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  • Increase the size of a memory mapped file

    - by sandun dhammika
    I am maintaning a memory mapped file to store my tree like datastructure. When I'm updating the datastructure ,I got this problem. The file is limited on it's size and can't be too long or too small. I have a methods like void mapfile_insert_record(RECORD* /* record*/); void mapfile_modify_record(RECORD* /* record*/); Both operations could lead to exceed the space which is free on memory file. How do I overcome this? What strategy I should use. calculate whether it requires to exceed the file as a pre-condition on both methods. Dynamically exceed it , for a example manage a timer and constantly polling file for it's free avaliable size and then automatically extend it. Any ideas or patterns to overcome this problem?

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  • Designing complex query builders in java/jpa/hibernate

    - by Ramraj Edagutti
    I need to build complex sql queries programatically, based on large filter conditions. For example, below are few sample/hypothitical filter conditions, based on which i need to fetch users Country: india States: Andhra Pradesh(AP), Gujarat(GUJ), karnataka(KTK) Districts: All districts in AP except 3 district, 5 any districts from GUJ, all district from KTK except 1 district Cities: All cities in AP, all cities except few, include only 50 specific cities from KTK Villages: similar conditions like above with varies combinations... Currently, we have a query builder, which is very complex in nature, and not easy to modify/re-factory for improvements. So, thinking of complete re-design of it. Any suggesations on how to build this kind of complex query builders programmatically using some best practices/deisgn patterns?

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  • New Windows Phone 7 Developer Guidance released for building line of business applications

    - by Eric Nelson
    Several partners have been asking about guidance on combining Windows Phone 7 applications with Windows Azure. The patterns and practices team recently released new guidance on Windows Phone 7.  This is a continuation of the Windows Azure Guidance. It takes the survey application and makes a version for Windows Phone 7.  The guide includes the following topics: Prism for Windows Phone 7 Reactive Extensions WCF Services on top of Windows Azure Push Notifications Camera & Voice Panorama Much more... Well worth a read if you are an ISV looking at taking Line of Business applications to Windows Phone 7. Related Links: We have created Microsoft Platform Ready to help software houses develop applications for Windows Azure and On-Premise. Check it out and the goodies it can deliver for little effort.

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  • Converting ANTLR AST to Java bytecode using ASM

    - by Nick
    I am currently trying to write my own compiler, targeting the JVM. I have completed the parsing step using Java classes generated by ANTLR, and have an AST of the source code to work from (An ANTLR "CommonTree", specifically). I am using ASM to simplify the generating of the bytecode. Could anyone give a broad overview of how to convert this AST to bytecode? My current strategy is to explore down the tree, generating different code depending on the current node (using "Tree.getType()"). The problem is that I can only recognise tokens from my lexer this way, rather than more complex patterns from the parser. Is there something I am missing, or am I simply approaching this wrong? Thanks in advance :)

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  • IS it ok to use REST for CRUD operations?

    - by l0l0l0l0l
    Recently I moved to Laravel and I was surprised on how good setting the controllers as RESTful is, it made routes and my code cleaner. I'm kinda new on web development and never used REST before since all my clients' projects are basically CRUD operations. Are there any cool buzzword to this "approach" or I'm just stupid for doing it? I don't plan to follow any REST patterns, just to make my life easier and code cleaner. Basically just GET/POST, the other ones are not native anyway so (emulated on hidden form value).

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  • How to use OO for data analysis? [closed]

    - by Konsta
    In which ways could object-orientation (OO) make my data analysis more efficient and let me reuse more of my code? The data analysis can be broken up into get data (from db or csv or similar) transform data (filter, group/pivot, ...) display/plot (graph timeseries, create tables, etc.) I mostly use Python and its Pandas and Matplotlib packages for this besides some DB connectivity (SQL). Almost all of my code is a functional/procedural mix. While I have started to create a data object for a certain collection of time series, I wonder if there are OO design patterns/approaches for other parts of the process that might increase efficiency?

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  • Will dolphins die if I use REST "as CRUD"?

    - by l0l0l0l0l
    Recently I moved to Laravel and I was surprised on how good setting the controllers as RESTful is, it made routes and my code cleaner. I'm kinda new on web development and never used REST before since all my clients' projects are basically CRUD operations. There's any cool buzzword to this "approach" or I'm just stupid for doing it? I don't plan to follow any REST patterns, just to make my life easier and code cleaner. Basicallly just GET/POST, the other ones are not native anyway so (emulated on hidden form value).

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  • VBUG Spring Conference, 28th and 29th March in Reading

    - by Eric Nelson
    I presented at VBUG last year and can confirm that they put on a really good event. This year I stood aside for my “replacement” Steve Plank to work his magic. Worth checking out… VBUG SPRING CONFERENCE 28/29 March 2011 Wokefield Park, Mortimer, Reading RG7 3AH Day One (Mon 28 March): Developing SharePoint 2010 with Visual Studio 2010 - Dave McMahon Cache Out with Windows Server AppFabric – Phil Pursglove Extending your Corporate Network in to the Windows Azure Data Centre with Windows Azure Connect – Steve Plank Silverlight Development on Windows Phone 7 - Andy Wigley Day Two (Tues 29 March): Self Service BI for your users, but what does that mean for you? - Andrew Fryer Design Patterns – Compare and Contrast – Gary Short Projecting your corporate identity to the cloud – Steve Plank May the Silverlight 4 be with you – Richard Costall The Step up to ALM – an Introduction to Visual Studio 2010 TFS for the Visual Sourcesafe User - Richard Fennell For more information go to http://cms.vbug.net (It isn’t free but it is high quality)

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  • Solutions for software using many calls to a server

    - by Val
    I am developing software that uses many calls to a server. On a client side it's a Silverlight application. Almost every time a user clicks on a button in it, it sends 1-5 WCF calls to a server. There can be up to dozen or so users at a time. The server is a database server that serves data to a client. I am an intermediate level developer and am thinking about caching some data and syncing my changes from time to time. Are there any official solutions or technologies for it, like, patterns and such?

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  • Is Data Science “Science”?

    - by BuckWoody
    I hold the term “science” in very high esteem. I grew up on the Space Coast in Florida, and eventually worked at the Kennedy Space Center, surrounded by very intelligent people who worked in various scientific fields. Recently a new term has entered the computing dialog – “Data Scientist”. Since it’s not a standard term, it has a lot of definitions, and in fact has been disputed as a correct term. After all, the reasoning goes, if there’s no such thing as “Data Science” then how can there be a Data Scientist? This argument has been made before, albeit with a different term – “Computer Science”. In Peter Denning’s excellent article “Is Computer Science Science” (April  2005/Vol. 48, No. 4 COMMUNICATIONS OF THE ACM) there are many points that separate “science” from “engineering” and even “art”.  I won’t repeat the content of that article here (I recommend you read it on your own) but will leverage the points he makes there. Definition of Science To ask the question “is data science ‘science’” then we need to start with a definition of terms. Various references put the definition into the same basic areas: Study of the physical world Systematic and/or disciplined study of a subject area ...and then they include the things studied, the bodies of knowledge and so on. The word itself comes from Latin, and means merely “to know” or “to study to know”. Greek divides knowledge further into “truth” (episteme), and practical use or effects (tekhne). Normally computing falls into the second realm. Definition of Data Science And now a more controversial definition: Data Science. This term is so new and perhaps so niche that the major dictionaries haven’t yet picked it up (my OED reference is older – can’t afford to pop for the online registration at present). Researching the term's general use I created an amalgam of the definitions this way: “Studying and applying mathematical and other techniques to derive information from complex data sets.” Using this definition, data science certainly seems to be science - it's learning about and studying some object or area using systematic methods. But implicit within the definition is the word “application”, which makes the process more akin to engineering or even technology than science. In fact, I find that using these techniques – and data itself – part of science, not science itself. I leave out the concept of studying data patterns or algorithms as part of this discipline. That is actually a domain I see within research, mathematics or computer science. That of course is a type of science, but does not seek for practical applications. As part of the argument against calling it “Data Science”, some point to the scientific method of creating a hypothesis, testing with controls, testing results against the hypothesis, and documenting for repeatability.  These are not steps that we often take in working with data. We normally start with a question, and fit patterns and algorithms to predict outcomes and find correlations. In this way Data Science is more akin to statistics (and in fact makes heavy use of them) in the process rather than starting with an assumption and following on with it. So, is Data Science “Science”? I’m uncertain – and I’m uncertain it matters. Even if we are facing rampant “title inflation” these days (does anyone introduce themselves as a secretary or supervisor anymore?) I can tolerate the term at least from the intent that we use data to study problems across a wide spectrum, rather than restricting it to a single domain. And I also understand those who have worked hard to achieve the very honorable title of “scientist” who have issues with those who borrow the term without asking. What do you think? Science, or not? Does it matter?

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  • New videos available #dax #ssas #powerpivot

    - by Marco Russo (SQLBI)
    The collaboration I and Alberto started with Project Botticelli is starting producing content. At this point we have three videos available: DAX in Action shows the power of DAX in PowerPivot solving common patterns not so easy or fast to solve in other languages DAX: Calculated Columns vs. Measures shows the difference between calculated columns and measures in DAX Introduction to DAX has a content corresponding to the title! The first two videos are freely available, the third one is longer and visible only to subscribers. The goal for this series of video is to reach advanced Excel users and BI developers that are new to DAX. If we should categorize this content, it’s a sort of level 200 session in a conference. I don’t expect readers of this blog to watch this video (if not for the sake of curiosity!) but if you have to explain this subject to anyone else and you have other priorities… well, you can add this post to the list of resources you provide for studying the subject!

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  • Learning Asynchronous programming

    - by xenoterracide
    Asynchronous non-blocking event driven programming seems to be all the rage. I have a basic conceptual understanding of what this all means. However what I'm not sure is when and where my code can benefit from being asynchronous, or how to make blocking IO, non-blocking. I'm sure that I can simply use a library to do this, but I'm more interested in more in depth concepts, and the various ways to implement it myself. Are there any comprehensive/definitive books, or other resources on this subject (like GoF for Design Patterns, or K&R for C, tldp for things like bash)? (Note: I'm not sure if this is actually functionally an identical question to my question on Learning event driven programming)

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  • I studied electrical engineering. Can I work as a developer? [closed]

    - by FailedDev
    A while ago I finished my Msc in Electrical Engineering and started working as an engineering consultant where I mostly do development work. I am good at picking up languages/technologies tools. I have fiddled with C/C++/C#/perl/ant/bash/html/css etc. Although I have never had a complain for my work, rather the contrary, I just feel that some day, someone will ask me a real hard task which would maybe seem rather trivial for a computer scientist but hard for me. Should I read/do something to become a better developer. Should I pick up a book about design patterns or algorithms for example? Is this normal that I have this kind of "fear"? Sorry if this is the wrong place to post this question. Please notify me so I can close it if this is the case.

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  • "PHP: Good Parts"-ish book / reference

    - by julkiewicz
    Before I had my first proper contact with Javascript I read an excellent book "Javascript: The Good Parts" by Douglas Crockford. I was hoping for something similar in case of PHP. My first thought was this book: "PHP: The Good Parts" from O'Reilly However after I read the reviews it seems it totally misses the point. I am looking for a resource that would: concentrate on known shortcommings of PHP, give concrete examples, be as exhaustive as possible I already see that things can go wrong. If you want to close this question: Please consider this, I looked through SO, and Programmers for materials. I obviously found this question: http://stackoverflow.com/questions/90924/what-is-the-best-php-programming-book It's general, mine is specific. Moreover I'm reading the top recommendation "PHP Objects, Patterns, and Practice" right now. I find it insufficient -- it doesn't address the bad practices as much as I would like it to. tl;dr My question is NOT a general PHP book request.

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  • I'm porting my app from iOS to Android: what do I need to know?

    - by kubi
    What pitfalls should I avoid? What Java language paradigms do Objective-C developers consistently misunderstand? I learned to program in Java, but I have worked in nothing but Objective-C for years now. How are the design patterns different between Android and iOS? If you've made the transition yourself, what parts of Android confused you or took you longer to learn than it should have? Is Eclipse the best OS X IDE for Android? For the record, my app is very strongly tied to UIKit and Foundation, so the word "porting" may be a misnomer; I'll actually be completely rewriting it for Android. No code reuse. Also, I'm doing this to learn Android, so I'd rather fail at the port and learn Android than take a shortcut.

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  • How should I design a wizard for generating requirements and documentation

    - by user1777663
    I'm currently working in an industry where extensive documentation is required, but the apps I'm writing are all pretty much cookie cutter at a high level. What I'd like to do is build an app that asks a series of questions regarding business rules and marketing requirements to generate a requirements spec. For example, there might be a question set that asks "Does the user need to enter their age?" and a follow-up question of "What is the minimum age requirement?" If the inputs are "yes" and "18", then this app will generate requirements that look something like this: "The registration form shall include an age selector" "The registration form shall throw an error if the selected age is less than 18" Later on down the line, I'd like to extend this to do additional things like generate test cases and even code, but the idea is the same: generate some output based on rules determined by answering a set of questions. Are there any patterns I could research to better design the architecture of such an application? Is this something that I should be modeling as a finite state machine?

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  • I want to master ASP.NET - What concepts should I focus on/What concepts do you most value?

    - by Josh
    I start a job this summer doing work in ASP.NET 4 (C#). I plan on working with some legacy code as well as MVC. I want to get a running start. I have good understanding of HTML/CSS/Javascript, and pretty good understanding of C# itself, Design principles, Design Patterns, and understand masterpages, basic MVC2, and code behinds for web forms. In your opinion what aspects of ASP.NET are the most important to master for web applications? What do you value most in your usage of ASP.NET? Do you have a recommendation for understanding the internals of ASP.NET itself?

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  • How to shift development culture from tech fetish to focusing on simplicity and getting things done?

    - by Serge
    Looking for ways to switch team/individual culture from chasing latest fads, patterns, and all kinds of best practices to focusing on finding quickest and simplest solutions and shipping features. My definition of "tech fetish": Chasing latest fads, applying new technologies and best practices without considering product/project impact, focusing on micro optimization, creating platforms and frameworks instead of finding simple and quick ways to ship product features. Few examples of culture differences: From "Spent a day on trying to map database query with five complex joins in NHibernate" to "Wrote a SQL query and used DataReader to pull data in" From "Wrote super-fast JSON parser in C++" to "Used Python to parse JSON response and call C++ code" From "Let's use WCF because it supports all possible communication standards" to "REST is simple text-based format, let's stick with it and use simple HTTP handlers"

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  • Why should I adopt MVC?

    - by Andrew
    I decided to get my hands wet and got the YII framework for PHP. I created my first application, then created new controller, model and view. Connected to database, got my record passed from controller to the view and printed the hello world. I am confused now. If I have to do the same thing for each page, this seems like a nightmare to me. In each controller I have to do a lot of same operations - declare variables, and pass them to views. I also need to create models for each page and this is all confusing to me. In my idea the main goal of development is to avoid duplication, but what I see here is lots and lots of duplicated code. Please advise and clarify. Maybe you could suggest a good reading about MVC and coding patterns and best practices in MVC. Because so far, it takes much more time to create a small site using MVC than using my own programming schema.

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  • Code and Slides from my Fall 2012 DevConnections Talks

    - by dwahlin
    Thanks to everyone who attended my sessions at the Fall 2012 DevConnections conference in Las Vegas. There was a ton of interest in different JavaScript and HTML5 topics. Here’s a picture taken after finishing up my first talk. The second one was packed (standing room only…forgot to take a picture though unfortunately) – thanks to everyone for the great questions and interest in the sessions! I really enjoyed talking with everyone that came up afterward.   As promised, here’s where you can find the code and slides I demonstrated during my talks on building an HTML5 application with a variety of technologies and structuring JavaScript code. Building the Account at a Glance ASP.NET MVC, HTML5 and jQuery Application Structuring JavaScript Code - Techniques, Strategies and Patterns If you’re on Twitter keep in touch with me through my DanWahlin alias.

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  • How to test robots.txt in googlebot to find out what is being indexed

    - by Amar Jarubula
    This question is a continuation for this answer How to check if googlebot will index a given url? As was told I did go to the Webmaster Tools and tested contents of my robots.txt file. However this is just giving me the info if that content is good enough or not. However for my scenario I need to test whether disallowing some patterns is being indexed or not. For example I have something like this below in my robots.txt disallow:/pattern* My understanding is the URLs with word pattern should not crawled, but how do I test this pattern is enforced while indexing the website?

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  • What are some high quality Enterprise Architecture conferences or training programs?

    - by Stimy
    I am looking for a conference or training which will give me a broad exposure to enterprise level software architecture. I've been with the same company for 10 years and we've grown to the size where we really need to lay out a framework for the applications which support our company's business. The organic growth over the last 10 years has left us with a tightly coupled and fairly messy set of applications. We need to do a better job at componentizing our business entities and have more rigorous control on the interfaces between those entities and our business processes. I'm looking to get a broad, yet practical exposure on design patterns to support that architecture (SOA, messaging, ESB's etc). I'm hoping to gain insight from folks who have direct experience with implementing or working with what would be considered an enterprise class architecture.

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  • What are the recommended resources for learning about the Actor model of concurrent systems?

    - by Larry OBrien
    The Actor concurrency model is clearly gaining favor. Is there a good book that presents the patterns and pitfalls of the model? I am thinking about something that would discuss, for instance, the problems of consistency and correctness in the context of hundreds or thousands of independent Actors. It would be okay if it were associated with a specific language (Erlang, I would imagine, since that seems universally regarded as the proven implementation of Actors), but I am hoping for something more than an introductory chapter or two. I'm actually most interested in Actors as they are implemented in Scala, if there are any such resources available.

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  • How to improve quality of software

    - by hariharan
    Last week in our organization, we triggered a topic related to different ways of improving the quality of software (both technical as well as functional related topics). Since i am a technical person, i suggested following ideas, Use case based detailed design document – Both technical as well as functional specification should be well organized according to use case requirement. Design patterns – Will help developers to adopt common approach irrespective of technologies. Analyze and implement new technologies – Helps to improve the performance as well as the security of the application. As I am not a well experienced technical candidate , i am unable to provide other solutions. If any suggestions or topics related to this (including testing, functional requirement), please post your valuable comments.

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  • Simpler alternative to AngelScript

    - by Vee
    I want to give players the ability to create and share bullet patterns for a shoot'em up. The pattern scripts should have all the common programming stuff like loops, if/else, variables, and so on. But in the end, I just want them to call a "spawn bullet at X, Y with Z angle and A speed" in the C++ game. To spawn a circle of bullets, the user should only have to write a script with a for loop that goes from 0 to 360 and calls the spawn bullet function on every iteration. I tried integrating AngelScript, but I am getting nowhere - it looks way to complex for a simple task like this one. Is there an easy to integrate library that can solve my problem? Thanks.

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