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• What to choose API based server or Socket based server for data driven application

  - by Imdad

  I am working on a project which has a Desktop Application for MAC/COCOA, a native application for iPhone another native application in iPad. All the application do almost same thing. The applications are data driven applications. Every communication to server is made via a restful API developed in PHP. When a user logs in a lot of data is fetched from server. And to remain in sync with server pooling is done. As there are lot of data to pool it makes application slower and un-reliable. A possible solution that comes into my mind is to use Socket based server. My question is that will it reasonably improve the performance? And which technology (of sockets) will be good as a server side solution for data driven application? I have heard a lot about Node.js. Please give your suggestions.

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• mysql join with multiple values in one column

  - by CYREX

  I need to make a query that creates 3 columns that come from 2 tables which have the following relations: TABLE 1 has Column ID that relates to TABLE 2 with column ID2 In TABLE 1 there is a column called user In TABLE 2 there is a column called names There can be 1 unique user but there can be many names associated to that user. If i do the following i get all data BUT the user column repeats itself for each name it has associated. What i want is for use to appear unique but the names columns appear with all the names associated to the user column but separated by commas, like the following: select user,names from TABLE1 left join TABLE2 on TABLE1.id = TABLE2.id This will show the users repeated everytime a name appears for that user. what i want is to appear like this: USER - NAMES cyrex - pedrox, rambo, zelda homeboy - carmen, carlos, tom, sandra jerry - seinfeld, christine ninja - soloboy etc....

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• Best way to relate code smells to a non technical audience?

  - by Ed Guiness

  I have been asked to present examples of code issues that were found during a code review. My audience is mostly non-technical and I want to try to express the issues in such a way that I convey the importance of "good code" versus "bad code". But as I review my presentation it seems to me I've glossed over the reasons why it is important to write good code. I've mentioned a number of reasons including ease of maintenance, increased likelihood of bugs, but with my "non tech" hat on they seem unconvincing. What is your advice for helping a non-technical audience relate to the importance of good code?

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• What is the best practice for when to check if something needs to be done?

  - by changokun

  Let's say I have a function that does x. I pass it a variable, and if the variable is not null, it does some action. And I have an array of variables and I'm going to run this function on each one. Inside the function, it seems like a good practice is to check if the argument is null before proceeding. A null argument is not an error, it just causes an early return. I could loop through the array and pass each value to the function, and the function will work great. Is there any value to checking if the var is null and only calling the function if it is not null during the loop? This doubles up on the checking for null, but: Is there any gained value? Is there any gain on not calling a function? Any readability gain on the loop in the parent code? For the sake of my question, let's assume that checking for null will always be the case. I can see how checking for some object property might change over time, which makes the first check a bad idea. Pseudo code example: for(thing in array) { x(thing) } Versus: for(thing in array) { if(thing not null) x(thing) } If there are language-specific concerns, I'm a web developer working in PHP and JavaScript.

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• Eclipse: always keep files updated

  - by AK01

  I keep lots of files/editors open in Eclipse. I also love using git stash and other git commands that essentially change the contents of my open files. Is there an Eclipse feature or plugin that will always keep the contents of my open files up to date and live? Currently if I put focus in an out of sync editor, I get an awkwardly worded dialog that I have to parse carefully every time. I wish it would just keep me synced like Textmate does.

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• Is there an established or defined best practice for source control branching between development and production builds?

  - by Matthew Patrick Cashatt

  Thanks for looking. I struggled in how to phrase my question, so let me give an example in hopes of making more clear what I am after: I currently work on a dev team responsible for maintaining and adding features to a web application. We have a development server and we use source control (TFS). Each day everyone checks in their code and when the code (running on the dev server) passes our QA/QC program, it goes to production. Recently, however, we had a bug in production which required an immediate production fix. The problem was that several of us developers had code checked in that was not ready for production so we had to either quickly complete and QA the code, or roll back everything, undo pending changes, etc. In other words, it was a mess. This made me wonder: Is there an established design pattern that prevents this type of scenario. It seems like there must be some "textbook" answer to this, but I am unsure what that would be. Perhaps a development branch of the code and a "release-ready" or production branch of the code?

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• C# Role Provider for multiple applications

  - by Juventus18

  I'm making a custom RoleProvider that I would like to use across multiple applications in the same application pool. For the administration of roles (create new role, add users to role, etc..) I would like to create a master application that I could login to and set the roles for each additional application. So for example, I might have AppA and AppB in my organization, and I need to make an application called AppRoleManager that can set roles for AppA and AppB. I am having troubles implementing my custom RoleProvider because it uses an initialize method that gets the application name from the config file, but I need the application name to be a variable (i.e. "AppA" or "AppB") and passed as a parameter. I thought about just implementing the required methods, and then also having additional methods that pass application name as a parameter, but that seems clunky. i.e. public override CreateRole(string roleName) { //uses the ApplicationName property of this, which is set in web.config //creates role in db } public CreateRole(string ApplicationName, string roleName) { //creates role in db with specified params. } Also, I would prefer if people were prevented from calling CreateRole(string roleName) because the current instance of the class might have a different applicationName value than intended (what should i do here? throw NotImplementedException?). I tried just writing the class without inheriting RoleProvider. But it is required by the framework. Any general ideas on how to structure this project? I was thinking make a wrapper class that uses the role provider, and explicitly sets the application name before (and after) and calls to the provider something like this: static class RoleProviderWrapper { public static CreateRole(string pApplicationName, string pRoleName) { Roles.Provider.ApplicationName = pApplicationName; Roles.Provider.CreateRole(pRoleName); Roles.Provider.ApplicationName = "Generic"; } } is this my best-bet?

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• I want to sell my software [C# desktop application] but I was Stuck in licencing [closed]

  - by Surendra Soni

  Possible Duplicate: if I use .NET Framework for my application, do I have to pay anything to Microsoft? I have developed a desktop application called "Institute Management System" which has modules like Class manager, Subject manager, Topics manager, Student inquiry manager Student admission manager, Fees manager, Exam manager etc. using C# for the front end and MS Access for the back end. The main problem is that I want to sell it and earn some money but I heard that my application needs to be registered at Microsoft, and I would have to get a license from them for selling, and have to pay them money too. I have spent four months developing it at my own expense, and worked very hard to develop it. So I want some tips, advice, any suggestion for the same. Please also tell me the procedure for all of the required registrations and payment issues. And I also want to ask you if you Can you suggest any other technology where I develop my application and sell it without worrying about licencing and related issues? I am now more confused about that "MS technology is open source or not? "

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• In WPF, should I base my converters on types or use-cases?

  - by user1013159

  I'm looking for some advice on how to write my WPF value converters. The way I'm currently writing them, they are very specific, like (bool?,bool) = Brush, i.e. I'm writing each converter for a specific use case, in this case, the Brush is bound to an indicator showing equality information between the bool? and the bool. This obviously makes re-use very hard and I end up with a quite large list of converters. Should I strive to write my converters in a more general way? Can I?

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• C++ 'using': Should I use it or should I avoid it?

  - by Mehrdad

  I realize there are subtly different semantics for some of these, because of ADL. In general, though: Which one should I prefer (if any), and why? (Or does it depend on the situation (e.g. inline header vs. implementation?) Also: should I prefer ::std:: over std::? using namespace std; pair<string::const_iterator, string::const_iterator> f(const string &s) { return make_pair(s.begin(), s.end()); } or std::pair<std::string::const_iterator, std::string::const_iterator> f(const std::string &s) { return std::make_pair(s.begin(), s.end()); } or using std::pair; using std::string; pair<string::const_iterator, string::const_iterator> f(const string &s) { return make_pair(s.begin(), s.end()); } or std::pair<std::string::const_iterator, std::string::const_iterator> f(const std::string &s) { using std::make_pair; return make_pair(s.begin(), s.end()); } or std::pair<std::string::const_iterator, std::string::const_iterator> f(const std::string &s) { using namespace std; return make_pair(s.begin(), s.end()); } or something else? (This is assuming I don't have C++11 and auto.)

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• Detect frameworks and/or CMS utilized on websites in Firefox

  - by jkneip

  I'm redesigning the website for my academic library and am examining other sites to determine to identify the technologies used. Things like: Web frameworks Javascript frameworks Server-side technology Content management system Now I've had some real success in Firefox using plugins like Wappalyzer, Firebug, and the DOM Inspector. But some sites just don't display any of the info. I'm looking for using these tools, especially it seems it an enterprise-level CMS is being used. Does anyone know of any other tools to detect this kind of data? Also with Firebug & the DOM Inspector, there is a lot of info. displayed and I wondered if there was a way to derive the presence of server-side technologies, CMS's, etc. within certain elements of a web page? Also, if this question is more relevant to another Stack Exchange site, please let me know and I'll post it there instead. Much thanks, Jason

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• What is the rationale behind Apache Jena's *everything is an interface if possible* design philosophy?

  - by David Cowden

  If you are familiar with the Java RDF and OWL engine Jena, then you have run across their philosophy that everything should be specified as an interface when possible. This means that a Resource, Statement, RDFNode, Property, and even the RDF Model, etc., are, contrary to what you might first think, Interfaces instead of concrete classes. This leads to the use of Factories quite often. Since you can't instantiate a Property or Model, you must have something else do it for you --the Factory design pattern. My question, then, is, what is the reasoning behind using this pattern as opposed to a traditional class hierarchy system? It is often perfectly viable to use either one. For example, if I want a memory backed Model instead of a database-backed Model I could just instantiate those classes, I don't need ask a Factory to give me one. As an aside, I'm in the process of writing a library for manipulating Pearltrees data, which is exported from their website in the form of an RDF/XML document. As I write this library, I have many options for defining the relationships present in the Peartrees data. What is nice about the Pearltrees data is that it has a very logical class system: A tree is made up of pearls, which can be either Page, Reference, Alias, or Root pearls. My question comes from trying to figure out if I should adopt the Jena philosophy in my library which uses Jena, or if I should disregard it, pick my own design philosophy, and stick with it.

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• Aggregating Excel cell contents that match a label [migrated]

  - by Josh

  I'm sure this isn't a terribly difficult thing, but it's not the type of question that easily lends itself to internet searches. I've been assigned a project for work involving a complex spreadsheet. I've done the usual =SUM and other basic Excel formulas, and I've got enough coding background that I'm able to at least fudge my way through VBA, but I'm not certain how to proceed with one part of the task. Simple version: On Sheet 1 I have a list of people (one on each row, person's name in column A), on sheet 2 I have a list of groups (one on each row, group name in column A). Each name in Sheet 1 has its own row, and I have a "Data Validation" dropdown menu where you choose the group each person belongs to. That dropdown is sourced from Sheet 2, where each group has a row. So essentially the data validation source for Sheet 1's "Group" column is just "=Sheet2!$a1:a100" or whatever. The problem is this: I want each group row in Sheet 2 to have a formula which results in a list of all the users which have been assigned to that group on Sheet 1. What I mean is something the equivalent of "select * from PeopleTab where GROUP = ThisGroup". The resulting cell would just stick the names together like "Bob Smith, Joe Jones, Sally Sanderson" I've been Googling for hours but I can't think of a way to phrase my search query to get the results I want. Here's an example of desired result (Dash-delimited. Can't find a way to make it look nice, table tags don't seem to work here): (Sheet 1) Bob Smith - Group 1 (selected from dropdown) Joe Jones - Group 2 (selected from dropdown) Sally Sanderson - Group 1 (selected from dropdown) (Sheet 2) Group 1 - Bob Smith, Sally Sanderson (result of formula) Group 2 - Joe Jones (result of formula) What formula (or even what function) do I use on that second column of sheet 2 to make a flat list out of the members of that group?

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• Spring MVC vs raw servlets and template engine?

  - by Gigatron

  I've read numerous articles about the Spring MVC framework, and I still can't see the benefits of using it. It looks like writing even a simple application with it requires creating a big hodgepodge of XML files and annotations and other reams of code to conform to what the framework wants, a whole bunch of moving parts to accomplish a simple single task. Any time I look at a Spring example, I can see how I can write something with the same functionality using a simple servlet and template engine (e.g. FreeMarker, StringTemplate), in half the lines of code and little or no XML files and other artifacts. Just grab the data from the session and request, call the application domain objects if necessary, pass the results to the template engine to generate the resulting web page, done. What am I missing? Can you describe even one example of something that is actually made simpler with Spring than using a combination of raw servlets with a template engine? Or is Spring MVC just one of those overly complicated things that people use only because their boss tells them to use it?

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• Caching strategies for entities and collections

  - by Rob West

  We currently have an application framework in which we automatically cache both entities and collections of entities at the business layer (using .NET cache). So the method GetWidget(int id) checks the cache using a key GetWidget_Id_{0} before hitting the database, and the method GetWidgetsByStatusId(int statusId) checks the cache using GetWidgets_Collections_ByStatusId_{0}. If the objects are not in the cache they are retrieved from the database and added to the cache. This approach is obviously quick for read scenarios, and as a blanket approach is quick for us to implement, but requires large numbers of cache keys to be purged when CRUD operations are carried out on entities. Obviously as additional methods are added this impacts performance and the benefits of caching diminish. I'm interested in alternative approaches to handling caching of collections. I know that NHibernate caches a list of the identifiers in the collection rather than the actual entities. Is this an approach other people have tried - what are the pros and cons? In particular I am looking for options that optimise performance and can be implemented automatically through boilerplate generated code (we have our own code generation tool). I know some people will say that caching needs to be done by hand each time to meet the needs of the specific situation but I am looking for something that will get us most of the way automatically.

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• How to make the run button run the project, not the file, in Eclipse

  - by Roy T.

  I'm using the Spring IDE, a variant of Eclipse to create a Java project. One big irritation I have is that when I press the run button Eclipse tries to run the current file, which usually fails because it doesn't have a main method. I've set up run configurations in the hope that would make the play button default to the run configuration instead of the current file, but that doesn't work either. Now to run my application correctly I have to press the little arrow next to play, select my favorite run configuration and then it works, this is only two extra clicks but it's tedious, the button is small and I feel like I shouldn't have to perform these extra steps. I mean what is the point of run configurations and projects if it still tries to run a file by default? Even more preferably I wouldn't even want to touch the mouse but just press Ctrl+F11, but this has the same behavior. All above applies to debugging as well btw. So my question is this: how do I make the run and debug buttons (and their short keys) default to the project's run configuration instead of to trying (and failing) to run only the current file? Much like it is in Visual Studio and other IDEs?

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• How to choose an agile methodology?

  - by Christophe Debove

  I'm working in a little firm about 10 developpers, we are working a kind of agile way but knowledgeless and without formalism. I think be aware of what are agile method, what can they afford to us, may render more productive our products. However there is a lot of agile method, which could be the simplest to "learn"? Rapid Application Development Dynamic systems development method Scrum Feature Driven Development Extreme programming Adaptive software development Test Driven Development Crystal clear

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• When to write an explicit return statement in Groovy?

  - by Roland Schneider

  At the moment I am working on a Groovy/Grails project (which I'm quite new in) and I wonder whether it is good practice to omit the return keyword in Groovy methods. As far as I know you have to explicitly insert the keyword i.e. for guard clauses, so should one use it also everywhere else? In my opinion the additional return keyword increases readability. Or is it something you just have to get used to? What is your experience with that topic? Some examples: def foo(boolean bar) { // Not consistent if (bar) { return positiveBar() } negativeBar() } def foo2() { // Special Grails example def entitiy = new Entity(foo: 'Foo', bar: 'Bar') entity.save flush: true // Looks strange to me this way entity }

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• schedule compliance and keeping technical supports and resolving issues

  - by imays

  I am an entrepreneur of a small software developer company. The flagship product is developed by myself and my company grew up to 14 people. One of pride is that we've never have to be invested or loaned. The core development team is 5 people. 3 are seniors and 2 are juniors. After the first release, we've received many issues from our customers. Most of them are bug issues, customization needs, usage questions and upgrade requests. The issues from customers are incoming many times everyday, so it takes little time or much time of our developers. Because of our product is a software development kit(SDK) so most of questions can be answered only from our developers. And, for resolving bug issues, developers must be involved. Estimating time to resolve bug is hard. I fully understand it. However, our developers insist they cannot set the any due date of each project because they are busy doing technical supports and bug fixes by issues from customers everyday. Of course, they never do overwork. I suggested them an idea to divide the team into two parts: one for focusing on development by milestones, other for doing technical supports and bug fixes without setting due days. Then we could announce release plan officially. After the finish of release, two parts exchange the role for next milestone. However, they say they "NO, because it is impossible to share knowledge and design document fully." They still say they cannot set the release date and they request me to alter the due date flexibly. They does not fix the due date of each milestone. Fortunately, our company is not loaned and invested so we are not chocked. But I think it is bad idea to keep this situation. I know the story of ant and grasshopper. Our customers are tired of waiting forever of our release date. Companies consume limited time and money. If flexible due date without limit could be acceptable, could they accept flexible salary day? What is the root cause of our problem? All that I want is to fix and achieve precisely due date of each milestone without losing frequent technical supports. I think there must be solution for this situation. Please answer me. Thanks in advance. PS. Our tools and ways of project management are Trello, Mantis-like issue tracker, shared calendar software and scrum(collected cards into series of 'small and high completeness' projects).

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• Constructs for wrapping a hardware state machine

  - by Henry Gomersall

  I am using a piece of hardware with a well defined C API. The hardware is stateful, with the relevant API calls needing to be in the correct order for the hardware to work properly. The API calls themselves will always return, passing back a flag that advises whether the call was successful, or if not, why not. The hardware will not be left in some ill defined state. In effect, the API calls advise indirectly of the current state of the hardware if the state is not correct to perform a given operation. It seems to be a pretty common hardware API style. My question is this: Is there a well established design pattern for wrapping such a hardware state machine in a high level language, such that consistency is maintained? My development is in Python. I ideally wish the hardware state machine to be abstracted to a much simpler state machine and wrapped in an object that represents the hardware. I'm not sure what should happen if an attempt is made to create multiple objects representing the same piece of hardware. I apologies for the slight vagueness, I'm not very knowledgeable in this area and so am fishing for assistance of the description as well!

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• Thick models Vs. Business Logic, Where do you draw the distinction?

  - by TokenMacGuy

  Today I got into a heated debate with another developer at my organization about where and how to add methods to database mapped classes. We use sqlalchemy, and a major part of the existing code base in our database models is little more than a bag of mapped properties with a class name, a nearly mechanical translation from database tables to python objects. In the argument, my position was that that the primary value of using an ORM was that you can attach low level behaviors and algorithms to the mapped classes. Models are classes first, and secondarily persistent (they could be persistent using xml in a filesystem, you don't need to care). His view was that any behavior at all is "business logic", and necessarily belongs anywhere but in the persistent model, which are to be used for database persistence only. I certainly do think that there is a distinction between what is business logic, and should be separated, since it has some isolation from the lower level of how that gets implemented, and domain logic, which I believe is the abstraction provided by the model classes argued about in the previous paragraph, but I'm having a hard time putting my finger on what that is. I have a better sense of what might be the API (which, in our case, is HTTP "ReSTful"), in that users invoke the API with what they want to do, distinct from what they are allowed to do, and how it gets done. tl;dr: What kinds of things can or should go in a method in a mapped class when using an ORM, and what should be left out, to live in another layer of abstraction?

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• UML class diagram - can aggregated object be part of two aggregated classes?

  - by user970696

  Some sources say that aggregation means that the class owns the object and shares reference. Lets assume an example where a company class holds a list of cars but departments of that company has list of cars used by them. class Department { list<Car> listOfCars; } class Company { list<Car> listOfCars; //initialization of the list } So in UML class diagram, I would do it like this. But I assume this is not allowed because it would imply that both company and department own the objects.. [COMPANY]<>------[CAR] [DEPARTMENT]<>---| //imagine this goes up to the car class

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• A big flat text file or a HTML site for language documentation?

  - by Bad Sector

  A project of mine is a small embeddable Tcl-like scripting language, LIL. While i'm mostly making it for my own use, i think it is interesting enough for others to use, so i want it to have a nice (but not very "wordy") documentation. So far i'm using a single flat readme.txt file. It explains the language's syntax, features, standard functions, how to use the C API, etc. Also it is easy to scan and read in almost every environment out there, from basic text-only terminals to full-fledged high-end graphical desktop environments. However, while i tried to keep things nicely formatted (as much as this is possible in plain text), i still think that being a big (and growing) wall of text, it isn't as easy on the eyes as it could be. Also i feel that sometimes i'm not writing as much as i want in order to avoid expanding the text too much. So i thought i could use another project of mine, QuHelp, which is basically a help site generator for sites like this one with a sidebar that provides a tree of topics/subtopics and offline full text search. With this i can use HTML to format the documentation and if i use QuHelp for some other project that uses LIL, i can import LIL's documentation as part of the other project's documentation. However converting the existing documentation to QuHelp/HTML isn't a small task, especially when it comes to functions (i'll need to put more detail on them than what currently exists in the readme.txt file). Also it loses the wide range of availability that it currently has (even if QuHelp's generated code degrades gracefully down to console-only web browsers, plain text is readable from everywhere, including from popular editors such as Vim and Emacs - i had someone once telling me that he likes LIL's documentation because it is readable without leaving his editor). So, my question is simply this: should i keep the documentation as it is now in the form of a single readme.txt file or should i convert it to something like the site i mentioned above? There is also the option to do both, but i'm not sure if i'll be able to always keep them in sync or if it is worth the effort. After asking around in IRC i've got mixed answers: some liked the wide availability of the single text file, others said that it is looks as bad as a man page (personally i don't mind that - i can read man pages just fine - but other people might have issues reading them). What do you think?

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• Naming boolean field that is a verb

  - by dnhang

  In Java, by convention getter and setter for boolean fields will be isField() and setField(). This works perfectly fine with field names that are adjectives like active, visible, closed, etc. But how do I name a field that has meaning of a verb, like haveChildren? Add _ing to the verb (havingChildren), maybe? Edit: to clarify, I don't have control of the method names (getter and setter), they are auto-generated by the IDE. So what I need is an appropriate field name so that when the IDE generate a getter for it, it make senses. For example, hasChildren is a perfect field name, but when the IDE generate the getter for the field it would be isHasChildren. How do I solve this?

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• Design Patterns: Should I learn them?

  - by prelic

  So it's kinda weird asking two questions back-to-back, but they aren't very related and I didn't want to combine them, but I'm not spamming questions, I promise! Anyway, I'm a recent college grad, and my education only touched on design patterns...we implemented a few simple ones, touched on the fact that there were more complicated ones, and were instructed to turn to the GoF book if we wanted to learn more. My question is, is it worth learning the patterns in the GoF book? To me, it's always seemed counter-intuitive to try and make a problem fit a classic pattern, but obviously the book, and the patterns, are famous for a reason. Do they show up enough that I should be learning them? Thanks again!

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