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  • How to define AUTHPARAMS in Amazon EC2 API call

    - by The Joker
    I am trying to make an API call to EC2. I want to add my IP address to the security group. https://ec2.amazonaws.com/ ?Action=AuthorizeSecurityGroupIngress &GroupName=grppp20 &GroupId=sg-b2z982mq &IpPermissions.1.IpProtocol=tcp &IpPermissions.1.FromPort=3389 &IpPermissions.1.ToPort=3389 &IpPermissions.1.IpRanges.1.CidrIp=22.951.17.728/32 &&AWSAccessKeyId=AOPLDRACULALK6U7A And i get the following error. AWS was not able to validate the provided access credentials I have a secret access key & a username. I searched internet & found that we have to make a signature of the secret key & use it in the request instead of adding it directly. Can anyone tell me how to make a signature of my AWS secret key & how to use them with my API call? Let my secret key be: 2WwRiQzBs7RTFG4545PIOJ7812CXZ Username: thejoker

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  • Understanding and developing web services

    - by Pankaj Upadhyay
    This question is in conjuction with How would you approach developing a Hotel Reservation System? The solution to a system with different interfaces(or clients i should say) is to go with developing a Web service and have other systems interact with it. I never had the requirement for developing a Web service so i am bit short on it. All i understand is that A web service is a system or application that performs some operations which may include modifying, sending or receiving data over a network using HTTP protocol. (Let me know if the understanding is wrong) Now, from the other question it's clearly understood that i need to develop a web service but i have no idea as to how should i go about it. My language of choice is C# and .NET Framework. Question:: How do we develop a webservice and which tools,technology and framework should i use for the same using C# language?? Question:: How can i interact with this from a desktop WPF application, Website and Mobile app

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  • What are some ramifications of open source software turning into closed source software? [on hold]

    - by Verrier
    If a company takes a permissively licensed open source application and then develops a closed source application from that by reworking extensive parts of the application, adding new features and applying bug fixes... Ignoring any license requirements... How does the transition happen and what can be done to prevent it beyond choosing a difference license? What are the (ethical or social) responsibilities for the company? (For example: Giving back to the open source project would be the ethical thing to do) If the open source version and closed source version are both available, how does the competition affect either product? Are there any examples of companies or products that have done this (either successfully or unsuccessfully) in the past? What was the community attitude toward those projects?

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  • Specialized course in Web programming or Generalized course in Computer Science?

    - by Sugan
    I am planning to do my masters in Computer Science in UK. I am interested in Web programming. What should I opt for. A general course in Computer Science or in some specialized course in Web Programming. If web programming, are there a lot of colleges offering these courses. Are there a lot of job offers there in UK. I am not sure whether I can ask this question here. If not point me where I can ask this question.

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  • Quality Assurance & Quality Control = verification & validation?

    - by user970696
    According to a book (page below), reviewing e.g. design (verification activity) is quality assurance. I would not agree, I would say its quality control because we are checking the conformance to specification, plans and detecting deviations (defects) as we do in quality control. But what would be an example of QA then? Could you give me a clear example that proves/disproves what is this book saying? Software Testing: Srinisvasan Desikan, Gopalaswamy Ramesh

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  • How to capitalize maximally on location-independence … my personal #1-incentive for working as a developer

    - by SomeGuy
    To me the ultimate beauty in working as a developer is the fact that given a nice CV, your are going to find a new job, everywhere at any time. So I would like to ask if somebody here as experience in working while travelling for example. Or job-hopping from metropolis to metropolis every, say, six months. For example I have been investigating for how to get to Brazil. But it seems like that working as an employee in Brazil would be no option, b/c it takes a lot of time/money/effort to get the proper visas and permissions. So the only practical solution would be to freelance and the just travel, while getting your job done wherever you are. I bet my ass that there are loads of IT-guys out there and on here who know exactly what I am talking about. I'm looking forward to interesting ideas and stories.

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  • Idea to develop a caching server between IIS and SQL Server

    - by John
    I work on a few high traffic websites that all share the same database and that are all heavily database driven. Our SQL server is max-ed out and, although we have already implemented many changes that have helped but the server is still working too hard. We employ some caching in our website but the type of queries we use negate using SQL dependency caching. We tried SQL replication to try and kind of load balance but that didn't prove very successful because the replication process is quite demanding on the servers too and it needed to be done frequently as it is important that data is up to date. We do use a Varnish web caching server (Linux based) to take a bit of the load off both the web and database server but as a lot of the sites are customised based on the user we can only do so much. Anyway, the reason for this question... Varnish gave me an idea for a possible application that might help in this situation. Just like Varnish sits between a web browser and the web server and caches response from the web server, I was wondering about the possibility of creating something that sits between the web server and the database server. Imagine that all SQL queries go through this SQL caching server. If it's a first time query then it will get recorded, and the result requested from the SQL server and stored locally on the cache server. If it's a repeat request within a set time then the result gets retrieved from the local copy without the query being sent to the SQL server. The caching server could also take advantage of SQL dependency caching notifications. This seems like a good idea in theory. There's still the same amount of data moving back and forward from the web server, but the SQL server is relieved of the work of processing the repeat queries. I wonder about how difficult it would be to build a service that sort of emulates requests and responses from SQL server, whether SQL server's own caching is doing enough of this already that this wouldn't be a benefit, or even if someone has done this before and I haven't found it? I would welcome any feedback or any references to any relevant projects.

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  • Improving the performance of a db import process

    - by mmr
    I have a program in Microsoft Access that processes text and also inserts data in MySQL database. This operation takes 30 mins or less to finished. I translated it into VB.NET and it takes 2 hours to finish. The program goes like this: A text file contains individual swipe from a corresponding person, it contains their id, time and date of swipe in the machine, and an indicator if it is a time-in or a time-out. I process this text, segregate the information and insert the time-in and time-out per row. I also check if there are double occurrences in the database. After checking, I simply merge the time-in and time-out of the corresponding person into one row only. This process takes 2 hours to finished in VB.NET considering I have a table to compare which contains 600,000+ rows. Now, I read in the internet that python is best in text processing, i already have a test but i doubt in database operation. What do you think is the best programming language for this kind of problem? How can I speed up the process? My first idea was using python instead of VB.NET, but since people here telling me here on SO that this most probably won't help I am searching for different solutions.

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  • Learning MVC for a JSP Resource and ASP.Net WebForms Resource

    - by Lijo
    Statement from a colleque: - "People with ASP.Net WebForms skills should be able to learn it easily as the fundamental concept is same.” Consider two people –one from JSP background and other from ASP.Net WebForms background. Now both need to learn ASP.Net MVC in RAZOR. Do you think the person from ASP.Net Webforms background has significant advantage over the person from JSP background? My feeling is – it is equally difficult for JSP person and ASP.Net Webforms person to learn MVC with RAZOR. What is your take on it? Any statistics that you can provide for this?

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  • How to be up to date with the LAMP platform?

    - by Shakti Singh
    Most of times I get to know about the new features from my colleagues or someone else. It is okay at least I know about them does not matter from where I know But I feel it is too late to know about those features. I am working on LAMP platform and I want to keep myself up to date with the new things, anything happening new with LAMP. Can you please let me know what resources should I use? What groups should I follow? From where I can get the latest updates about any activity, event and feature about LAMP?

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  • Git branching and tagging best practices

    - by Code-Guru
    I am currently learning to use Git by reading Pro Git. Right now I'm learning about branching and tags. My question is when should I use a branch and when should I use a tag? For example, say I create a branch for version 1.1 of a project. When I finish and release this version, should I leave the branch to mark the release version? Or should I add a tag? If I add a tag, should I delete the version branch (assuming that it is merged into master or some other branch)?

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  • Will JVisualVM degrade application performance?

    - by rocky
    I have doubts in JVisual VM profiler tool related to performance. I have requirement to implement a JVM Monitoring tool for my enterpise java application. I have gone through some profiling tools in market but all them are having some kind of agent file which we need include in server startup. I have a fear that these client agent will degrade my application performance will more. So I have decided to JVisual VM because this profiler tool comes with JDK itself but before implementing JVisualVM, does anybody faces any issues with JVisualVM profiler tool? As well as, is this safe if I implement in application?

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  • What can Go chan do that a list cannot?

    - by alpav
    I want to know in which situation Go chan makes code much simpler than using list or queue or array that is usually available in all languages. As it was stated by Rob Pike in one of his speeches about Go lexer, Go channels help to organize data flow between structures that are not homomorphic. I am interested in a simple Go code sample with chan that becomes MUCH more complicated in another language (for example C#) where chan is not available. I am not interested in samples that use chan just to increase performance by avoiding waiting of data between generating list and consuming the list (which can be solved by chunking) or as a way to organize thread safe queue or thread-safe communication (which can be easily solved by locking primitives). I am interested in a sample that makes code simpler structurally disregarding size of data. If such sample does not exist then sample where size of data matters. I guess desired sample would contain bi-directional communication between generator and consumer. Also if someone could add tag [channel] to the list of available tags, that would be great.

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  • Manage ClickOnce releases for different parties

    - by Dirk Beckmann
    I'm struggling with release management of a piece of software. First some general information: It is a ClickOnce application I follow the release often practice There are about 30 parties served with this software I need full control which update will be delivered to which party Not each party is allowed to get the latest update/release Each party has multiple clients that are all allowed to get the latest update, served for the specific party So that's what my requirements are in a rough description. So let me explain what I was thinking about how to solve this. I would like to create a "deployment" website (asp.net) that will handle all the requests There are two endpoints one for download the client and one where the client checks for updates So each party has a separate endpoint like DeploymentSite/party1 and another for DeploymentSite/party2 The Application Files should still be stored centralized So I thought it would be manageable with mage.exe with the following steps Build application and store new release into Application Files Repository/Folder Get parties that should be updated (config file, database what ever) Run mage.exe to create a new application and deployment manifest for each party in the update list with new Application File Location (1.0.2) Actually I'm really struggling with this mage.exe staff. I can't create the appropriate files with the needed codebase. How to handle thes requirements?

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  • Tool to identify (and remove) unnecessary website files?

    - by xanadont
    Inevitably I'll stop using an antiquated css, script, or image file. Especially when a separate designer is tinkering with things and testing out a few versions of images. Before I build one myself, are there any tools out there that will drill through a website and list unlinked files? Specifically, I'm interested in ASP.NET MVC sites, so detecting calls to (and among many other things) @Url.Content(...) is important.

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  • Why doesn't Gradle include transitive dependencies in compile / runtime classpath?

    - by Francis Toth
    I'm learning how Gradle works, and I can't understand how it resolves a project transitive dependencies. For now, I have two projects : projectA : which has a couple of dependencies on external libraries projectB : which has only one dependency on projectA No matter how I try, when I build projectB, gradle doesn't include any projectA dependencies (X and Y) in projectB's compile or runtime classpath. I've only managed to make it work by including projectA's dependencies in projectB's build script, which, in my opinion does not make any sense. These dependencies should be automatically attached to projectB. I'm pretty sure I'm missing something but I can't figure out what. I've read about "lib dependencies", but it seems to apply only to local projects like described here, not on external dependencies. Here is the build.gradle I use in the root project (the one that contains both projectA and projectB) : buildscript { repositories { mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:0.3' } } subprojects { apply plugin: 'java' apply plugin: 'idea' group = 'com.company' repositories { mavenCentral() add(new org.apache.ivy.plugins.resolver.SshResolver()) { name = 'customRepo' addIvyPattern "ssh://.../repository/[organization]/[module]/[revision]/[module].xml" addArtifactPattern "ssh://.../[organization]/[module]/[revision]/[module](-[classifier]).[ext]" } } sourceSets { main { java { srcDir 'src/' } } } idea.module { downloadSources = true } // task that create sources jar task sourceJar(type: Jar) { from sourceSets.main.java classifier 'sources' } // Publishing configuration uploadArchives { repositories { add project.repositories.customRepo } } artifacts { archives(sourceJar) { name "$name-sources" type 'source' builtBy sourceJar } } } This one concerns projectA only : version = '1.0' dependencies { compile 'com.company:X:1.0' compile 'com.company:B:1.0' } And this is the one used by projectB : version = '1.0' dependencies { compile ('com.company:projectA:1.0') { transitive = true } } Thank you in advance for any help, and please, apologize me for my bad English.

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  • Python and only Python for almost any programming tasks!

    - by Wassim
    Am I wrong if I think that Python is all I need to master, in order to solve most of the common programming tasks? EDIT I'm not OK with learning new programming languages if they don't teach me new concepts of programming and problem solving; hence the idea behind mastering a modern, fast evolving, with a rich set of class libraries, widely used and documented, and of course has a "friendly" learning curve programming language. I think that in the fast evolving tech industry, specialization is key to success.

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  • UI message passing programming paradigm

    - by Ronald Wildenberg
    I recently (about two months ago) read an article that explained some user interface paradigm that I can't remember the name of and I also can't find the article anymore. The paradigm allows for decoupling the user interface and backend through message passing (via some queueing implementation). So each user action results in a message being pased to the backend. The user interface is then updated to inform the user that his request is being processed. The assumption is that a user interface is stale by definition. When you read data from some store into memory, it is stale because another transaction may be updating the same data already. If you assume this, it makes no sense to try to represent the 'current' database state in the user interface (so the delay introduced by passing messages to a backend doesn't matter). If I remember correctly, the article also mentioned a read-optimized data store for rendering the user interface. The article assumed a high-traffic web application. A primary reason for using a message queue communicating with the backend is performance: returning control to the user as soon as possible. Updating backend stores is handled by another process and eventually these changes also become visible to the user. I hope I have explained accurately enough what I'm looking for. If someone can provide some pointers to what I'm looking for, thanks very much in advance.

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  • /planes and /clubs or /wiki/planes and /wiki/clubs

    - by Jelmer
    I am currently working on a nice application about which I can't share all the details, but it will have some sort of a wiki part. In this wiki, you will be able to change the planes as well as the clubs, maybe in the future it will be possible to change the countries and manufacturers as well. But I have to think about this and I have to check how good this is. But, you will understand that it has to be expendable! That is really important. Use the planes controller with a edit page and the same for the clubs Route the planes and clubs controller to the wiki controller, so we have 1 nice "path" to edit this stuff. I want to have it called wiki that is for sure. Because that is what it is, but I am storing the planes and clubs data in its down table in my database. I think that is kinda obvious since it has to be maintainable. Right now you could edit a plane via the url: example.com/wiki/planes/edit/Duo_Discus.html Do you think that is better than example.com/planes/edit/Duo_Discus.html since it is easy to understand for the user, that he is working in the wiki instead of in the planes ? Or do you think this will break the user experience?

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  • Visio Architecture Diagram [closed]

    - by Mike
    I am using Visio to create an architecture diagram similar to the following Windows block diagram: Are there components available in Visio to make a diagram like this? I can do it manually by using the open/closed bar shape from Blocks and then adding the text as textboxes but it means I have to worry about sizing/offsetting text for each black box. Is anyone aware of whether there is some built-in shape already for this?

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  • Help with algorithmic complexity in custom merge sort implementation

    - by bitcycle
    I've got an implementation of the merge sort in C++ using a custom doubly linked list. I'm coming up with a big O complexity of n^2, based on the merge_sort() slice operation. But, from what I've read, this algorithm should be n*log(n), where the log has a base of two. Can someone help me determine if I'm just determining the complexity incorrectly, or if the implementation can/should be improved to achieve n*log(n) complexity? If you would like some background on my goals for this project, see my blog. I've added comments in the code outlining what I understand the complexity of each method to be. Clarification - I'm focusing on the C++ implementation with this question. I've got another implementation written in Python, but that was something that was added in addition to my original goal(s).

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  • Computer Science Degree or Computer Engineering Degree?

    - by Paul
    Hello everyone, I'm 23 years old living in Italy and this year I will be getting my high school diploma. I'm interested in pursuing a collage degree and work in the IT field. At the moment I'm self teaching myself Java (I also know python, html, css and mysql). I'm also learning about algorithms and OO design. I'm curious how important a college degree is for me, considering my age and if there is a big difference between computer science and computer engineer. There is a computer science university where I currently live but not a computer engineer one. For some reason universities that offer computer engineering courses are only in bigger cities such as Milan, Bologna, Roma. Cost wise, it would be cheaper for me to study near home at a computer science school. Career wise, would a computer engineering university offer me more work opportunities instead of a computer science degree ? Is it easier transiting from CS to CEN or vice-versa? I'm not exactly sure what type of job I want to pursue in the future since I'm still a bit undecided but definitely not system/network administrator, database administrator, game developer.

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  • How to avoid general names for abstract classes?

    - by djechlin
    In general it's good to avoid words like "handle" or "process" as part of routine names and class names, unless you are dealing with (e.g.) file handles or (e.g.) unix processes. However abstract classes often don't really know what they're going to do with something besides, say, process it. In my current situation I have an "EmailProcessor" that logs into a user's inbox and processes messages from it. It's not really clear to me how to give this a more precise name, although I've noticed the following style matter arises: better to treat derived classes as clients and named the base class by the part of the functionality it implements? Gives it more meaning but will violate is-a. E.g. EmailAcquirer would be a reasonable name since it's acquiring for the derived class, but the derived class won't be acquiring for anyone. Or just really vague name since who knows what the derived classes will do. However "Processor" is still too general since it's doing many relevant operations, like logging in and using IMAP. Any way out of this dilemma? Problem is more evident for abstract methods, in which you can't really answer the question "what does this do?" because the answer is simply "whatever the client wants."

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  • Should MVVM ViewModel inject an HTML template for default view?

    - by explunit
    I'm working on web application design that includes Knockout.js and have an overall MVVM question: Does it make sense for the ViewModel to automatically inject a default HTML template (pulled from separate file)? More detail: suppose I have a site like this... header... widget 1 widget 2 widget 3 footer ...and widgets 1/2/3 are going to be Knockout.js ViewModels determined at runtime from an overall list of available widgets, each with associated HTML template file. I understand that in MVVM you want the view (HTML template in this case) to be separate from the ViewModel (Javascript file in this case) so that people can edit it separately and possibly provide multiple templates for different "skins". However, it seems like it would also make sense for the ViewModel to point to a default html template that gets automatically used unless the controlling code provides a different one. Am I looking at this correctly? As an example, see this answer on StackOverflow where he recommends injecting the HTML and then the ViewModel. Seems like a one-liner would make more sense in that case, with the possibility of overriding a default template value.

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  • Role of Sharepoint experience in career growth

    - by Syed Ibrahim
    I am from India. I was a Mainframe developer for first 2 years of my IT career and then shifted to Microsoft .Net and completed 3 years as of now. In these 3 years as a .Net developer i have worked only in core .Net skills like Asp .Net, Sql Server with C# .Net. I never worked in advance skills like Web Services or WCF or silverlight etc. In current world market scenario, I feel Sharepoint experience weighs more than the WCF, Web Services work experience for a .Net Developer.(Please correct if wrong). So i am planning to study Sharepoint through some training centre and complete a Sharepoint certification. The main reason for me to go for Sharepoint is that i feel it is a niche skill and it will help me to get a job in abroad location in future. Please let me know whether sharepoint can help me to get a job in foreign location. I would also like to know whether, Is it possible to master Sharepoint without any experience in skills like WCF, Web Services etc? Is it possible to get a sharepoint job just with knowledge and certification in it? Incase if sharepoint will not offer me career growth, then can you please suggest me the skills which will offer great career growth (like foreign jobs) for me as a .Net developer?

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