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• Is OO design's strength in semantics or encapsulation?

  - by Phil H

  Object-oriented design (OOD) combines data and its methods. This, as far as I can see, achieves two great things: it provides encapsulation (so I don't care what data there is, only how I get values I want) and semantics (it relates the data together with names, and its methods consistently use the data as originally intended). So where does OOD's strength lie? In constrast, functional programming attributes the richness to the verbs rather than the nouns, and so both encapsulation and semantics are provided by the methods rather than the data structures. I work with a system that is on the functional end of the spectrum, and continually long for the semantics and encapsulation of OO. But I can see that OO's encapsulation can be a barrier to flexible extension of an object. So at the moment, I can see the semantics as a greater strength. Or is encapsulation the key to all worthwhile code?

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• Android MediaPlayer crashing app

  - by user1555863

  I have an android app with a button that plays a sound. the code for playing the sound: if (mp != null) { mp.release(); } mp = MediaPlayer.create(this, R.raw.match); mp.start(); mp is a field in the activity: public class Game extends Activity implements OnClickListener { /** Called when the activity is first created. */ //variables: MediaPlayer mp; //... The app runs ok, but after clicking the button about 200 times on the emulator, app crashed and gave me this error https://dl.dropbox.com/u/5488790/error.txt (couldn't figure how to post it here so it will appear decently) i am assuming this is because the MediaPlayer object is consuming up too much memory, but isn't mp.release() supposed to take care of this? What am i doing wrong here?

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• Entity Framework - avoiding another query

  - by adamjellyit

  I have a requirement to only save data to a table in a database (I don't need to read it) If the record already exists I want to update it otherwise I will add it. It usually exists. My entity context might already hold the object .. if it does I want to find it and use it again without causing it to refresh from the database when I 'find' it i.e. The context holds a collection of entities (rows of a database) I want to find an entity in the collection and only want the context to go to the database if entity is not in the collection. I don't care about the current values of the entity .. I just want to update them. Hope this is clear ..... thanks

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• Memory leak with preg_replace

  - by Silvio Donnini

  I'm using the preg_replace function to replace accents in a string, I'm working with UTF-8. I have incurred in what seems to be a memory leak, but I can't isolate the root cause, my code is rather simple: preg_replace( array_keys($aToNoAccents), array_values($aToNoAccents), $sText ); where $aToNoAccents is an associative array with entries like '~[A]~u' => 'A', '~[C]~u' => 'C',. My script prints this error for the above line: Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 3039 bytes) Obviously it's not a matter of increasing the allowed memory for PHP, (a 1Gb footprint is way off the scale of my application). Also, that line is executed thousands of times without problems but, just for some cases which are difficult to reproduce, it yields the error. Is anyone aware of memory problems with preg_replace and UTF-8 strings? Am I to use special care in passing actual parameters to such function? I'm using PHP 5.2.6-3 with Suhosin-Patch thanks Silvio

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• SQL Query in Ruby: Only select the changes

  - by JJ Liu

  Suppose I have a table (PriceHistory) like this, every time I change anything in the row, I will record the whole row again in the table. id | buy_price | sell_price | change_date 1 | 2 | 2 | 2012-06-22 2 | 3 | 2 | 2012-06-20 3 | 2 | 6 | 2012-06-15 4 | 5 | 5 | 2012-06-15 5 | 5 | 7 | 2012-06-15 6 | 4 | 8 | 2012-06-12 I only care about the change of BuyPrice, Is there a way to just select row 1, 2, 3, & 5? Here is the Ruby code I come up with, but it does not only select the changed rows PriceHistory.select("id, BuyPrice, change_date"). order("change_date DESC") Both Ruby and SQL answers are fine.

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• how to consume .net webservices

  - by Rajesh Rolen- DotNet Developer

  please tell that can we consume .net web services in php or not. if yes then please tell me how can we do it. i am to create a web service which takes values and save it in database also it will take values and reply some data as a standard xml format. i know how to create web service and how to use it in asp.net but don't know how to use/call it from php. thing is that i will not be writing code in php to consume but wants to know that do i need to take care of any special thing or need to do some extra code to make it available and use by php developers. i am to create web service in .net framework 2.0 Thanks

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• Execute an autocommand only once

  - by Andrej M.

  I have an issue with using GVim on Windows. I have set up the following in my .vimrc: if has("gui_running") autocmd VIMEnter * :source C:/session.vim endif Unfortunately this creates a problem. If I'm a the top of the file and try to move up a line (k), the screen flashes. If I hold the key for just a second it will flash a few dozen times, it is really nasty too look at. I've tried using GUIEnter instead but I got the same results. The docs mention that I can fire an autocommand only once, but I couldn't figure out the exact syntax. Care to help?

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• Compiling .NET component that uses a non specific required version of a 3rd Party Vendor component

  - by Dan

  If someone were to develop a .NET component that relied on non specific versions of a vendor DLL - let's say it worked with My3rdPartyComponent.dll which is a .NET assembly, but it didn't matter which version. Some instances of classes found in this component would need to be passed into my component. Developers would reference my component dll but not have access to the source code. Basically, I want to be able to require the user to pass in an instance of 3rdPartyComponent.MyClass to my component functions but I do not care if it's version 1.1, 2.2, 2.23.980, etc of the 3rd party dll. Is there a way to do this while still typing the parameter I want to be passed in to my component? I don't want to use Object as the reference. In my component project I could specify SpecificVersion=True on the assembly reference. Will this solve my problem or will there be other 'dll hell' issues to deal with that I am not seeing?

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• VB.net 'cross-referencing' tables.

  - by Lee

  Hello, I have a DataGridView that is being filled with data from a table. Inside this table is a column called 'group' that has the ID of an individual group in another table. What I would like to do, is when the DataGridView is filled, instead of showing the ID contained in 'group', I'd like it to display the name of the group. Is there some type of VB.net 'magic' that can do this, or do I need to cross-reference the data myself? Here is a breakdown of what the 2 tables look like: table1 id group (this holds the value of column id in table 2) weight last_update table2 id description (this is what I would like to be displayed in the DGV.) take care, lee BTW - I am using Visual Studios Express.

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• Windows Azure worker roles: One big job or many small jobs?

  - by Ryan Elkins

  Is there any inherent advantage when using multiple workers to process pieces of procedural code versus processing the entire load? In other words, if my workflow looks like this: Get work from queue0 and do A Store result from A in queue1 Get result from queue 1 and do B Store result from B in queue2 Get result from queue2 and do C Is there an inherent advantage to using 3 workers who each do the entire process themselves versus 3 workers that each do a part of the work (Worker 1 does 1 & 2, worker 2 does 3 & 4, worker 3 does 5). If we only care about working being done (finished with step 5) it would seem that it scales the same way (once you're using at least 3 workers). Maybe the big job is better because workers with that setup have less bottleneck issues?

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• How to actually use ZeroClipboard in jQuery?

  - by Martti Laine

  Hello I just can't get this thing. How is ZeroClipboard supposed to work? Why does it need to move the flash-element over the copied text? I've read this thing: http://code.google.com/p/zeroclipboard/wiki/Instructions Can someone provide me a short snippet, which makes it possible to copy a text in variable to users clipboard, when user clicks a link. Is this even possible? I don't care, if it doesn't work on all browsers (IE6 for example). I'm using jQuery. Martti Laine

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• Creating a Box Control over an area of the map with OpenLayers

  - by Bernie Perez

  I am using OpenLayers to create a box of interest with my program. I am using this code: var control = new OpenLayers.Control(); OpenLayers.Util.extend(control, { draw: function () { this.box = new OpenLayers.Handler.Box( control, {"done": this.notice}, {keyMask: OpenLayers.Handler.MOD_SHIFT}); this.box.activate(); }, notice: function (bounds) { areaSelected(bounds); } }); map.addControl(control); to capture the "Shift Create a Box" control and use the area selected as my area of interest. However the values come back as pixels. But I want Longitude and Latitude, not pixels. The Mouse Position control does show the correct long & lat. I really don't care how to box is created, I just want an easy way for the user to select a area of the map and I need to get the lat & longs of the area. (Box, Circle, doesn't matter)

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• Variable height header with scrollable content area filling remaining viewport area

  - by Neutrino

  I've seen versions of this simple problem raised a dozen times here and elsewhere on the web, but I haven't seen a solution that works for me yet so I'm asking it again. I want a webpage with a variable height full width header (height based on contents). Below that I want a content area that fills the rest of the browser viewport. If the content is larger than the remaining space in the viewport then I want the content area to scroll. I don't need this to work on IE6. I don't care whether the solution uses CSS, tables or a mixture of the two, just no frames and no Javascript. For a bonus point fix a variable height footer to the bottom of the page.

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• Java/Swing: the fast/slow UI binding problem

  - by Jason S

  I need a way to bind UI indicators to rapidly-changing values. I have a class NumberCruncher which does a bunch of heavy processing in a critical non-UI thread, thousands of iterations of a loop per second, and some number of those result in changes to a set of parameters I care about. (think of them as a key-value store) I want to display those at a slower rate in the UI thread; 10-20Hz would be fine. How can I add MVC-style notification so that my NumberCruncher code doesn't need to know about the UI code/binding?

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• SQL Server 2008 Table Maintenance - Rebuild, Reorganize, Update Stats, Check Integrity etc HELP!

  - by Albert

  I'm migrating a ~15GB database from SQL Server 2005 to a new server running SQL Server 2008, and along with that I need to create all the new Maintenance Plans. I can take care of all the backup stuff, but the table maintenance baffles me some. Does anyone have any input on how often I should (or how often you do would suffice too) the following tasks? Check Database Integrity Rebuild Indexes Reorganize Indexes Update Statistics Shrink Database? Am I missing anything? Again if you can share how often you do these tasks that would be great...and/or share any general information about your approach to table maintenance that would be helpful. Lastly does it matter what order I run these tasks in (when setting up a job)?

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• How do I manipulate the scroll bars so that a div with content that changes size is showing the same

  - by Shaun

  What I have is a div, for example is 800*800 px, and inside of this div is a SVG image, which can fit in the div but also can get very large, say 5000*5000 px, and I need to manipulate the scrollbars so that when the SVG has changed size the scrollbars adjust so that you are seeing the same center of your 'viewport' that you were seeing before. The reason I use 'viewport' is because I have seen exactly what I am trying to achieve done in WPF. Initially it sets the center as the center of the SVG so that when the SVG gets larger then the container the scrollbars automatically scroll to show the center of the SVG. If the user scrolls the 'viewports' center is updated and any changes in size now center there. I need this to be cross-browser compliant and done only with javascript. However I really don't care what container the SVG is being bounded by.

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• What is a good motivating example for dataflow concurrency?

  - by Alex Miller

  I understand the basics of dataflow programming and have encountered it a bit in Clojure APIs, talks from Jonas Boner, GPars in Groovy, etc. I know it's prevalent in languages like Io (although I have not studied Io). What I am missing is a compelling reason to care about dataflow as a paradigm when building a concurrent program. Why would I use a dataflow model instead of a mutable state+threads+locks model (common in Java, C++, etc) or an actor model (common in Erlang or Scala) or something else? In particular, while I know of library support in the languages above (and Scala and Ruby), I don't know of a single program or library that is a poster child user of this model. Who is using it? Why do they find it better than the other models I mentioned?

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• Is it possible to implement a GC.GetAliveInstancesOf<T>() (for use in debugging)?

  - by Omer Raviv

  Hi, I know this was answered before, but I'd like to pose a somewhat different question. Is there any conceivable way to implement GC.GetAliveInstancesOf(), that can be evaluated in Visual Studio Debug Watch window? Sasha Goldstein shows one solution in this article, but it requires every class you want to query inherit from a specific base class. I'll emphasize that I only want to use this method during debugging, so I don't care that the GC may change an object's address in memory during runtime. One idea might be to somehow harness the !dumpheap –type command of SOS, and do some magic trick to create a temporary variable and have it point out to the memory address printed by SOS. Does anyone have a solution that works?

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• Configuration manager for PHP

  - by Jack

  I am working on code re-factoring of configuration file loading part in PHP. Earlier I was using multiple 'ini' files but now I plan to go for single XML file which will be containing all configuration details of the project. Problem is, if somebody wants configuration file in ini or DB or anything else and not the default one (in this case XML), my code should handle that part. If somebody wants to go for other configuration option like ini, he will have to create ini file similar to my XML configuration file and my configuration manager should take care everything like parsing, storing in cache. For that I need a mechanism lets say proper interface for my configuration data where the underlying data store can be anything( XML, DB, ini etc) also I don't want it to be dependent on these underlying store and anytime in future this should be extensible to other file formats.

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• How do I write to a file and print to a terminal cuncurrently in Unix?

  - by bias

  I have a little bash function to log my Macports outputs to a file (since installs often spew little tidbits that are easy to lose in terminal noise), then I just cat the file to the terminal: function porti { command sudo port install $@ >> $1.log 2>&1; cat $1.log } Is there a way to do this concurrently? I don't care about it being in Bash, that's just how I started it. BTW I pass $@ to install but only $1 for the file name so that I can do something like: porti git-gore +bash_completion and only get the file git-core.log however someone else might prefer to include variants in the file name ...

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• XMLHttpRequest error in IE, works without issue in Chrome/FF

  - by culov

  function addRequest(req) { try { request = new XMLHttpRequest(); } catch (e) { try{ request = new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ try { request = new ActiveXObject("Microsoft.XMLHttp"); } catch (e) { alert("XMLHttpRequest error: " + e); } } } request.open("GET", req, true); request.send(null); return request; } As you can see, it IE apparently fails all 3 ways in which I try to make the request. I've been doing plenty of searches to try and find what may be the issue, but by all accounts ive read, the code ive posted above should work. i havent used jquery for AJAX, but ive seen it recommended when others have had issues with httprequest objects. could i just replace the mess above with a couple lines of jquery and assume that it will take care of IE's ugliness? Thanks!

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• Changing text size on a ggplot bump plot

  - by Tom Liptrot

  Hi, I'm fairly new to ggplot. I have made a bumpplot using code posted below. I got the code from someones blog - i've lost the link.... I want to be able to increase the size of the lables (here letters which care very small on the left and right of the plot) without affecting the width of the lines (this will only really make sense after you have run the code) I have tried changing the size paramater but that always alter the line width as well. Any suggestion appreciated. Tom require(ggplot2) df<-matrix(rnorm(520), 5, 10) #makes a random example colnames(df) <- letters[1:10] Price.Rank<-t(apply(df, 1, rank)) dfm<-melt(Price.Rank) names(dfm)<-c( "Date","Brand", "value") p <- ggplot(dfm, aes(factor(Date), value, group = Brand, colour = Brand, label = Brand)) p1 <- p + geom_line(aes(size=2.2, alpha=0.7)) + geom_text(data = subset(dfm, Date == 1), aes(x = Date , size =2.2, hjust = 1, vjust=0)) + geom_text(data = subset(dfm, Date == 5), aes(x = Date , size =2.2, hjust = 0, vjust=0))+ theme_bw() + opts(legend.position = "none", panel.border = theme_blank()) p1 + theme_bw() + opts(legend.position = "none", panel.border = theme_blank())

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• How should I deploy a patch to a Passenger-based production Rails application without downtime?

  - by Olly

  I have a Passenger-based production Rails application which has thousands of users. Occasionally we need to apply a code patch (we use git) and the current process for doing this (you can assume there are no data migrations) is: Perform git pull origin [production-branch-name] on the server touch tmp/restart.txt to restart Passenger This allows us to patch the server without having to resort to putting up a maintenance page, which is great, but it doesn't feel quite right since it's not actually a proper 'deployment', and we still need to manually update the revision file and our deployment doesn't appear in the Hoptoad or NewRelic services we use. Ideally I would run cap production deploy and just let the standard Capistrano deployment script take care of everything, but is this a dangerous thing to do without putting up a maintenance page? This deployment process seems to be fairly safe in that the new revision is deployed to a completely separate folder and only right at the end of the process is a symlink re-created to switch the currently deployed version, but I'm still fairly paranoid about this somehow resulting in a lost or failed request.

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• .Net Regular expression - how to do an exact match exclusion on a full string?

  - by Nathan Ridley

  I need a .Net regular expression that matches anything OTHER than the exact full string match specified. So basically: ^Index$ ... is the only exclusion I care about. Strings can start with, finish with or contain "Index", but not match exactly. My brain doesn't seem to be working today and I'm failing to work this one out. EDIT The answer MUST be via the pattern itself, as I am passing an argument to a third party library and do not have control over the process other than via the Regex pattern.

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• Send Redirects To Specific Ports

  - by Garrett

  I have an Rails application server that is listening on port 9000, and is being called through haproxy. All my redirects from that server are being redirected back through port 9000, when they should be sent back on port 80. I am using a combination of haproxy + nginx + passenger. Is there a way to make sure all redirects are being sent through port 80, regardless of what port the actual server is listening on? I don't care if its a haproxy, nginx, Passenger, or Rails change. I just need to make sure most requests unless specified otherwise, are sent back to port 80. Thanks!

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