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  • Tester/Doer pattern: Assume the caller conforms to the pattern or be defensive and repeat the check?

    - by Daniel Hilgarth
    Assume a simple class that implements the Tester/Doer pattern: public class FooCommandHandler : ICommandHandler { public bool CanHandle(object command) { return command is FooCommand; } public void Handle(object command) { var fooCommand = (FooCommand)command; // Do something with fooCommand } } Now, if someone doesn't conform to the pattern and calls Handle without verifying the command via CanHandle, the code in Handle throws an exception. However, depending on the actual implementation of Handle this can be a whole range of different exceptions. The following implementation would check CanHandle again in Handle and throw a descriptive exception: public void Handle(object command) { if(!CanHandle(command)) throw new TesterDoerPatternUsageViolationException("Please call CanHandle first"); // actual implementation of handling the command. } This has the advantage that the exception is very descriptive. It has the disadvantage that CanHandle is called twice for "good" clients. Is there a consensus on which variation should be used?

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  • How to you solve the problem of implicit locking and parallel execution?

    - by Eonil
    Where the code is: function A() { lock() doSomething() unlock() } We can call A safely from multiple threads, but it never be executed in parallel . For parallel execution, we have to evade all of this code. But the problem is we never know the A is getting lock or not. If we have source code (maybe lucky case), we have to decode all code to know locking is happening or not. This sucks. But even worse is we normally have no source code. It's obvious this kind of hidden locks will become bottleneck of parallel execution even all the other parts are designed for parallel. And also, (1) With locks, execution cannot be parallel. (2) And I can't know whether the locks are used or not in any code. (3) Defensively, I can't make parallel anything! This facts drives me crazy. How do you solve this problem?

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  • Is this fix for Avast Antivirus crashing safe to use?

    - by TmRn
    Well I have installed avast anti virus on Ubuntu 12.04. But after updating, it crashes! So I have made some tweaks like below: Press Ctrl+Alt+T to open the Terminal. When it opens, run the command below. sudo gedit /etc/init.d/rcS Type your password and hit Enter. When the text file opens, add the line: sysctl -w kernel.shmmax=128000000 Make sure the line you added is before: exec /etc/init.d/rc S This is what it should look like: #! /bin/sh # rcS # # Call all S??* scripts in /etc/rcS.d/ in numerical/alphabetical order # sysctl -w kernel.shmmax=128000000 exec /etc/init.d/rc S Save the file. Reboot. My question is: Did I do anything wrong? I mean as I have made some tweaks, will it lower the security of Avast down like viruses do? Please if you are a programmer check this if it contains bug or harmful intentions... Thanks.

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  • Low-traffic WordPress website on Apache keeps crashing server

    - by OC2PS
    I have recently moved my low-moderate traffic (1000 UAUs, 5000 pageviews on a busy day) website from shared hosting to a Centos 6 64-bit VPS with Apache and cPanel running on 4 quad-core processor (likely oversold) and 3GB memory (Xen). We've had problems from the beginning. The server keeps crashing. It seems PHP keeps expanding till it consumes all the memory and crashes the server. Some folks have suggested that I should abandon Apache/cPanel/PHP/mySQL and go with nginX/Varnish/PHP-FPM/SQLite. But that's just not possible for me as I am not very tech savvy and need a simple GUI like cPanel to be able to manage the mundane management tasks (can't afford to hire system administrator or get fully managed hosting). I have come across several posts discussing optimization of Apache for WordPress. But all of these lead to articles that are pretty dated such as this ~4 year old one from Jan 2009 - http://thethemefoundry.com/blog/optimize-apache-wordpress/ The article is pretty detailed and seems helpful, but I stumble even on the first step. My httpd.conf only has 2 loadmodule commands LoadModule fastinclude_module modules/mod_fastinclude.so LoadModule bwlimited_module modules/mod_bwlimited.so So I go total bust right there. Further, my httpd.conf says Direct modifications to the Apache configuration file may be lost upon subsequent regeneration of the configuration file. To have modifications retained, all modifications must be checked into the configuration system by running: /usr/local/cpanel/bin/apache_conf_distiller I am having trouble finding where to change the modules in WHM. Please can someone help me with updated guidelines on how to optimize Apache for WordPress? Many thanks! P.S. The WordPress installation also has WP Super Cache installed. P.P.S. I also have phpBB, OpenCart, and Menalto Gallery installed.

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  • SQL Saturday 300 BBQ Crawl

    - by Bill Graziano
    SQL Saturday #300 is coming up right here in Kansas City on September 13th, 2014.  This is our fifth SQL Saturday which means it's the fifth anniversary of our now infamous BBQ Crawl.  We get together on Friday afternoon before the event and visit a few local joints.  We've done nice places and we've done dives.  We haven’t picked the venues yet but I promise you’ll be well fed! And if you’re thinking about the BBQ crawl you should think about submitting a session.  Our call for speakers closes Tuesday, July 15th so you just have time!  If you’re going to be at the event, contact me and I’ll get you added to the list.

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  • Updating "Inactive" Chunks

    - by Conner Bryan
    In my game, the only chunks (4x4 areas of tiles) in memory are the ones that the player is in. However, chunks need to have updates applied to them over time. A (likely) well-known example would be MineCraft: even if the player isn't in a chunk, the wheat still needs to grow over time. My current solution is to call a method and pass in the time since the chunk was active.. but what if the chunk depends on nearby chunks for information, i.e. vines spreading or similar? Is there any reasonable solutions to this problem, or should I simply not depend on nearby chunks?

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  • Can I automatically make my Nvidia card's fan quieter?

    - by Salim Fadhley
    I have a machine with an Nvidia graphics card. Unfortunately the GPU fan is very loud. It's very annoying at times. We never use this machine for intense 3d work - that GPU is probably not working very hard at all. I'm pretty sure I can run it at a much lower fan-speed without causing any problems. The nvclock utility can be used to manually adjust the fan-speed of my Nvidia graphics card. I'd like to call this utility automatically when the machine boots up. Is there some kind of system service which I can use to automatically apply this kind of system-wide configuration? Even better, is there a system monitoring service which can poll the GPU temperature and adjust the various system fan-speeds accordingly? Thanks!

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  • OutOfBounds Exception when creating a PolygonShape using jbox2d

    - by B3nGr33ni3r
    So here's the deal, i'm parsing a file that contains the vertices for a polygon, that i want to create in box2d. I create a new PolygonShape() and then call .set() giving it a defined array of Vec, and that defined array's .length property. I expected this to work, since the documentation for jbox2d says this method takes a Vec array, and the count of Vec objects in that array. However, it errors out, and it seems to be unrelated to my code. The error i get is Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8 at org.jbox2d.collision.shapes.PolygonShape.set(PolygonShape.java:174) and, upon looking at that line in the jbox2d svn repository, i still cannot figure out the issue. Any help is appreciated!

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  • Google doesn't index a subdomain. What can be the problem and what can be done?

    - by fudge
    I have a domain, let's call it example.com, which has a subdomain, games.example.com. I maintain a games forum using phpbbseo which is located at games.example.com/forum. The problem is that the forum is not being crawled. I used Google's webmaster tools and tested that the page is seen by google. P.S. There is a link from games.example.com to games.example.com/forum. What can I do? How can I make google crawl my forum?

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  • What is the standard for naming variables and why?

    - by P.Brian.Mackey
    I'm going through some training on objective-c. The trainer suggests setting single character parameter names. The .NET developer in me is crying. Is this truly the convention? Why? For example, @interface Square : NSObject { int size; } -(void)setSize: (int)s; I've seen developers using underscores int _size to declar variables (I think people call the variable declared in @interface ivar for some unknown reason). Personally, I prefer to use descriptive names. E.G. @interface Square : NSObject { int Size; } -(void)setSize: (int)size; C, like C# is case sensitive. So why don't we use the same convention as .NET?

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  • How to use GetActiveUniform (in SharpGL)?

    - by frankie
    Generally, guesting is in header. I cannot understand how to use GetActiveUniform function. public void GetActiveUniform(uint program, uint index, int bufSize, int[] length, int[] size, uint[] type, string name); My attempt looks like this (everything is compiled and linked): var uniformSize = new int[1]; var unifromLength = new int[1]; var uniformType = new uint[1]; var uniformName = ""; Gl.GetActiveUniform(Id, index, uniformNameMaxLength[0], unifromLength, uniformSize, uniformType, uniformName); After call I get proper uniformSize, length and type, but not name.

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  • Why is ComboBoxText giving me a "no attribute" error?

    - by boywithaxe
    I'm trying to add a text Combo Box into my app. I've created in and populated the list but when I I try to print out the active text I get an error. Here's the part of the code in question: def on_netif_changed(self, widget): netif = widget.gtk_combo_box_text_get_active_text() print netif And the error I get: Traceback (most recent call last): File "/home/boywithaxe/Developer/Quickly/broadcast/broadcast/BroadcastWindow.py", line 44, in on_netif_changed netif = widget.gtk_combo_box_text_get_active_text() AttributeError: 'ComboBoxText' object has no attribute 'gtk_combo_box_text_get_active_text' I'm a bit at a loss here, I've no problem betting text from text boxes, but this seems a completely different issue. I tried RTFMing but came up short. I would appreciate any suggestions.

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  • How to draw unlimited FPS on Mac OS X with OpenGL?

    - by V1ru8
    I d'like to draw as many frames as possible with OpenGL on Mac OS X to measure the performance on different scenes. What I've tried so far: Using a CVDisplayLink that has NSOpenGLCPSwapInterval set to 0, so it does not sync with the Display. But with that it's still stuck at max 60FPS Using normal -drawRect: with a timer that fires 1/1000sec and calls -setNeedsDisplay: Still not more than 60FPS Same as 2. but I call -display in the timer callback. With that I get the FPS above 60, but it still stops at 100-110 FPS. Although the frame rate should easily be at 10times more. Andy idea how I can really draw as many frames as possible?

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  • Can I (reasonably) refuse to sign an NDA for pro bono work? [closed]

    - by kojiro
    A friend of mine (let's call him Joe) is working on a promising project, and has asked me for help. As a matter of friendship I agreed (orally) not to discuss the details, but now he has a potential investor who wants me to sign a non-disclosure agreement (NDA). Since thus far all my work has been pro bono I told Joe I am not comfortable putting myself under documented legal obligation without some kind of compensation for the risk. (It needn't be strictly financial. I would accept a small ownership stake or possibly even just guaranteed credits in the code and documentation.) Is my request reasonable, or am I just introducing unnecessary complexity?

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  • Can minecraft support an asymmetrical mesh?

    - by Qwaar
    So in a bout of fancy I have decided I want to play as a Zaku II from gundam, and was saddened that player skins must be symmetrical. Then I remembered my friends mod that let him play as a MLP pony, and another one that let you shapeshift into mobs. So I decided I could just butcher a player model mesh and slap on the shoulder spike and shield, slap a Zaku skin I found on it, port the colors over onto more texture for the shoulder portions, and call it a day once I added it to the shiftable list, before butchering a gun mod to turn a gun into a ZMP-78. Before I get started on this though, I need to know if minecraft will support an asymmetrical mesh.

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  • Maven plugin development [closed]

    - by Eugen Martynov
    Pre: I'm new with Maven. I used a lot of ant before. Qst: I decided to switch my project to maven since there are a lot of dependencies. But I have custom step in package phase (I'm BB dev - packing and signing) which is not available in maven yet. To process these tasks I have to download additional execs/jars. Is it common/have sense in Maven philosophy to load additional tools? Sure I could call ant from maven but it's not a question. Any helpful book about maven phases, philosophy and uses?

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  • Scammers on the lose pretending to be Microsoft

    - by John Paul Cook
    Minutes ago I received a phone call that the caller ID listed as “Out of area”, which I knew was a bad sign. It was difficult to understand the caller because of his very thick accent. He told me that he was from Microsoft and that my computer was throwing a large number of errors and he was calling to help me. He directed me to use Windows R to open a run dialog box, type eventvwr and then look at the Event Viewer. Within Event Viewer, he instructed me to open Custom Views and then open Administrative...(read more)

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  • Implementing Command Pattern in Web Application

    - by KingOfHypocrites
    I'm looking to implement the command pattern in a web application (asp.net c#)... Since the commands come in text format from the client, what is the best way to translate the string to a command object? Should I use reflection? Currently I just assume the command that comes in matches the file name of a user control. This is a bit of a hack. Rather than have a select case statement that says if string = "Dashboard" then call Dashboard.Execute(), is there a pattern for working with commands that originate as strings?

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  • State of the (Commerce) Union: What the healthcare.gov hiccups teach us about the commerce customer experience

    - by Katrina Gosek
    Guest Post by Brenna Johnson, Oracle Commerce Product A lot has been said about the healthcare.gov debacle in the last week. Regardless of your feelings about the Affordable Care Act, there’s a hidden issue in this story that most of the American people don’t understand: delivering a great commerce customer experience (CX) is hard. It shouldn’t be, but it is. The reality of the government’s issues getting the healthcare site up and running smooth is something we in the online commerce community know too well.  If there’s one thing the botched launch of the site has taught us, it’s that regardless of the size of your budget or the power of an executive with a high-profile project, some of the biggest initiatives with the most attention (and the most at stake) don’t go as planned. It may even give you a moment of solace – we have the same issues! But why?  Organizations engage too many separate vendors with different technologies, running sections or pieces of a site to get live. When things go wrong, it takes time to identify the problem – and who or what is at the center of it. Unfortunately, this is a brittle way of setting up a site, making it susceptible to breaks, bugs, and scaling issues. But, it’s the reality of running a site with legacy technology constraints in today’s demanding, customer-centric market. This approach also means there’s also a lot of cooks in lots of different kitchens. You’ve got development and IT, the business and the marketing team, an external Systems Integrator to bring it all together, a digital agency or consultant, QA, product experts, 3rd party suppliers, and the list goes on. To complicate things, different business units are held responsible for different pieces of the site and managing different technologies. And again – due to legacy organizational structure and processes, this is all accepted as the normal State of the Union. Digital commerce has been commonplace for 15 years. Yet, getting a site live, maintained and performing requires orchestrating a cast of thousands (or at least, dozens), big dollars, and some finger-crossing. But it shouldn’t. The great thing about the advent of mobile commerce and the continued maturity of online commerce is that it’s forced organizations to think from the outside, in. Consumers – whether they’re shopping for shoes or a new healthcare plan – don’t care about what technology issues or processes you have behind the scenes. They just want it to work.  They want their experience to be easy, fast, and tailored to them and their needs – whatever they are. This doesn’t sound like a tall order to the American consumer – especially since they interact with sites that do work smoothly.  But the reality is that it takes scores of people, teams, check-ins, late nights, testing, and some good luck to get sites to run, and even more so at Black Friday (or October 1st) traffic levels.  The last thing on a customer’s mind is making excuses for why they can’t buy a product – just get it to work. So what is the government doing? My guess is working day and night to get the site performing  - and having to throw big money at the problem. In the meantime they’re sending frustrated online users to the call center, or even a location where a trained “navigator” can help them in-person to complete their selection. Sounds a lot like multichannel commerce (where broken communication between siloed touchpoints will only frustrate the consumer more). One thing we’ve learned is that consumers spend their time and money with brands they know and trust. When sites are easy to use and adapt to their needs, they tend to spend more, come back, and even become long-time loyalists. Achieving this may require moving internal mountains, but there’s too much at stake to ignore the sea change in how organizations are thinking about their customer. If the thought of re-thinking your internal teams, technologies, and processes sounds like a headache, think about the pain associated with losing valuable customers – and dollars. Regardless if you’re in B2B or B2C, it’s guaranteed that your competitors are making CX a priority. Those early to the game who have made CX a priority have already begun to outpace their competition. So as you’re planning for 2014, look to the news this week. Make sure the customer experience is a focus at your organization. Expectations are at record highs. Map your customer’s journey, and think from the outside, in. How easy is it for your customers to do business with you? If they interact with many touchpoints across your organization, are the call center, website, mobile environment, or brick and mortar location in sync? Do you have the technology in place to achieve this? It’s time to give the people what they want!

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  • What is the correct way to reset and load new data into GL_ARRAY_BUFFER?

    - by Geto
    I am using an array buffer for colors data. If I want to load different colors for the current mesh in real time what is the correct way to do it. At the moment I am doing: glBindVertexArray(vao); glBindBuffer(GL_ARRAY_BUFFER, colorBuffer); glBufferData(GL_ARRAY_BUFFER, SIZE, colorsData, GL_STATIC_DRAW); glEnableVertexAttribArray(shader->attrib("color")); glVertexAttribPointer(shader->attrib("color"), 3, GL_FLOAT, GL_TRUE, 0, NULL); glBindBuffer(GL_ARRAY_BUFFER, 0); It works, but I am not sure if this is good and efficient way to do it. What happens to the previous data ? Does it write on top of it ? Do I need to call : glDeleteBuffers(1, colorBuffer); glGenBuffers(1, colorBuffer); before transfering the new data into the buffer ?

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  • Include in service layer all the application's functions or only the reusable ones?

    - by BornToCode
    Background: I need to build a main application with some operations (CRUD and more) (-in winforms), I need to make another application which will re-use some of the functions of the main application (-in webforms). I understood that using service layer is the best approach here. If I understood correctly the service should be calling the function on the BL layer (correct me if I'm wrong) The dilemma: In my main winform UI - should I call the functions from the BL, or from the service? (please explain why) Should I create a service for every single function on the BL even if I need some of the functions only in one UI? for example - should I create services for all the CRUD operations, even though I need to re-use only update operation in the webform? YOUR HELP IS MUCH APPRECIATED

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  • GPL question : web application using Imagick and GhostScript => Which would be the final licence?

    - by sdespont
    I am a bit confusing and I need your help to undertand my problem. I have developed a web application (PHP, JQuery) for one of my customer. Recently, my customer ask me to add a new feature permitting PDF to JPG conversion. After web browsing, I have discovered that iMagick (Apache licence) PHP extension with GhostScript (GPL licence) is the only solution. But, as my customer want to sell the web application to others companies, I have to use non-GPL licences. By the way, this feature is OPTIONAL and the final user must download and install manually iMagick and GhostScript if he his interesting by using the PDF conversion. Is there someone to tell me if the fact to use Imagick to convert PDF to JPG (and therefore use GhostScript) turns my current proprietary licence to GPL? And what about if I don't use Imagick but call GhostScript using PHP exec() function? Is there others non-GPL projects to convert PDF to JPG that I could use with PHP? Any help would be greatly appreciated.

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  • $ON_USER returning root instead of $USER

    - by Nathanel Titane
    Hello everybody! With Natty coming out soon, I've been at work updating my deployment and self-config script to make my desktop on 11.04 run and look the way I want it to. One bummer is that dbus seems to have changed and does not permit, in the same manner Lucid and Maverick did, the authentication of the current user by terminal call using grep and cat. Ideally, to run the script, I would sudo -s and then launch it as # chmod +x install && ./install Instead of returning my user name.. it now returns root and applies changes to the root profile and aborts whenever paths do not correspond. Here is my script header: #!/bin/bash ON_USER=$(echo ~ | awk -F'/' '{ print $1 $2 $3 }' | sed 's/home//g') export $(grep -v "^#" ~/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0) if sudo -u $ON_USER test -z "$DBUS_SESSION_BUS_ADDRESS" ; then eval `sudo -u $ON_USER dbus-launch --sh-syntax --exit-with-session` fi RELEASE=$(lsb_release -cs) How could I make it return the actual user now that natty is coming? Thanks for the help

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  • How to work around the home directory changing to /root when using sudo?

    - by Nathanel Titane
    Hello everybody! With Natty coming out soon, I've been at work updating my deployment and self-config script to make my desktop on 11.04 run and look the way I want it to. One bummer is that dbus seems to have changed and does not permit, in the same manner Lucid and Maverick did, the authentication of the current user by terminal call using grep and cat. Ideally, to run the script, I would sudo -s and then launch it as # chmod +x install && ./install Instead of returning my user name.. it now returns root and applies changes to the root profile and aborts whenever paths do not correspond. Here is my script header: #!/bin/bash ON_USER=$(echo ~ | awk -F'/' '{ print $1 $2 $3 }' | sed 's/home//g') export $(grep -v "^#" ~/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0) if sudo -u $ON_USER test -z "$DBUS_SESSION_BUS_ADDRESS" ; then eval `sudo -u $ON_USER dbus-launch --sh-syntax --exit-with-session` fi RELEASE=$(lsb_release -cs) How could I make it return the actual user now that natty is coming? Thanks for the help

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  • gnome shell with very high CPU usage

    - by 501 - not implemented
    i'm running ubuntu gnome 13.10 on my dell latiude e6510 with a i5 m560. The I5 comes with a embedded Intel HD 3400 Graphics. The average cpu usage of the gnome-shell is by 160% it's to high, I think. Is there a problem with a driver? If i call the command glxinfo | grep OpenGL it returns: OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.3, 128 bits) OpenGL version string: 2.1 Mesa 9.2.1 OpenGL shading language version string: 1.30 OpenGL extensions: Greetings

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