Pseudo Example Incoming: public class OrderFactory { public Order Build() { var order = new Order(); .... return order; } } public class OrderController : Controller { public OrderController(IRepository repository) { this.repository = repository; } public ActionResult MyAction() { var order = factory.Build(); repository.Insert(order); ... } } or public class OrderFactory { public OrderFactory(IRepository repository) { this.repository = repository; } public Order Build() { var order = new Order(); ... repository.Insert(order); return order; } } public class OrderController : Controller { public ActionResult MyAction() { var order = factory.Build(); ... } } Is there a recommended practice here?

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  • Structuring the UI code of a single-page EXTjs Web app using Rails?

    - by Daniel Beardsley
    I’m in the process of creating a large single-page web-app using ext-js for the UI components with Rails on the backend. I’ve come to good solutions for transferring data using Whorm gem and Rails support of RESTful Resources. What I haven’t come to a conclusion on is how to structure the UI and business logic aspects of the application. I’ve had a look at a few options, including Netzke but haven’t seen anything that I really think fits my needs. How should a web-application that uses ext-js components, layouts, and controls in the browser and Rails on the server best implement UI component re-use, good organization, and maintainability while maintaining a flexible layout design. Specifically I’m looking for best-practice suggestions for structuring the code that creates and configures UI components (many UI config options will be based on user data) Should EXT classes be extended in static JS for often re-used customizations and then instantiated with various configuration options by generated JS within html partials? Should partials create javascript blocks that instantiate EXT components? Should partials call helpers that return ruby hashes for EXT component config which is then dumped to Json? Something else entirely? There are many options and I'd love to hear from people who've been down this road and found some methodology that worked for them.

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  • Writing an audio player in C#

    - by Malki
    Hi, I have a pretty cool idea for a very special media player. I like to think about this project as a mini-startup, since I don't yet know if my idea is practical. Anyways, before implementing my idea, I first need to be able to implement a simple audio player. My preferred language for this project is C#, simply because it's so easy to use, but any other object oriented language would be fine too I guess. I started out with no knowledge whatsoever about audio. My main goals right now are: Being able to play audio files - as many formats as possible (sort of a VLC type player, but only audio for now). Being able to analyze audio files - as in, reading frequency, amplitude, volume, and other information about the audio. I think maybe a good idea here is to be able to analyze one file format (PCM?), and then temporarily converting any file I want to analyze to that format. This is in order to later implement a mechanism that compares songs and identifies similar songs to recommend to the user (this feature isn't part of my idea, but I figured since it exists in many players nowadays, I need to have it too if I want be able to compete with them). BTW - I currently don't have any knowledge about audio/wavelengths/frequencies and such, so I'd appreciate it if someone could point me in the right direction about this analyzation feature. Maybe in the future I'd expand to playing video files as well, but for now I'm concentrating on audio. After searching the Internet for a while, I've come across LAME. Problem is, it's not C#, and I'm not sure how to use it. I know there is something called "Interoperability", that is supposed to let me work with native DLL files through C#. Any information about that would be helpful as well. Any help would be much appreciated. Thanks, Malki :)

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  • Help Writing Input Data to Database With Wordpress Plugin

    - by HollerTrain
    Hi I am making a wordpress plugin where I need the Admin to enter data into a database table. I am able to install the db table when the Plugin is activated, however I can't figure out how to save the user input. I've asked on the WP forums but they're dead... Any experienced guru who can lend some guidance would be greatly appreciated. <?php /******************************************************************* * INSTALL DB TABLE - ONLY AT RUN TIME * *******************************************************************/ function ed_xml_install() { global $wpdb; $ed_xml_data = $wpdb->prefix . "ed_xml_data"; if($wpdb->get_var("SHOW TABLES LIKE '$ed_xml_data'") != $ed_xml_data) { $sql = "CREATE TABLE " . ed_xml_data . " ( id mediumint(9) NOT NULL AUTO_INCREMENT, name tinytext NOT NULL, address text NOT NULL, url VARCHAR(55) NOT NULL, phone bigint(11) DEFAULT '0' NOT NULL, UNIQUE KEY id (id) );"; require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); dbDelta($sql); $name = "Example Business Name"; $address = "1234 Example Street"; $url = "http://www.google.com"; $phone = "523-3232-323232"; $insert = "INSERT INTO " . ed_xml_data . " (phone, name, address, url) " . "VALUES ('" . phone() . "','" . $wpdb->escape($name) . "','" . $wpdb->escape($address) . "', '" . $wpdb->escape($url) . "')"; $results = $wpdb->query( $insert ); } } //call the install hook register_activation_hook(__FILE__,'ed_xml_install'); /******************************************************************* * CREATE MENU, CREATE MENU CONTENT * *******************************************************************/ if ( is_admin() ){ /* place it under the ED menu */ //TODO $allowed_group = ''; /* Call the html code */ add_action('admin_menu', 'ed_xmlcreator_admin_menu'); function ed_xmlcreator_admin_menu() { add_options_page('ED XML Creator', 'ED XML Creator', 'administrator', 'ed_xml_creator', 'ed_xmlcreator_html_page'); } } /******************************************************************* * CONTENT OF MENU CONTENT * *******************************************************************/ function ed_xmlcreator_html_page() { <div> <h2>Editors Deal XML Options</h2> <p>Fill in the below information which will get passed to the .XML file.</p> <p>[<a href="" title="view XML file">view XML file</a>]</p> <form method="post" action="options.php"> <?php wp_nonce_field('update-options'); ?> <table width="510"> <!-- title --> <tr valign="top"> <th width="92" scope="row">Deal URL</th> <td width="406"> <input name="url" type="text" id="url" value="<?php echo get_option('url'); ?>" /> </td> </tr> <!-- description --> <tr valign="top"> <th width="92" scope="row">Deal Address</th> <td width="406"> <input name="address" type="text" id="address" value="<?php echo get_option('address'); ?>" /> </td> </tr> <!-- business name --> <tr valign="top"> <th width="92" scope="row">Business Phone</th> <td width="406"> <input name="phone" type="text" id="phone" value="<?php echo get_option('phone'); ?>" /> </td> </tr> <!-- address --> <tr valign="top"> <th width="92" scope="row">Business Name</th> <td width="406"> <input name="name" type="text" id="name" value="<?php echo get_option('name'); ?>" /> </td> </tr> </table> <input type="hidden" name="action" value="update" /> <input type="hidden" name="page_options" value="hello_world_data" /> <p> <input type="submit" value="<?php _e('Save Changes') ?>" /> </p> </form> </div> ?>

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  • Is there a pattern for this?

    - by Timmy
    i have something that requires a matrix of values, similar to pokemon: i have a class object for each of the types, is there a pattern or a good way to implement this, as a middle layer or in the classes?

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  • Visual studio deployment project error when writing to registry

    - by Rekreativc
    Hello I have a setup for an application that was recently converted to be a framework 4.0 project (don't know if it's relevant). The setup has to write to registry (Local Machine) and until now this has always worked perfectly, however now it fails to write to registry on a clean machine (running Windows 7, 64 bit). The setup does not fail, does not show a warning of any kind, however it does not write to the registry (I even set AlwaysCreate property to true on every key, just in case) which of course causes the application to terminate on startup. What could be the cause of this? I have never encountered such an error before. Edit: I have tried running the installer as administrator, didn't change anything.

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  • how to share a variable between two threads

    - by prmatta
    I just inherited some code, two threads within this code need to perform a system task. One thread should do the system task before the other thread. They should not be performing the system task together. The two threads do not have references to each other. Now, I know I can use some sort of a semaphore to achieve this. But my question is what is the right way to get both threads to access this semaphore. I could create a static variable/method a new class : public class SharedSemaphore { private static Semaphore s = new Semaphore (1, true); public static void performSystemTask () { s.acquire(); } public static void donePerformingSystemTask() { s.release(); } } This would work (right?) but this doesn't seem like the right thing to do. Because, the threads now have access to a semaphore, without ever having a reference to it. This sort of thing doesn't seem like a good programming practice. Am I wrong?

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  • Singletons and other design issues

    - by Ahmed Saleh
    I have worked using different languages like C++/Java and currently AS3. Most applications were computer vision, and small 2D computer games. Most companies that I have worked for, they use Singletons in a language like AS3, to retrieve elements or classes in an easy way. Their problem is basically they needs some variables or to call other functions from other classes. In a language like AS3, there is no private constructor, and they write a hacky code to prevent new instances. In Java and C++ I also faced the situation that I need to use other classe's members or to call their functions in different classes. The question is, is there a better or another design, to let other classes interact with each others without using singletons? I feel that composition is the answer, but I need more detailed solutions or design suggestions.

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  • Writing to a .plist file

    - by sg
    I have a .plist with 2 key values in it. It is of type Dictionary. I am trying to write value to one of the key values. What's wrong with the code below? I also tried using type "Array". That option also does not work. How can I get it to work using Dictionary & also Array? Anyone has working code example? Thanks. I would appreciate any help. NSString *filePath = @"myprefs.plist"; NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath]; [plistDict setValue:@"[email protected]" forKey:@"Email"]; [plistDict writeToFile:filePath atomically: YES];

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  • Question about factory classes

    - by devoured elysium
    Currently I have created a ABCFactory class that has a single method creating ABC objects. Now that I think of it, maybe instead of having a factory, I could just make a static method in my ABC Method. What are the pro's and con's on making this change? Will it not lead to the same? I don't foresee having other classes inherit ABC, but one never knows! Thanks

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  • With MVVM, does each UI window have its own ViewModel?

    - by j0rd4n
    When I'm designing multiple views under the MVVM pattern, does each view get its own ViewModel or do they all share the same one? I understand that this is ultimately a flexible decision, but what is the best practice? My gut tells me to have a ViewModel for each view (i.e. each separate UI window). All of the blog examples of MVVM show a single view but not much beyond that.

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  • How to properly implement the Strategy pattern in a web MVC framework?

    - by jboxer
    In my Django app, I have a model (lets call it Foo) with a field called "type". I'd like to use Foo.type to indicate what type the specific instance of Foo is (possible choices are "Number", "Date", "Single Line of Text", "Multiple Lines of Text", and a few others). There are two things I'd like the "type" field to end up affecting; the way a value is converted from its normal type to text (for example, in "Date", it may be str(the_date.isoformat())), and the way a value is converted from text to the specified type (in "Date", it may be datetime.date.fromtimestamp(the_text)). To me, this seems like the Strategy pattern (I may be completely wrong, and feel free to correct me if I am). My question is, what's the proper way to code this in a web MVC framework? In a client-side app, I'd create a Type class with abstract methods "serialize()" and "unserialize()", override those methods in subclasses of Type (such as NumberType and DateType), and dynamically set the "type" field of a newly-instantiated Foo to the appropriate Type subclass at runtime. In a web framework, it's not quite as straightforward for me. Right now, the way that makes the most sense is to define Foo.type as a Small Integer field and define a limited set of choices (0 = "Number", 1 = "Date", 2 = "Single Line of Text", etc.) in the code. Then, when a Foo object is instantiated, use a Factory method to look at the value of the instance's "type" field and plug in the correct Type subclass (as described in the paragraph above). Foo would also have serialize() and unserialize() methods, which would delegate directly to the plugged-in Type subclass. How does this design sound? I've never run into this issue before, so I'd really like to know if other people have, and how they've solved it.

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  • Are we using IoC effectively?

    - by Juliet
    So my company uses Castle Windsor IoC container, but in a way that feels "off": All the data types are registered in code, not the config file. All data types are hard-coded to use one interface implementation. In fact, for nearly all given interfaces, there is and will only ever be one implementation. All registered data types have a default constructor, so Windsor doesn't instantiate an object graph for any registered types. The people who designed the system insist the IoC container makes the system better. We have 1200+ public classes, so its a big system, the kind where you'd expect to find a framework like Windsor. But I'm still skeptical. Is my company using IoC effectively? Is there an advantage to new'ing objects with Windsor than new'ing objects with the new keyword?

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  • What is the best Design/Way to keep user connected ?

    - by Fasih Hansmukh
    Am working on a POC for self learning in which I want to keep my user connected in LIVE pattern. For example, A game in which 4 user can play at a time , here I need to keep this user connected to my game . M not good at Socket type of programming and love to do that in Services way.What i wana know is 'What is the best way of doing this'. According to my initial Brain Storming, I have decided that I will use SilverLight(In Browser Or Out of Browser) as Front end [I have no issue in that]. I m more concern in back end. Either I make an handler or make a WCF service or use full duplex service and use pooling mechanism for that. As a random thought I come up with a Timer type logic that will fire every after 10 seconds at clients end and get status like Is it now Its turn to roll a dice Home many user left (in case if some of them left) What are connected user status in game like there score/points ect and update game view according to this at his end Kindly place your best answers here that will help me to learn this. Regards and thanks in Advance EDIT: Starting Bounty as i need more feedback. FH

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  • Proper design a Model-Controller in Cocoa?

    - by legege
    Hi, I'm trying to design a simple Cocoa application and I would like to have a clear and easy to understand software architecture. Of course, I'm using a basic MVC design and my question concerns the Model layer. For my application, the Model represents data fetched on the Internet with a XML-RPC API. I'm planning to use Core Data to represent a locally fetched version. How should the data be loaded initially? I'm reading the Cocoa Design Pattern book, and they talk about a Model-Controller that is centric to the Model. How would that be done? Thanks!

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  • Best practice to include log4Net external config file in ASP.NET

    - by Martin Buberl
    I have seen at least two ways to include an external log4net config file in an ASP.NET web application: Having the following attribute in your AssemblyInfo.cs file: [assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log.config", Watch = true)] Calling the XmlConfigurator in the Global.asax.cs: protected void Application_Start() { XmlConfigurator.Configure(new FileInfo("Log.config")); } What would be the best practice to do it?

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  • Problems writing a query to join two tables

    - by Psyche
    Hello, I'm working on a script which purpose is to grant site users access to different sections of the site menu. For this I have created two tables, "menu" and "rights": menu - id - section_name rights - id - menu_id (references column id from menu table) - user_id (references column id from users table) How can a query be written in order to get all menu sections and mark the ones where a given user has access. I'm using PHP and Postgres. Thank you.

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  • When writing a form submit to a file, strip line breaks and commas

    - by bccarlso
    I have a form with a textarea in it. I log the results to a text file on the server, but I would like to strip out any line breaks a user would put in the textarea, as well as any commas that would interfere with importing the comma-delimited log text file into Excel or something for later use. I think this has to do with regex, but I'm no expert and could use some help. Or maybe there is an easy PHP function that will do it?

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  • What should go in each MVVM triad?

    - by Harry
    OK, let's say I am creating a program that will list users contacts in a ListBox on the left side of the screen. When a user clicks on the contact, a bunch of messages or whatever appears in the main part of the window. Now my question is: how should the MVVM triads look? I have two models: Contact, and Message. The Contact model contains a list of Message models. Each ViewModel object will contain a single corresponding Model, right? And what about the Views? I have a "MainView" that is the main window, that will have things like the menu, toolbar etc. Do I put the ListBox in the MainView? My confusion is with what to put where; for example, what should the ContactView contain? Just a single instance of a contact? So the DataTemplate, ControlTemplate, context menus, styles etc for that single contact, and then just have a ListBox of them in the MainView...? Thanks.

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