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  • Design pattern: static function call with input/output containers?

    - by Pavlo Dyban
    I work for a company in software research department. We use algorithms from our real software and wrap them so that we can use them for prototyping. Every time an algorithm interface changes, we need to adapt our wrappers respectively. Recently all algorithms have been refactored in such a manner that instead of accepting many different inputs and returning outputs via referenced parameters, they now accept one input data container and one output data container (the latter is passed by reference). Algorithm interface is limited to a static function call like that: class MyAlgorithm{ static bool calculate(MyAlgorithmInput input, MyAlgorithmOutput &output); } This is actually a very powerful design, though I have never seen it in a C++ programming environment before. Changes in the number of parameters and their data types are now encapsulated and they don't change the algorithm callback. In the latest algorithm which I have developed I used the same scheme. Now I want to know if this is a popular design pattern and what it is called.

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  • How important is to avoid name collisions between libraries belonging to different domains?

    - by Sergio
    I have written a small open source Java library for facilitating conversions between different types of objects (in the style of Google's gson, but quite more general). It seems to me that a nice natural name for my library is JConverter, after browsing in the web to see if another library with the same name already exists, I found a library with the same name for Joomla. My concrete question is: How important is to avoid naming collisions when creating an open source library if an existing library with the chosen name already exists in a complete different domain ? (in my concrete case, these are libraries even implemented for different languages).

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  • Type Conversion in JPA 2.1

    - by delabassee
    The Java Persistence 2.1 specification (JSR 338) adds support for various new features such as schema generation, stored procedure invocation, use of entity graphs in queries and find operations, unsynchronized persistence contexts, injection into entity listener classes, etc. JPA 2.1 also add support for Type Conversion methods, sometime called Type Converter. This new facility let developers specify methods to convert between the entity attribute representation and the database representation for attributes of basic types. For additional details on Type Conversion, you can check the JSR 338 Specification and its corresponding JPA 2.1 Javadocs. In addition, you can also check those 2 articles. The first article ('How to implement a Type Converter') gives a short overview on Type Conversion while the second article ('How to use a JPA Type Converter to encrypt your data') implements a simple use-case (encrypting data) to illustrate Type Conversion. Mission critical applications would probably rely on transparent database encryption facilities provided by the database but that's not the point here, this use-case is easy enough to illustrate JPA 2.1 Type Conversion.

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  • Looking for menu-driven coding platforms

    - by user2634047
    Can anyone point me to an application development environment that uses menu-driven coding? This would mean where commands, variable names, etc. are not keyed in, but rather are selected from a menu of context-specific options. For example, the user selects an If...then command from a menu of commands, and is then presented with a menu of variables to choose from for the the 'if' conditions(s) (or creates new variable(s) on the fly via the menu), and is then presented with a menu of applicable functions that are applicable to the selected variable (e.g., val()), and so on until the If...then statement has been fully coded. The idea is that the user never types any portion of the code, but selects all code elements from a menu, or defines them on the fly via the menu. Thanks.

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  • memory and time intensive php task

    - by Goddard
    Sorry if this question has been asked before, but I couldn't find anything usable. I'm working on a project for a client and currently I have to loop through the users table which is about 3000 records and still growing. I have to do some calculations on a nightly basis which I am going to be using cron/php. The calculations script uses about 3.5mb of memory and takes about 1 second to run. When loading individual users my current php setup handles this fine, but if I try and loop through the user list my php script execution time runs out. I've read after doing some searching that I can make the page reload itself after each user calculation and just keep my previous place in the loop and this sounds like a good idea, but I wanted to hear some opinions from others that have handled similar situations and how you handled these types of tasks. Thanks.

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  • Comment êtes-vous payé(e) par rapport à la moyenne du secteur IT ? Une étude du cabinet Hays donne d

    Comment êtes-vous payé(e) par rapport à la moyenne du secteur IT ? Une étude très complète du cabinet Hays donne des éléments de réponse Le cabinet Hayes vient de mettre en ligne les résultats d'une étude sur les salaires des professionnels du secteur informatique en 2009. L'étude souligne deux points importants. Les rémunérations des informaticiens ont stagné l'année dernière. Mais dans le même temps, des profils liés à l'évolution du Net (Réseaux Sociaux, etc.) semblent de plus en plus recherchés. Pour ne pas comparer des choux avec des carottes, les résultats ont été séparés en fonction des types de fonction. Pour une plus grande finesse d'analyse...

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  • What is the biggest weakness of students graduating with degrees in Computer Science?

    - by akobre01
    This question is directed more toward employers and graduate student advisors/professors but all opinions are welcome. What do you find is a common weakness of new hires and/or new grad students? Is it entirely variable dependent on the student and his or her university? Is there a particular skill or skillset that you wish new hires/researchers had expertise in and how can we remedey this deficiency? I realize that this question is general and really encapsulates two questions, one more about the weaknesses of new software engineers and one about the weaknesses of new researchers. However, both types of people tend to come from similar courses of study so I'm wondering if there is any overlap. Note: I am not a professor but I'm interested in how best to revise the undergraduate curriculum in CS.

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  • Drupal 7: Documents as a node/block/field

    - by WernerCD
    I'm working on my first Drupal site. I've progressed in learning the basics . I still have a lot to learn tho. Using FileViewer I can load a PDF saved in a field, for view content of various types. I haven't found something that does the same for Word Docs, Excel, PDF, etc. Does anyone know of something that works in Drupal 7 to load documents other than PDF like FileViewer does inside a browser? Or like Scribd does (Scribd is hosted. I am behind a firewall with limited access for users. So I don't want to use a Scribd like service.)

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  • What is the concept behind writing a cancel operation in c++?

    - by ToMan
    I'm attempting to write a cancel operation for a software download application. This application will first transfer the software to the device and then install the software on it. (These are givens I'm not allowed to change). What should the cancel operation do? When a user presses 'cancel', the application should stop transferring/installing the software immediately. Question: Since I've never written a "cancel" function, I'm wondering what are the types of things to consider when writing the code, and what are the common bugs I should expect and how to deal with them? Couldn't find anything in google so if you have some links that would be good reads I'd really appreciate it since I'm not looking for answers I'm just looking for guidelines/macro/concept help

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  • Newbie in ASP.Net

    - by dnvThai
    I am learning ASP.Net and I am confusing between ASP.Net WebPages, ASP.Net WebForms and ASP.Net MVC. I have read a lot of articles and known the simple difference of their functions, but I don't know the differences of their code. E.g: When I look at int* p = new int(); ... I know that it's C++ style. and Dim A as String it have to be Visual Basic. [?1] I'm not able to detect like that in ASP.Net. How do they different in codes? I use Visual Studio 2010 Express Edition.I like to use C# (I also was learned VisualBasic in shool, but I don't like him). When I create a new project, there're too many types of project, then, I don't know which I should choose (I just want to make a simple site). [?2] What are they used to? Thanks

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  • What library should I use for 2D Geometry? [closed]

    - by Luka
    I've been working on a 2D game in java, but found that java just didn't cut it for me and had forced me to a lot of bad design choices, so I've decided to port all my work to c++. The main reason I've decided change to c++ is that i had reached a point where i had 3 geometry libraries (the native, one from the game engine and one to handle "complex" polygons), none of witch worked very well together and i couldn't keep track of them. I'm new to c++, but i know all the basics. My question is, what would be a good geometry library to use, ideally it should be able to handle integer and decimal data types, have point, line, and polygon classes witch are able to check for intersection and contains. Thanks in advance, Luka

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  • WordPress 3.0 est disponible en français : avec cette nouvelle version le CMS libre en PHP a-t-il at

    Mise à jour du 18/06/10 WordPress 3.0 est disponible en français Avec cette version le CMS libre en PHP a-t-il atteint l'âge de maturité ? WordPress a annoncé aujourd'hui la mise à disposition de la dernière évolution de son logiciel de gestion de sites, WordPress 3.0. WordPress 3.0 est une évolution majeure du CMS écrit en PHP. Sa plus grande nouveauté est la fusion avec le projet MU. Désormais, avec la même installation de WordPress, il sera possible de gérer soit un site normal, soit une véritable plate-forme de sites. Avec cette version, WordPress se dote d'une gestion très fine des types personnalisé...

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  • Service Territories White Paper - Setup and Configuration

    - by LuciaC
    If you use Oracle Teleservice then you are probably using Service Territories to route service requests to the right resources such as Call Center Agents, Field Service Technicians, Technical Support Groups etc.  Getting those routings to happen correctly and efficiently is key to delivering high-quality service, so having the correct territory setup is essential.  The Service development team have published a new White Paper to help you do just that!  The White Paper includes information to help with understanding the required setups: Service Territories - Locating and Sorting matching Territories, and Picking winning Territories How to use Rank and Number of Winners The different Access Types that can be setup Operating Unit and how to use it effectively How to setup and use Service Qualifiers The limitation of some Geographic Qualifiers and how to overcome the limitations How to use Web ADI to maintain Territories. Read Doc ID 1234593.1 to access the white paper.  There was also a recent webcast on Territory Setup and Matching Attributes, you can access the recording via Doc ID 1455786.1.

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  • What are the industry metrics for average spend on dev hardware and software? [on hold]

    - by RationalGeek
    I'm trying to budget for my dev shop and compare our budget items to industry expectations. I'm hoping to find some information on what percentage of a dev's salary is generally spent on tooling, both hardware and software. Where can I find such information? If instead there is a source that looks at raw dollars that is useful, too. I can extrapolate what I need from that. NOTE: Your anecdotal evidence from your own job will not be very helpful. I'm looking for industry average statistics from a credible source. EDIT: I'm reluctant to even keep this question going based on the passionate negative responses of commenters, but I do think this is valuable information (assuming anyone will care to answer) so let me make one attempt to clarify why I'm looking for this information, and then leave it at that. I'm not sure why understanding and validating my motives is a necessary step to providing the information, but apparently that is the case, so I will do my best. Firstly, let me respond to the idea that us "management types" shouldn't use these types of metrics to evaluate budgets. I agree in part. Ideally, you should spend whatever is necessary on developers in order to keep them fully happy and productive. And this is true of all employees. However, companies operate in a world of limited resources, and every dollar spent in one area means a dollar not spent in another. So it is not enough to simply say "I need to spend $10,000 per developer next year" without having some way to justify that position. One way to help justify it is to compare yourself against the industry. If it is the case that on average a software shops spends 5% (making up that number) of their total development budget (salaries being the large portion of the other 95%, for arguments sake), and I'm only spending 3%, it helps in the justification process. So, it is not my intent to use this information to limit what I spend on developers, but rather to arm myself with the necessary justification to spend what I need to spend on developers to give them the best tools I can. I have been a developer for many years and I understand the need for proper tooling. Next, let's examine the idea that even considering the relationship between a spend on developer salaries and developer tooling is ludicrous and should be banned from budgetary thinking. As Jimmy Hoffa put it in their comment, it's like saying "I'm going to spend no more than 10% of median employee salary on light bulbs and coffee from now on.". Well, yes, it is like saying that, and from a budgeting perspective, this is a useful way to look at things. If you know that, on average, an employee consumes X dollars of coffee a year, then you can project a coffee budget based on that. And you can compare it to an industry metric to understand where you fall: do you spend more on coffee than other companies or less? Why might this be? If you are a coffee supply manager, that seems like a useful thought process. The same seems to hold true for developers. Now, on to the idea that I need to compare "apples to apples" and only look at other shops that are in the same place geographically, the same business, the same application architecture, and the same development frameworks. I guess if I could find such a statistic that said "a shop that is exactly identical to yours spends X on developer tooling" it would be wonderful. But there is plenty of value in an average statistic. Here's an analogy: let's say you are working on a household budget and need to decide how much to spend on groceries. Is it enough to know that the average consumer spends 15% on groceries and therefore decide that you will budget exactly 15%? No. You have to tweak your budget based on your individual needs and situation. But the generalized statistic does help in this evaluation. You can know if your budget is grossly off from what others are doing, and this can help you figure out why this is. So, I will concede the point that it would be better to find statistics that align to my shop, though I think any statistics I could find would be useful for what I'm doing. In that light, let's say that my shop is mostly focused on ASP.NET web applications. That doesn't map perfectly to reality because large enterprises have very heterogenous IT environments. But if I was going to pick one technology that is our focus that would be it. But, if you were to point me at some statistics that are related to a Linux shop doing embedded Java applications, I would still find it useful as a point of comparison. SUMMARY: Let me try to rephrase my question. I'm trying to find industry metrics on how much dev shops spend on developer tooling, both hardware and software. I don't so much care whether it is expressed as a percentage of total budget or as X dollars per dev or as Y percentage of salary. Any metric would be useful. If there are metrics that are specific to ASP.NET dev shops in the Northeast US, all the better, but I would be happy to find anything.

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  • Case Management Model and Notation (CMMN) by Torsten Winterberg

    - by JuergenKress
    The beta version of the current working draft of the new OMG paper can be found here. This figure 72 shows an example, how a case (here: writing a document) can be modeled using CMMN elements: Table 43 explains, where the different types of decorators can be used: The meaning if the elements and the decorations are explained in the CMMN beta document. Read the full article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: ACM,BPM,Torsten Winterberg,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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  • Création du forum XQUERY et base de données XML, dédié aux utilisations de XML comme base de données ou avec des SGBD relationnels

    Création d'un forum XQUERY et base de donnée XML dédié aux utilisation de XML en tant que base de donnée ou avec des SGBD relationnels Le développement du format XML, en particulier dans un contexte d'utilisation documentaire (Ooo, word...) mais aussi d'échange de donnée, dut à la complexification de ces mêmes données, a amené à une interaction accrue entre les fichiers XML et les SGBD. Différentes types de solutions ont vues le jour :ensemble de fichier XML intégration dans des SGBD relationnels SGBD XML natif ... Et différents langages d'extraction/constitution pour utiliser ces même données , en fonction de l'environnement...

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  • How to solve cyclic dependencies in a visitor pattern

    - by Benjamin Rogge
    When programming at work we now and then face a problem with visitors and module/project dependencies. Say you have a class A in a module X. And there are subclasses B and C in module Y. That means that module Y is dependent on module X. If we want to implement a visitor pattern to the class hierarchy, thus introducing an interface with the handle Operations and an abstract accept method in A, we get a dependency from module Y to module X, which we cannot allow for architectural reasons. What we do is, use a direct comparison of the types (i.e. instanceof, since we program in Java), which is not satisfying. My question(s) would be: Do you encounter this kind of problem in your daily work (or do we make poor architectural choices) and if so, how is your approach to solve this?

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  • Column-Level Encryption in SQL Server

    Beginning with SQL Server 2005, column-level encryption and decryption capabilities were made available within the database, providing a solution for situations where one-off types of data need to be secured beyond your existing authorization, authentication or firewall settings. This article provides an overview and example of securing a column using native SQL Server cryptography functions. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • Naming interfaces for persistent values

    - by orip
    I have 2 distinct types of persistent values that I'm having trouble naming well. They're defined with the following Java-esque structure, borrowing Guava's Optional for the example and using generic names to avoid anchoring: interface Foo<T> { T get(); void set(T value); } interface Bar<T> { Optional<T> get(); void set(T value); } With Foo, if the value hasn't been set explicitly then there's some default value available or pre-set. With Bar, if the value hasn't been set explicitly then there's a distinct "no value" state. I'm trying to optimize the names for their call sites. For example, someone using Foo may not care whether there's a default value involved, only that they're guaranteed to always have a value. How would you go about naming these interfaces?

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  • Help Improve Oracle Products Usability at OOW

    - by Shay Shmeltzer
    We already wrote about all the great ADF related activities at OOW. But we wanted to also let you know about an additional activity you can participate in at OpenWorld: The Oracle Middleware User Experience team will be conducting focus groups and customer feedback activities at Oracle OpenWorld 2012 (Oct. 1st - Oct. 3rd). Customer participation helps Oracle develop outstanding products and solutions. Professionals of all types are invited to participate: Directors, Project & Product Managers, Finance, Sales, Human Resources, Marketing, Recruiters, Budget Managers,  and more. **To participate in these sessions you do not have to be registered for Oracle OpenWorld.** If you or someone you know is interested in participating, please email [email protected] with the following information: Name: Company Name:  Job Title: Email: Phone Number (work, mobile, include country code):

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  • SQL Server Luxembourg User Group

    Come join the SQL Server Luxembourg UG for free training and networking on June 27th at 5:30pm. Soren Nielsen will take a Deep Dive into SQL Server 2012’s “Always On” High Availability technology. This will be followed by Vern Rabe of the SQL User Group in Portland, Oregon, presenting “Data Types - Think You Know It All? Think Again”. Want faster, smaller backups you can rely on?Use SQL Backup Pro for up to 95% compression, faster file transfer and integrated DBCC CHECKDB. Download a free trial now.

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  • Print Problem: Page Squeezed in Half

    - by iam
    I've just managed to successfully set up my printer (Canon MX320) using the Printing app on Ubuntu 12.04. However the only 1 remaining problem is that each time I tried to print it will only print the file on the top half of the page only: meaning that for some reason, the printer "squeezes" the whole content of each page in the file to fit into the top half of the page only (so the proportion in the print-out is not correct vertically). This happens with every type of file I tried to print (Documents, Images, Web pages). I checked the Printing's setting & properties and couldn't find anything related to this issue yet and I've already made sure to set all the information correct (paper size, source etc.). The Print Preview always display correctly on the screen, but it's only the actual print-out that shows this problem. I also tried with several different types of papers (A4, photos etc.) but the result is always the same: the printer keeps putting the content in the top half of the paper only.

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  • what's the overhead when allocating objects/arrays in Java?

    - by Gnijuohz
    How many bytes an array occupies in Java? Assume It's a 64bit machine and also assume there are N elements in an array, so all these elements would take up 2*N, 4*N or 8*N bytes for different types of array. And a lecture in Coursera says that it would occupy 2*N+24, 4*N+24 or 8*N+24 bytes for a N element array and the 24 byte is called overhead, but didn't explain it. Also objects have overheads, which is 16 bytes. What exactly are these overheads? Also, do these overheads only exist in Java? How about C, C++ and Python?

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  • Tracking logged in vs. non-logged in users in Google Analytics

    - by Justin
    I am building a social media site that is similar is structure to twitter and facebook.com where unauthenticated users who go to https://mysite.com will see a login + sign-up page, and authenticated users who go to https://mysite.com will see their timeline. My question is, what is the best practice (using Google Analytics) for tracking these two different types of users who are viewing completely different content but are visiting the same URL. I tried searching the Google Analytics docs but couldn't find what they suggested for this scenario. Perhaps I just don't know what keywords to search for. Thanks in advance for any help.

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  • Can't boot ubuntu on Lenovo V570

    - by Aaron
    I recently tried to install Ubuntu on my new Lenovo V570, planning to dual boot 11.10 with Windows 7. I realized after installing that it would boot straight into Windows, so I looked up the issue. I read something about UEFI, and found a page suggesting that I wipe the drive with GParted, installing a msdos partition table, and then install Ubuntu. (I tried linux mint first, because that's what I had on my flash drive at the moment.) I attempted this, and now I'm left with a computer that won't boot anything from the hard drive. If I install Ubuntu or Linux Mint 12 using either MSDOS or GPT, it simply skips the hard drive. My BIOS has no option to disable EFI, and I'll admit I know shamefully little about EFI or different types of partition tables. I'd like to know what I have to do to make my computer boot again.

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