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• How to prevent traffic to/from a slow Cassandra node using Python

  - by Sergio Ayestarán

  Intro: I have a Python application using a Cassandra 1.2.4 cluster with a replication factor of 3, all reads and writes are done with a consistency level of 2. To access the cluster I use the CQL library. The Cassandra cluster is running on rackspace's virtual servers. The problem: From time to time one of the nodes can become slower than usual, in this case I want to be able to detect this situation and prevent making requests to the slow node and if possible to stop using it at all (this should theoretically be possible since the RF is 3 and the CL is 2 for every single request). The questions: What's the best way of detecting the slow node from a Python application? Is there a way to stop using one of the Cassandra nodes from Python in this scenario without human intervention? Thanks in advance!

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• ASP.NET-MVC2 Preview 1: Are There Any Breaking Changes?

  - by Jim G.

  I was following Steven Sanderson's 'Pro ASP.NET MVC Framework' book. On page 132, in accordance with the author's recommendation, I downloaded the ASP.NET MVC Futures assembly, and added it to my MVC project. Then, without encouragement from the author, I downloaded, installed, and incorporated the ASP.NET MVC2 Preview 1 dlls into my project. Now, I can no longer load the website. That is, when I hit F5 in Visual Studio, I get this error. In retrospect, I think it was a really bad idea to assume that ASP.NET MVC2 Preview 1 would only be additive; but I'd like other people to weigh in. Has anyone noticed any breaking changes in ASP.NET MVC 2 Preview 1? Also - Has anyone noticed any changes that impact Castle Windsor? Also, please let me know if I should be mindful of IIS6 vs. IIS7 ramifications.

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• How do I dynamically instantiate a class in javascript?

  - by Adam

  I'm starting out with classes in Javascript and have hit a wall. I've looked all over for a tutorial that goes a little further than simply how to construct a class (usually Animal) then extend the class and have a Method do something (Dog alert('Bark');). I have created a class that I want a user to be able to instantiate (is that the right word)? For example the first stage in my program is for the user to give the class a name, and then start to populate the various variables in the class. When they've done that they may do it again many times. So if: var className = new MyObject(); How do I dynamically create the name of the new object className and then refer to it later in the code?

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• How to set probability for a targetSprite shooting accuracy in shooting game ?

  - by srikanth rongali

  Hi, My code is ion cocos2D. I have written code for generating the bullets from the enemy gun for every 0.3seconds. The enemySprite is in right side of the screen in (land scape mode) at winSize.height/2. the bullet starts from the same point and reach the player's end. I used rand() to generate y-coordinate for the bullet to hit on player side. Now, if the bullet bounded rectangle meets the player bounded rectangle the enemy won. If it misses enemy shoots again after 0.3 seconds. Every thing is fine up to here for me. But I have 10 enemies and each have accuracy of hitting player of probabilities ranging from 0.80 to 1.0. First enemy probability is .80 and 10 enemy's is 1.0. How can I adjust the probability for enemy such that it runs according to its probability. Player also hits the enemy.

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• Launching my deployed my app gets "has stopped working" error. How do I debug this?

  - by Brad Mathews

  I deployed a VB.Net app and ran it and I get 'AppName has stopped working" "Windows is checking for a solution to the problem" along with a Cancel button under Windows 7. Under XP I am only getting the option to Send the error report to Microsoft or not. There is no apparent way to hook into a debugger. I am not getting any exception data. I have put msgboxes at the very start of my code and they are not hit so it is failing before any of my code is even executing. I have checked all dependencies that I can think of. I developed the app on VS2008 Windows 7 and deploying to Windows 7 and WinXP. I need some advice - how do I debug this? Thanks, Brad

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• Debugger does not break when debugging PowerShell console

  - by Adam Driscoll

  I'm developing a binary PowerShell module. I have a post build event that copies that module into the 'modules' directory in my "Documents\WindowsPowerShell" folder. I then have the project set to launch PowerShell.exe. My module is loaded via Import-Module and off I go. The problem is my break points are never hit and the debugger does not break on exceptions. If I run PowerShell outside of Visual Studio and then attach the debugger to the process I can break just fine. The other strange this is that my break points are not empty. Typically if different source versions are loaded they will be. I'm running Visual Studio 2010 on a Win 7 box. My module is currently targeting .NET 3.5. I've tried running both the x64 and x86 versions of PS with no luck.

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• Restart IIS7 webapp for debug in VS2008

  - by spender

  I'm developing an ASP.NET asyc generic handler which uses a static System.Threading.Timer instance to feed data to the response output stream while the context is in the asynchronous phase. I'm having issues at startup that I'd like to debug. Currently, because of the long-lived nature of the timer, I'm manually killing w3wp.exe in order to cause the application to restart. I'm aware that there are other ways to do this, but this is the best workflow I can find! Isn't there a way to force a cold start when I hit f5, instead of the standard VS approach of attaching to the existing IIS process?

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• Profiling statements inside a User-Defined Function

  - by Craig Walker

  I'm trying to use SQL Server Profiler (2005) to track down some application performance problems. One of the calls being made is to a table-valued user-defined function. This function wraps a select that joins several tables together. In SQL Server Profiler, the call to the UDF is logged. However, the select that underlies the UDF isn't being logged at all. Because of this, I'm not getting useful data on which tables & indexes are being hit. I'd like to feed this info into the Database Tuning Advisor for some indexing advice. Is there any way (short of unwrapping the queries themselves) to log the tables called by UDFs in Profiler?

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• Why will IIS 6 not serve my custom 404 page when I set the URL in 'Custom Errors'?

  - by Glenn Slaven

  I've got an ASP.NET MVC site & I've got an Errors controller with a NotFound action which works great for 404 errors that pass though .NET, but for stuff that doesn't (like static files) I've set the Custom Errors value for 404 to URL with a value of /Errors/NotFound. But when I do this & hit a non-existant page the site just gives me this: The system cannot find the path specified. Is this because it's a dynamic url, can IIS not redirect 404 requests to dynamic urls or have I screwed up the config somewhere?

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• Autotesting a network interface

  - by Machado

  Hi All, I'm developing a software component responsible for testing if a network interface has conectivity with the internet. Think of it as the same test the XBOX360 does to inform the user if it's connected with the Live network (just as an example). So far I figured the autotest would run as this: 1) Test the physical network interface (if the cable is conected, has up/downlink, etc...) 2) Test the logical network (has IP address, has DNS, etc...) 3) Connects to the internet (can access google, for example) 4) ??? 5) Profit! (just kidding...) My question relates to step 3: How can I detect, correctly, if my software has connection with the internet ? Is there any fixed IP address to ping ? The problem is that I don't want to rely solely on google.com (or any other well-known address), as those can change in time, and my component will be embbeded on a mobile device, not easy to update. Any suggestions ?

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• Cookie won't unset

  - by Jordan Satok

  OK, I'm stumped, and have been staring at this for hours. I'm setting a cookie at /access/login.php with the following code: setcookie('username', $username, time() + 604800, '/'); When I try to logout, which is located at /access/logout.php (and rewritten to /access/logout), the cookie won't seem to unset. I've tried the following: setcookie('username', false, time()-3600, '/'); setcookie('username', '', time()-3600, '/'); setcookie('username', '', 1, '/'); I've also tried to directly hit /access/logout.php, but it's not working. Nothing shows up in the php logs. Any suggestions? I'm not sure if I'm missing something, or what's going on, but it's been hours of staring at this code and trying to debug.

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• Gravity Sort : Is this possible programatically?

  - by Bragaadeesh

  Hi, I've been thinking recently on using the Object Oriented design in the sorting algorithm. However I was not able to find a proper way to even come closer in making this sorting algorithm that does the sorting in O(n) time. Ok, here is what I've been thinking for a week. I have a set of input data. I will assign a mass to each of the input data (assume input data a type of Mass). I will be placing all my input data in the space all at same distance from earth. And I will make them free fall. According to gravitational law, the heaviest one hits the ground first. And the order in which they hit will give me the sorted data. This is funny in some way, but underneath I feel that this should be possible using the OO that I have learnt till date Is it really possible to make a sorting technique that uses gravitational pull like scenario or am I stupid/crazy?

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• How to implement Android Pull-to-Refresh

  - by yuku

  In Android applications such as Twitter (official app), when you encounter a ListView, you can pull it down (and it will bounce back when released) to refresh the content. I wonder what is the best way, in your opinion, to implement that? Some possibilities I could think of: An item on top of the ListView - however I don't think scrolling back to item position 1 (0-based) with animation on the ListView is an easy task. Another view outside the ListView - but I need to take care of moving the ListView position down when it is pulled, and I'm not sure if we can detect if the drag-touches to the ListView still really scroll the items on the ListView. Any recommendations?

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• Using SqlCacheDependency to get real time updates? - ASP.NET

  - by user102533

  I would like to display real time updates on a web page (based on a status field in a database table that is altered by an external process). Based on my research, there are several ways of doing this. Long Polling (Comet) - This seems to be complex to implement Regular Polling - I can have an AJAX method trigger a database hit every 5seconds to get the current status. But I fear this will have performance issues. Then I read about using SqlCacheDependency - basically the cache gets invalidated based on a field in the table. I am assuming I can use the event trigerred when the cache is invalidated to show the new update to the user? What's an easy solution that will not have performance issues? anyone?

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• Add Web Reference prompts for credentials with "Discovery Credential" dialog but won't accept valid

  - by Eden

  I'm attempting to add a web reference to my ASP.Net 3.0 project. This is a reference to the SQL Server Reporting Services web service. I have verified the service is up and running, but when I try to add the web reference in my project, I am prompted for my credentials, which I enter, and then prompted again and again and again. I have to hit cancel to stop the vicious cycle. When I do that the service definition comes up in the window, but the "Add Reference" button is disabled so I can't add the reference to my project. I have limited knowledge of SQL Reporting Services configurations. If anyone knows how to resolve this problem I'd really appreicate it.

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• Detecting syllables in a word

  - by user50705

  I need to find a fairly efficient way to detect syllables in a word. E.g., invisible - in-vi-sib-le There are some syllabification rules that could be used: V CV VC CVC CCV CCCV CVCC *where V is a vowel and C is a consonant. e.g., pronunciation (5 Pro-nun-ci-a-tion; CV-CVC-CV-V-CVC) I've tried few methods, among which were using regex (which helps only if you want to count syllables) or hard coded rule definition (a brute force approach which proves to be very inefficient) and finally using a finite state automata (which did not result with anything useful). The purpose of my application is to create a dictionary of all syllables in a given language. This dictionary will later be used for spell checking applications (using Bayesian classifiers) and text to speech synthesis. I would appreciate if one could give me tips on an alternate way to solve this problem besides my previous approaches. I work in Java, but any tip in C/C++, C#, Python, Perl... would work for me.

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• Detecting a image 404 in javascript.

  - by xal

  After a user uploads a file we have to do some additional processing with the images such as resizing and upload to S3. This can take up to 10 extra seconds. Obviously we do this in a background. However, we want to show the user the result page immediately and simply show spinners in place until the images arrive in their permanent home on s3. I'm looking for a way to detect that a certain image failed to load correctly (404) in a cross browser way. If that happens, we want to use JS to show a spinner in it's place and reload the image every few seconds until it can be successfully loaded from s3.

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• Tree item edit event listener in flex

  - by Biroka

  I want to catch itemEditEnd in a tree control, but i'm having a little trouble. I call the item editing a bit different: <mx:Tree id="tree" width="100%" height="100%" itemDoubleClick="treeProjects_itemDoubleClickHandler(event)" doubleClickEnabled="true" editable="true" itemEditBeginning="treeProjects_itemEditBeginingHandler(event)" itemEditEnd="treeProjects_itemEditEndHandler(event)" > but: protected function treeProjects_itemEditBeginingHandler(event:ListEvent):void { event.preventDefault(); } i do this, because I want to edit the field just when clicking rename in the context menu. And when I click rename in the context menu, this is what i'm doing (contextParentItem is the event catched on itemRollOver in the tree) : Tree( contextParentItem.target ).editedItemPosition = { columnIndex: 0, rowIndex: contextParentItem.rowIndex }; Thisway I can't catch the itemEditEnd event, but I want to handle some stuff, like: if the new entered value is an empty string, then I don't want to accept the new value if I hit ESC then, the old value should remain.

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• When debugging on WinCE, how can I set Visual Studio to always load symbol files it knows about?

  - by tsellon

  I'm debugging a WinCE, C++ program in Visual Studio across an ActiveSync connection. Every time I start the process it fails to load symbol information. However, if I right click on the module and hit 'Load Symbols' it correctly locates the symbol information without any further prompting from me. Is there a way that I can set Visual Studio to either: (a) automatically load this symbol information, or (b) automatically break the process into the debugger once it's loaded (similar to what windbg does)? I'm guessing there's a setting somewhere, but I've yet to find it. Update: I forgot to mention in the original question that I'm not debugging with the instance of Visual Studio that created the exe.

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• PhysX Question about Raycasting - Setting the shape masks

  - by sweet tv

  I am trying to make the raycast give me the distance of the terrain and nothing else. But I'm not sure how to use the group Mask Filter. virtual NxShape* raycastClosestShape (const NxRay& worldRay, NxShapesType shapeType, NxRaycastHit& hit, NxU32 groups=0xffffffff, NxReal maxDist=NX_MAX_F32, NxU32 hintFlags=0xffffffff, const NxGroupsMask* groupsMask=NULL, NxShape** cache=NULL) const = 0; \param[in] groups Mask used to filter shape objects. Let's say my terrain is set in group 1. How would I use the function above?

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• OpenLayers .containsPoint after pan

  - by Adrian

  I've seem to have hit a bug or i have overlooked something. I written some code that enumerates through all the vector features on a OpenLayers Vector layer - to check if the mouse is inside a vector feature - if so then it displays some info based on the feature. I had to write my own methods to do this because the existing OpenLayers Controls( select etc) stop after finding a feature under the mouse, and i the possibility of several features being stacked on top of one another. My problem is that the .containsPoint method seems to be using coords from before a 'pan'. After zooming in or out the geometry seems to be in the right place and .containsPoint is works correctly when I wave the mouse over the map. Do I need to do something after the map has been panned to update something( feature's geometry)

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• Google bot .net and AspxAutoDetectCookieSupport dilemma

  - by nLL

  Hi, i have a .net mobile web site where i use sesion state and due to nature of mobile networks/phones (not all supports session cookies) i had to use <sessionState cookieless="AutoDetect"/> It works fine but because each new session redirected with "AspxAutoDetectCookieSupport=1" i have a feeling that google won't like this. Here is a small sample from my server logs supportForumReadTopic.aspx id=38 80 - 66.249.71.80 Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html) 302 supportForumReadTopic.aspx id=38&AspxAutoDetectCookieSupport=1 Mozilla/5.0+(compatible;+Googlebot/2.1;++http://www.google.com/bot.html) 200 As you see each new hit from google will get 302 to itself. I have a genericmozilla5.browser file where i define google bot as cookie supporting browser in order to get .net not to use cookieless urls but not sure how this 302 would effect me. Any one had smilar exprience? Any ideas? Suggestions? Thanks

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• Miss a single tap randomly

  - by pion

  I have the following code snippets - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; NSUInteger numberTaps = [touch tapCount]; // Tapping if (numberTaps > 0) { // do something } ... The above code basically detects a single tap on a small image (width = 18 and height = 36). It works 90% of the time detecting a single tap. But it sometime misses it (randomly). I have to tap several times before it picks up the single tap. What did I do wrong or miss so I could consistently detect the single tap 100%? Thanks in advance for your help.

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• Building static nav in concrete5

  - by hollyb

  I've inherited a site built with the CMS concrete5. I'm just starting to dissect it but was hit with a wicked short deadline on a complete overhaul to the nav. So, I want to build out a static nav and then go back when I have more time and integrate it with the auto-nav. Does anybody have experience working with concrete5? If so: Where would I drop my custom static nav? Is it possible to select it from the admin (so that the current one is still available if the client wants to switch back via the admin)? Thanks!

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• jQuery fadeout a div that's revealed by php and not Javascript?

  - by songdogtech

  Seems like this might be easy, but from reading other SO answers there are a number of ways for it to possibly work: I have the "thanks" div below that shows when a php form is sucessfully submitted: <?php if(isset($emailSent) && $emailSent == true) { ?> <div class="thanks"></div> The page does not reload after the form is submitted; the php for the form is included in the page header, the php above is in <body>, and when the form is submitted, the "thanks" div appears. Question: How can the div be faded out (or simply removed) after a few seconds? Document ready doesn't seem like it would work because the page is not reloaded. Can jQuery detect the appearance of the div and then start the fadeout timer? If possible, I'd like to stay with the php form and not move to a jQuery form.

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