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  • How to perform a Depth First Search iteratively using async/parallel processing?

    - by Prabhu
    Here is a method that does a DFS search and returns a list of all items given a top level item id. How could I modify this to take advantage of parallel processing? Currently, the call to get the sub items is made one by one for each item in the stack. It would be nice if I could get the sub items for multiple items in the stack at the same time, and populate my return list faster. How could I do this (either using async/await or TPL, or anything else) in a thread safe manner? private async Task<IList<Item>> GetItemsAsync(string topItemId) { var items = new List<Item>(); var topItem = await GetItemAsync(topItemId); Stack<Item> stack = new Stack<Item>(); stack.Push(topItem); while (stack.Count > 0) { var item = stack.Pop(); items.Add(item); var subItems = await GetSubItemsAsync(item.SubId); foreach (var subItem in subItems) { stack.Push(subItem); } } return items; } EDIT: I was thinking of something along these lines, but it's not coming together: var tasks = stack.Select(async item => { items.Add(item); var subItems = await GetSubItemsAsync(item.SubId); foreach (var subItem in subItems) { stack.Push(subItem); } }).ToList(); if (tasks.Any()) await Task.WhenAll(tasks); UPDATE: If I wanted to chunk the tasks, would something like this work? foreach (var batch in items.BatchesOf(100)) { var tasks = batch.Select(async item => { await DoSomething(item); }).ToList(); if (tasks.Any()) { await Task.WhenAll(tasks); } } The language I'm using is C#.

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  • Attribute & Reflection libraries for C++?

    - by Fabian
    Most mature C++ projects seem to have an own reflection and attribute system, i.e for defining attributes which can be accessed by string and are automatically serializable. At least many C++ projects I participated in seemed to reinvent the wheel. Do you know any good open source libraries for C++ which support reflection and attribute containers, specifically: Defining RTTI and attributes via macros Accessing RTTI and attributes via code Automatic serialisation of attributes Listening to attribute modifications (e.g. OnValueChanged)

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  • Retrieve web user's Identity outside of request scope

    - by Kendrick
    I have an ASP.NET app that logs Audit reports using nHibernate's IPreUpdateListener. In order to set the current user in the Listener events, I was using System.Security.Principal.WindowsIdentity.GetCurrent(). This works fine when debugging on my machine, but when I move it to the staging server, I'm getting the ASP.NET process credentials, not the requesting user. In the ASP.NET page, I can use Request.LogonUserIdentity (which works fine since I'm using integrated authentication), but how do I reference this user directly without having to pass it directly to my event? I don't want to have to pass this info through the pipeline because it really doesn't belong in the intermediate events/calls.

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  • How can I stay focused and motivated on a project?

    - by RTS
    I'm working on starting my own software development business, but I've noticed that I have major issues getting projects out by their deadlines, and in general getting them out of the "almost-done" stage. I feel my problem is that I like complex programming too much, and I end up rewriting code to make it cleaner/more efficient/less error prone as a means of putting off more "boring" development. I end up with polished applications at the end, but I spend twice as long on the project as I should have. If I ever want my company to succeed, I need to work on staying focused on what actually needs to be done, so the question is: What techniques do you use to keep yourself focused and motivated on a project, in your career?

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  • Microsoft Enterprise Logging Application Block - Reading Log File

    - by Or A
    Hi, I'm using MS log application block for logging my application event into a file called app-trace.log which located on the c:\temp folder. I'm trying to find the best way to read this file at runtime and display it when the user asks for it. now i have 2 issues: it seems that this kind of feature is not supported by the framework, hence i have to write this reader myself. am i missing something here? is there any better way of getting this data (w/o buffering it in the memory or saving it into another file). if i'm taking the only alternative that left for me, and implementing the reader myself, when i'm tring to do: System.IO.FileStream fs = new System.IO.FileStream(@"c:\temp\app-trace.log", FileMode.Open, FileAccess.Read); i'm getting "File being used by another process c#", probably the file is locked by the application block. is there any way to access and read it anyhow? Thank

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  • Unresolved External Symbol

    - by TomO
    I am working on wrapping a large number of .h and .lib files from native C++ to Managed C++ for eventual use as a referenced .dll in C#. I have the .lib files linked in and everything has been going smoothly so far. Upon wrapping the latest .h file, I hit a snag when 2 functions came back with the link error: error LNK2019: unresolved external symbol __imp__htonl@4 referenced in function "public: void __thiscall Field::setCharacter(unsigned char,int)" (?setCharacter@Field@@QAEXEH@Z) myutils.lib I have referenced "myutils.lib" in the linker options, so that shouldn't be the issue. What's strange is that I have about 20 functions in this particular .h file and all of the rest are linking just fine except for 3 functions. Any ideas?

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  • What's the best way to distribute Lua and libraries?

    - by SJML
    I'm looking at moving a program that currently embeds a Python interpreter to use Lua. With Python it's fairly easy to use modulefinder, compileall, and zipfile to make a nice tidy zip containing all the external libraries used. Does Lua have the ability to bundle up its libraries like that, or is there some better best practice for distributing programs that embed Lua?

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  • C++: Platform indepentend game lib?

    - by Martijn Courteaux
    Hi, I want to write a serious 2D game, and it would be nice if I have a version for Linux and one for Windows (and eventually OSX). Java is fantastic because of its platform independent. But Java is to slow to write a serious game. So, I thought to write it in C++. But C++ isn't very cross-platform friendly. I can find game libraries for Windows and libraries for Linux, but I'm searching one that I can use for both, by recompiling the source on a Windows platform and on a Linux platform. Are there engines for this or is this idea irrelevant? Isn't it that easy (recompiling)? Any advice and information about C++ libraries would be very very very appreciated!

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  • How can I apply Readme Driven Development to an ongoing project?

    - by Metalcoder
    I'm assigned to a project where the goal is to update an existing software. This software was developed in a totally ad hoc manner, which means that any documentation generated is outdated, confused and just plain useless. I do not want to retroactivelly produce all the missing artifacts, since this would just be a waste of time. The code base is ugly, and really need some serious refactoring, but this is another story. What I want is to apply Readme Driven Development to guide this project. So, basically, I want to write a Readme, which will document every change meaningful at the user level. The problem is, I have no idea about how to structure this document. For me, it's pretty clear that it should have a different layout than the traditional Readme. I really want to document changes, and not the current state of affairs. Any ideas?

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  • What are general guidelines and advices to estimate how much you should charge for a project, being a novice freelancer?

    - by Dokkat
    I am an experienced programmer but completely new to the market. Someone wants me to do a project for them, but I do not know how much it is worth. What are general guidelines/advices for finding what a project is worth on the market? If I can ask here about this particular one, it is a HTML5 site with a login/register form and a video player that has to play a lecture video and powerpoint slides synchronized. They'll give me the video, the audio the powerpoints. I should also do some editting on the video before.

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  • What is the right way to group this project into classes?

    - by sigil
    I originally asked this on SO, where it was closed and recommended that I ask it here instead. I'm trying to figure out how to group all the functions necessary for my project into classes. The goal of the project is to execute the following process: Get the user's FTP credentials (username & password). Check to make sure the credentials establish a valid connection to the FTP server. Query several Sharepoint lists and join the results of those queries to create a list of items that need to have action taken on them. Each item in the list has a folder. For each item: Zip the contents of the folder. Upload the folder to the FTP server using SFTP Update the item's Sharepoint data. Email the user an Excel report showing, e.g., Items without folder paths Items that failed to zip or upload Steps 2-5 are performed on a periodic basis; if step 2 returns an invalid connection, the user is alerted and the process returns to step 1. If at any point the user presses a certain key, the process terminates. I've defined the following set of classes, each of which is in its own .cs file: SFTP: file transfer processes DataHandler: Sharepoint data retrieval/querying/updating processes. Also makes and uploads the zip files. Exceptions: Not just one class, this is the .cs file where I have all of my exception classes. Report: Builds and sends the report. Program: The main class for running the program. I recognize that the DataHandler class is a god object, but I don't have a good idea of how to refactor it. I feel like it should be more fine-grained than just breaking it into Sharepoint, Zip, and Upload, but maybe that's it. Also, I haven't yet worked out how to combine the periodic behavior with the "wait for user input at any point in the process" part; I think that involves threads, which means other classes to manage the threads... I'm not that well-versed in design patterns, but is there one that fits this project well? If this is too big of a topic to neatly explain in an SO answer, I'll also accept a link to a good tutorial on what I'm trying to do here.

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  • creating lib file inc

    - by user222820
    hi there i have written a very simple program that has a SUM function i wanna create a .lib file how can i do it please help me my program is c in windows xp int sum(int a , int b) { return a + b; }

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  • Plugin architecture in C using libdl

    - by LukeN
    I've been toying around, writing a small IRC framework in C that I'm now going to expand with some core functionality - but beyond that, I'd like it to be extensible with plugins! Up until now, whenever I wrote something IRC related (and I wrote a lot, in about 6 different languages now... I'm on fire!) and actually went ahead to implement a plugin architecture, it was inside an interpreted language that had facilities for doing (read: abusing) so, like jamming a whole script file trough eval in Ruby (bad!). Now I want to abuse something in C! Basically there's three things I could do define a simple script language inside of my program use an existing one, embedding an interpreter use libdl to load *.so modules on runtime I'm fond of the third one and raather avoid the other two options if possible. Maybe I'm a masochist of some sort, but I think it could be both fun and useful for learning purposes. Logically thinking, the obvious "pain-chain" would be (lowest to highest) 2 - 1 - 3, for the simple reason that libdl is dealing with raw code that can (and will) explode in my face more often than not. So this question goes out to you, fellow users of stackoverflow, do you think libdl is up to this task, or even a realistic thought?

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  • What methodology to use for planning/developing a Language conversion project?

    - by user 123
    I am trying to help my friend by creating a part of his on-going project. What I'm going to do is create a Java parser to break up the Java code into operators, parameters etc to build XML representation. Next I want to create a code generator to convert the parsed java code to XML conforming to the schema I've created. Finally I want to use an XML style-sheet to transform the XML into another programming language type. Basically I just wanted some advice on which methodology/model I should use for planning and developing this project. Is there some benefit to using Agile etc for instance?

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  • Build model with nested model in rspec integration test

    - by user1116573
    I understand that I can do something like in rspec: let(:project) { Project.new } but in my app a project accepts_nested_attributes_for tasks and when I generate the Project form I build a task along with it using: @project = Project.new @project.tasks.build I need something like: let(:project) { Project.new.tasks.build } but that doesn't seem to work. How can I do this as a let in my rspec test?

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  • Missing A Detail About Boost (.lib files)

    - by bobber205
    Where do I find the lib files for linking my program when using some Boost libraries? Decided to try its threading functionality but I am getting Error 6 fatal error LNK1104: cannot open file 'libboost_thread-vc90-mt-gd-1_42.lib' InterviewPractice after I include Error 6 fatal error LNK1104: cannot open file 'libboost_thread-vc90-mt-gd-1_42.lib' InterviewPractice I can't find where to get the .lib files for proper linking on the boost website? Any tips? :)

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  • What is the best way to distribute C++ class

    - by Tarun
    Hi, I have created a big C++ class. I need to give it to another person. I dont want him to see the function implementations but he should be able to use it as a class. (for example: he can inherit this class, use its full functionality in his code but can not see or change function implementations etc) How can i do this. thanking you..

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  • How to start working in a team on a project? [closed]

    - by Adio
    Ok, for the first time in my life I am going to work in a team. The problem is that all the team members including me are junior developers and for all of us this is the first time we are working in a team. The problem is that we do not know how to start the project. We know a little about scrum and agile development, we have our user stories in place and our created project - which does not have even one piece of code - and now we are stuck and don't know how and what to do? All scrum books talk about scrum development but lack of the details like how to start. How my team will know what object I am using? How we will push the first piece of code and what it will be? Any help will be great. Books, articles, advice, or anything.

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  • jQuery::Ajax success never occurs

    - by Legend
    I have an ajax call in the head section of my index.html $.ajax({ method: 'get', url : 'php/getRecord.php?color=red', dataType: "json", success: function (data) { alert(data); } }); For some reason, that alert never gets called. Am I doing something wrong? The PHP file does give me data when testing it directly.

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  • [C++] Missing A Detail About Boost (.lib files)

    - by bobber205
    Where do I find the lib files for linking my program when using some Boost libraries? Decided to try its threading functionality but I am getting Error 6 fatal error LNK1104: cannot open file 'libboost_thread-vc90-mt-gd-1_42.lib' InterviewPractice after I include Error 6 fatal error LNK1104: cannot open file 'libboost_thread-vc90-mt-gd-1_42.lib' InterviewPractice I can't find where to get the .lib files for proper linking on the boost website? Any tips? :)

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  • Why is `goog.Disposable.call(this);` necessary?

    - by David Faux
    In this snippet of Google Closure javascript code involving a constructor, why is goog.Disposable.call(this); necessary? Doesn't Foo already inherit from Disposable with goog.inherits(foo, goog.Disposable);? goog.provide('foo'); /** * @constructor */ foo = function(){ goog.Disposable.call(this); } goog.inherits(foo, goog.Disposable); foo.prototype.doSomething = function(){ ... } foo.prototype.disposeInternal = function(){ ... }

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