instruction stringlengths 34 19.9k |
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I've stumbled upon this problem when tried to run our application in bad network conditions; it spawns hundreds of threads (which exist long time before termination), and with time the application crashes. However, other developers answered this is "not a bug" and "as designed".
I have a strong gut feeling that spawnin... |
In general, how do I decide whether to use make a class a super class, or to make it a private data member of another class? For example, given two classes, how does one decide whether to do this:
public class Sprite {
private BaseImage image;
...
or this:
public class Sprite extends BaseImage {
...
Funct... |
In a nutshell, should we design death into our programs, processes, and threads at a low level, for the good of the overall system?
Failures happen. Processes die. We plan for disaster and occasionally recover from it. But we rarely design and implement unpredictable program death. We hope that our services' uptimes ar... |
So, I've been evaluating Entity Framework and NHibernate (I'm not looking for an EF vs. NH battle here, though!).
One thing that I see come up very often is that NHibernate is recommended for "legacy"/brownfield database projects, and lighter-weight ORMs (Dapper, etc) are sometimes recommended for newer dbs.
I will be ... |
In git if I change a character in a line the entire line is considered changed.
I don't know much but stackexchange seem to track changes in a word-by-word basis in the edit history.
Is there an option to make git like that, or is there anything else that does this?
|
What does "branching is free" mean in Git?
I hear this a lot whenever Git is mentioned in comparison to other version control systems.
I haven't had the opportunity (?) to deal with others (SVN, etc.), so how is branching "expensive" in others?
|
I see the http parser written by Igor Sysoev for nginx does not use regular expressions
https://github.com/joyent/http-parser
What could be the main reason for such design decision? I guess I could write few regular expressions to parse HTTP req & res this would be a lot less complex than Igor's version of the parser. ... |
I have been asked to make a mobile app for a friends website. The website is a Multi level marketing site that sells products and franchises. A client logs in in to the website and can view his or her dashboard ( user can view team members, business volume, commissions, invoices, etc.) The app is supposed to bring the ... |
My OOP JavaScript question is at the very bottom if you want to skip my introduction.
In an answer to the question Accessing variables from other functions without using global variables, there's a comment about OOP that says:
If there's a chance that you will reuse this code, then I would
probably make the effor... |
Consider the following regex (no unicode):
Example:\x04\x05\x41
Suppose you search this regex case-insensitively. Would you expect it to search the final \x41 in case-sensitive manner? People whom I ask actually expect such behavior. And such expectations are wrong.
Perldoc says:
Note that a character expressed as on... |
As programmers I feel that our goal is to provide good abstractions on the given domain model and business logic. But where should this abstraction stop? How to make the trade-off between abstraction and all it's benefits (flexibility, ease of changing etc.) and ease of understanding the code and all it's benefits.
I b... |
(Let me edit this question to try to better get across what I am asking.)
I don't understand what a license is and how I may "use" it. From the little that I do understand, there are two situations:
One writes a program/source code and puts a license on it. The license says how other people may (are allowed) to use th... |
Non-Turing complete languages offer a great advantage over Turing-complete languages as they are much more analyzable and, thus, offer much broader optimization possibilities. Yet they are barely used and Turing-completeness is actually sold as a good feature.
Are there any mainstream non-Turing-complete languages avai... |
Except the garbage collector, what are some other features in Java that make it unsuitable for real time programming? On the net, whenever Java vs C++ is discussed with regards to real time programming, it is always the garbage collector that is mentioned. Is there anything else?
|
I am developing an iPhone app, which I am integrating with PayPal.
I did it successfully using PayPal library. I am testing it on sandbox mode. When I transfer money from one account to the other account, it displays a message "send to server for verification".
Is there a real need to store this PayPal transaction id a... |
I have an Email class that has a Send method that optionally takes an SmtpClient and sends an email asynchronously using SendAsync. If no SmtpClient is supplied to this method, it instantiates a default SmtpClient and uses that to send the email. Inside the Send function, I provide a SendCompleted callback which dispos... |
Researching archiving systems like archive.org, found out main issue of such is the dynamic content.
Initial analysis shows that content 'dynamicity' can be assigned to one of the following levels:
Static html content - plain old web page which is represented only by html markup with auxiliary css-referred resources (... |
I am in the process of filing in the gaps in my knowledge so that I can become a better developer. I am an ASP.NET developer and I sometimes need to do pure back-end stuff too. I ahve compiled a list of things I deem as necessary to know. Please feel free to fill in any gaps:
WebForms
MVC
jQuery
HTML5
WPF
WCF
The Repo... |
I have come across a book that claims that alterations
and augmentations to GPL works can be kept close-source
as long as these are not redistributed into the wild.
Therefore, customizations of websites deriving from
GPL packages need not be released under the GPL and
developers can earn profit on them by offering thei... |
I am creating a flowchart for a program with multiple sequential steps.
Every step should be performed if the previous step is succesful. I use a c-based programming language so the lay-out would be something like this:
METHOD 1:
if(step_one_succeeded())
{
if(step_two_succeeded())
{
if(step_three_succee... |
I am trying to achieve zero downtime deployments so I can deploy less during off hours and more during "slower" hours - or anytime, in theory.
My current setup, somewhat simplified:
Web Server A (.NET App)
Web Server B (.NET App)
Database Server (SQL Server)
My current deployment process:
"Stop" the sites on both We... |
Backstory
I inherited a bunch of code that I'd like to refactor. It is a UI application written in javascript.
Current state:
We have main application which consist of several UI components. And each component has entry fields, textboxes, menus, etc), like "ticket", "customer information", etc. Based on input, where t... |
Quick question concerning shared code/logic in back and front ends of a web application.
I have a web application (Rails + heavy JS) that parses metadata from HTML pages fetched via a user supplied URL (think Pinterest or Instapaper). Currently this processing takes place exclusively on the client-side. The code that f... |
I have come to a point, in building a services oriented architecture (on top of Thrift), that I need to expose events and allow listeners.
My initial thought was, "create an EventService" to handle publishing and subscribing to events. That EventService can use whatever implementation it desires to actually distribute ... |
At a recent job interview, I couldn't answer a question about SOLID -- beyond providing the basic meaning of the various principles. It really bugs me. I have done a couple of days worth of digging around and have yet to come up with a satisfactory summary.
The interview question was:
If you were to look at a .Net pr... |
I'm developing an iOS app where one of the features will be allowing users to share and collaborate on data (e.g. lists). From everything I've read and based on the way that iCloud CoreData sync works I assume that it would not be a good fit for the following reasons, but I wanted to make sure I wasn't missing anything... |
Note that my question is referring to those attributes that even on their own already represent a concept ( ie on their own provide a cohesive meaning ). Thus such attribute needs no additional functional support and as such is self-contained.
I'm also well-aware that even with self-contained attributes the custom typ... |
I saw below test question the other day in which the authors used a flowchart to represent the logic of loops, and I got to thinking it would be interesting to do this with some more complex logic. For example, the closure in this immediately-invoked function expression (IIFE) sort of boggles me:
while (i <= qty_of_get... |
I've spent about 20-40 hours developing part of a game using JavaScript and HTML5 canvas. When I started I had no idea what I was doing. So it started as a proof of concept and is coming along nicely now, but it has no automated tests. The game is starting to become complex enough that it could benefit from some aut... |
I am going to be developing a program that detects duplicate files and I was wondering what the best/fastest method would be to do this? I am more interested in what the best hash algorithm would be to do this? For example, I was thinking of having it get the hash of each files contents and then group the hashes that a... |
I am not sure if anyone has done it. I am trying to do something that is in general, uncommon i.e. unit-testing executable (Windows) or ELFs (Linux). I know that CppUnit provides a good unit testing facility, but I have never used it for unit-testing (used UnitTest++). I hear rumours that you can unit-test executables ... |
This has been a cause of frustration for me on many sites like IRCTC, Online Banking sites which wont allow Back, forward or refresh. If you do you would be logged out and you have to login again. What I don't understand is what concern had there been in their mind to have such terrible "feature".
|
According to Jeff Bay's Essay on Object Callisthenics,
One of the practices is set to be "Wrap all primitives and Strings"
Can anyone elaborate on this ?
In languages where we already have wrappers for primitives like C# and Java.
and In languages where Collections can have generics where you are sure of what type goes... |
We were looking for some topics related to audio analysis and found acoustic fingerprinting. As it is, it seems like the most famous application for it is for identification of music.
Enter our manager, who requested us to research and possible find an algorithm or existing code that we can use for this very simple app... |
We have a large bazaar repository and we want to convert it to a git repository. The bazaar repository contains the folders of each of the interns. Any documentation/code prepared by interns is committed in their directory so there are a huge number of commits.
What steps should be performed to securely convert the baz... |
Assume I have a simple interface for translating text (sample code in C#):
public interface ITranslationService
{
string GetTranslation(string key, CultureInfo targetLanguage);
// some other methods...
}
A first simple implementation of this interface already exists and simply goes to the database for every me... |
I serialized lambda expressions in C# before. Now I wanna use F# instead of C# for serialization and deserialization.
I heard F# is better in this area. Is it true?
How can I do that with F#?
I’d appreciate even if you just suggested a correlated link.
|
I have some experience in programming in Java but wondering if someone could explain what is the difference between Enterprise Java vs Core Java?
Someone asked me a question on whether I use core-Java or Enterprise Java. Now I have to ask is there such thing as core-java?
|
I'm supposed to implement a relatively complex form that looks like follows, but has at least four more pages requiring the user to fill in all necessary information for the tracks:
This data will need to be sent to the server, which is implemented using Dropwizard. I'm looking for best practices on how to upload and ... |
On the past 2 projects I've worked, teams prefer a local development environment over a development server.
The one project lead stated that local was better since it didn't require an internet connection. But, this seems assumed when developing.
Which is usually better?
|
Assume I have a Query - as in CQS that is supposed to return a single value.
Let's assume that the case that no value is found is not exceptional, so no exception will be thrown in this case. Instead, null is returned.
However, if no value has been found, I need to act according to the reason why no value has been foun... |
I’ve got a 2 database tables in parent/child relationship as one-many.
I’ve got three classes representing the data in these two tables:
Parent Class
{
Public int ID {get; set;}
.. other properties
}
Child Class
{
Public int ID {get;set;}
Public int ParentID {get; set;}
.. other properties
}
Toget... |
What values in an application should be configurable, or otherwise not hard coded? Does this differ based on application type (batch vs UI) and are there any published standards or guidance on this topic (IEEE, ACM, vendor, etc)?
|
Lately I have been writing a game engine, and I have been writing a lot of "foundation stuff" (standard interfaces, modules, a message system ect.), but I have noticed a pattern, a lot of the stuff is interdependent and I can not debug until everything is done, hence I do not debug for about 3 to 5 hours at a time. I a... |
For all you OOD experts. What would be the recommended way to model the following scenario?
I have a certain class hierarchy similar to the following one:
class Base {
...
}
class Derived1 : Base {
...
}
class Derived2 : Base {
...
}
...
Next, I would like to implement different compression/decompression en... |
I have an application that allows users to edit certain parts of text and then email that out. My question is what is the best way to store this in a Microsoft SQL Server database. Right now I have two tables, one holding the HTML data and one holding the plain text data. When the user saves the info, it replaces newli... |
How come in C++ when you put:
while (expression);
the while loop doesn't run no matter if the expression is true or not.
However if you put:
if (expression);
the statement runs no matter if the expression is true or not.
It seems like they should both behave the same way.
|
I previously asked this at stack overflow but it was closed, I believe because 'programmers' is a more appropriate venue for this question.
I have done some work on the SVN Importer project (Apache license), which appears to be effectively dead (no published changes in 5 years). I have a login to their svn server but d... |
I've inherited a legacy software system, and have been tasked with performing usability and system upgrades. While there's nothing bad with the system, from discussions with the users, there are "small" usabilty issues that need to be addressed.
At this stage I'm the lone developer on this system, and apart from testin... |
I'm trying to work through how to write this code.
def get(params):
""" Fetch a user's details, or 404 """
user = User.fetch_by_id(params['id'])
if not user:
abort(404)
# Render some template for the user...
What's the best way to handle the case where the lookup fails? One principle says you s... |
I understand the concepts of deadlock well enough, but when I'm given a problem like the one below I'm not sure how to go about solving it. I can draw a resource allocation graph, but I'm not sure how to solve it from there.
Is there a better more formal way of solving this?
Consider a system with five processes, ... |
I decided to get my hands wet and got the YII framework for PHP.
I created my first application, then created new controller, model and view. Connected to database, got my record passed from controller to the view and printed the hello world.
I am confused now. If I have to do the same thing for each page, this seems l... |
I'm trying to implement this JavaFX code where I want to call remote Java class and pass boolean flag:
final CheckMenuItem toolbarSubMenuNavigation = new CheckMenuItem("Navigation");
toolbarSubMenuNavigation.setOnAction(new EventHandler<ActionEvent>()
{
@Override
public void handle(ActionEvent e... |
Even after reading a bunch I'm still falling into the same trap. I have a class, usually an enity. I need to implement more than one, similar operations on this type. It feels wrong to (seemingly arbitrarily) choose one of these operations to belong inside the entity and push the others out to a separate class; I end u... |
I am not really sure how to correctly describe my question, so please forgive me if this is a duplicate. I am creating a flowchart for my program where I implement a method. Let's assume I call this method someMethod.
The C code could look something like this:
bool someMethod(int Foo, int Bar)
{
foo += 5;
bar -... |
It seems apparent that English is the dominant international language for programming based on previous P.SE questions (though a highly upvoted comment correctly points out that asking a question like that on a predominantly English site will skew the results).
However, is there benefit in learning a foreign language f... |
The question, Stored procedure Naming conventions?, and Joel's excellent Making Wrong Code Look Wrong article come closest to addressing my question, but I'm looking for a more general set of criteria to use in deciding how to name modules containing code (classes, objects, methods, functions, widgets, or whatever).
En... |
Starting point:
I currently do development for Dynamics Ax, Android and an occasional dabble with Wordpress and Python.
Soon, I'll start a project involving setting up WP on Google Apps Engine.
Everything is, and should continue to, run from the same PC (running Linux Mint).
Issue:
I'm afraid of botching/bogging ... |
If you have a method that doesn't need access to any non public fields, properties or methods where should you put the method ?
should it just be a normal method in the class, a static method that takes an instance as a parameter, an extension method or something else ?
|
I'm asked to refactor my component code to support A/B Testing.
What is the better approach:
1) Pass a boolean value to the methods and check for that flag inside the method body?
method(flag abTest):
if A_VERSION_ENABLED:
// Do 'A' logic
else
// Do 'B' logic
2) Create dedicated methods for... |
I want multiple users to edit same document. Problem I'm facing is when a new user joins, he might see an outdated document. How do I make sure that new users get most recent changes?
Some solutions I thought of:
Save on every change. I don't like this solution because it will slow things down on UI and put load on ... |
I am putting this question to C++ programmers because:
a) Only a C++ programmer can judge the technical merits of the examples;
b) Only a programmer will have a feel for the temperament of another programmer who writes code like this.
HR and the directors are aware there is a problem simply because they see evidence in... |
Sockets were invented in Berkeley around 1983, but how did networked computer programs work before this? These days, pretty much everything uses sockets, so it's hard for me to imagine how else programs could communicate and Google turned up nothing.
|
I created a library that is a invoker for a web service somewhere else. The library exposes asynchronous methods, since web service calls are a good candidate for that matter.
At the beginning everything was just fine, I had methods with easy to understand operations in a CRUD fashion, since the library is a kind of re... |
Assume a simple class that implements the Tester/Doer pattern:
public class FooCommandHandler : ICommandHandler
{
public bool CanHandle(object command)
{
return command is FooCommand;
}
public void Handle(object command)
{
var fooCommand = (FooCommand)command;
// Do somethin... |
Something I've been wondering about recently is how to organize types in directories/namespaces w.r.t. their dependencies.
One method I've seen, which I believe is the recommendation for both Haskell and .NET (though I can't find the references for this at the moment), is:
Type
Type/ATypeThatUsesType
Type/AnotherTypeTh... |
Using signed manifests in ClickOnce deployments, it is not possible to modify files after the deployment package has been published - installation will fail as hash information in the manifest won't match up with the modified files. I recently stumbled upon a situation where this was problematic - customers need to be ... |
In building an application that deals with a lot of mathematical calculations, I have encountered the problem that certain numbers cause rounding errors.
While I understand that floating point is not exact, the problem is how do I deal with exact numbers to make sure that when calculations are preformed on them float... |
I'm writing an application for a medium sized company that will be used by about 90% of our employees and our clients.
In planning for the future we decided to add functionality that will verify that the version of the program that is running is a version that we still support. Currently the application will forcequit ... |
I have around 10000+ strings and have to identify and group all the strings which looks similar(I base the similarity on the number of common words between any two give strings). The more number of common words, more similar the strings would be. For instance:
How to make another layer from an existing layer
Unable to... |
the purpose of oop using classes is to encapsulate members from the outer space. i always read that accessing members should be done by methods. for example:
template<typename T>
class foo_1 {
T state_;
public:
// following below
};
the most common doing that by my professor was to have a get and set method.
//... |
I've developed an ADHD management system for myself that's attempting to change multiple habits at once. I know this is counter to conventional wisdom, but I've tried the conventional for years & am now trying it my way. (just wanted to say that to try and prevent it from distracting people from the actual question)
An... |
Trying to make most of the GAE Datastore entities concept, but some doubts drill my head.
Say I have the model:
class User(ndb.Model):
email = ndb.StringProperty(indexed=True)
password = ndb.StringProperty(indexed=False)
first_name = ndb.StringProperty(indexed=False)
last_name = ndb.StringProperty(index... |
Suppose you've got a project that is running late. Is there any proof or argument that teams become much more productive by adding more people? I am looking for answers that can be supported by facts and references if possible.
What I'm thinking about is that existing devs have to teach the new ones (thus losing overa... |
What I mean about that is that in nearly every tutorial I've read about functional languages, is that one of the great things about functions, is that if you call a function with the same parameters twice, you'll always end up with the same result.
How on earth do you then make a function that takes a seed as a paramet... |
I just have read some stuff on enum today. Use of flags with enum was something interesting and new for me. But often practice and theoretical uses are different. I go through many articles they examples they quoted were good to get the concept but am still wondering in what situations one can use Enums with flag to st... |
Sometimes, although not often, I have to include math logic in my code. The concepts used are mostly very simple, but the resulting code is not - a lot of variables with unclear purpose, and some operations with not so obvious intent. I don't mean that the code is unreadable or unmaintainable, just that it's waaaay har... |
Which code is better:
// C++
void handle_message(...some input parameters..., bool& wasHandled)
void set_some_value(int newValue, int* oldValue = nullptr)
// C#
void handle_message(...some input parameters..., out bool wasHandled)
void set_some_value(int newValue, out int oldValue)
or
bool handle_message(...some inp... |
I have been working on some software application and I update them every 6 months. Currently, the way I track the date is by extracting the date from the system when the user installs the application, encrypt it and store it in a file locally. Whenever the application is started, it checks if 6 months have passed, then... |
I find that whenever I want to go run a past project, it will take a long time before I can find it and before I have everything set-up again for it to be able to run.
For example, I have python projects I created in Linux, and it depends on software packages that are easily installed in Linux, yet I no longer have t... |
I am trying to learn GRASP and I found this explained (here on page 3) about Low Coupling and I was very surprised when I found this:
Consider the method addTrack for an Album class, two possible methods are:
addTrack( Track t )
and
addTrack( int no, String title, double duration )
Which method reduces coupling?
The... |
I find that I sometimes use placeholders in strings, like this:
$ cat example-apache
<VirtualHost *:80>
ServerName ##DOMAIN_NAME##
ServerAlias www.##DOMAIN_NAME##
DocumentRoot /var/www/##DOMAIN_NAME##/public_html
</VirtualHost>
Now I am sure that it is a minor issue if the placeholder is ##DOMAIN_NAME##, !... |
I'm working on a project that has its own database call it InternalDb, but also it queries two other databases, call them ExternalDb1 and ExternalDb2. Both ExternalDb1 and ExternalDb2 are actually required by a few other projects. I'm wondering what the best approach for dealing with this is?
Currently, I've just cre... |
I am working on a system that has many remote laptops all connected to the internet through cellular data connections.
The application will synchronize periodically to a central database. The problem is, due to factors outside our control, the cost to move data across the cellular networks are spectacularly expensive... |
I've been learning F# and it's starting to influence how I think when I'm programming C#. To that end, I have been using recursion when I feel the result improves readability and I can't envision it winding out to a stack overflow.
This leads me to ask whether or not compilers could automatically convert recursive fu... |
Is it necessary/recommend/best practice/any other positive to use only one server environment to perform all development, unit testing and QA?
If so, is it then wise/part of Agile to then have only one staging environment before Live?
Considering that this could mean internationally distributed teams of developers and ... |
Microsoft employees commonly describe Windows 8 as having both a Render thread and UI thread.
Typically they say the Render thread performs animations and the UI thread handles most other operations: parsing, layout, applying templates, data binding, input processing, most app callbacks, etc.
Animations can be calcula... |
You know how in Minecraft, the World is ever-expanding and all the biomes are randomized?
My generalized question is: In relation to a space simulation that is also ever-expanding as the player moves about the world, how would one go about programming this randomization in Java?
My real question is: Could I get a simpl... |
Here's the problem :
While implementing a C# wrapper for an online API (Discogs) I've been faced to a dilemma : quite often the responses returned have mostly similar members and while modeling these responses to classes, some questions surfaces on which way to go would be the best.
Example :
Querying for a 'release' o... |
So I am reading up on python in Mark Lutz's wonderful LEARNING PYTHON book. Mark makes a big deal about how part of the python development philosophy is polymorphism and that functions and code should rely on polymorphism and not do much type checking. However, I do a lot of math type programming and so the idea of pol... |
I have a Folder entity that can be Moderated by users. Folders can contain other folders. So I may have a structure like this:
Folder 1
Folder 2
Folder 3
Folder 4
I have to decide how to implement Moderation for this entity. I've come up with two options:
Option 1
When the user is given moderatio... |
I've found a project on Github that I'm interested in contributing to which claims to be open source and has a GPL license included with it.
But the original author has added a copyright notification to each source file. I'm not sure why but I don't feel right contributing to a project that's always going to have some... |
Long running switch cases or if-else-if constructs are avoided in OOP using polymorphism wherever it is applicable.
instead of branching by matching a value, branching is done at class-level itself.
How can similar approach be applied in Functional Programming paradigm, Clojure specifically ?
|
Without being presumptuous, I would like you to consider the possibility of this.
Most OS today are based on pretty low level languages (mainly C/C++)
Even the new ones such as Android uses JNI & underlying implementation is in C
In fact, (this is a personal observation) many programs written in C run a lot faster than... |
I've been using Python since version 2.2. I do pick up new language constructs like for example with statement or dictionary/set comprehensions. However, I've realized that even though I'm being consistent with PEP-8, for existing constructs I'm using old style, rather than new style (for example except Exception, e in... |
I have recently used some software, which come as a regular setup file, where you install your software, and then when you run it, opens the browser, uses the localhost with some specific port number to connect to the software, and runs it from there. I find it quite useful and interesting. But I even don't know whethe... |
As a relational database programmer (most of the time), I read articles about how relational databases don't scale, and NoSQL solutions such as MongoDB do.
As most of the databases I have developed so far have been small to mid scale, I have never had a problem that hasn't been solved by some indexing, query optimizat... |
When a bug is fixed, the dev set its status to "resolved" and the bug is reassigned back to the person that created it. In our case this is usually the product owner - we don't have dedicated testers.
But what's a good process for controlling how/when the PO tests the software? Should he be given the latest build after... |
Say I have a simple structure:
app = webapp2.WSGIApplication([
(r'/', 'pages.login'),
(r'/profile', 'pages.profile'),
(r'/dashboard', 'pages.dash'),
], debug=True)
Basically all pages require authentication except for the login. If visitor tries to reach a restrictive page and he isn't authorized (or lacks... |
This test would call a web service over and over for about a minute to confirm that a particular response code is returned, notifying us of our rate limit being reached. Not only is it a very slow test, it doesn't confirm much of anything, and wastes resources.
I feel that this is like confirming that chugging a bottle... |
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