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• Simple issue tracker for 1-2 developers

  - by devoured elysium

  (I'm not sure whether this pertains to the realm of programmers@se or so@se) I'm currently working mostly alone on a project (in Java). I'm mostly alone as I have an advisor that gives me high level instructions on what to do, and will seldom make any code contribution. She will code in a couple of acceptance tests from time to time, though. I've never used an Issue Tracker before, and was thinking about starting to use one now, as I'd like to have a place where I can log possible bugs I find and keep track of them in a centralized manner. Would it be possible to integrate the issue tracker with Eclipse, better yet. So here are the constraints: It's NOT a open-source project. Our code is not to be shared with anyone! we are and will be using Subversion; we have our own Subversion server and we will keep using this same Subversion server; it must be free; it must allow at least 2 users. What is your advice on what to pick? I'm looking for the simplest solution available!

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• How to properly learn ASP.NET MVC

  - by Qmal

  Hello everyone, I have a question to ask and maybe some of you will think it's lame, but I hope someone will get me on the right track. So I've been programming for quite some time now. I started programming when I was about 13 or so on Delphi, but when I was about 17 or so I switched to C# and now I really like to program with it, mostly because it's syntax is very appealing to me, plus managed code is very good. So it all was good and fun but then I had some job openings that I of course took, but the problem with them is that they all are about web programming. And I had to learn PHP and MVC fundamentals. And I somewhat did while building applications using CI and Kohana framework. But I want to build websites using ASP.NET because I like C# much, much more than PHP. TL;DR I want to know ASP.NET MVC but I don't know where to start. What I want to start with is build some simple like CMS. But I don't know where to start. Do I use same logic as PHP? What do I use for DB connections? And also, if I plan to host something that is build with ASP.NET MVC3 on a hosting provider do I need to buy some kind of license?

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• Dividing up spritesheet in Javascript

  - by hustlerinc

  I would like to implement an object for my spritesheets in Javascript. I'm very new to this language and game-developement so I dont really know how to do it. My guess is I set spritesize to 16, use that to divide as many times as it fits on the spritesheet and store this value as "spritesheet". Then a for(i=0;i<spritesheet.length;i++) loop running over the coordinates. Then tile = new Image(); and tile.src = spritesheet[i] to store the individual sprites based on their coordinates on the spritesheet. My problem is how could I loop trough the spritesheet and make an array of that? The result should be similar to: var tile = Array( "img/ground.png", "img/crate.png" ); If possible this would be done with one single object that i only access once, and the tile array would be stored for later reference. I couldn't find anything similar searching for "javascript spritesheet". Edit: I made a small prototype of what I'm after: function Sprite(){ this.size = 16; this.spritesheet = new Image(); this.spritesheet.src = 'img/spritesheet.png'; this.countX = this.spritesheet.width / 16; this.countY = this.spritesheet.height / 16; this.spriteCount = this.countX * this.countY; this.divide = function(){ for(i=0;i<this.spriteCount;i++){ // define spritesheet coordinates and store as tile[i] } } } Am I on the right track?

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• Breadcrumbs in a modern web application, make sense? [on hold]

  - by Xtreme Biker

  I'm currently beginning with the development of a new web application. The whole web application is going to be bookmarkable and all the pages accesible via GET requests and url parameters. Having said that, let's suppose I've got three entities in my application, Customer, Team and City. Each Customer and Team belong to a city and I've got a city-detail page which displays the detail for a concrete city. So next navigation cases are possible: Customers - Customer detail (id=2) - City detail (id=3) Football teams - Team detail (id=5) - City detail (id=3) Cities - City detail (id=3) There are three possible ways of ending up in a city detail view. My question is, does it make sense to implement a breadcrumb to show such a history, having it available in the browser itself? Would it be more appropiate to show a breadcrumb with the last case, no matter where we're coming from (hierarchical breadcrumb)? That's what Jakob Nielsen points out here: Offering users a Hansel-and-Gretel-style history trail is basically useless, because it simply duplicates functionality offered by the Back button, which is the Web’s second-most-used feature. A history trail can also be confusing: users often wander in circles or go to the wrong site sections. Having each point in a confused progression at the top of the current page doesn’t offer much help. Finally, a history trail is useless for users who arrive directly at a page deep within the site. Also, even if the history trail seems the most natural way to implement it, it requires an extra effort to keep the whole track being HTTP a stateless mean.

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• External USB hard-drive changing drive letter

  - by Sydius

  I have a Seagate FreeAgent Go external USB hard drive that was mounted but mysteriously decided to reconnect itself: Sep 30 15:07:06 feinman kernel: [243901.551604] usb 1-1.2: USB disconnect, device number 3 Sep 30 15:07:06 feinman kernel: [243901.553828] sd 6:0:0:0: [sdb] Synchronizing SCSI cache Sep 30 15:07:06 feinman kernel: [243901.553893] sd 6:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK Sep 30 15:07:10 feinman kernel: [243905.336557] usb 1-1.2: new high-speed USB device number 4 using ehci_hcd Sep 30 15:07:10 feinman kernel: [243905.431219] scsi7 : usb-storage 1-1.2:1.0 Sep 30 15:07:11 feinman kernel: [243906.427207] scsi 7:0:0:0: Direct-Access Seagate FreeAgent Go 0148 PQ: 0 ANSI: 4 Sep 30 15:07:11 feinman kernel: [243906.428303] sd 7:0:0:0: Attached scsi generic sg1 type 0 Sep 30 15:07:11 feinman kernel: [243906.430317] sd 7:0:0:0: [sdc] 625142447 512-byte logical blocks: (320 GB/298 GiB) Sep 30 15:07:11 feinman kernel: [243906.430860] sd 7:0:0:0: [sdc] Write Protect is off Sep 30 15:07:11 feinman kernel: [243906.430865] sd 7:0:0:0: [sdc] Mode Sense: 1c 00 00 00 Sep 30 15:07:11 feinman kernel: [243906.431386] sd 7:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Sep 30 15:07:11 feinman kernel: [243906.493674] sdc: sdc1 Sep 30 15:07:11 feinman kernel: [243906.496109] sd 7:0:0:0: [sdc] Attached SCSI disk It changed from sdb to sdc, causing a number of problems for me. What can I do to further track down the cause? I thought it might be a problem with it sleeping but when I cat /sys/class/scsi_disk/6\:0\:0\:0/allow_restart, I see that it's already 1.

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• using a wiki for requirements

  - by apollodude217

  Hi, I'm looking into ways of improving requirements management. Currently, we have a Word document published on a Web site. Unfortunately, we cannot (to my knowledge) look at changes from one revision to the next. I would greatly prefer to be able to do so, much like with a wiki or VCS (or both, like the wiki's on bitbucket!). Also, each document describes changes devs are expected to meet by a given deadline. There is no collection of accumulated app features documented anywhere, so it's sometimes hard to distinguish between a bug and a (poorly-designed) feature when trying to make quick fixes to legacy apps. So I had an idea I wanted to get feedback on. What about: Using a wiki so that we can track who changed what when (mostly to even see if any edits were made since the last time one looked). Having one, say, wiki page per product rather than one per deadline, keeping up with all features of the product rather than the changes that should be implemented. This way, I can look at a particular revision of the page to see what the app should do at a given point in time, and I can look at changes to the page since the last release for the requirements to be implemented by the next deadline. Waddayathink?

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• How to Enable User-Specific Wireless Networks in Windows 7

  - by The Geek

  Wireless network settings in Windows 7 are global across all users, but there’s a little-known option that lets you switch them to per-user, so each user has access to only the networks they are allowed to connect to. Here’s how it all works. How is this useful? Maybe you want to prevent a particular user from accessing the internet—if you don’t give them the wireless password, they won’t be able to get online. This could be very useful if you’ve got mini-people playing games on the family PC, but you don’t want them getting online Latest Features How-To Geek ETC How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware The Citroen GT – An Awesome Video Game Car Brought to Life [Video] Final Man vs. Machine Round of Jeopardy Unfolds; Watson Dominates Give Chromium-Based Browser Desktop Notifications a Native System Look in Ubuntu Chrome Time Track Is a Simple Task Time Tracker Google Sky Map Turns Your Android Phone into a Digital Telescope Walking Through a Seaside Village Wallpaper

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• SSIS Denali as part of “Enterprise Information Management”

  - by jorg

  When watching the SQL PASS session “What’s Coming Next in SSIS?” of Steve Swartz, the Group Program Manager for the SSIS team, an interesting question came up: Why is SSIS thought of to be BI, when we use it so frequently for other sorts of data problems? The answer of Steve was that he breaks the world of data work into three parts: Process of inputs BI   Enterprise Information Management All the work you have to do when you have a lot of data to make it useful and clean and get it to the right place. This covers master data management, data quality work, data integration and lineage analysis to keep track of where the data came from. All of these are part of Enterprise Information Management. Next, Steve told Microsoft is developing SSIS as part of a large push in all of these areas in the next release of SQL. So SSIS will be, next to a BI tool, part of Enterprise Information Management in the next release of SQL Server. I'm interested in the different ways people use SSIS, I've basically used it for ETL, data migrations and processing inputs. In which ways did you use SSIS?

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• What relationship do software Scrum or Lean have to industrial engineering concepts like theory of constraints?

  - by DeveloperDon

  In Scrum, work is delivered to customers through a series of sprints in which project work is time boxed to a fixed number of days or weeks, usually 30 days. In lean software development, the goal is to deliver as soon as possible, permitting early feedback for the next iteration. Both techniques stress the importance of workflow in which software work product does not accumulate in development awaiting release at some future date. Both permit new or refined requirements and feedback from QA and customers to be acted on with as little delay as possible based on priority. A few years ago I heard a lecture where the speaker talked briefly about a family of concepts from industrial engineering called theory of constraints. In the factory, they use an operations model based on three components: drum, buffer, and rope. The drum synchronizes work product as it flows through the system. Buffers that protect the system by holding output from one stage as it waits to be consumed by the next. The rope pulls product from one work station to the next. Historically, are these ideas part of the heritage of Scrum and Lean, or are they on a separate track? It we wanted to think about Scrum and Lean in terms of drum-buffer-rope, what are the parts? Drum = {daily scrum meeting, monthly release)? Buffer = {burn down list, source control system)? Rope = { daily meeting, constant integration server, monthly releases}? Industrial engineers define work flow in terms of different kinds of factories. I-Factories: straight pipeline. One input, one output. A-Factories: many inputs and one output. V-Factories: one input, many output products. T-Plants: many inputs, many outputs. If it applies, what kind of factory is most like Scrum or Lean and why?

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• Help Creating a Google Analytics Funnel for Check out process

  - by Drew

  have a funnel question. I am currently working on tracking (through GA) guest and logged in member activity once they get to my sites shopping cart. But need help with setting up funnels. Specifically to see; Total sales Logged in member total sales List item Guest member sales The urls associated to the check out proces are: Logged in members /cart (arriving to checkout) /checkout (checking out as a logged in member) /checkout/confirmation (thank you - confirmed sale) Guest members - /cart (arriving to checkout) - /checkout-guest (checking out as a guest) - /checkout/confirmation (thanks you - confirmed sale) I've tested the funnels set up for the above with 9 transactions. But the end maths doesn't seem to line up. Total sales funnel shows 9 completed transactions when only tracking these to urls: - /cart - /checkout/confirmation Which is great - cause it's working Logged in member sales show a total of 9 completed transactions based on each step of the logged in url steps (above) being tracked in a funnel. Not good because this number should be 3. Guest check out funnel (see guest steps above) shows 9 as well. What the?!?!?!? The results I am looking for should reflect the following - total sales = 9, logged in members = 3, guest members = 6 Is there any way to set these urls up so that the funnels report the correct results - or do I need to changed the urls and provide logged in members and guest stand alone purchase confirmation pages (this would mean I can not track total sales which combine results from both streams)? Any knowledge in this area is welcome. Thanks.

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• Saudi Arabian Retail Distribution Business Ajlan & Bros Selects Oracle Commerce

  - by Marie-Christin Hansen

  Ajlan & Bros has selected Oracle Commerce in a bid to improve its customer engagement capabilities and drive its expansion plans. The large Middle Eastern retail distribution business, which specializes in the design, manufacture and supply of clothing across the Middle East, is seeking to expand its operations, which consist of a distribution network of more than 7,000 points of sale and represent more than 15 international brands. The business is aiming to build brand awareness globally with an interest in the European and American markets. Choosing Oracle Commerce will provide Ajlan & Bros with the capability to optimize each customer engagement, which will help to increase cross-channel promotion and improve a unified online, mobile and social experience for customers. The company will be able to leverage Oracle Commerce’s advanced marketing and personalization capabilities, with enhanced integrated search and content management functionality across its channels. The selection of Oracle Commerce followed an extensive evaluation of competitor solutions, with Oracle selected due to the solutions strong capabilities in cross-channel ecommerce and customer experience management, as well as a solid track record of maintaining best practice. Press release: Ajlan & Bros Selects Oracle Commerce to Support Expansion Strategy

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• Custom inventory items based on inheritance

  - by Bogdan Marginean

  So, here's the scenario: I'm building an RPG. Like most of the other RPGs on the market, my game will feature an inventory and of course, inventory items. So far I've worked well with using a single class for all items, because I did not need anything else than character stat alteration on item usage (consumption). However, I'd like some items to have a more exotic effect. Think of something like when the user consumes a transformation potion, he automatically turns into a beast. In order to achieve this I've thought about declaring a new class that inherits from BaseItem for each item. Each descendant would override some methods (like void OnConsume()), to change the base behavior. This works fine, but when it comes to inventory management, I have some issues. The actual inventory will have to work with BaseItem components only (for obvious reasons, as it's an enumerable collection of objects of the same type); casting any descendant to the base class is possible, so no problems in adding items to the inventory. But how can I keep track of the descendant's type (class) for each item in the inventory? And how to perform the descendant's OnConsume from withint he inventory, for each item? Let me know if you can think of a better solution than mine, or if you can think of a solution to my problem only. Development is done in C#, inside Unity 3.5. Thanks!

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• Mapping dynamic buffers in Direct3D11 in Windows Store apps

  - by Donnie

  I'm trying to make instanced geometry in Direct3D11, and the ID3D11DeviceContext1->Map() call is failing with the very helpful error of "Invalid Parameter" when I'm attempting to update the instance buffer. The buffer is declared as a member variable: Microsoft::WRL::ComPtr<ID3D11Buffer> m_instanceBuffer; Then I create it (which succeeds): D3D11_BUFFER_DESC instanceDesc; ZeroMemory(&instanceDesc, sizeof(D3D11_BUFFER_DESC)); instanceDesc.Usage = D3D11_USAGE_DYNAMIC; instanceDesc.ByteWidth = sizeof(InstanceData) * MAX_INSTANCE_COUNT; instanceDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER; instanceDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE; instanceDesc.MiscFlags = 0; instanceDesc.StructureByteStride = 0; DX::ThrowIfFailed(d3dDevice->CreateBuffer(&instanceDesc, NULL, &m_instanceBuffer)); However, when I try to map it: D3D11_MAPPED_SUBRESOURCE inst; DX::ThrowIfFailed(d3dContext->Map(m_instanceBuffer.Get(), 0, D3D11_MAP_WRITE, 0, &inst)); The map call fails with E_INVALIDARG. Nothing is NULL incorrectly, and this being one of my first D3D apps I'm currently stumped on what to do next to track it down. I'm thinking I must be creating the buffer incorrectly, but I can't see how. Any input would be appreciated.

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• Concurrency with listeners and upload: is this solution sound?

  - by cbrulak

  I'm working on an Android app. We have listeners for position data and camera capture which is timed on a background thread (not a service). The timer thread dictates when the image is captured and also when the data is cached in a local sqlite db. So, my question is how to properly store the location data as it comes in based on the listeners and pull that data so that the database can be updated as the camera capture is executed. I can't put the location data into the database as it arrives because it is processed more frequently than the camera images and the camera images are what dominates the architecture at the moment. (Location data is supplement). However I need the location data to get a rough location of the where the image is captured. My first thought was to have singleton store the location data. And have a semaphore on the getInstance method so if the database update is happening (after an image is captured) we don't have an error. The location data can wait for the database update or it can be lost for that particular event it doesn't really matter. What are you thoughts? Am I on the right track? (And is this the right sub-site or would this be better on stackoverflow?)

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• Can't get sprite to rotate correctly?

  - by rphello101

  I'm attempting to play with graphics using Java/Slick 2d. I'm trying to get my sprite to rotate to wherever the mouse is on the screen and then move accordingly. I figured the best way to do this was to keep track of the angle the sprite is at since I have to multiply the cosine/sine of the angle by the move speed in order to get the sprite to go "forwards" even if it is, say, facing 45 degrees in quadrant 3. However, before I even worry about that, I'm having trouble even getting my sprite to rotate in the first place. Preliminary console tests showed that this code worked, but when applied to the sprite, it just kind twitches. Anyone know what's wrong? int mX = Mouse.getX(); int mY = HEIGHT - Mouse.getY(); int pX = sprite.x; int pY = sprite.y; int tempY, tempX; double mAng, pAng = sprite.angle; double angRotate=0; if(mX!=pX){ tempY=pY-mY; tempX=mX-pX; mAng = Math.toDegrees(Math.atan2(Math.abs((tempY)),Math.abs((tempX)))); if(mAng==0 && mX<=pX) mAng=180; } else{ if(mY>pY) mAng=270; else mAng=90; } //Calculations if(mX<pX&&mY<pY){ //If in Q2 mAng = 180-mAng; } if(mX<pX&&mY>pY){ //If in Q3 mAng = 180+mAng; } if(mX>pX&&mY>pY){ //If in Q4 mAng = 360-mAng; } angRotate = mAng-pAng; sprite.angle = mAng; sprite.image.setRotation((float)angRotate);

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• How to manage long running background threads and report progress with DDD

  - by Mr Happy

  Title says most of it. I have found surprising little information about this. I have a long running operation of which the user wants to see the progress (as in, item x of y processed). I also need to be able to pause and stop the operation. (Stopping doesn't rollback the items already processed.) The thing is, it's not that each item takes a long time to get processed, it's that that there are usually a lot of items. And what I've read about so far is that it's somewhat of an anti-pattern to put something like a queue in the DB. I currently don't have any messaging system in place, and I've never worked with one either. Another thing I read somewhere is that progress reporting is something that belongs in the application layer, but it didn't go into the details. So having said all this, what I have in mind is the following. User request with list of items enters the application layer. Application layer gets some information from the domain needed to process the items. Application layer passes the items and the information off to some domain service (should the implementation of this service belong in the infrastructure layer?) This service spins up a worker thread with callbacks for both progress reporting and pausing/stopping it. This worker thread will process each item in it's own UoW. This means the domain information from earlier needs to be stored in some DTO. Since nothing is really persisted, the service should be singleton and thread safe Whenever a user requests a progress report or wants to pause/stop the operation, the application layer will ask the service. Would this be a correct solution? Or am I at least on the right track with this? Especially the singleton and thread safe part makes the whole thing feel icky.

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• REST Service and CQRS

  - by Paul Wade

  I am struggling with architecture on a new project. I am using the following patterns/technology. CQRS - anything going in goes through a command REST - using WebAPI MVC - asp.net mvc Angular - building a spa nhibernate I belive this provides some great separation and should help keep a very complex domain from growing into a giant set of services that mix queries with other business logic. The REST services have become non restful. They are putting methods in rest that are "SearchByDate", "SearchByItem" etc. Service Methods that execute commands are called with a "web" model class, a new command is built in the service and executed, I feel like there is a lot of extra code. I expected this to be much different but I wasn't around to keep things on track. Finally my questions are this... I would have liked to see PUT Person (CreatePersonCommand) but then I realized that isn't restful either is it? the put should be a person entity not a command. Can I make CQRS and REST service work together or am I going about this all wrong? How do I handle service methods that don't fit into a REST model. I am not performing CRUD on the object but rather executing some business logic. I.E. I don't want the UI to be responsible for how a shipment is "unshipped" I want the service layer to worry about that.

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• Precautions during SSH

  - by Shagun

  I recently had to give away my Ubuntu 12.10 root password to one of my friends so that he could SSH into my system and send some files to me. Now he is my friend and I trust him so I was not reluctant in sharing my password. And I did change it afterwards. But it just struck me how can I view all the commands that were executed by some other user remote logging into my system (obviously not my friend. I mean in general).To what extent can they access my data (especially my passwords eg I use Last Pass so can they access my account passwords as well??) And if they open any browser after logging into my system do they have access to all my passwords provided I have saved them using the "remember password" option given by chrome Also what precautions I should take when I am allowing some one to remote login in my system and how can I track the various commands used by them or the changes they made in my system. Also is there some simple way to get notified whenever some one logs into my system apart from checking the /var/log/auth.log file??

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• Oracle SOA Governance EMEA Workshop for Partners & System Integrators: Nov 5-7th | Madrid, Spain

  - by Lionel Dubreuil

  The EMEA Fusion Middleware Product Management team is delighted to announce an exciting and a much-awaited workshop on our market-leading SOA Governance offering. Oracle SOA Governance solution is Oracle Fusion Middleware's strategic approach to governing SOA. Whether just embarking on an SOA program, or expanding from project or pilot to broader deployment, the Oracle SOA Governance solution closes the loop on measuring SOA success from project inception through to realization, and providing the proof of ROI on SOA. Would your prospects and customers like to: Align their SOA Vision and Execution Improve Decision Making Effectively Manage Business and Technology Change Enable Control Foster Enterprise-wide Collaboration Reduce Development Costs Track their SOA Investments and Returns Demonstrate business value and ROI of SOA This FREE hands-on workshop is dedicated to EMEA Partners & System Integrators (SIs). It'll be delivered by Oracle HQ Product Management and will primarily focus on : SOA Governance as a Strategy and Methodology Hands-on with Oracle Enterprise Repository (OER) and Oracle Service Registry (OSR) When, how and whom to position our SOA Governance offerings Our SOA Governance Rapid Start Service Hands-on sessions for the most popular customer use cases Seats are limited, book now - you cannot afford to miss this training! If you're interested please contact Yogesh Sontakke (yogesh.sontakke-AT-oracle-DOT-com)

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• Oracle SOA Governance EMEA Workshop for Partners & System Integrators: Nov 5-7th | Madrid, Spain

  - by Lionel Dubreuil

  The EMEA Fusion Middleware Product Management team is delighted to announce an exciting and a much-awaited workshop on our market-leading SOA Governance offering. Oracle SOA Governance solution is Oracle Fusion Middleware's strategic approach to governing SOA. Whether just embarking on an SOA program, or expanding from project or pilot to broader deployment, the Oracle SOA Governance solution closes the loop on measuring SOA success from project inception through to realization, and providing the proof of ROI on SOA. Would your prospects and customers like to: Align their SOA Vision and Execution Improve Decision Making Effectively Manage Business and Technology Change Enable Control Foster Enterprise-wide Collaboration Reduce Development Costs Track their SOA Investments and Returns Demonstrate business value and ROI of SOA This FREE hands-on workshop is dedicated to EMEA Partners & System Integrators (SIs). It'll be delivered by Oracle HQ Product Management and will primarily focus on : SOA Governance as a Strategy and Methodology Hands-on with Oracle Enterprise Repository (OER) and Oracle Service Registry (OSR) When, how and whom to position our SOA Governance offerings Our SOA Governance Rapid Start Service Hands-on sessions for the most popular customer use cases Seats are limited, book now - you cannot afford to miss this training! If you're interested please contact Yogesh Sontakke: [email protected].

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• Silverstripe: How can I disable comments?

  - by SamIAm

  My client site is built in Silverstripe, there is a news page, and it allows people to leave comments. Unfortunately we've got loads of spam emails. I'm new to this, is there any way we can disable the comment field by default? How do I do it? Alternatively is there easy way for me to install a spam protection? Update - Because this is someone else's code, I just realised that they have some sort of spam protection already, so we are trying to disable comments now. I have manage to set no comment as default by changing file BlogEntry.php static $defaults = array( "ProvideComments" => true, 'ShowInMenus' => false ); to static $defaults = array( "ProvideComments" => false, //changed 'ShowInMenus' => false ); Am I on the right track to disable comments by default? Also how can I stop on the news page showing xxx comments link? eg Test Posted by Admin on 21 June 2011 | 3 Comments Tags: P This is a test.... 3 comments | Read the full post

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• Many small scripts, one repository or multiple?

  - by The Jug

  A co-worker and myself have run into an issue that we have multiple opinions on. Currently we have a git repository that we are keeping all of our cronjobs in. There are about 20 crons and they are not really related except for the fact that they are all small python scripts and essential for some activity. We are using a fabric.py file to deploy and a requirements.txt file to manage requirements for all of the scripts. Our issue is basically, do we keep all of these scripts in one git repository or should we be separating them out into their own repositories? By keeping them in one repository it is easier to deploy them onto one server. We can use just one cron file for all the scripts. However this feels wrong, as the 20 cronjobs are not logically related. Additionally, when using one requirements.txt file for all the scripts, it's hard to figure out what the dependencies are for a particular script and they all have to use the same versions of packages. We could separate all of the scripts out into their own repositories but this creates 20 different repositories that need to be remembered and dealt with. Most of these scripts are not very large and that solution seems to be overkill. A related question is, do we use one big crontab file for all cronjobs, or a separate file for each? If each has their own, how does one crontab's installation avoid overwriting the other 19? This also seems like a pain as there would then by 20 different cron files to keep track of. In short, our main question and issue is do we keep them all closely bundled as one repository or do we separate them out into their own repository with their own requirements.txt and fabfile.py? We feel like we're also probably looking over some really simple solution. Is there an easier way to deal with this issue?

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• The Developers Conference 2012: Presentation about CEP & BAM

  - by Ricardo Ferreira

  This year I had the pleasure again of being one of the speakers in the TDC ("The Developers Conference") event. I have spoken in this event for three years from now. This year, the main theme of the SOA track was EDA ("Event-Driven Architecture") and I decided to delivery a comprehensive presentation about one of my preferred personal subjects: Real-time using Complex Event Processing. The theme of the presentation was "Business Intelligence in Real-time using CEP & BAM" and I would like to share here the presentation that I have done. The material is in Portuguese since was an Brazilian event that happened in São Paulo. Once my presentation has a lot of videos, I decided to share the material as a Youtube video, so you can pause, rewind and play again how many times you want it. I strongly recommend you that before starting watching the video, you change the video quality settings to 1080p in High Definition.

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• Sending changes to a terrain heightmap over UDP

  - by Floomi

  This is a more conceptual, thinking-out-loud question than a technical one. I have a 3D heightmapped terrain as part of a multiplayer RTS that I would like to terraform over a network. The terraforming will be done by units within the gameworld; the player will paint a "target heightmap" that they'd like the current terrain to resemble and units will deform towards that on their own (a la Perimeter). Given my terrain is 257x257 vertices, the naive approach of sending heights when they change will flood the bandwidth very quickly - updating a quarter of the terrain every second will hit ~66kB/s. This is clearly way too much. My next thought was to move to a brush-based system, where you send e.g. the centre of a circle, its radius, and some function defining the influence of the brush from the centre going outwards. But even with reliable UDP the "start" and "stop" messages could still be delayed. I guess I could compare timestamps and compensate for this, although it'd likely mean that clients would deform verts too much on their local simulations and then have to smooth them back to the correct heights. I could also send absolute vert heights in the "start" and "stop" messages to guarantee correct data on the clients. Alternatively I could treat brushes in a similar way to units, and do the standard position + velocity + client-side prediction jazz on them, with the added stipulation that they deform terrain within a certain radius around them. The server could then intermittently do a pass and send (a subset of) recently updated verts to clients as and when there's bandwidth to spare. Any other suggestions, or indications that I'm on the right (or wrong!) track with any of these ideas would be greatly appreciated.

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• Input Handling and Game loop

  - by Bob Coder

  So, I intercept the WM_KEYDOWN and other messages. Thing is, my game can't/shouldn't react to these messages just yet, since my game might be currently drawing to the screen or in the middle of updating my game entities. So the idea is to keep a keyboardstate and mousestate, which is updated by the part of my code that intercepts the windows messages. These states just keep track of which keys/buttons are currently pressed. Then, at the start of my game's update function, I access these keyboard and mouse states and my game reacts to the user input. Now, which is the best way to access these states? I assume that windows messages can be sent whenever, so the keyboard/mouse states are constantly being edited. Accessing say a list of currently pressed keys in the keyboard state the same time another part of the code is editing the list would cause problems. Should I make a deep copy of a state and act on that? How would I deal with the garbage generated though, this would take place every frame.

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