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  • What would one call this architecture?

    - by Chris
    I have developed a distributed test automation system which consists of two different entities. One entity is responsible for triggering tests runs and monitoring/displaying their progress. The other is responsible for carrying out tests on that host. Both of these entities retrieve data from a central DB. Now, my first thought is that this is clearly a server-client architecture. After all, you have exactly one organizing entity and many entities that communicate with said entity. However, while the supposed clients to communicate to the server via RPC, they are not actually requesting services or information, rather they are simply reporting back test progress, in fact, once the test run has been triggered they can complete their tasks without connection to the server. The request for a service is actually made by the supposed server which triggers the clients to carry out tests. So would this still be considered a server-client architecture or is this something different?

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  • SQL SERVER Fix : Error : 8501 MSDTC on server is unavailable. Changed database context to publisher

    During configuring replication on one of the server, I received following error. This is very common error and the solution of the same is even simpler.MSDTC on server is unavailable. Changed database context to publisherdatabase. (Microsoft SQL Server, Error: 8501)Solution:Enable Distributed Transaction Coordinator in SQL Server.Method 1:Click on StartControl Panel-Administrative Tools-ServicesSelect the service [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS

    - by Jason Faulkner
    Even if you’ve only loosely followed the events of the hacker groups Anonymous and LulzSec, you’ve probably heard about web sites and services being hacked, like the infamous Sony hacks. Have you ever wondered how they do it? There are a number of tools and techniques that these groups use, and while we’re not trying to give you a manual to do this yourself, it’s useful to understand what’s going on. Two of the attacks you consistently hear about them using are “(Distributed) Denial of Service” (DDoS) and “SQL Injections” (SQLI). Here’s how they work. Image by xkcd HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed How to Run Android Apps on Your Desktop the Easy Way

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  • JSR Updates and Inactive JSR ballots

    - by heathervc
    The following are JSRs have posted updates in the last week: JSR 331, Constraint Programming API, has posted a Maintenance Draft Review; this review closes 29 September. JSR 352, Batch Applications for the Java Platform, has posted an Early Draft Review; this review closes 29 September. JSR 353, Java API for JSON Processing, has posted an Early Draft Review; this review closes 7 October. Inactive JSRs: The following JSR proposals have been Inactive for at least two years and are currently on the EC ballot to be declared Dormant, following a period where the community was given an opportunity to express interest in their continued development: JSR 50, Distributed Real-Time Specification JSR 282, Real-Time Specification for Java (RTSJ) 1.1 JSR 307, Network Mobility and Mobile Data API JSR 327, Dynamic Contents Delivery Service API for Java ME JSR 328, Change Management API

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  • What is the most reliable session storage in PHP: Memcache, database or files?

    - by user1179459
    What is the best and most safest way to handle PHP sessions. Is the best way to store sessions in: Database (more reliable, but high bottleneck, slow speed, not good for high database usage websites)? Memcache (super fast, but distributed more security problems, chances of loosing data when the server restarted and chances of loosing data when the cache is full)? Files (default option, I guess slow since it reads and writes from file I/O, less security, etc). Which method is the best? What are the problems and good things of each of those approaches?

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  • As a programmer what single discovery has given you the greatest boost in productivity?

    - by ChrisInCambo
    This question has been inspired by my recent discovery/adoption of distributed version control. I started using it (mercurial) just because I liked the idea of still being able to make commits at times when I couldn't connect to the central server. I never expected it would give me a large boost in general productivity, but a pleasant side effect I discovered was that making a new clone every time I started a new task and giving that clone a descriptive folder name is extremely effective at keeping me on task resulting is a noticeable productivity increase. So as a programmer what single discovery has given you the greatest boost in productivity? Extra respect for answers which involve tools or practices that aren't so obvious from the outside!

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  • ASP.NET MVC Portable Areas - Can they communicate and be used as a plugin-like architecture?

    - by Beton
    I'll get straight to the point: I was wondering if there is a common pattern to use portable areas as a components of a plugin-like architecture. Example: We've got 3 plugins (portable areas) packaged and distributed via NuGet feed. Each of them is following the standard MVC structure (has it own Models, Views and Controllers). Lets say login form, header and footer. What I was wondering if there is a way to make them communicate. For example: when user logs on, login plugin executes it own logic, logs the user and then it updates the state of the header plugin with changes it state accordingly. Thanks in advance.

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  • How can I obtain in-game data from Warcraft 3 from an external process?

    - by Slav
    I am implementing a behavior algorithm and would like to test it with my lovely Warcraft III game to watch how it will fight against real players. The problem I'm having is that I don't know how to obtain information about in-game state (units, structures, environment, etc.) from the running WC3 game. My algorithm needs access to the hard drive and possibly distributed computing, that's why JASS (WC3's editor language) isn't appropriate; I need to run my algorithm from a separate process. Direct3D hooking is an approach, but it wasn't done for WC3 yet and a significant drawback of that approach would be the inability to watch how the AI performs online, since it uses the viewport to issue commands. How I read in-game data from WC3 in a different process in a fastest and easiest way?

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  • Can I install Ubuntu 12.04 on MacBook 6.1 (Late 2009) on my external hard drive?

    - by tommywinarta
    I have no experience in installing Linux based OS on MacBook, but I already have Windows installed on my Mac. I read some articles saying I can have the Lucid Lynx installed in my Macbook 6.1 and luckily I already got the CD (which was distributed for free back then haha), my question is that can I have the 12.04 installed instead of the 10.04 and what do I need to do that? I also would like to know can I install it on my external hard drive just like installing it on a usb stick? I have viewed the how-to for installing the Lucid Lynx, is it just the same? Thanks in advance!

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  • Azure Florida Association: Modern Architecture for Elastic Azure Applications

    - by Herve Roggero
    Join us on November 28th at 7PM, US Eastern Time, to hear Zachary Gramana talk about elastic scale on Windows Azure. REGISTER HERE: https://www3.gotomeeting.com/register/657038102 Description: Building horizontally scalable applications can be challenging. If you face the need to rapidly scale or adjust to high load variations, then you are left with little choice. Azure provides a fantastic platform for building elastic applications. Combined with recent advances in browser capabilities, some older architectural patterns have become relevant again. We will dust off one of them, the client-server architecture, and show how we can use its modern incarnation to bypass a class of problems normally encountered with distributed ASP.NET applications.

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  • Creating sites with local ips that pointing to a distant server.

    - by fatnjazzy
    Hi. We are a company that is distributed in several places over Europe (real offices). Each office has its own domain. company.de company.co.uk company.ch And so. Our website servers are located in one place. We can't distribute our site to different locations. How can we create a local IP in each location to show our main server. so google will see us as local ip. Explanation: Google has decided to increase your PR if you have a local IP, they think that if you bought a server in a local market means that you are very serious about your business. We have 8 employees in each office, we cant have a separate server, is that mean that we are not serious about our business? no, this is y i need to create this illusion. Thanks

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  • Handling (many) multiple projects in Git in an enterprise environment

    - by Michael K
    One of the advantages of older version control systems such as CVS and SVN in enterprise development is that anyone can connect to source control and see all the projects that the company has. This can make it easier to get a high level view of what kid of development is happening outside your sprint and also keeps everything in one place and easy to find. However, distributed version control systems (Git, specifically) use the repository as their base unit. They work best with one project (or several closely related projects) per repository. This makes repository management more difficult in most enterprise environments where it is not unusual to have more than 25-50 projects to support. As far as I have been able to determine, you have to keep a list somewhere else of all the repos you have. There is software available, like GitHub, that help, but that still is an extra step beyond a single connection string and listing the contents of the repository. What is the best way to deal with the complexity of multiple repositories?

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  • Counting product releases if you work on the backend/online services?

    - by stackoverflowuser2010
    I am trying to update my resume, and I would like to count the number of "product releases" that I was directly involved in with a company. It would seem to serve as a performance metric. The problem is that I was working on the backend of a very large distributed system, like along the lines of Hadoop or other huge database. We had regular 6-month major releases and other minor releases. My manager kept saying that "shipped" these releases, but "shipping" a product to me sounds like releasing single pieces of software, like Microsoft would ship Office 11 or something. Any ideas on "product releases" for backend service engineers, or any other type of performance metric?

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  • MySQL: Best of Breed Database

    - by Bertrand Matthelié
    Oracle offers best of breed technology at every layer of the stack, from servers and storage to applications. Discover why MySQL is a best of breed database solution for: Web-based applications, including the next generation of highly demanding web, cloud, mobile and social application Distributed applications requiring a powerful and reliable embedded database Custom and departmental enterprise applications on Windows and other platforms Check out our Resource Center to get access to white papers and other resources. And, remember to register for MySQL Connect if you haven’t done so yet. You can still save US$ 300 over the on-site fee – Register Now!

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  • Google migre AdWords de MySQL vers F1, son nouveau SGBDR distribué, développé en interne qui combine le meilleur de NoSQL et SQL

    Google migre AdWords de MySQL vers F1 son nouveau SGBDR distribué développé en interne qui combine le meilleur de NoSQL et SQL Google a développé en catimini son propre gestionnaire de base de données relationnelle. La société a déplacé récemment plusieurs de ses services de publicité de MySQL vers F1, un nouveau SGDBR « Fault-Tolerant Distributed » développé en interne. Présenté lors du forum SIGMOD 2012 de Scottsdale en Arizona sur les bases de données, F1 combine les meilleures approches des SGBDR et des bases de données NoSQL, selon la division Google Research, à l'origine du projet. F1 est essentiellement centré autour de l'évolutivité, la tolérance aux pann...

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  • If I use locks, can my algorithm still be lock-free?

    - by Joe Pension
    A common definition of lock-free is that at least one process makes progress. 1 If I have a simple data structure such as a queue, protected by a lock, then one process can always make progress, as one process can acquire the lock, do what it wants, and release it. So does it meet the definition of lock-free? 1 See eg M. Herlihy, V. Luchangco, and M. Moir. Obstruction-free synchronization: Double-ended queues as an example. In Distributed Computing, 2003. "It is lock-free if it ensures only that some thread always makes progress".

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  • I want to increase the size of my boot partition (Ubuntu 14.04 version) [duplicate]

    - by Mike
    This question already has an answer here: How do I free up more space in /boot? 11 answers How to resize partitions? 5 answers I read in another post that kernels are distributed as new releases rather than upgrades. I didn't know this when I was allocating space to my partitions during my initial install of Ubuntu. As a result I ran out of space on my boot partition. Can I increase the size of it using GParted and how do I do this without doing damage to my system? 1 1049kB 512MB 511MB fat32 boot 2 512MB 768MB 256MB ext2 3 768MB 1000GB 999GB lvm Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/ubuntu--vg-swap_1: 3712MB Sector size (logical/physical): 512B/4096B Partition Table: loop Number Start End Size File system Flags 1 0.00B 3712MB 3712MB linux-swap(v1) Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/ubuntu--vg-root: 996GB Sector size (logical/physical): 512B/4096B Partition Table: loop Number Start End Size File system Flags 1 0.00B 996GB 996GB ext4 Sorry, don't know how to capture and post the terminal output screen.

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  • Safest way (i.e. HTTPS, POST, PGP) to send decryption keys through the web?

    - by theGreenCabbage
    I am in the final stages of development for my Revit plugin. This plugin is programmed in C#, and distributed via a DLL. One of the DLLs is an encrypted SQLite database (with proprietary data) that is in the form of a DLL. Currently, in development stages, the decryption key for the SQLite database is hardcoded in my main DLL (the program's DLL). For distribution, since DLLs are easily decompilable, I am in need of a new method to decrypt the DLL. My solution is to send our decryption keys from our servers securely to the host's computer. I was looking in POST, thinking it was more secure than GET, but upon research, it appears it's similarly insecure, only more "obscure" than GET. I also looked into HTTPS, but Hostgator requires extra money for HTTPS use. I am in need of some advice - are there any custom solutions I can do to implement this?

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  • What would one call this architecture?

    - by Chris
    I have developed a distributed test automation system which consists of two different entities. One entity is responsible for triggering tests runs and monitoring/displaying their progress. The other is responsible for carrying out tests on that host. Both of these entities retrieve data from a central DB. Now, my first thought is that this is clearly a server-client architecture. After all, you have exactly one organizing entity and many entities that communicate with said entity. However, while the supposed clients to communicate to the server via RPC, they are not actually requesting services or information, rather they are simply reporting back test progress, in fact, once the test run has been triggered they can complete their tasks without connection to the server. The request for a service is actually made by the supposed server which triggers the clients to carry out tests. So would this still be considered a server-client architecture or is this something different?

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  • Even distribution through a chain of resources

    - by ClosetGeek
    I'm working on an algorithm which routes tasks through a chain of distributed resources based on a hash (or random number). For example, say you have 10 gateways into a service which distribute tasks to 1000 handlers through 100 queues. 10,000 connected clients are expected to be connected to gateways at any given time (numbers are very general to keep it simple). Thats 10,000 clients 10 gateways (producers) 100 queues 1000 workers/handlers (consumers) The flow of each task is client-gateway-queue-worker Each client will have it's own hash/number which is used to route each task from the client to the same worker each time, with each task going through the same gateway and queue each time. Yet the algorithm handles distribution evenly, meaning each gateway, queue, and worker will have an even workload. My question is what exactly would this be called? Does such a thing already exist? This started off as a DHT, but I realized that DHTs can't do exactly what I need, so I started from scratch.

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  • How to elegantly work with a lot of print functions?

    - by user1824372
    I'm working on a Python project that is executed on a terminal (or console) for which I am planning to implement a GUI. I did not major in CS so I really have no idea how to effectively design a terminal GUI such that: the user interface looks good in GUI, it is directed to a certain widget, let's say, a text label, or a bottom bar, or a hide-able frame. Do you have any suggestions? Currently, I am using the print function to provide essential information on STDOUT during execution, so a lot of print calls are distributed here and there in the code. I'm thinking of using macro-like variables such as 'FILE_NOT_EXISTS_MESSAGE' for printing, and all of them and their values would be defined in one file. Is that a standard way to do this? Should I introduce a logging system? In summary, I'm looking for a pattern for handling console output that is effective and adaptable.

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  • Help with off-game tasks

    - by peoro
    I love writing video games for fun, and often do that. I noticed, anyway, that most of the times implementing the gameplay itself doesn't take too much time to me (maybe because I already did that plenty times and know what and how to do for most of the things), but when I try to implement off-game stuff I get lost. By off-game I mean what is not gameplay: menus, cutscenes between levels, world map to choose levels, saving and loading status, managing replays ... Only tried to write a few of these a few times, but always failed; that's why I never really completed and distributed a game. Are these common problems? And where should I start to do this? Where could I find some books/guides about such stuff?

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  • C++ cin keeps skipping.....

    - by user69514
    I am having problems with my program. WHen I run it, it asks the user for the album, the title, but then it just exits the loop without asking for the price and the sale tax. Any ideas what's going on? This is a sample run Discounts effective for September 15, 2010 Classical 8% Country 4% International 17% Jazz 0% Rock 16% Show 12% Are there more transactions? Y/N y Enter Artist of CD: Sevendust Enter Title of CD: Self titled Enter Genre of CD: Rock enter price Are there more transactions? Y/N Thank you for shopping with us! Program code: #include <iostream> #include <string> using namespace std; int counter = 0; string discount_tiles[] = {"Classical", "Country", "International", "Jazz", "Rock", "Show"}; int discount_amounts[] = {8, 4, 17, 0, 16, 12, 14}; string date = "September 15, 2010"; // Array Declerations //Artist array char** artist = new char *[100]; //Title array char** title = new char *[100]; //Genres array char** genres = new char *[100]; //Price array double* price[100]; //Discount array double* tax[100]; // sale price array double* sale_price[100]; //sale tax array double* sale_tax[100]; //cash price array double* cash_price[100]; //Begin Prototypes char* getArtist(); char* getTitle(); char* getGenre(); double* getPrice(); double* getTax(); unsigned int* AssignDiscounts(); void ReadTransaction (char ** artist, char ** title, char ** genre, float ** cash, float & taxrate, int albumcount); void computesaleprice(); bool AreThereMore (); //End Prototypes bool areThereMore () { char answer; cout << "Are there more transactions? Y/N" << endl; cin >> answer; if (answer =='y' || answer =='Y') return true; else return false; } char* getArtist() { char * artist= new char [100]; cout << "Enter Artist of CD: " << endl; cin.getline(artist,100); cin.ignore(); return artist; } char* getTitle() { char * title= new char [100]; cout << "Enter Title of CD: " << endl; cin.getline(title,100); cin.ignore(); return title; } char* getGenre() { char * genre= new char [100]; cout << "Enter Genre of CD: " << endl; cin.getline(genre,100); cin.ignore(); return genre; } double* getPrice() { //double* price = new double(); //cout << "Enter Price of CD: " << endl; //cin >> *price; //return price; double p = 0.0; cout<< "enter price" << endl; cin >> p; cin.ignore(); double* pp = &p; return pp; } double* getTax() { double* tax= new double(); cout << "Enter local sales tax: " << endl; cin >> *tax; return tax; } int findDiscount(string str){ if(str.compare(discount_tiles[0]) == 0) return discount_amounts[0]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[1]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[2]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[3]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[4]; else if(str.compare(discount_tiles[0]) == 0) return discount_amounts[5]; else{ cout << "Error in findDiscount function" << endl; return 0; } } void computesaleprice() { /** fill in array for all purchases **/ for( int i=0; i<=counter; i++){ double temp = *price[i]; temp -= findDiscount(genres[i]); double* tmpPntr = new double(); tmpPntr = &temp; sale_price[i] = tmpPntr; delete(&temp); delete(tmpPntr); } } void printDailyDiscounts(){ cout << "Discounts effective for " << date << endl; for(int i=0; i < 6; i++){ cout << discount_tiles[i] << "\t" << discount_amounts[i] << "%" << endl; } } //Begin Main int main () { for( int i=0; i<100; i++){ artist[i]=new char [100]; title[i]=new char [100]; genres[i]=new char [100]; price[i] = new double(0.0); tax[i] = new double(0.0); } // End Array Decleration printDailyDiscounts(); bool flag = true; while(flag == true){ if(areThereMore() == true){ artist[counter] = getArtist(); title[counter] = getTitle(); genres[counter] = getGenre(); price[counter] = getPrice(); //tax[counter] = getTax(); //counter++; flag = true; } else { flag = false; } } //compute sale prices //computesaleprice(); cout << "Thank you for shopping with us!" << endl; return 0; } //End Main /** void ReadTransaction (char ** artist, char ** title, char ** genre, float ** cash, float & taxrate, int albumcount) { strcpy(artist[albumcount],getArtist()); strcpy(title[albumcount],getTitle()); strcpy(genre[albumcount],getGenre()); //cash[albumcount][0]=computesaleprice();??????? //taxrate=getTax;?????????????? } * * */ unsigned int * AssignDiscounts() { unsigned int * discount = new unsigned int [7]; cout << "Enter Classical Discount: " << endl; cin >> discount[0]; cout << "Enter Country Discount: " << endl; cin >> discount[1]; cout << "Enter International Discount: " << endl; cin >> discount[2]; cout << "Enter Jazz Discount: " << endl; cin >> discount[3]; cout << "Enter Pop Discount: " << endl; cin >> discount[4]; cout << "Enter Rock Discount: " << endl; cin >> discount[5]; cout << "Enter Show Discount: " << endl; cin >> discount[6]; return discount; } /** char ** AssignGenres () { char ** genres = new char * [7]; for (int x=0;x<7;x++) genres[x] = new char [20]; strcpy(genres [0], "Classical"); strcpy(genres [1], "Country"); strcpy(genres [2], "International"); strcpy(genres [3], "Jazz"); strcpy(genres [4], "Pop"); strcpy(genres [5], "Rock"); strcpy(genres [6], "Show"); return genres; } **/ float getTax(float taxrate) { cout << "Please enter store tax rate: " << endl; cin >> taxrate; return taxrate; }

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  • 'Microsoft.ACE.OLEDB.12.0' 64x Sql Server and 86x Office???

    - by Chris
    The error: OLE DB provider 'Microsoft.ACE.OLEDB.12.0' cannot be used for distributed queries because the provider is configured to run in single-threaded apartment mode. And the answers I'm seeing is a conflict between 64 bit Sql Server and 32 bit Office. Is there a way to run an openrowset on Excel into Sql Server? insert into dbo.FiscalCalendar select * from openrowset('Microsoft.ACE.OLEDB.12.0', 'Excel 12.0 Xml;Database=C:\Users\v-chrha\Desktop\fy11.xlsx;', 'Select * from [Sheet1]')

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