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  • Algorithm to figure out appointment times?

    - by Rachel
    I have a weird situation where a client would like a script that automatically sets up thousands of appointments over several days. The tricky part is the appointments are for a variety of US time zones, and I need to take the consumer's local time zone into account when generating appointment dates and times for each record. Appointment Rules: Appointments should be set from 8AM to 8PM Eastern Standard Time, with breaks from 12P-2P and 4P-6P. This leaves a total of 8 hours per day available for setting appointments. Appointments should be scheduled 5 minutes apart. 8 hours of 5-minute intervals means 96 appointments per day. There will be 5 users at a time handling appointments. 96 appointments per day multiplied by 5 users equals 480, so the maximum number of appointments that can be set per day is 480. Now the tricky requirement: Appointments are restricted to 8am to 8pm in the consumer's local time zone. This means that the earliest time allowed for each appointment is different depending on the consumer's time zone: Eastern: 8A Central: 9A Mountain: 10A Pacific: 11A Alaska: 12P Hawaii or Undefined: 2P Arizona: 10A or 11A based on current Daylight Savings Time Assuming a data set can be several thousand records, and each record will contain a timezone value, is there an algorithm I could use to determine a Date and Time for every record that matches the rules above?

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  • Game works on netbeans but not outside netbeans in jar file?

    - by Michael Haywood
    I am creating a basic game of 'Pong'. I have finished the game apart from a few glitches I need to remove. The game runs perfectly in netbeans but if I create a jar file errors come up causing it to not work. I am quite new to java but I believe it is something to do with my code looking for the images but the images have not been loaded up yet. Here is the error. How can I get this to work outside of netbeans in a jar file? C:\Users\michael>java -jar "C:\Users\michael\Documents\NetBeansProjects\Pong\dis t\Pong.jar" Exception in thread "main" java.lang.NullPointerException at javax.swing.ImageIcon.<init>(Unknown Source) at pong.BallMainMenu.<init>(BallMainMenu.java:19) at pong.Board.gameInit(Board.java:93) at pong.Board.addNotify(Board.java:86) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at javax.swing.JRootPane.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at java.awt.Window.addNotify(Unknown Source) at java.awt.Frame.addNotify(Unknown Source) at java.awt.Window.show(Unknown Source) at java.awt.Component.show(Unknown Source) at java.awt.Component.setVisible(Unknown Source) at java.awt.Window.setVisible(Unknown Source) at pong.Pong.<init>(Pong.java:16) at pong.Pong.main(Pong.java:23)

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  • How to credit other authors in an open source project

    - by erik
    I have a pet project that I am planning to release as open source at some point in the not-too-distant future. A couple of the files use or are mostly code that was taken from a project released under the New BSD License. While I have changed it to fit my needs and added some small stuff, the algorithm and the functionality is basically exactly the same. I want to make sure that the author of the code gets credit and that the license is not broken, but I also want to make the reader aware that this is not the code as it was orignally released. How should I approach this? Should I isolate the code as much as possible and just retain the original license? Maybe put all the files that contain foreign code in their own folder and add a readme explaining what has been added/removed? There must have been tons of projects using other open source code. What is the standard approach to this?

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  • Looking for tips on managing complexity with SCM repositories

    - by Philip Regan
    I am a solo developer in my department and I have a lot of individual projects, all created and managed by me. I started using SVN at ProjectLocker via Versions on the Mac a couple years ago when the variety of projects started getting unwieldy. Scenario 1: Now I have a process that is of reasonable complexity it can be broken up into multiple smaller applications and they all share files. In one phase, there is a single shared file—a constants file—that is shared between a Cocoa app and an iPhone app framework. In the second phase, the iPhone app framework will be used to create individual apps of the same ilk—controller classes and what not will all be the same—but with different content in each. The problem that I am running across is that the file in the first phase is in one repository with the application that started it, and the app framework is in a second, separate repository. Scenario 2: I have another application framework that partially relies on code from an open source project. This is all internal, non-commerical work, but again, the application framework is going to be used to create a variety of unique products and processes. So, now I have an internally managed repository and an externally managed one out of my control. I make little changes to the open source code to meet the needs of my framework when there is an update I download, but I never commit back into the external repository (though, now that I think about it, I don't think I'm committing it to mine either. Oops). The Problem I have all of this set up on my production Mac quite nicely, but duplicating and subsequently maintaining that environment on my laptop has been challenging. For Scenario 1, I've thought of merging these two projects together into the same repository because they are, for all intents and purposes inextricably linked. But, Scenario 2, I think I'm stuck just managing files as best I can. The Question I'm wondering if anyone has any tips on how to manage either of these situations, as well as other complex SCM scenarios when it comes to linking various files from various repositories together. My familiarity with SVN only comes from my work with Versions. It's been great, but I'm a little out of my depth here.

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  • How is precedence determined in C pointers?

    - by ankur.trapasiya
    I've come across two pointer declarations that I'm having trouble understanding. My understanding of precedence rules goes something like this: Operator Precedence Associativity (), [ ] 1 Left to Right *, identifier 2 Right to Left Data type 3 But even given this, I can't seem to figure out how to evaluate the following examples correctly: First example float * (* (*ptr)(int))(double **,char c) My evaluation: *(ptr) (int) *(*ptr)(int) *(*(*ptr)(int)) Then, double ** char c Second example unsigned **( * (*ptr) [5] ) (char const *,int *) *(ptr) [5] *(*ptr)[5] *(*(*ptr)[5]) **(*(*ptr)[5]) How should I read them?

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  • How do you keep from running into the same problems over and over?

    - by Stephen Furlani
    I keep running into the same problems. The problem is irrelevant, but the fact that I keep running into is completely frustrating. The problem only happens once every, 3-6 months or so as I stub out a new iteration of the project. I keep a journal every time, but I spend at least a day or two each iteration trying to get the issue resolved. How do you guys keep from making the same mistakes over and over? I've tried a journal but it apparently doesn't work for me. [Edit] A few more details about the issue: Each time I make a new project to hold the files, I import a particular library. The library is a C++ library which imports glew.h and glx.h GLX redefines BOOL and that's not kosher since BOOL is a keyword for ObjC. I had a fix the last time I went through this. I #ifndef the header in the library to exclude GLEW and GLX and everything worked hunky-dory. This time, however, I do the same thing, use the same #ifndef block but now it throws a bunch of errors. I go back to the old project, and it works. New project no-worky. It seems like it does this every time, and my solution to it is new each time for some reason. I know #defines and #includes are one of the trickiest areas of C++ (and cross-language with Objective-C), but I had this working and now it's not.

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  • Is it more valuable to double major in Computer Science/Software Engineering or get an undergraduate CS degree with a Masters in SE?

    - by Austin Hyde
    A friend and I (both in college) are currently in a debate over which is better, in terms of employment opportunities, experience, and education: a Bachelors degree in both Computer Science and Software Engineering, or a Bachelors in Computer Science with a Masters in Software Engineering. My point of view is that I would rather go to school for 4-4.5 years to learn both sides of the field, and be out working on real projects gaining real experience, by going the double major route. His point of view is that it would look better to potential employers if he had a Bachelors in CS and Masters in SE. That way, when he's finally done after 4 years of CS and 2-4 of SE (depending on where he goes), he can pretty much have his choosing of what he wants to do. We are both in agreement on the distinction between the two degrees: CS is "traditional" and about the theory of algorithms, data structures, and programming, where SE is the study of the design of software and the implementation of CS theory. So, what's your stance on this debate? Have you gone one route or another? And most importantly, why?

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  • Architecture/pattern resources for small applications and tools

    - by s73v3r
    I was wondering if anyone had any resources or advice related to using architecture patterns like MVVM/MVC/MVP/etc on small applications and tools, as opposed to large, enterprisy ones. EDIT: Most of the information I see on application architecture is directed at large, enterprise applications. I'm just writing small programs and tools. As far as using these architecture patterns, is it generally worthwhile to go through the overhead of using an MVC/MVVM framework? Or would I be better off keeping it simple?

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  • What are the most important concepts to understand for "fluency in developer English"?

    - by Edward Tanguay
    In April, I'm going to be giving a talk called **English 2.0 - Understanding the Language of Developers" to a group of English teachers. The purpose is in two hours to give them a quick background in key concepts so that they can better understand developer blogs and podcasts and are able to ask better questions when talking to developers. What do you think are the most important concepts to understand, concepts that developers take for granted but the general public is not familiar with? Here are a few ideas: version control abstractions pub/sub push vs. pull debugging modularity three-tier architecture class/object "spaghetti code" vs. OOP exception throwing crowd sourcing refactoring the cloud DRY - don't repeat yourself client/server unit testing designer/developer

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  • How to design software when using BDD?

    - by Léster
    I'm working on a project right now and it's my first project using BDD. Up till now, the user stories have proven themselves a very valuable weapon to understand requirements and to specify the solution in a comprehensive, easy to understand language. My question is this: now that my user stories are complete, how do I design my solution? I understand that I derive behavior tests from my user stories, and I have to do UI design, but am I supposed to use good ol' UML? I'm under the impression that when using user stories, UML is left out; is this correct? Léster

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  • What is the point of the prototype method?

    - by Mild Fuzz
    I am reading through Javascript: The Good Parts, and struggled to get my head around the section on prototypes. After a little google, I came to the conclusion that it is to add properties to objects after the objects declaration. Using this script gleamed from w3schools, I noticed that removing the line adding the prototype property had no effect. So what is the point? //Prototyping function employee(name,jobtitle,born) { this.name=name; this.jobtitle=jobtitle; this.born=born; } var fred=new employee("Fred Flintstone","Caveman",1970); employee.prototype.salary=null; // <--- try removing this line fred.salary=20000; document.write(fred.salary);

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  • How to deal with different programming styles in a team?

    - by user3287
    We have a small dev team (only 3 developers) and we recently got a new team member. While he is a smart coder, his coding style is completely different from ours. Our existing code base contains mostly readable, clean and maintainable code, but the new team member is quickly changing many files, introducing ugly hacks and shortcuts, using defines all over the place, adding functions in the wrong places, etc. My question is if others have experienced such a situation before, and if anyone has tips on how to talk to him.

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  • Which of these design patterns is superior?

    - by durron597
    I find I tend to design class structures where several subclasses have nearly identical functionality, but one piece of it is different. So I write nearly all the code in the abstract class, and then create several subclasses to do the one different thing. Does this pattern have a name? Is this the best way for this sort of scenario? Option 1: public interface TaxCalc { String calcTaxes(); } public abstract class AbstractTaxCalc implements TaxCalc { // most constructors and fields are here public double calcTaxes(UserFinancials data) { // code double diffNumber = getNumber(data); // more code } abstract protected double getNumber(UserFinancials data); protected double initialTaxes(double grossIncome) { // code return initialNumber; } } public class SimpleTaxCalc extends AbstractCalc { protected double getNumber(UserFinancials data) { double temp = intialCalc(data.getGrossIncome()); // do other stuff return temp; } } public class FancyTaxCalc extends AbstractTaxCalc { protected double getNumber(UserFinancials data) { int temp = initialCalc(data.getGrossIncome()); // Do fancier math return temp; } } Option 2: This version is more like the Strategy pattern, and should be able to do essentially the same sorts of tasks. public class TaxCalcImpl implements TaxCalc { private final TaxMath worker; public DummyImpl(TaxMath worker) { this.worker = worker; } public double calcTaxes(UserFinancials data) { // code double analyzedDouble = initialNumber; int diffNumber = worker.getNumber(data, initialNumber); // more code } protected int initialTaxes(double grossIncome) { // code return initialNumber; } } public interface TaxMath { double getNumber(UserFinancials data, double initial); } Then I could do: TaxCalc dum = new TaxCalcImpl(new TaxMath() { @Override public double getNumber(UserFinancials data, double initial) { double temp = data.getGrossIncome(); // do math return temp; }); And I could make specific implementations of TaxMath for things I use a lot, or I could make a stateless singleton for certain kinds of workers I use a lot. So the question I'm asking is: Which of these patterns is superior, when, and why? Or, alternately, is there an even better third option?

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  • Interviews by Software Companies

    - by Glenn Nelson
    I have been chosen as one of the 12 final people for a full out scholarship to the college of my choice and it is paid for by a software company so long as I major in Computer Science.I have already had to write an essay on what has most shaped my life (Programming being it) and that was the basis for the interview decision. I now have to go in for an interview with people from the company for the final decision in a week. I do believe I have a good foundation in computer science already. I have roughly 4 years of programming experience in Java, C++, ASM and your typical web stuff. I have done everything from making my own CMS for my site to an assembler to network file transfer applications. That said what types of questions should I expect in an interview of this sort? Do I seem reasonably knowledgeable?

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  • Open Source Web-based CMS for writing and managing API documentation

    - by netcoder
    This is a question that have somewhat been asked before (i.e.: How to manage an open source project's documentation). However, my question is a little different because: We're not developing open source software, but proprietary software The documentation has to be hand-written, because we do not want to publish the actual software API documentation, but only the public API documentation I do want developers and project managers to write the documentation collaboratively Obviously, wikis are a solution, but they're very generic. I'm looking for a more specialized tool for this job. I've looked around and found a few like Adobe Robohelp, SaaS solutions and such, but I'd like to know if any open source software exists for that purpose. Do you know any Open Source Web-based CMS for writing and managing API and software documentation?

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  • A good substitute for ASMX web service methods, but not a general handler

    - by Saeed Neamati
    The best thing I like about ASP.NET MVC, is that you can directly call a server method (called action), from the client. This is so convenient, and so straightforward, that I really like to implement such a model in ASP.NET WebForms too. However, in ASP.NET WebForms, to call a server method from the client, you should either use Page Methods, or Web Services, both of which use SOAP as their communication protocol (though JSON can also be used). There is also another substitution, which is using Generic Handlers. The problem with them however is that, a separate Generic Handler should be written for each server method. In other words, each Generic Handler works like a simple method. Is there anyway else to imitate MVC model in ASP.NET WebForms? Please note that I can't change to MVC platform right now, cause the project at our hand is a big project and we don't have required resources and time to change our platform. What we seek, is a simple MVC model implementation for our AJAX calls. A problem that we have with Web Services, is the known problem of SoapException, and we're not interested in creating custom SoapExctensions.

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  • How can I unit test a class which requires a web service call?

    - by Chris Cooper
    I'm trying to test a class which calls some Hadoop web services. The code is pretty much of the form: method() { ...use Jersey client to create WebResource... ...make request... ...do something with response... } e.g. there is a create directory method, a create folder method etc. Given that the code is dealing with an external web service that I don't have control over, how can I unit test this? I could try and mock the web service client/responses but that breaks the guideline I've seen a lot recently: "Don't mock objects you don't own". I could set up a dummy web service implementation - would that still constitute a "unit test" or would it then be an integration test? Is it just not possible to unit test at this low a level - how would a TDD practitioner go about this?

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  • Who determines what is best practice? [closed]

    - by dreza
    I've often searched for answers relating to "best practice" when writing code. And I see many questions regarding what is best practice. However, I was thinking the other day. Who actually determines what this best practice is? Is it the owners or creators of the programming language. Is it the general developer community that is writing in the language and it's just a gut feeling consensus. Is it whoever seems to have the highest prestige in the developer world and shouts the loudest? Is best practice really just another term for personal opinion? I hope this is a constructive question. If I could word it better to ensure it doesn't get closed please feel free to edit, or inform me otherwise.

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  • How to get paid and figure out if I want to keep this client [migrated]

    - by Heiner Fawkes
    I have a client who is not paying on time, but it looks like the specifics don't match similar questions on this SE site. I got a call from a client I did website work for years ago. I had not done this kind of work for many years and frankly I'm not sure I want to now, but nevertheless about a month ago I agreed to bring his website, SEO, social media, and overall marketing for his small business up to speed. Why? He has told me many times how I'm the most honest, most well-informed contractor he's had experience with. And I personally kind of like him too. So I started working on an hourly basis. I sent one very small invoice and got paid. Then we talked a whole lot about all sorts of feature he would like me to implement. I started that work, and sent a second invoice on the first of the month (one of my two stated billing days). I didn't get paid. On every invoice it states that I charge a whopping ten percent per week late. I sent many voicemails and emails asking to please let me know what's going on with payment, and didn't get replies. Then the 15th of the month rolled around (which I stated initially as one of my invoicing dates). Since I hadn't been paid for the last invoice, I simply didn't send him an invoice at that time but emailed him and said that I will combine it with the next scheduled invoice for this reason (probably a bad idea I realize). Eventually he sent a portion of the invoice payment. I emailed back to let him know that he's three weeks late and what the remaining balance is. Finally we got in touch via phone. He basically told me that he thought I hadn't done all of the work I said I did. He looked at the page source code and it didn't look complete to him. I explained why his perception would be different and what work I had done as specified. He accepted this and said that part of the reason he didn't pay in full is that he's been swamped with personal family stuff, and part of the reason is that he didn't think I did all the work. That struck me as pretty weird. He also expressed concern that he has no idea now how much all the changes he has asked for are going to cost. And once again, he told me how honest and high-quality my services are compared to others he has dealt with. He also said he would pay me more (but not all) of the now three weeks overdue invoice that day. I didn't receive any payment. Basically this is how the client relationship strikes me: He's not good at communication. He's very busy and English isn't his first language. He almost never replies to emails but phone calls are fine. He's asked me to avoid emails for communication and I've asked him to please use email. He might not have enough money to afford all the things he has asked for. But so far I have been working for an hourly fee (which is quite high). He also has started paying monthly for hosting and social media services from me. What seems very abnormal is for a client to be so overdue on payments and to actually withhold payment of an invoice without any communication because he didn't think the work was done. I told him that I will send dollar estimates of each module of remaining work so that we can decide which ones are the highest priority if he cannot afford them all. I also reiterated that in the future if he has doubts about the work or an inability to pay, he must contact me immediately to say so. I basically plan to state the following to him: I would like to work for him and help his business. I also have sympathy for his recent family difficulties. I am happy to figure out payment plans that would work better for him, but first I need to be paid in full for all outstanding invoices, especially given that I skipped one of them just to be nice. The most crucial thing I need is communication about any problems with my work or his ability to pay. Once again, he heeds to pay in full immediately before we negotiate anything else. Does the above seem like an appropriate communication? Is anything missing from it? Is anything I'm doing here really abnormal?

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  • How to send credentials to linkedIn website and get oauth_verifier without signing in again [closed]

    - by akash kumar
    I am facing a problem sending credentials to another website so that I can login the user (automatically, not clicked on sign in here) and get an oauth_verifier value. I want to send the email address and the password through a form (submit button) from my website (e.g. a Liferay portal) to another website (e.g. LinkedIn), so that it automatically returns an oauth_verifier to my website. That means I don't want the user of my website to submit his email and password to LinkedIn again. My goal is to take the email and password of the user in my website and show the user his LinkedIn connection, message, job posting (again, in my website, not LinkedIn). I dont want the user redirected to the LinkedIn website to sign in there and then come back to my website. I have taken a consumer key and a secret key from LinkedIn for my web aplication. I am using the LinkedIn API and getting oauth_verifier for access token but in order to login, I have to take user to LinkedIn to sign in, while I want it to happen in the backend.

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  • Is "no installation" software a good thing?

    - by Yaron Naveh
    I am building an application that will, hopefully, be used by developers. To be appealing to developers I want it to be lightweight, small in size, and with no installation (e.g. xcopy). I trust more an application without installation to not put garbage in my registry, to be lightweight etc. My friend thinks the opposite: An installer puts shortcuts on the desktop / menu for me, it ensures cleanup via the uninstaller, and seems more official. I'm curious - what is everyone's take on this?

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  • Why is CSS3 doing animations?

    - by Joseph the Dreamer
    Like what the title says, why are there animations in CSS3? With basis from the "rule" of separation of concerns, HTML is the content, CSS is the style, and JavaScript is the interactive component. And by interactivity, one can conclude that anything moving due to any interaction, user or non-user triggered should be covered by JavaScript, not CSS. So why did they make CSS3 capable of doing animations? Doesn't it breach the rule, which is separation of concerns? Is there anything I missed that makes animations qualified to be classified as styles rather than interaction?

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  • What is the ideal length of a method?

    - by iPhoneDeveloper
    In object-oriented programming, there is no exact rule on the maximum length of a method , but I still found these two qutes somewhat contradicting each other, so I would like to hear what you think. In Clean Code: A Handbook of Agile Software Craftsmanship, Robert Martin says: The first rule of functions is that they should be small. The second rule of functions is that they should be smaller than that. Functions should not be 100 lines long. Functions should hardly ever be 20 lines long. and he gives an example from Java code he sees from Kent Beck: Every function in his program was just two, or three, or four lines long. Each was transparently obvious. Each told a story. And each led you to the next in a compelling order. That’s how short your functions should be! This sounds great, but on the other hand, in Code Complete, Steve McConnell says something very different: The routine should be allowed to grow organically up to 100-200 lines, decades of evidence say that routines of such length no more error prone then shorter routines. And he gives a reference to a study that says routines 65 lines or long are cheaper to develop. So while there are diverging opinions about the matter, is there a functional best-practice towards determining the ideal length of a method for you?

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  • Separating a "wad of stuff" utility project into individual components with "optional" dependencies

    - by romkyns
    Over the years of using C#/.NET for a bunch of in-house projects, we've had one library grow organically into one huge wad of stuff. It's called "Util", and I'm sure many of you have seen one of these beasts in your careers. Many parts of this library are very much standalone, and could be split up into separate projects (which we'd like to open-source). But there is one major problem that needs to be solved before these can be released as separate libraries. Basically, there are lots and lots of cases of what I might call "optional dependencies" between these libraries. To explain this better, consider some of the modules that are good candidates to become stand-alone libraries. CommandLineParser is for parsing command lines. XmlClassify is for serializing classes to XML. PostBuildCheck performs checks on the compiled assembly and reports a compilation error if they fail. ConsoleColoredString is a library for colored string literals. Lingo is for translating user interfaces. Each of those libraries can be used completely stand-alone, but if they are used together then there are useful extra features to be had. For example, both CommandLineParser and XmlClassify expose post-build checking functionality, which requires PostBuildCheck. Similarly, the CommandLineParser allows option documentation to be provided using the colored string literals, requiring ConsoleColoredString, and it supports translatable documentation via Lingo. So the key distinction is that these are optional features. One can use a command line parser with plain, uncolored strings, without translating the documentation or performing any post-build checks. Or one could make the documentation translatable but still uncolored. Or both colored and translatable. Etc. Looking through this "Util" library, I see that almost all potentially separable libraries have such optional features that tie them to other libraries. If I were to actually require those libraries as dependencies then this wad of stuff isn't really untangled at all: you'd still basically require all the libraries if you want to use just one. Are there any established approaches to managing such optional dependencies in .NET?

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  • Auto update for application hosted on multiple servers on cloud

    - by mots_g
    I'm working on an application which will run on multiple Amazon EC2 instances. I wish to incorporate auto update feature for my application. The updater should update all the Ec2 instances. Also, there is a central server which governs the creation/termination of EC2 instances as per load. The central server creates a EC2 new instance from a pre-configured custom AMI (custom image which has our application pre-installed). Also, once there is an update, the pre-configured AMI needs to be updated too else it would create new instances which are not updated. Should the central server notify all the ec2 instances for an update and then the instances update themselves?Or should the application on Ec2 instance have a check for periodically updating themselves? Also how should the Amazon custom AMI be updated? Should a new instance be created from it, updated and then a new AMI be re-created and then new images be created from this AMI? What is the best way to incorporate an auto update feature for this architecture? The central server is written in Java and the application running on the cloud is written in C++. Is there a good framework available that can be used for this architecture? Please let me know on what I could be missing in the design and how it would help me to have a nice, extensible and fail safe auto update architecture. Thanks

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