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• MS Chart Control for ASP.NET 100% Stacked Bar Chart Question.

  - by Jacob Huggart

  Hello All, I am trying to display a chart with several different bars that represent a ratio of some values. For example, one bar may say that there are 25 items in three different groups (maybe dirty, clean, and broken) and of those 25 items x items from each category add up to the total. Later the data will dynamically change and be displayed accordingly. But for now all I want to do is be able to display three different values on the same bar. Unfortunately, whatever properties I need to bind the data to are buried somewhere in the menus and I cannot seem to find them. Do any of you guys have experience with this sort of chart?

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• ArchBeat Link-o-Rama for 2012-05-30

  - by Bob Rhubart

  Roll Your Own Solaris Blogroll | Larry Wake blogs.oracle.com Larry Wake shares an easy way to find bloggers who write about various aspects of Oracle Solaris. Updating metadata in a WebCenter Content Presenter template | Yannick Ongena yonaweb.be Oracle ACE Yannick Ongena explains "how we can add a link to the content presenter that will open a popup where we can update the metadata of the content." Enable Content editing of Iterative components | Stefan Krantz blogs.oracle.com "The key aspect of this architectural solution," explains Stefan Krantz, "is to support a data type that allows for grouping of editable elements like Plain text, Images and Rich Text, each group of elements must support a infinite amount of grouped repetitions (Rows)." Call for Nominations: Oracle Fusion Middleware Innovation Awards 2012 - Win a free pass to #OOW12 www.oracle.com These awards honor customers for their cutting-edge solutions using Oracle Fusion Middleware. Either a customer, their partner, or an Oracle representative can submit the nomination form on behalf of the customer. Submission deadline: July 17. Winners receive a free pass to Oracle OpenWorld 2012 in San Francisco. ODTUG Kscope12 - June 24-28 - San Antonio, TX kscope12.com June 24-28, 2012 San Antonio, TX Kscope12, sponsored by ODTUG, is your home for Application Express, BI and Oracle EPM, Database Development, Fusion Middleware, and MySQL training by the best of the best! Thought for the Day "CIOs and the IT department cannot stop disruptive technology changes any more than the business managers can. Business managers have to, and are, embracing the new technologies because if they don’t, they, and their business units, will become irrelevant and disappear under the competitive conditions of the market." — Andy Mulholland Source: Capgemini CTO Blog

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• How to loop section from a song correctly?

  - by Teflo

  I'm programming a little Music Engine for my game in C# and XNA, and one aspect from it is the possibility to loop a section from a song. For example, my song has an intropart, and when the song reached the end ( or any other specific point ), it jumps back where the intropart is just over. ( A - B - B - B ... ) Now I'm using IrrKlank, which is working perfectly, without any gaps, but I have a problem: The point where to jump back is a bit inaccurate. Here's some example code: public bool Passed(float time) { if ( PlayPosition >= time ) return true; return false; } //somewhere else if( song.Passed( 10.0f ) ) song.JumpTo( 5.0f ); Now the problem is, the song passes the 10 seconds, but play a few milliseconds until 10.1f or so, and then jumps to 5 seconds. It's not that dramatic, but very incorrect for my needs. I tried to fix it like that: public bool Passed( float time ) { if( PlayPosition + 3 * dt >= time && PlayPosition <= time ) return true; return false; } ( dt is the delta time, the elapsed time since the last frame ) But I don't think, that's a good solution for that. I hope, you can understand my problem ( and my english, yay /o/ ) and help me :)

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• Vernon's book Implementing DDD and modeling of underlying concepts

  - by EdvRusj

  Following questions all refer to examples presented in Implementing DDD In article we can see from Figure 6 that both BankingAccount and PayeeAccount represent the same underlying concept of Banking Account BA 1. On page 64 author gives an example of a publishing organization, where the life-cycle of a book goes through several stages ( proposing a book, editorial process, translation of the book ... ) and at each of those stages this book has a different definition. Each stage of the book is defined in a different Bounded Context, but do all these different definitions still represent the same underlying concept of a Book, just like both BankingAccount and PayeeAccount represent the same underlying concept of a BA? 2. a) I understand why User shouldn't exist in Collaboration Context ( CC ), but instead should be defined within Identity and Access Context IAC ( page 65 ). But still, do User ( IAC ), Moderator ( CC ), Author ( CC ),Owner ( CC ) and Participant ( CC ) all represent different aspects of the same underlying concept? b) If yes, then this means that CC contains several model elements ( Moderator, Author, Owner and Participant ), each representing different aspect of the same underlying concept ( just like both BankingAccount and PayeeAccount represent the same underlying concept of a BA ). But isn't this considered a duplication of concepts ( Evan's book, page 339 ), since several model elements in CC represent the same underlying concept? c) If Moderator, Author ... don't represent the same underlying concept, then what underlying concept does each represent? 3. In an e-commerce system, the term Customer has multiple meanings ( page 49 ): When user is browsing the Catalog, Customer has different meaning than when user is placing an Order. But do these two different definitions of a Customer represent the same underlying concept, just like both BankingAccount and PayeeAccount represent the same underlying concept of a BA? thanks

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• How to build a "traffic AI"?

  - by Lunikon

  A project I am working on right now features a lot of "traffic" in the sense of cars moving along roads, aircraft moving aroun an apron etc. As of now the available paths are precalculated, so nodes are generated automatically for crossings which themselves are interconnected by edges. When a character/agent spawns into the world it starts at some node and finds a path to a target node by means of a simply A* algorithm. The agent follows the path and ultimately reaches its destination. No problem so far. Now I need to enable the agents to avoid collisions and to handle complex traffic situations. Since I'm new to the field of AI I looked up several papers/articles on steering behavior but found them to be too low-level. My problem consists less of the actual collision avoidance (which is rather simple in this case because the agents follow strictly defined paths) but of situations like one agent leaving a dead-end while another one wants to enter exactly the same one. Or two agents meeting at a bottleneck which only allows one agent to pass at a time but both need to pass it (according to the optimal route found before) and they need to find a way to let the other one pass first. So basically the main aspect of the problem would be predicting traffic movement to avoid dead-locks. Difficult to describe, but I guess you get what I mean. Do you have any recommendations for me on where to start looking? Any papers, sample projects or similar things that could get me started? I appreciate your help!

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• Turn-based Client-Server Card Game - Unicast (TCP) or Multicast (UDP)

  - by LDM91

  I am currently planning to make a card game project where the clients will communicate with the server in a turn-based and synchronous manner using messages sent over sockets. The problem I have is how to handle the following scenario: (Client takes it turn and sends its action to server) Client sends a message telling the server its move for the turn (e.g. plays the card 5 from its hand which needs to placed onto the table) Server receives messages and updates game state (server will hold all game state). Server iterates through a list of connected clients and sends a message to tell of them change in state Clients all refresh to display the state This is all based on using TCP, and looking at it now it seems a bit like the Observer pattern. The reason this seems to be an issue to me is this message doesn't seem to be point-to-point like the others as I want to send it to all the clients, and doesn't seem very efficient sending the same message in that way. I was thinking about using multicasting with UDP as then I could send the message to all the clients, however wouldn't this mean that the clients would in theory be able to message each other? There is of course the synchronous aspect as well, though this could be put on top of the UDP I guess. Basically, I would like to know what would be good practice as this project is really all about learning, and even though it won't be big enough to encounter performance issues from this I would like to consider them anyway. However, please note I am not interested in using message oriented middleware as a solution (I have experience with using MOM and I'm interested in considering other options excluding MOM if TCP sockets is a bad idea!).

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• Export images from flash

  - by fabieno

  First of all let my clarify that I am a flash noob, this is a freelance job I am doing for someone. I have a flash files with symbols I need to export as PNG images, for some reason the exported images have different width and height than indicated in the flash file. After checking I found out that the new dimensions don't even keep the original ratio between height and width. This happens for several symbols at different sizes. What might be the reason for this? I have also considered finding a way to take a snapshot from within flash of a slice in the flash movie, is that possible? Understand that I cannot manually take the snapshots as I need this done on a very large quantity of symbols. Thank you

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• Library Organization in .NET

  - by Greg Ros

  I've written a .NET bitwise operations library as part of my projects (stuff ranging from get MSB set to some more complicated bitwise transformations) and I mean to release it as free software. I'm a bit confused about a design aspect of the library, though. Many of the methods/transformations in the library come with different endianness. A simple example is a getBitAt method that regards index 0 as the least significant bit, or the most significant bit, depending on the version used. In practice, I've found that using separate functions for different endianness results in much more comprehensible and reusable code than assuming all operations are little-endian or something. I'm really stumped regarding how best to package the library. Should I have methods that have LE and BE versions take an enum parameter in their signature, e.g. Endianness.Little, Endianness.Big? Should I have different static classes with identically named methods? such as MSB.GetBit and LSB.GetBit On a much wider note, is there a standard I could use in cases like this? Some guide? Is my design issue trivial? I have a perfectionist bent, and I sometimes get stuck on tricky design issues like this... Note: I've sort of realized I'm using endianness somewhat colloquially to refer to the order/place value of digital component parts (be they bits, bytes, or words) in a larger whole, in any setting. I'm not talking about machine-level endianness or serial transmission endianness. Just about place-value semantics in general. So there isn't a context of targeting different machines/transmission techniques or something.

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• Oracle Value Chain Summit 2014 - Early Bird Registration Now Open

  - by Pam Petropoulos

  Get the Best Rate on the Biggest Supply Chain Event of the Year. Register Now and save $200. Join more than 1,000 of your peers at the Value Chain Summit to learn how smart companies are transforming their supply chains into information-driven value chains. This unparalleled experience will give you the tools you need to drive innovation and maximize revenue. Date: February 3-5, 2014 Location: San Jose McEnery Convention Center Click here to learn more Thought-Leading Speakers Top minds and tech experts across industries will share the secrets of their success, firsthand. Prepare to be inspired by speakers like Geoffrey Moore, business advisor to Cisco, HP, and Microsoft and best-selling author of six books, including Crossing the Chasm. Customized Experiences Choose from more than 200 sessions offering deep dives on every aspect of supply chain management: Product Value Chain, Procurement, Maintenance, Manufacturing, Value Chain Execution, and Value Chain Planning. Unrivaled Insight & Solutions Hands-on workshops, product demonstrations, and interactive breakouts will showcase new value chain solutions and best practices to help you: -  Grow profit margins -  Build products – faster and cheaper -  Expedite delivery -  Increase customer satisfaction You don't want to miss this once-a-year event. Register Now to secure the Early Bird rate of $495 - the lowest price available.

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• Palm webOS CSS Targeting Hack?

  - by Tom

  Although it is not good practice, I am looking for a CSS hack to target Palm webOS. The problem is that Safari 3+ is awesome, and I can do some things like gradient background animations on text, but only in Safari. Right now I use @media screen and (-webkit-min-device-pixel-ratio:0) {} and it works like a charm, no Opera, Firefox, or whatever, because if I set the background to the image as I do in Safari they will all be ruined. But Palm's browser is based on webkit, and it uses the rules inside, and Palm's browser doesn't support text backgrounds so all I get is the image moving, no text. I would prefer a CSS hack, but if need be a Javascript one will do.

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• Creating avatar from uploaded image

  - by mamu

  We are using asp.net with .net 4.0 We want to allow users to upload any image and we want to create tiny avatar for uploaded image? What is the best way to convert uploaded images for avatar? We want to keep the same height width ratio if we can convert gif, bmp, jpg, png to one standard format it would be greate. Which could be the best format to convert it to? i think converting gif would be best option. am i correct? any open source option i can look at

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• Can JSON be made easily and safely editable by the non-technical Excel crowd?

  - by glitch

  I'm looking for a data storage format that's very intuitive and easy to edit. It should be ideally targeted towards the same crowd as Excel. At the same time I would like the data structure to be a tree. Ideally this would be JSON, since it offers both the tree aspect and allows for more interesting constructs like arrays. That and parsing libraries for JSON are ubiquitous, so I don't have to reinvent the wheel. The problem is that, at least with a non-specialized text editor, JSON is a giant pain to edit for a non-technical user. I'm thinking along the lines of someone who might have used Excel in the past, but never a real text editor. Someone who might not be comfortable with the idea of preserving JSON syntax by hand. Are there data formats out there that would fit this profile? I'd very much prefer this to be a JSON actually, but then it would require a solid editing tool that would hide the underlying implementation from the user. Think Excel and how it abstracts CSV syntax from the user. The reason I'm looking for something like this is because the team has been working with pretty hierarchical data for a while now and we've hit the limits of how easy it is to represent in simple CSVs without having to create complex rules for how represent hierarchy semantics from each row. Any suggestions?

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• Game Review: Monument Valley

  Once again, it was a tweet that caught my attention... and the official description on the Play Store sounds good, too. "In Monument Valley you will manipulate impossible architecture and guide a silent princess through a stunningly beautiful world. Monument Valley is a surreal exploration through fantastical architecture and impossible geometry. Guide the silent princess Ida through mysterious monuments, uncovering hidden paths, unfolding optical illusions and outsmarting the enigmatic Crow People." So, let's check it out. What an interesting puzzle game Once again, I left some review on the Play Store: "Beautiful but short distraction Woohoo, what a great story behind the game. Using optical illusions and impossible geometries in this fantastic adventure of the silent princess just puts all the pieces perfectly together. Walking the amazing paths in the various levels and solving the riddles gives some decent hours of distraction but in the end you might have the urge to do more..." I can't remember exactly when and who tweeted about the game but honestly it caught my attention based on the simplicity of the design and the aspect that it seems to be an isometric design. The game relies heavily on optical illusions in order to guide to the silent princess Ida through her illusory adventure of impossible architecture and forgiveness. The game is set like a clockwork and you are turning, flipping and switching elements on the paths between the doors. Unfortunately, there aren't many levels and the game play lasted only some hours. Maybe there are more astonishing looking realms and interesting gimmicks in future versions. Play Store: Monument Valley Also, check out the latest game updates on the official web site of ustwo BTW, the game is also available on the Apple App Store and on Amazon Store for the Kindle Fire.

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• cpnfigure open_basedir under Plesk

  - by cori

  This might be a question for ServerFault, and f it wasn't for the Plesk aspect I would ask it there to start with, so if it's better suited for over there let me know and I'll move it. I'm working on a dedicated server set up as a reseller account with Plesk to manage the domains and server configuration, and i need to add a directory to the local open_basedir configuration for a specific vhost. Given Plesk's normal methodology, I expected to be able to go to /var/www/vhost/{%DOMAINNAME%}/conf and modify vhost.conf and place a new value there, as I have successfully done with other configuration settings for this domain (turning safe_mode off, for instance). When I do so, however, the new setting doesn't take (per phpinfo();). If I edit httpd.conf (which the plesk configuration specifically says not to do in the notes at the top of httpd.conf) the setting takes. Is there something specific about the open_basdir setting that makes it not configurable in vhost.conf? How much trouble am I letting myself in for by editing the vhost-specific httpd.conf (I imagine is someone makes changes in the plesk web interface it might be overwritten, but what other risk is there)? Thanks!

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• ImageMagick - how to enforce min/max heights/widths?

  - by Henryh

  Using ImageMagick, how can I resize an image to have a minimum: height of 150px width of 200px and also have a maximum: height of 225px width of 275px UPDATE: In case it helps, here's a further explanation of what I'm experiencing. I have a buch of images with all different ratio dimensions. Some images have 1:5 height/width ratios. Some have 5:1 height/width ratios. So that I want to do is set that a minimum height/width size for the image but also don't want the image size to be larger than a particular size. If I need to apply white padding to an image to make it fit within my constraint so that I don't have to distort the image, I'd like to do so.

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• configure open_basedir under Plesk

  - by cori

  This might be a question for ServerFault, and if it wasn't for the Plesk aspect I would ask it there to start with, so if it's better suited for over there let me know and I'll move it. I'm working on a dedicated server set up as a reseller account with Plesk to manage the domains and server configuration, and I need to add a directory to the local open_basedir configuration for a specific vhost. Given Plesk's normal methodology, I expected to be able to go to /var/www/vhost/{%DOMAINNAME%}/conf and modify vhost.conf and place a new value there, as I have successfully done with other configuration settings for this domain (turning safe_mode off, for instance). When I do so, however, the new setting doesn't take (per phpinfo();). If I edit httpd.conf (which the plesk configuration specifically says not to do in the notes at the top of httpd.conf) the setting takes. Is there something specific about the open_basdir setting that makes it not configurable in vhost.conf? How much trouble am I letting myself in for by editing the vhost-specific httpd.conf (I imagine is someone makes changes in the plesk web interface it might be overwritten, but what other risk is there)? Thanks!

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• Should I use mod_wsgi embedded mode if I have full control of Apache?

  - by mgibsonbr

  I'm managing a bunch of sites and applications in a shared hosting, using Django via mod_wsgi. I had planned to use daemon mode from the beginning (to avoid restart problems), but ended up purchasing a plan that allows me to run a dedicated Apache instance. I kept using daemon mode for convenience, but I'm afraid it's consuming more server resources than it should (I have different projects for each site, each with its own process and process group), so I'm considering switching to embedded mode. Would that be a sensible thing to do? I'd still be able to restart Apache anytime I need to, and I wouldn't need so many child processes and sockets (so I hope the resource usage would decrease). But I'm unsure whether or not doing so would make it more difficult to manage those sites (if I need to update one, I have to restart all) or maybe the applications won't be properly isolated from one another. Are these problems really significant (or only a minor nuisance), are there other drawbacks I coudn't foresee? I'm looking for advice in any aspect of this setup - mainainability, performance, security etc. Tips for improving the current setup are also welcome (I know how to correctly configure a basic mod_wsgi setup, but I'm clueless about sensible values for threads, processes etc).

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• Is it good idea to require to commit only working code?

  - by Astronavigator

  Sometimes I hear people saying something like "All committed code must be working". In some articles people even write descriptions how to create svn or git hooks that compile and test code before commit. In my company we usually create one branch for a feature, and one programmer usually works in this branch. I often (1 per 100, I think and as I think with good reason) do non-compilable commits. It seems to me that requirement of "always compilable/stable" commits conflicts with the idea of frequent commits. A programmer would rather make one commit in a week than test the whole project's stability/compilability ten times a day. For only compilable code I use tags and some selected branches (trunk etc). I see these reasons to commit not fully working or not compilable code: If I develop a new feature, it is hard to make it work writing a few lines of code. If I am editing a feature, it is again sometimes hard to keep code working every time. If I am changing some function's prototype or interface, I would also make hundreds of changes, not mechanical changes, but intellectual. Sometimes one of them could cause me to carry out hundreds of commits (but if I want all commits to be stable I should commit 1 time instead of 100). In all these cases to make stable commits I would make commits containing many-many-many changes and it will be very-very-very hard to find out "What happened in this commit?". Another aspect of this problem is that compiling code gives no guarantee of proper working. So is it good idea to require every commit to be stable/compilable? Does it depends on branching model or CVS? In your company, is it forbidden to make non compilable commits? Is it (and why) a bad idea to use only selected branches (including trunk) and tags for stable versions?

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• Non-graphical linearity estimation

  - by aL3xa

  In my previous post, I was looking for correlation ratio (η or η2) routines in R. I was surprised by the fact that no one uses η for linearity checking in the GLM procedures. Let's start form a simple example: how do you check linearity of bivariate correlation? Solely with scatterplot? There are several ways of doing this, one way is to compare linear and non-linear model R2, then to apply F test to seek for significant difference between them. Finally, the question is: How do you check linearity, the "non-grafical" way?

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• Crystal Reports and WMF image

  - by Eve

  I have a problem with inserting a vector graphics (WMF) into report (Crystal Reports v10.5 from Visual Studio 2008). The image is static, inserted by choosing "Insert Picture" during report design in VS. The problem is that it displays differently (size and aspect ratio) on machines with different operating systems and screen resolutions. Converting to bitmap isn't possible beacause loss of the quality of print isn't acceptable. I thought about dynamic loading of the image, but in this version of CR. I don't see a possibility to set dynamic graphic location in picture properties. Is there any way to solve this problem?

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• Guitar hero clone and music

  - by mm24

  I am an indie game developer and I am doing a game similar to guitar hero. I am using tracks composed by musicians and I contacted them to sing a licensing contract. As is my first indie project I have no idea on how I should deal with the royalties aspect of this because each track as an ISRC code and each time a track is played in public there is a fee to pay to the "local" registration authority. An iPhone game it is downloaded and not played on air (or physically distributed), and hence I think there is a specific legislation for this that specifies how much one should pay. I own some of the tracks composed and for this I think I won't have to pay a royalty (even if the track has an ISRC code) but for other tracks I just have a license "to use". I wonder how a game like Guitar hero can sell on iPhone for as little as 0,99$ and then have "in app purchases" for packs of 3 songs (for about 2 dollars) and make a profit (I imagine they will have to pay a ISRC royalty). Does anyone of you have any idea of this can work or if there is a section in this forum where I can ask this question? I understand is not about coding but I think is about development of a game in the broader sense.

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• Accenture Foundation Platform for Oracle (AFPO)

  - by Lionel Dubreuil

  The Accenture Foundation Platform for Oracle (AFPO) is a pre-built, tested reference application, common services framework and development accelerator for Oracle’s Fusion Middleware 11g product suite that can help to reduce development time and cost by up to 30 percent. AFPO is a unique accelerator that includes documentation, day one deliverables and quick start virtual machine images, along with access to a skilled team of resources, to reduce risk and cost while improving project quality. It can be delivered all at once or in stages, on-site, hosted, or as a cloud solution. Accenture recently released AFPO v5 for use with their clients. Accenture added significant updates in v5 including Day 1 images & documentation for Webcenter & ADF Mobile that are integrated with 30 other Oracle Middleware products that signifigantly reduced the services aspect to standing these products up. AFPO v5 also features rapid configuration and implementation capabilities for SOA/BPM integrated with Oracle WebCenter Portal, Oracle WebCenter Content, Oracle Business Intelligence, Oracle Identity Management and Oracle ADF Mobile.  AFPO v5 also delivers a starter kit for Oracle SOA Suite which builds upon the integration methodology, leading practices and extended tooling contained within the Oracle Foundation Pack. The combination of the AFPO starter kit and Foundation Pack jump-start and streamline Oracle SOA Suite implementation initiatives, helping to reduce the risk of deploying new technologies and making architectural decisions, so clients can ultimately reduce cost, risk and the time needed for an implementation.  You'll find more information at: Accenture's website:  www.accenture.com/afpo YouTube AFPO Telestration:  http://www.youtube.com/watch?v=_x429DcHEJs Press Release Brochure  Contacts: [email protected] Patrick J Sullivan (Accenture – Global Oracle Technology Lead), [email protected]

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• UNESCO, J-ISIS, and the JavaFX 2.2 WebView

  - by Geertjan

  J-ISIS, which is the newly developed Java version of the UNESCO generalized information storage and retrieval system for bibliographic information, continues to be under heavy development and code refactoring in its open source repository. Read more about J-ISIS and its NetBeans Platform basis here. Soon a new version will be available for testing and it would be cool to see the application in action at that time. Currently, it looks as follows, though note that the menu bar is under development and many menus you see there will be replaced or removed soon: About one aspect of the application, the browser, which you can see above, Jean-Claude Dauphin, its project lead, wrote me the following: The DJ-Native Swing JWebBrowser has been a nice solution for getting a Java Web Browser for most popular platforms. But the Java integration has always produced from time to time some strange behavior (like losing the focus on the other components after clicking on the Browser window, overlapping of windows, etc.), most probably because of mixing heavyweight and lightweight components and also because of our incompetency in solving the issues. Thus, recently we changed for the JavaFX 2.2 WebWiew. The integration with Java is fine and we have got rid of all the DJ-Native Swing problems. However, we have lost some features which were given for free with the native browsers such as downloading resources in different formats and opening them in the right application. This is a pretty cool step forward, i.e., the JavaFX integration. It also confirms for me something I've heard other people saying too: the JavaFX WebView component is a perfect low threshold entry point for Swing developers feeling their way into the world of JavaFX.

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• Design pattern for an automated mechanical test bench

  - by JJS

  Background I have a test fixture with a number of communication/data acquisition devices on it that is used as an end of line test for a product. Because of all the various sensors used in the bench and the need to run the test procedure in near real-time, I'm having a hard time structuring the program to be more friendly to modify later on. For example, a National Instruments USB data acquisition device is used to control an analog output (load) and monitor an analog input (current), a digital scale with a serial data interface measures position, an air pressure gauge with a different serial data interface, and the product is interfaced through a proprietary DLL that handles its own serial communication. The hard part The "real-time" aspect of the program is my biggest tripping point. For example, I need to time how long the product needs to go from position 0 to position 10,000 to the tenth of a second. While it's traveling, I need to ramp up an output of the NI DAQ when it reaches position 6,000 and ramp it down when it reaches position 8,000. This sort of control looks easy from browsing NI's LabVIEW docs but I'm stuck with C# for now. All external communication is done by polling which makes for lots of annoying loops. I've slapped together a loose Producer Consumer model where the Producer thread loops through reading the sensors and sets the outputs. The Consumer thread executes functions containing timed loops that poll the Producer for current data and execute movement commands as required. The UI thread polls both threads for updating some gauges indicating current test progress. Unsure where to start Is there a more appropriate pattern for this type of application? Are there any good resources for writing control loops in software (non-LabVIEW) that interface with external sensors and whatnot?

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• Strategy in storing ad-hoc numbers/constants?

  - by Jiho Han

  I have a need to store a number of ad-hoc figures and constants for calculation. These numbers change periodically but they are different type of values. One might be a balance, a money amount, another might be an interest rate, and yet another might be a ratio of some kind. These numbers are then used in a calculation that involve other more structured figures. I'm not certain what the best way to store these in a relational DB is - that's the choice of storage for the app. One way, I've done before, is to create a very generic table that stores the values as text. I might store the data type along with it but the consumer knows what type it is so, in situations I didn't even need to store the data type. This kind of works fine but I am not very fond of the solution. Should I break down each of the numbers into specific categories and create tables that way? For example, create Rates table, and Balances table, etc.?

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