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  • Good architecture for user information on separate databases?

    - by James P. Wright
    I need to write an API to connect to an existing SQL database. The API will be written in ASP.Net MVC3. The slight problem is that with existing users of the system, they may have a username on multiple databases. Each company using the product gets a brand new instance of the database, but over the years (the system has been running for 10 years) there are quite a few users (hundreds) who have multiple usernames across multiple "companies" (things got fragmented obviously and sometimes a single Company has 5 "projects" that each have their own database). Long story short, I need to be able to have a single unified user login that will allow existing users to access their information across all their projects. The only thing I can think is storing a bunch of connection strings, but that feels like a really bad idea. I'll have a new Database that will hold the "unified user" information...can anyone suggest a solid system architecture that can handle a setup like this?

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  • Best practices for using namespaces in C++.

    - by Dima
    I have read Uncle Bob's Clean Code a few months ago, and it has had a profound impact on the way I write code. Even if it seemed like he was repeating things that every programmer should know, putting them all together and putting them into practice does result in much cleaner code. In particular, I found breaking up large functions into many tiny functions, and breaking up large classes into many tiny classes to be incredibly useful. Now for the question. The book's examples are all in Java, while I have been working in C++ for the past several years. How would the ideas in Clean Code extend to the use of namespaces, which do not exist in Java? (Yes, I know about the Java packages, but it is not really the same.) Does it make sense to apply the idea of creating many tiny entities, each with a clearly define responsibility, to namespaces? Should a small group of related classes always be wrapped in a namespace? Is this the way to manage the complexity of having lots of tiny classes, or would the cost of managing lots of namespaces be prohibitive?

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  • How important is using the same language for client and server?

    - by Makita
    I have been evaluating architecture solutions for a mobile project that will have a web-service/app in addition to native apps and have been looking at various libraries, frameworks, and stacks like Meteor, this being a sort of "open stack package framework", is tightly bound with Node.js. There is a lot of talk about the benefits of using the same language both client and server side, and I'm not getting it. I could understand if you want to mirror the entire state of a web application on both client and server but struggling to find other wins... Workflow efficiency? I'm trying to understand why client/server language parity is considered to be a holy grail. Why does client/server language parity matter in software development?

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  • Why are there two different kinds of linking, i.e. static and dynamic?

    - by davidk01
    I've been bitten for the n-th time now by a library mismatch between a build and deployment environment. The build environment had libruby.so.2.0 and the deployment environment had libruby.a. One ruby was built with RVM, the other was built with ruby-build. The reason I ran into a problem was because zookeeper was compiled in a build environment that had the shared library but the deployment environment only had the static library. In all the years I've been writing application code I have never once wished that the binaries I was using where linked against shared objects. What is the reason the dichotomy persists to this day on modern operating systems?

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  • What are good reasons to use explicit interface implementation for the sole purpose of hiding members?

    - by Nathanus
    During one of my studies into the intricacies of C#, I came across an interesting passage concerning explicit interface implementation. While this syntax is quite helpful when you need to resolve name clashes, you can use explicit interface implementation simply to hide more "advanced" members from the object level. The difference between allowing the use of object.method() or requiring the casting of ((Interface)object).method() seems like mean-spirited obfuscation to my inexperienced eyes. The text noted that this will hide the method from Intellisense at the object level, but why would you want to do that if it was not necessary to avoid name conflicts?

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  • Using Mock for event listeners in unit-testing

    - by phtrivier
    I keep getting to test this kind of code (language irrelevant) : public class Foo() { public Foo(Dependency1 dep1) { this.dep1 = dep1; } public void setUpListeners() { this.dep1.addSomeEventListener(.... some listener code ...); } } Typically, you want to test what when the dependency fires the event, the class under tests reacts appropriately (in some situation, the only purpose of such classes is to wire lots of other components, that can be independently tested. So far, to test this, I always end up doing something like : creating a 'stub' that implements both a addXXXXListener, that simply stores the callback, and a fireXXXX, that simply calls any registered listener. This is a bit tedious since you have to create the mock with the right interface, but that can do use an introspective framework that can 'spy' on a method, and inject the real dependency in tests Is there a cleaner way to do this kind of things ?

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  • Embedded Model Designing -- top down or bottom up?

    - by Jeff
    I am trying to learn RoR and develop a webapp. I have a few models I have thought of for this app, and they are fairly embedded. For example (please excuse my lack of RoR syntax): Model: textbook title:string type:string has_many: chapters Model: chapter content:text has_one: review_section Model: review_section title:string has_many: questions has_many: answers , through :questions Model: questions ... Model: answers ... My question is, with the example I gave, should I start at the top model (textbook) or the bottom most (answers)?

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  • Algorithm to measure how "diffused" 5,000 pennies are in an economy?

    - by makerofthings7
    Please allow me to use this example/metaphor to describe an algorithm I need. Objects There are 5 thousand pennies. There are 50 cups. There is a tracking history (Passport "stamp" etc) that is associated with each penny as it moves between cups. Definition I'll define a "highly diffused" penny as one that passes through many cups. A "poorly diffused" penny is one that either passes back and forth between 2 cups Question How can I objectively measure the diffusion of a penny as: The number of moves the penny has gone through The number of cups the penny has been in A unit of time (day, week, month) Why am I doing this? I want to detect if a cup is hoarding pennies. Resistance from bad actors Since hoarding is bad, the "bad cup" may simply solicit a partner and simply move pennies between each other. This will reduce the amount of time a coin isn't in transit, and would skew hoarding detection. A solution might be to detect if a cup (or set of cups) are common "partners" with each other, though I'm not sure how to think though this problem. Broad applicability Any assistance would be helpful, since I would think that this algorithm is common to Economics The study of migration patterns of animals, citizens of a country Other natural occurring phenomena ... and probably exists as a term or concept I'm unfamiliar with.

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  • Is Windows 7 written in Xaml? [closed]

    - by Jordan
    Is Windows 7 written using Xaml? Edit Wow, so much hate for such a little question. I'm not an idiot. I know what XAML is. I use it every day. I was just curious whether some of the visual features were laid out with XAML, or if XAML was incorporated in some way to the product. I'm sorry if it is a programming sin not to know what Windows 7 was written in. I mean, I know Windows XP et al used C++/C, I've used Win32 quite a lot (and MFC and .NET).

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  • How to wrap console utils in webserver

    - by Alex Brown
    I have a big dataset (100Mbs/day) and a bunch of console a TCL/TK tools to view it - I want to turn it into a web app that I can build, and others can maintain. In long: my group runs simulations yielding 100s of Mbs of data daily, in multiple (mostly but not only) text forms. We have a bunch of scripts and tools, mostly old school 1990's style stuff requiring a 5-button mouse, as well as lots of ad-hoc scripts that engineers build out of frustration every month or so. These produces UIs, graphs, spreadsheets (various sizes), logs, event histories etc. I want to replace (or at least supplement) the xwindows / console style UI with a web-based one, so I need the following properties: pleasant to program can wrap existing command-line tools in separate views (I don't need to scrape GUIs or anything) as I port logic from the existing scripts I can create a modularised and pleasant codebase to replace it I can attach a web-ui to navigate between views - each view is likely to contain keys which might make sense to view in another I am new to building systems that have logic on the back-end and front-end of a web-server. from that point of view, they do this: backend wraps old-school executables, constructs calls into them and them takes the output and wraps it up, niceifies it and delivers it to the web client. For instance the tool might generate a number of indexed images (per invocation) which I might deliver all at once or on-demand. May (probably) need to to heavy stats on some sources. frontend provides navigation connecting multiple views, performs requests from one view for data from another (or self to self), etc. Probably will have some views with a lot of interactivity. Can people please point me towards viable solutions for this? I know it's a bit of an open question so as answers come in I hope to refine the spec until we have a good match. I guess I expect to see answers like "RoR!" "beans!" "Scala!" but please give an indication of why those are a good fit; I know nothing! I got bumped off SO for asking an open-ended question, so sorry if its OT here too (let me know). I take the policy that I use the best/closest matched language for a project but most of my team are extremely low level (ie pipeline stages and CDyn) so I don't have the peer group to know where to start.

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  • Internal and external API architecture

    - by Tacomanator
    The company I work for maintains a successful SaaS product that grew "organically" over the years. We are planning to expand the line with a suite of new products that will share data with the existing product. To support this, we are looking to consolidate business logic into a single place: a web service layer. The WS layer will be used by: The web applications A tool to import data A tool to integrate with other client software (not an API per se) We also want to create an API that can be used by our customers that are capable of using it to create their own integrations. We are struggling with the following question: Should the internal API (aka the WS layer) and the external API be one in the same, with security and permission settings to control what can be done by who, or should they be two separate applications where the external API just calls the internal API like any other application? So far in our debate it seems that separating them may be more secure, but will add overhead. What have others done in a similar situation?

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  • Company wants to write custom project management tool, rather then use third party product.

    - by Jason Evans
    At the company I work, we are really wanting to get into the agile methodology for developing software. One thing that I'm not excited about is the fact that management wants us to build a custom project management feature inside the company's Intranet. I think this is a total waste of time. There are many great third party tools available (e.g. Axosoft OnTime) that can do everything we need, and more. For how much development time it would cost us to build our own project management module, we could buy numerous licences for a third party product. One concern is that, whilst we are writing code for a client, and using our custom Intranet project management module, we find bugs in the module that need fixing ASAP. That means having to stop work on the client code to fix the Intranet. That just puts shivers down my spine. Another worry I have is lack of functionality. This custom module is going to be so basic, that it will just feel really crap to use. That might sound a bit snooty, but for goodness sake, many third party tools are so feature rich, that the idea of having to write our own tool makes feel very uneasy. In fact, I can't be bothered. What do you guys think? I'm going to raise this issue with my boss, since I feel it's such an important topic to talk about. EDIT: Thanks for the great responses, much appreciated. To summarize some of them: Money Naturally my boss does want to save money, by not forking out a few hundred £'s for licences. However, for us to write a custom tool, it will take x number of days, multiplied by approx £500, which is our costs. I don't see the business value in this. Management have mentioned that they want to sell the Intranet as a product in the future, but it's so custom to our needs (and downright basic), that in order to give it to another client, I can see us having to fork a version of the code and rebuild the majority of it anyway. So it's not like we're gaining anything there in reuse. Features Having our own custom module means not feature bloat - only the functionality we require will be in the product. My issue is that there are plenty of free, open-source project management tools out there with minimal features already. So even if cost is an issue, we could look into open-source. Again it all boils down to the fact that I don't see the point in writing a project management tool in this day and age. It's a bit like writing your own web browser - why?, what's the point? Although management are asking for this tool, just because they are, it does not mean I'm going to please them and do it just because they asked for it. If something does not make sense, then I will raise it as a concern. At the end of the day, it's the developers who write the code, it's the developers who make money for a business. Thus, as far I'm concerned, the devs have a very big role in deciding how a company should manage projects and what tools are used. "I am Spartan, argh!" :) Hmm, I've not been able to make this question a wiki for some reason, thus I'm going to have to pick an answer to accept. Cheers. Jas.

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  • Include all php files in one file and include that file in every page if we're using hiphop?

    - by Hasan Khan
    I understand that in normal php if we're including a file we're merging the source of it in the script and it would take longer for that page to be parsed/processed but if we're using HipHop shouldn't it be ok to just create one single php file and include every file in it (that contains some class) and every page which needs those classes (in separate file each) can just include one single php file? Would this be ok in presence of HipHop?

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  • What to do when the programming activity becomes a problem?

    - by gablin
    I once saw a program (can't remember which) where it talked about people "experiencing flow" when they are doing something they are passionate about. When "in flow", they tend to lose track of time and surrounding, concentrating only on their activity at hand. This happens a lot for me when I program; most particularly when I face a problem. I refuse to give up until it's solved. This usually leads to hours just rushing by and I forget to eat lunch, dinner gets pushed into far into the evening, and when I finally look at the clock, it's way into the wee-hours of the night and I will only get a few hours of sleep before having to rise early in the morning. (This is not to say that I'm in flow only when facing a problem - but I find it particularly hard to stop programming and step back when there's something I can't solve immediately.) I love programming, but I hate it when it disrupts my normal routines (most importantly eating and sleeping patterns). And sitting still for so many hours, staring a screen, is not healthy. Please, any ideas on how I can get my rampant programming activity under control?

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  • Is it common practice to hire third parties to do code reviews for contractors?

    - by blueberryfields
    I recently observed some contract offers which included a "code review by third party" clause - the contract would not pay out fully until the code review was completed and it received a pass. I was surprised, especially considering that these were fairly simple, and small-scale contracts (churning out vanity apps for the iPhone). Is this kind of third-party code review a common thing to run into when contracting out as a programmer?

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  • Perfomance of 8 bit operations on 64 bit architechture

    - by wobbily_col
    I am usually a Python / Database programmer, and I am considering using C for a problem. I have a set of sequences, 8 characters long with 4 possible characters. My problem involves combining sets of these sequences and filtering which sets match a criteria. The combinations of 5 run into billions of rows and takes around an hour to run. So I can represent each sequence as 2 bytes. If I am working on a 64 bit architechture will I gain any advantage by keeping these data structures as 2 bytes when I generate the combinations, or will I be as well storing them as 8 bytes / double ? (64 bit = 8 x 8) If I am on a 64 bit architecture, all registers will be 64 bit, so in terms of operations that shouldn´t be any faster (please correct me if I am wrong). Will I gain anything from the smaller storage requirements - can I fit more combinations in memory, or will they all take up 64 bits anyway? And finally, am I likley to gain anything coding in C. I have a first version, which stores the sequence as a small int in a MySQL database. It then self joins the tabe to itself a number of times in order to generate all the possible combinations. The performance is acceptable, depending on how many combinations are generated. I assume the database must involve some overhead.

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  • How do I make the jump from Android to Windows Phone 7?

    - by Rob S.
    I'm planning on making the jump over from developing apps for Android to developing apps for Windows Phone 7 as well. For starters, I figured I would port over my simplest app. The code itself isn't much of a problem. The transition from Java to C# isn't that bad. It's actually easier than I expected. What is troublesome is switching SDKs. I've already compiled some basic Windows Phone 7 apps and ran through some tutorials but I'm still feeling a bit lost. For example, I'm not sure what the equivalent of a ScrollView on Android would be on Windows Phone 7. So does anyone have any advice or any resources they can offer me to help me make this transition? Additionally, any comments on the Windows Phone 7 app market (especially in comparison to the Android market) would be greatly appreciated as well. Thank you very much in advance for your time.

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  • Paranoid Encryption

    - by Lord Jaguar
    Call me paranoid, but I really like to keep my stuff secret, but readily available on the cloud. So, asking this question. How safe and reliable is encryption software (e.g., truecrypt)? The reason I ask is that, what is I encrypt my data today with this software and after a couple of years, the software is gone ! What happens to my encrypted data? Is it equally safe to AES encrypt using 7-zip? Will it provide the same level or equivalent level of encryption as truecrypt or other encryption software? (I agree truecrypt will be better because of the container encryption it gives.) And what happens if 7-zip shuts down after 5 years? I am sorry if I am sounding paranoid, but I am coming back to my original question... Is there any application/software independent encryption? Meaning, can I encrypt with one software and decrypt with another so that I will not be dependent on just one vendor? I want my encryption to depend ONLY on the password and NOT on the encryption program/software? The next question, can I write my own program that does AES/stronger encryption when I give it a passphrase, so that I don't need to depend on third party software for encryption? If yes, which language supports the same? Can someone give me a heads up as to where to look for in case of writing my own encryption program?

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  • I'm a CS student, and honestly, I don't understand Knuth's books

    - by Raymond Ho
    I stumbled upon this quote from Bill Gates: "You should definitely send me a resume if you can read the whole thing." He was talking about The Art of Programming books. So I was pretty curious and want to read it all. But honestly, I don't understand it. I'm really not that intellectual. So this should be the reason why I can't understand it, but I am eager to learn. I'm currently reading Volume 1 about fundamental algorithms. Are there any books out there that are friendly for novices/slow people like me, which would help to build up my knowledge so that I can read Knuth's book with ease in the future?

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  • Where to look for a programming partner?

    - by David
    Say that you want to start a new project (I'm talking about a serious project — e.g if you had an idea that seems good and profitable — not about something you start just to learn a new technology or just for your enjoyment) but you don't feel like you can do it alone since, for example, you lack the experience or the technical skills to go through all the phases needed to go from the idea to the final product. Say also that you don't simply want to hire someone. You want someone who can be as passionate as you in the job, that is “proficient” in and enthusiast of the same technologies as you are and that possibly has a background similar to yours (e.g. you both are students, you both come from a prestigious univerity or just you're both Star Trek nerds). So, basically you don't want a person to tell what to do (e.g. “implement this and that, slave!”) but someone who can be inspiring and bring something new and important to your project. Someone to go with you from the earliest stage — from clearly shaping the project's philosophy to drawing mockups etc. Someone who agrees to share the outcome of the project, that strongly believes in the idea behind it and is completely 50-50 with you. Now the question is: how to improve your chances of finding this person (or persons)? Where would you look at first? For example, if you had a lot of funds and were looking for someone to hire, you'd maybe post an ad in SO careers or jobs.73signals; if you already had a team and were looking for funding, you'd start a project on kickstarter or indiegogo, or you'd go to some startup event. But if you had to find a good partner (and programmer, of course) for you're project, where would you start looking? Which strategies would you use?

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  • Learning PHP OOP

    - by Ryan Murphy
    I have been coding PHP for about 2 years now and I THINK that I have a very good grasps of the fundamental parts of PHP, i.e. Functions foreach/IF statements sessions/cookies POST/GET Amongst a few others. I want to move on to learning OOP PHP now, so learning how to use classes and making it a really valuable skill. I have 1 requirement, the source must be a respected source that doesn't teach developers bad habits. I have the book: PHP and MySQL Web Development However, as useful as that is I would like an online source. I would like to know from people with experience in OOP PHP, how and where did they learn OOP PHP. Obviously by doing, but I would really appreciate some great resources which help me along the way.

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  • Corporate tech blogs?

    - by shoosh
    I'm trying to convince my emplyer, a small startup, to setup a blog for the engineers to write about interesting topic in technology we use daily. This would be a separate blog than the one dedicated for product and marketing stuff. I was thinking about something like Joel's blog but focused more on actual code rather than management. Do you know of any successful existing blogs like that? Tech blogs run by the employees of a company?

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  • Is there a difference between "self-plagiarizing" in programming vs doing so as a writer?

    - by makerofthings7
    I read this Gawker article about how a writer reused some of his older material for new assignments for different magazines. Is there any similar ethical (societal?) dilemma when doing the same thing in the realm of Programming? Does reusing a shared library you've accumulated over the years amount to self-plagarizm? What I'm getting at is that it seems that the creative world of software development isn't as stringent regarding self-plagarism as say journalism or blogging. In fact on one of my interviews at GS I was asked what kind of libraries I've developed over the years, implying that me getting the job would entail co-licensing helpful portions of code to that company. Are there any cases where although it's legal to self-plagarize, it would be frowned upon in the software world?

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  • How to deal with project managers who micromanage?

    - by entens
    Perhaps I'm just naive, but when I try to decipher the wall of tasks I'm targeted to do over the course of a week, I just can't help but think whoever builds the project schedule needs to get some remedial training on basic project management. For example, I am assigned 13 tasks today, the shortest lasting .13 days (default time metric in Microsoft Project), and the longest lasting .75 days. I can't help but think that it is blatant micromanagement scheduling projects in sub 10 minute intervals. The effects of management are becoming evident in slipped tasks, resource assignment exceeding capacity by a factor of two at some points in time, and spending more time clearing tasks and figuring out what comes next than actually doing work. How can I convince the project manager to create tasks with larger duration and to see the larger picture?

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  • Two Weeks As A Software Estimation Rule of Thumb?

    - by Todd Williamson
    I saw a blog posting that spoke to me: http://james-iry.blogspot.com/2010/10/how-to-estimate-software.html Oddly, this is the kind of estimate that I tend to do on smaller projects. Just about everything is "two weeks" as that is comfortably far enough out. I once had an instructor walk us through how to create a more detailed estimate, wherein we already had the requirements up front, etc. and even after all the careful tabulation and such the final instruction was "Now that you have all this documentation go ahead and double it." Agile practitioners seem to like two weeks also as a sprint length. Is there something magical about two weeks? Is it a hrair number for our psyches or some other kind of crutch? Do you have an immediate default fall-back schedule strategy when you are pressed for an initial delivery date?

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