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  • What is a user-friendly solution to editing email templates with replacement variables?

    - by Daniel Magliola
    I'm working on a system where we rely a lot of "admins / managers" emailing users from the database. One of the key features is being able to email several people at the same time, with specific information relevant to each of them. Another key feature is to be able to hand-craft emails, because it tends to be be necessary to slightly modify them each time, but having a basic template saves a lot of time. For this, we have the typical "templates" solution, where we have a template that looks kind of like this: Hello {{recipient.full_name}}, Your application to {{activity.title}} has been accepted. You have requested to participate on dates {{application.dates}}, in role {{application.role}} Blah blah blah The problem we are having is obviously that (as we expected), managers don't get the whole "variables" idea, and they do things like overwriting them, which doesn't let them email more than one person at a time, assuming those are not going to get replaced and that the system is broken, or even inexplicable things like "Hello {{John}}". The big problem is that this isn't relegated, as usual, to an "admin" section where only a few power users have access to editing the templates that are automatically send out, and they're expected to know what they are doing. Every user of the system gets exposed to this problem. The obvious solution would be to replace the variables before showing this template for the user to edit, but that doesn't work when emailing several people. This seems like a reasonably common problem, and we are kind of hoping that someone has already solved it. Have you seen anywhere/created/can think of good solutions to this problem?

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  • What calls trigger a new batch?

    - by sebf
    I am finding my project is starting to show performance degradation and I need to optimize it. The answer to my previous question and this presentation from NVidia have helped greatly in understanding the performance characteristics of code using the GPU but there are a couple of things that aren't clear that I need to know to optimize my drawing. Specifically, what calls make the distinction between batches. I know that any state changes cause a new batch, so that includes: Render State Changes Buffer Changes Shader Changes Render Target Changes Correct? What else counts as a 'state change'? Does each Draw**Primitive() call constitute a new batch? Even if I were to issue the same call twice, with no state changes, or call it once on on part of the buffer, then again on another? If I were to update a buffer, but not change the bindings, would that be a new batch? That presentation and a DX9 page suggest using all of the texture slots available, which I take to mean loading multiple objects in 'parallel' by mapping their buffers/shaders/textures to slots 1-16. But I am not sure how this works - surely to do this you would need to change the buffer binding and that would count as a state change? (or is it a case of you do but it saves 16 calls so its OK?)

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  • Website Ethics / legal issues, image copyrights

    - by RailsN00b
    Ignoring the technical implementation of a website for a second, assume a website that is similar to twitter but with pictures. A user say something and puts a picture of whatever they said. As the nature of the internet, the images will most likely not be his/hers image. There are 2 options that I see for dealing with this: 1. The user will post a URL of the picture and the website will pull the picture from that URL everytime someone enters that page 2. The website will save the image in its own database of images and display the image to the visitors 'locally' The problem with option #1, while it saved storage, I see an issue with 'stealing' other websites bandwidth and if my website has many many visitors it could cost the image-hosting websites a lot and possible even crash it if the server can't handle the load. The problem with opion #2, while it saves the load to other websites, it practically takes pictures that could have copyright on them. Which option is better to implement in terms of legal issues and ethics? When do I need to contact another website to request permission to use the images from that site? Does anyone really care about that anymore. Where can I read about this?

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  • Horse Drawn Fiber Optics Bring Broadband to Remote Areas

    - by Jason Fitzpatrick
    When you think of fiber optics and high speed internet the last thing you likely think of is… horses. Yet horses have been put to use rolling out fiber optics to remote rural locations. In Vermont a Belgium draft horse named Fred, seen in the photo above being tended by his handler Claude, is a distinctly 19th century solution to a 21st century problem; how to run fiber optic cable through remote areas where trucks cannot easily pass. The man and animal are indispensable to cable and phone-service provider FairPoint Communications because they easily can access hard-to-reach job sites along country roads, which bulky utility trucks often cannot. “It just saves so much work – it would take probably 15 guys to do what Fred and Claude can do,” said Paul Clancy, foreman of a line crew from FairPoint. “They can pull 5,000 feet of cable with no sweat.” You can read more about the use of draft horses to draw lines and the roll out of broadband to rural Vermont at the link below. Vermont Uses Draft Horse to Lay Cables for Internet Access [Reuters] How To Encrypt Your Cloud-Based Drive with BoxcryptorHTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)

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  • Beginning with shell scripting

    - by Kevin Wyman
    I am fresh into Ubuntu and one of my goals is shell scripting for personal (and maybe public) use. I'm a novice, though I do understand some of the basics (e.g. what a variable, string, loop, etc... is) but to get the most of scripting I need to learn in-depth. I figure the best way to do that is to jump right into scripting and ask questions only pertinent to the stage I am at in my attempted script. Scenario: I have edited my sudoers file to allow my non-root user to run sudo commands without being prompted for a password. Question: In vim, what would be the best code to use for a function that checks whether this condition is [true], If not, prompt the user if they want the script to edit and save the sudoers file to make this condition [true]? Layout - If condition is true, carry-on with rest of script. If condition is not true, the script silently edits/adds the line: %sudo ALL=(ALL:ALL) NOPASSWD: ALL in the sudoers file, saves and then continues on with the next part of the script. Any help with this would be greatly appreciated and assist me in my journey to writing shell scripts.

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  • Another good free utility - Campwood Software Source Monitor

    - by TATWORTH
    The Campwoood Source Monitor at http://www.campwoodsw.com/sourcemonitor.html  says in its introduction "The freeware program SourceMonitor lets you see inside your software source code to find out how much code you have and to identify the relative complexity of your modules. For example, you can use SourceMonitor to identify the code that is most likely to contain defects and thus warrants formal review. SourceMonitor, written in C++, runs through your code at high speed, typically at least 10,000 lines of code per second." It is indeed very high-speed and is useful as it: Collects metrics in a fast, single pass through source files. Measures metrics for source code written in C++, C, C#, VB.NET, Java, Delphi, Visual Basic (VB6) or HTML. Includes method and function level metrics for C++, C, C#, VB.NET, Java, and Delphi. Offers Modified Complexity metric option. Saves metrics in checkpoints for comparison during software development projects. Displays and prints metrics in tables and charts, including Kiviat diagrams. Operates within a standard Windows GUI or inside your scripts using XML command files. Exports metrics to XML or CSV (comma-separated-value) files for further processing with other tools.

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  • Hurry! See the uncensored OOW videos before they get edited!

    - by rickramsey
    source Uploaded so far: Which Oracle Solaris 11 Technologies Have Sysadmins Been Using Most? Director's Cut - Uncensored - Markus Flierl, VP Solaris Core Engineering, describes how Oracle Solaris 11 customers are taking advantage of the Image Packaging System and the snapshot capability of ZFS to run more frequent updates of not only the OS, but also the applications (agile development, anyone?), and how they're using the network virtualization capabilities in Oracle Solaris 11 to isolate applications and manage workloads on the cloud. Watch How Hybrid Columnar Compression Saves Storage Space Director's Cut - Uncensored - Art Licht shows how hyprid columnar compression (HCC) compresses data 30x without slowing down other queries that the database is performing. First he shows what happens when he runs database queries without HCC, then he shows what happens when he runs the queries with HCC. Security Capabilities and Design in Oracle Solaris 11 Director's Cut - Uncensored - Compliance reporting. Extended policy. Immutable zones. Three of the best minds in Oracle Solaris security explain what they are, what customers are doing with them, and how they were engineered. Filmed at Oracle Open World 2012. Why DTrace and Ksplice Have Made Oracle Linux 6 Popular with Sysadmins Use the DTrace scripts you wrote for Oracle Solaris on Oracle Linux without modification. Wim Coekaerts, VP of Engineering for Oracle Linux, explains how this capability of DTrace, the zero downtime updates enabled by KSplice, and other performance and stability enhancements have made Oracle Linux 6 popular with sysadmins. Why Solaris 11 Is Being Adopted Faster Than Solaris 10 Sneak Preview - Uncut Version - Lynn Rohrer, Director of Oracle Solaris Product Management explains why customers are adopting Oracle Solaris 11 at a faster rate than Oracle Solaris 10, and proves why you should never challenge a Montana woman to a test of strength. What Forsythe Corp Is Helping Its Customers Do With Oracle Solaris 11 Director's Cut - Unedited - Lee Diamante, Solutions Architect for Forsythe Corp, an Oracle Solaris Partner, explains why Forsythe has been recommending Oracle Solaris to its customers, and what those customers have been doing with it. Lots more to come ... - Rick Website Newsletter Facebook Twitter

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  • How to make and restore incremental snapshots of hard disk

    - by brunopereira81
    I use Virtual Box a lot for distro / applications testing purposes. One of the features I simply love about it is virtual machines snapshots, its saves a state of a virtual machine and is able to restore it to its former glory if something you did went wrong without any problems and without consuming your all hard disk space. On my live systems I know how to create a 1:1 image of the file system but all the solutions I'v known will create a new image of the complete file system. Are there any programs / file systems that are capable of taking a snapshot of a current file system, save it on another location but instead of making a complete new image it creates incremental backups? To easy describe what I want, it should be as dd images of a file system, but instead of only a full backup it would also create incremental. I am not looking for clonezilla, etc. It should run within the system itself with no (or almost none) intervention from the user, but contain all the data of the file systems. I am also not looking for a duplicity backup your all system excluding some folders script + dd to save your mbr. I can do that myself, looking for extra finesse. I'm looking for something I can do before doing massive changes to a system and then if something when wrong or I burned my hard disk after spilling coffee on it I can just boot from a liveCD and restore a working snapshot to a hard disk. It does not need to be daily, it doesn't even need a schedule. Just run once in a while and let it its job and preferably RAW based not file copy based.

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  • Pushing complete notifications to client

    - by ton.yeung
    So with cqrs, we accept that consistency is eventual. However, that doesn't mean that the user has to continually poll, or that eventual means an update has to take more then 500ms to sync. For the sake of UX, we want to at least give the illusion of consistency, or if not possible, be as transparent as possible. With that in mind, I have this setup: angularjs web client, consumes webapi restful services, sends commands to nservicebus command handlers, saves to neventstore, dispatches events to nservicebus event handlers, sends message to signalr hub, sends notifications to angularjs web client so with that setup, theoretically some initiates a request the server validates the request sends out the necessary commands In the mean time the client gets a 200 response updates the view: working on it gets message sometime later: done, here's the updated data Here's where things get interesting, each command could spawn multiple events. Not sure if this is a serious no, no, or not, but that's how it is currently. For example, a new customer spawns CustomerIDCreated, CustomerNameUpdated, CustomerAddressUpdated, etc... Which event handler needs to notify the client? Should all of them in a progress bar style update?

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  • Is this technique for stat tracking without a database workable?

    - by baptzmoffire
    If I wanted to create a chess game, for iOS, that tracked both player moves (for retracing the progression of a game and for player stats), what would be the simplest route to take? To clarify, I want to track not only the moves a player has made in a particular game, but how often that player has made that move in past games. For example I want to be able to track: How many times a given player has opened by moving the king pawn up two squares (e4) as white, on move number one. What is the percentage of time the player responds to white's e4 opening move, with moving his own king pawn to e5? What percentage of time does he respond by moving his queenside bishop pawn to c5? And so on. If it's not clear, the stat tracking system should also be able to report how many times this player, as black, move his queen to h1, on move number 30. I'm using Parse.com for my back-end as a server (BaaS) service. If I were to create a class that writes strings that identify move number, player color, moved piece, algebraic notation of the square (e.g. "d8") to a file, locally in the file system saves the file to Parse, and deletes the temporary file from file system upon opening the same game in my tableview (a la a "With Friends" game), download this file from Parse, parse through it and retrieve all stats/history, assign all relevant values to variables Is this plan viable, or is there an easier way?

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  • IE8 HTTPs Download Issue

    - by Jon Egerton
    I have a problem with a system I develop related to IE8 downloading over SSL (ie on sites using https://...) and is described on this MS kb article: http://support.microsoft.com/kb/323308 We use the HTTPCacheability.NoCache option as the data being downloaded is sensitive, and is downloaded from a secured site. I don't want that data to be cached on any of the proxies etc that the response passes through back to the client. The article describing the issue details a fix to the client side registry changing a BypassSSLNoCacheCheck setting. I don't want to loosen the system security just for IE8, as the system works fine on anything more upto date. Getting all the clients to apply the hotfix is difficult at best, and impossible at worst. We need to support IE8 in the system, at least for now. So: 1: Does the detailed hotfix have any implications for the security at the browser end in IE8 - does it mean the file will be cached? (in a place other than where the user saves the file). 2: Is there some way I can get these files downloadable with a change at the server end that doesn't break the security side of things?

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  • Why does working processors harder use more electrical power?

    - by GazTheDestroyer
    Back in the mists of time when I started coding, at least as far as I'm aware, processors all used a fixed amount of power. There was no such thing as a processor being "idle". These days there are all sorts of technologies for reducing power usage when the processor is not very busy, mostly by dynamically reducing the clock rate. My question is why does running at a lower clock rate use less power? My mental picture of a processor is of a reference voltage (say 5V) representing a binary 1, and 0V representing 0. Therefore I tend to think of of a constant 5V being applied across the entire chip, with the various logic gates disconnecting this voltage when "off", meaning a constant amount of power is being used. The rate at which these gates are turned on and off seems to have no relation to the power used. I have no doubt this is a hopelessly naive picture, but I am no electrical engineer. Can someone explain what's really going on with frequency scaling, and how it saves power. Are there any other ways that a processor uses more or less power depending on state? eg Does it use more power if more gates are open? How are mobile / low power processors different from their desktop cousins? Are they just simpler (less transistors?), or is there some other fundamental design difference?

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  • Build vs Rebuild

    - by prash
    Build means compile and link only the source files that have changed since the last build, while Rebuild means compile and link all source files regardless of whether they changed or not. Build is the normal thing to do and is faster. Sometimes the versions of project target components can get out of sync and rebuild is necessary to make the build successful. In practice, you never need to Clean. Build or Rebuild Solution builds or rebuilds all projects in the your solution, while Build or Rebuild <project name> builds or rebuilds the StartUp project. To set the StartUp project, right click on the desired project name in the Solution Explorer tab and select Set as StartUp project. The project name now appears in bold. Compile just compiles the source file currently being edited. Useful to quickly check for errors when the rest of your source files are in an incomplete state that would prevent a successful build of the entire project. Ctrl-F7 is the shortcut key for Compile. All source files that have changed are saved when you request a build/rebuild, so you don't have to save them first. When you run your executable (F5 or Ctrl-F5), Visual Studio saves all your changed source files and builds anything that changed, so you don't need to explicitly do those steps every time. This allows for quick "trial and error" debugging. Incidentally, if you like those little Visual Studio keyboard shortcuts, you can download posters of the C# and the VB.Net ones, respectively (I am personally a big fan of using keyboard shortcuts :) ).   Visual Studio 2010 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=92ced922-d505-457a-8c9c-84036160639f   Visual Studio 2005 C#: http://www.microsoft.com/downloads/details.aspx?FamilyID=c15d210d-a926-46a8-a586-31f8a2e576fe&DisplayLang=en VB.NET: http://www.microsoft.com/downloads/details.aspx?FamilyID=6bb41456-9378-4746-b502-b4c5f7182203&DisplayLang=en

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  • How does datomic handle "corrections"?

    - by blueberryfields
    tl;dr Rich Hickey describes datomic as a system which implicitly deals with timestamps associated with data storage from my experience, data is often imperfectly stored in systems, and on many occasions needs to retroactively be corrected (ie, often the question of "was a True on Tuesday at 12:00pm?" will have an incorrect answer stored in the database) This seems like a spot where the abstractions behind datomic might break - do they? If they don't, how does the system handle such corrections? Rich Hickey, in several of his talks, justifies the creation of datomic, and explains its benefits. His work, if I understand correctly, is motivated by core the insight that humans, when speaking about data and facts, implicitly associate some of the related context into their work(a date-time). By pushing the work required to manage the implicit date-time component of context into the database, he's created a system which is both much easier to understand, and much easier to program. This turns out to be relevant to most database programmers in practice - his work saves everyone a lot of time managing complex, hard to produce/debug/fix, time queries. However, especially in large databases, data is often damaged/incorrect (maybe it was not input correctly, maybe it eroded over time, etc...). While most database updates are insertions of new facts, and should indeed be treated that way, a non-trivial subset of the work required to manage time-queries has to do with retroactive updates. I have yet to see any documentation which explains how such corrections, or retroactive updates, are handled by datomic; from my experience, they are a non-trivial (and incredibly difficult to deal with) subset of time-related data manipulation that database programmers are faced with. Does datomic gracefully handle such updates? If so, how?

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  • Can't find new.h - getting gcc-4.2 on Quantal?

    - by Suyo
    I've been trying to compile the Valve Source SDK (2007) on my machine, but I keep running into the same error: In file included from ../public/tier1/interface.h:50:0, from ../utils/serverplugin_sample/serverplugin_empty.cpp:13: ../public/tier0/platform.h:46:17: new.h: No such file or directory I'm pretty new to C++ coding and compiling, but using apt-file search I tried to use every single suggestion for the required files in the Makefile (libstdc++.a and libgcc_eh.a), and none worked. I then found a note in the Makefile saying gcc 4.2.2 is recommended - I assume the older code won't work with the newer version, but gcc-4.2 is unavailable in 12.10. So my question/s is/are: If my assumption is right - how do I get gcc 4.2.2 on Quantal? If my assumption is wrong - what else could be the problem here? Relevant portion of the Makefile: # compiler options (gcc 3.4.1 will work - 4.2.2 recommended) CC=/usr/bin/gcc CPLUS=/usr/bin/g++ CLINK=/usr/bin/gcc CPP_LIB="/usr/lib/gcc/x86_64-w64-mingw32/4.6/libstdc++.a /usr/lib/gcc/x86_64-w64-mingw32/4.6/libgcc_eh.a" # GCC 4.2.2 optimization flags, if you're using anything below, don't use these! OPTFLAGS=-O1 -fomit-frame-pointer -ffast-math -fforce-addr -funroll-loops -fthread-jumps -fcrossjumping -foptimize-sibling-calls -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm -fexpensive-optimizations -frerun-cse-after-loop -fcaller-saves -fpeephole2 -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove -fstrict-overflow -fdelete-null-pointer-checks -freorder-blocks -freorder-functions -falign-functions -falign-jumps -falign-loops -falign-labels -ftree-vrp -ftree-pre -finline-functions -funswitch-loops -fgcse-after-reload #OPTFLAGS= # put any compiler flags you want passed here USER_CFLAGS=-m32

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  • Cron prepending filename to script output

    - by Caitifty
    I'm having an issue with unwanted lines being added to files output by a cron job. I have a script in /etc/cron.hourly which selects some data from a mysql database and saves it in a text file in /var/www. When I run the script as root, it does exactly what I expect it to do. When the script is executed by cron, it creates the same file, but prepends the following three lines at the top of the output file: :::::::::::::: /var/www/outputfilename :::::::::::::: I can't for the life of me work out how to stop this unwanted behavior. The line in /etc/crontab for cron.hourly is the default "44 * * * * root cd / && run-parts --report /etc/cron.hourly". If I use su to change to being root and do "cd / && run-parts --report /etc/cron.hourly" the script runs as expected and the output doesn't have the mysterious additional 3 lines. I've also tried removing the --report flag from the run-parts command in case that was somehow connected, but no joy. Finally, perusing the cron log output in /var/log/syslog just says cron.hourly ran without giving any additional information. Any suggestions on solving this weird problem most welcome..

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  • Packing up files on my machine, sending it to a server, and unpacking it

    - by MxyL
    I am implementing a feature in my application that sends all files in a specified folder to a server. I have the basic FTP transaction set up using Apache Commons FTPClient: it sets up a connection and transfers a file from one place to another. So I can simply loop over the directory and use this connection to transfer all the files. However, this could be better. Rather than transferring each file one by one, it makes more sense to pack it up in a compressed archive and then send the whole file at once. Saves time and bandwidth, since these are just text files so they compress nicely. So I would like to add automatic archive packing and unpacking. This is the workflow I have planned out, using zip compression: Zip all files in the folder Send the file over Unzip the files at its destination 1 and 2 are easy since the files are on the local machine, but I'm not sure how to accomplish the last step, when the files are now on a remote server. What are my options? I have control over what I can put and run on the server. Perhaps it is not necessary to do the packing/unpacking myself?

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  • RESTful applications logic and cross resource operations

    - by Gaz_Edge
    I have an RESTful api that allows my users to receive enquiries about their business e.g. 'I would like to book service x on date y. Is this available?'. The api saves this information as a resource to the following URI users/{userId}/enquiries/{enquiryId} The information shown when this resource is retrieved are the standard sort of things you'd expect from an enquiry - email, first_name, last_name, address, message The api also allows customers to be created for a user. The customer has a login and password and also a profile. The following URIs expose these two resources PUT users/{userId}/customers/{customerId} PUT users/{userId}/customers/{customerId}/profile The problem I am having is that I would like to have the ability to allow users to create a customer from an enquiry. For example, the user is able to offer their service on the date requested and will then want to setup a customer with login details etc to allow them to manage the rest of the process. The obvious answer would be to use a URI like users/{userId}/enquiries/{enquiryId}/convert-to-client The problem with this is is that it somewhat goes against a lot of what I've been reading about how to implement REST (specifically from the book Restful Web Services which suggests that URIs should point to resources not operations on resources). The other option would be to get the client application (i.e. the code that calls the api) to handle some of this application logic. This doesn't quite feel right to me. I have implemented in my design that the client app is fairly dumb. It knows just enough to display the results from the API, and does not contain any application logic. Would be great to hear what others views are on the best way of setting this up Am I wrong to have no application logic in the client app? How would I perform this operation purely in the REST api?

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  • Computer Says No: Mobile Apps Connectivity Messages

    - by ultan o'broin
    Sharing some insight into connectivity messages for mobile applications. Based on some recent ethnography done my myself, and prompted by a real business case, I would recommend a message that: In plain language, briefly and directly tells the user what is wrong and why. Something like: Cannot connect because of a network problem. Affords the user a means to retry connecting (or attempts automatically). Mobile context of use means users use anticipate interruptibility and disruption of task, so they will try again as an effective course of action. Tells the user when connection is re-established, and off they go. Saves any work already done, implicitly. (Bonus points on the ADF critical task setting scale) The following images showing my experience reading ADF-EMG Google Groups notification my (Android ICS) Samsung Galaxy S2 during a loss of WiFi give you a good idea of a suitable kind of messaging user experience for mobile apps in this kind of scenario. Inline connection lost message with Retry button Connection re-established toaster message The UX possible is dependent on device and platform features, sure, so remember to integrate with the device capability (see point 10 of this great article on mobile design by Brent White and Lynn Hnilo-Rampoldi) but taking these considerations into account is far superior to a context-free dumbed down common error message repurposed from the desktop mentality about the connection to the server being lost, so just "Click OK" or "Contact your sysadmin.".

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  • Good sysadmin practise?

    - by Randomthrowaway
    Throwaway account here. Recently our sysadmin sent us the following email (I removed the names): Hi, I had a situation yesterday (not mentioning names) when I had to perform a three way md5 checksum verification over the phone, more than once. If we can stick to the same standards then this will save any confusion if you are ever asked to repeat something over the phone or in the office for clarification. This is of particular importance when trying to speak or say this over the phone … m4f7s29gsd32156ffsdf … that’s really difficult to get right on a bad line. The rule is very simple: 1) Speak in blocks of 4 characters and continue until the end. The recipient can read back or ask for verification on one of the blocks. 2) Use the same language! http://en.wikipedia.org/wiki/Phoenetic_alphabet#NATO Myself, xxx and a few others I know all speak the NATO phonetic alphabet (aka police speak) and this makes it so much easier and saves so much time. If you want to learn quickly then all you really need is A to F and 0 to 9. 0 to 9 is really easy, A to F is only 6 characters to learn. Could you tell me if forcing the developers to learn NATO alphabet is a good practise, or if there are ways (and which ways) to avoid being in such a situation?

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  • Build vs Buy Webcast: November 8, 2012

    - by TammyBednar
    Date: Thursday, November 8, 2012, 1:00 PM EST You have a choice. Do you build your own database platform or buy a pre-engineered database appliance? Building a high-availability database platform presents unique challenges. Combining servers, storage, networking, OS, firmware, and database is complicated and raises important concerns: Will coordination between multiple SME’s delay deployment? Will it be reliable? Will it scale? Will routine maintenance consume precious IT-staff time? Ultimately, will it work? Enter the Oracle Database Appliance, a complete package of software, server, storage, and networking that’s engineered for simplicity. It saves time and money by simplifying deployment, maintenance, and support of database workloads. Plus, it’s based on Intel Xeon processors to ensure a high level of performance and scalability. Attend this Webcast to hear customer stories and discover how the Oracle Database Appliance: Increases ROI by reducing capital and operational expenses Frees IT staff by reducing deployment and management time from weeks to hours Takes the worry out of supporting mission critical application workloads Register For this WebCast today!

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  • Making efficeint voxel engines using "chunks"

    - by Wardy
    Concept I'm currently looking in to how voxel engines work with a view to possibly making one myself. I see a lot of stuff like this ... https://sites.google.com/site/letsmakeavoxelengine/home/chunks ... which talks about how to go about reducing the draw calls. What I can't seem to understand is how it actually saves draw call counts on the basis of the logic being something like this ... Without chunks foreach voxel in myvoxels DrawIfVisible() With Chunks foreach chunk in mychunks DrawIfVisible() which then does ... foreach voxel in myvoxels DrawIfVisible() So surely you saved nothing ?!?! You still make a draw call for each visible voxel do you not? A visible voxel needs a draw call in either scenario. The only real saving I can see is that the logic that evaluates a chunk will be able to determine if a large number of voxels are visible or not effectively saving a bit of "is this chunk visible" cpu time. But it's the draw calls that interest me ... The fewer of those, the faster the application. EDIT: In case it makes any difference I will probably be using XNA (DX not OpenGL) for my engine so don't consider my choice of example in the link above my choice of technology. But this question is such that I doubt it would matter.

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  • Test JPQL with NetBeans IDE 7.3 Tools

    - by Geertjan
    Since I pretty much messed up this part of the "Unlocking Java EE 6 Platform" demo, which I did together with PrimeFaces lead Çagatay Çivici during JavaOne 2012, I feel obliged to blog about it to clarify what should have happened! In my own defense, I only learned about this feature 15 minutes before the session started. In 7.3 Beta, it works for Java SE projects, while for Maven-based web projects, you need a post 7.3 Beta build, which is what I set up for my demo right before it started. Then I saw that the feature was there, without actually trying it out, which resulted in that part of the demo being a bit messy. And thanks to whoever it was in the audience who shouted out how to use it correctly! Screenshots below show everything related to this new feature, available from 7.3 onwards, which means you can try out your JPQL queries right within the IDE, without deploying the application (you only need to build it since the queries are run on the compiled classes): SQL view: Result view for the above: Here, you see the result of a more specific query, i.e., check that a record with a specific name value is present in the database: Also note that there is code completion within the editor part of the dialog above. I.e., as you press Ctrl-Space, you'll see context-sensitive suggestions for filling out the query. All this is pretty cool stuff! Saves time because now there's no need to deploy the app to check the database connection.

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  • Press alt + arrow to skip full line? (Or is there an existing shortcut already..? )

    - by Luka Kotar
    I am still a fresh Ubuntu user, and I switched from a Mac. What I can do on Mac, is I can press alt + arrow to jump one word forward or backward, or if I press cmd + arrow, I am able to jump to the start or end of the line. And that's what I would like to do in Ubuntu. I would assign it to the alt key, as ctrl is already used to skip words. I use that function a lot when coding, I like to keep my hands on the keyboard and just not touch the mouse at all, and it just saves me time for not having to hold the arrow key until I get to the end of the line (or the skip-a-word combo for that matter), or grabbing the mouse to click at the end, just to add a semicolon or something like that. It's not a huge deal, but that's just what I'm used to. I still keep my Mac partition for incompatibility issues, but I prefer Ubuntu over Mac. If there is already a shortcut to do that, I'd gladly go ahead and try getting comfortable using it, but if it is not, how could I achieve what I described above, if of course it is even possible? Thanks in advance, Luka.

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  • Client and Server game update speed

    - by user20686
    I am working on a simple two player networked asteroids game using XNA and the Lidgren networking library. For this set up I have a Lidgren server maintaining what I want to be the true state of the game, and the XNA game is the Lidgren client. The client sends key inputs to the server, and the server process the key inputs against game logic, sending back updates. (This seemed like a better idea then sending local positions to the server.) The client also processes the key inputs on its own, so as to not have any visible lag, and then interpolates between the local position and remote position. Based on what I have been reading this is the correct way to smooth out a networked game. The only thing I don’t get is what value to use as the time deltas. Currently every message the server sends it also sends a delta-time update with it, which is time between the last update. The client then saves this delta time to use for its local position updates, so they can be using roughly the same time deltas to calculate position updates. I know the XNA game update gets called 60 times a second, so I set my server to update the game state at the same speed. This will probably only work as long as the game is working on a fixed time step and will probably cause problems if I want to change that in the future. The server sends updates to clients on another thread, which runs at 10 updates per second to cut down on bandwidth. I do not see noticeable lag in movement and over time if no user input is received the local and remote positions converge on each other as they should. I am also not currently calculating for any latency as I am trying to go one step at a time. So my question is should the XNA client be using its current game time to update the local game state and not being using time deltas sent by the server? If I should be using the clients time delta between updates how do I keep it in-line with how fast the server is updating its game state?

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