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• Handling database failover for Rails applications on FreeBSD

  - by bianster

  I'm working on implementing database (Postgresql) failover for a Rails app that runs with Passenger/FreeBSD. Due to certain constraints regarding the server OS, it's necessary to continue using FreeBSD (as opposed to say, Ubuntu). I'm finding it to be quite a challenge to have failover handled within the Rails application, by way of a customised database adapter due to the fact that this application will be load-balanced between several webservers, and the multiple Rails processes that Passenger spawned in each webserver. I previously looked at setting up Pacemaker/Corosync to manage database server failover on a common IP but unfortunately I wasn't able to get past building the packages on FreeBSD. It does work rather well on Ubuntu 10.04 but I'm not likely to be able to use Ubuntu due to the OS constraints. I'm considering a custom witness daemon that simply pings the primary DB server, and this witness daemon switches all the webservers to the standby DB server when the primary becomes uncontactable (permanently/temporarily), to avoid split-brain. Though I would really like to know if there is a way to get Pacemaker(or something similar) to do the switch on FreeBSD.

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• Diff Algorithm

  - by Daniel Magliola

  I've been looking like crazy for an explanation of a diff algorithm that works and is efficient. The closest I got is this link to RFC 3284 (from several Eric Sink blog posts), which describes in perfectly understandable terms the data format in which the diff results are stored. However, it has no mention whatsoever as to how a program would reach these results while doing a diff. I'm trying to research this out of personal curiosity, because I'm sure there must be tradeoffs when implementing a diff algorithm, which are pretty clear sometimes when you look at diffs and wonder "why did the diff program chose this as a change instead of that?"... Does anyone know where I can find a description of an efficient algorithm that'd end up outputting VCDIFF? By the way, if you happen to find a description of the actual algorithm used by SourceGear's DiffMerge, that'd be even better. NOTE: longest common subsequence doesn't seem to be the algorithm used by VCDIFF, it looks like they're doing something smarter, given the data format they use. Thanks!

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• Question about Jboss deployment

  - by Manoj

  Hi All, I am new to Jboss and deployment of web applications etc. I have two different war files deployed on the same Jboss server. Further they also share some classes which read different properties based on the application settings (Let's call a common class as CommonClass.class which is present in App1.war and App2.war; CommonClass has a member "FIELD1", so both these war files have CommonClass.class each of which reads different properties, into CommonClass.FIELD1). But during run-time when I access FIELD1 in one application (App2.war-CommonClass.FIELD1) it has the value from another application (App1.war-CommonClass.FIELD1). Is there any way I can explicitly specify so that JBoss treats these classes and fields to be different? so that both these classes can exist in memory yet hold their respective correct values? Thanks a ton, Manoj

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• Complex String Processing - well complex to me

  - by percent20

  I am calling a web service and all I get back is a giant blob of text. I am left to process it myself. Problem is not all lines are necessarily the same. They each have 2 or 3 sections to them and they are similar. Here are the most common examples text1 [text2] /text3/ text1/test3 text1[text2]/text3 text1 [text2] /text /3 here/ I am not exactly sure how to approach this problem. I am not too good at doing anything advanced as far as manipulating strings. I was thinking using a regular expression might work, but not too sure on that either. If I can get each of these 3 sections broken up it is easier from there to do the rest. its just there doesn't seem to be any uniformity to the main 3 sections that I know how to work with.

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• Best Practise to populate Fact and Dimension Tables from Transactional Flat DB

  - by alex25

  Hi! I want to populate a star schema / cube in SSIS / SSAS. I prepared all my dimension tables and my fact table, primary keys etc. The source is a 'flat' (item level) table and my problem is now how to split it up and get it from one into the respective tables. I did a fair bit of googling but couldn't find a satisfying solution to the problem. One would imagine that this is a rather common problem/situation in BI development?! Thanks, alexl

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• Young people using Emacs?

  - by bigmonachus

  I am a college student that has fallen in love with Emacs. I have used IDEs in the past, and although features like Intellisense made the switch to Emacs very hard, I now think that Emacs is much more powerful, and features like Intellisense can be pretty closely matched by various modes depending on language (and I am not referring to M-/). I am happily writing Elisp code for everything that I need that isn't provided by modes or by Emacs itself and I love the way that it adapts and molds to my needs. However, I do think that its main disadvantage is the fact that it has a pretty steep learning curve and that most new programmers will not even begin to learn it out of many common misconceptions. So, I want to know the opinions of young people (or any person who didn't start using Emacs before there were IDEs) that are Emacs users. Just to get some reassurance that Emacs is not dead within our Eclipse-loving generation =). (Opinions of users of any other highly extensible editor like Jedit are also welcome)

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• Pulling and pushing between two google code repositories

  - by Kim L

  I'll start by quoting google's blog Project owners can now create multiple repositories for their project, and they can choose to make any of those new repositories a clone of any of the project's other repositories. These project clones share the same commit access permissions as the original project and make it easier for project members to work together on new features. A common pattern in the Mercurial world is to place each "official" branch into a separate repository with naming conventions like "project-crew", "project-stable", and so on. I've done exactly this. I have my default repository and then I've cloned that repository to a repo named "dev". I intend to use the default repository as my stable repo and then the dev repo as my primary development repo. Now I'm just wondering how on earth I should go about to pull and push between the default and the dev repositories?

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• free geolocation geoip, are they viable?

  - by brett

  I'm trying to get a visitor's location based on their IP, pretty common stuff. My research so far shows that there's a database from MaxMind that costs $370 + $90/month... not the type of cost I can afford. Then there's a free version called GeoLite City. Anyone used these before? Drop a quick line here please. Why is one free and the answer so expensive. Is the free one usable, is it not as accurate, what's the catch? P.S. Any other suggestions are welcome.

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• How to debug packet loss ?

  - by Gene Vincent

  I wrote a C++ application (running on Linux) that serves an RTP stream of about 400 kbps. To most destinations this works fine, but some destinations expericence packet loss. The problematic destinations seem to have a slower connection in common, but it should be plenty fast enough for the stream I'm sending. Since these destinations are able to receive similar RTP streams for other applications without packet loss, my application might be at fault. I already verified a few things: - in a tcpdump, I see all RTP packets going out on the sending machine - there is a UDP send buffer in place (I tried sizes between 64KB and 300KB) - the RTP packets mostly stay below 1400 bytes to avoid fragmentation What can a sending application do to minimize the possibility of packet loss and what would be the best way to debug such a situation ?

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• How to strink matrix using array mask in Matlab?

  - by Pyrolistical

  This seems to be a very common problem of mine. data = [1 2 3; 4 5 6]; mask = [true false true]; mask = repmat(mask, 2, 1); data(mask) ==> [1; 4; 3; 6] What I wanted was [1 3; 4 6] Yes I can just reshape it to the right size, but that seems the wrong way to do it. Is there a better way? Why doesn't data(mask) return a matrix when it is actually rectangular? I understand in the general case it may not be, but in my case since my original mask is an array it always will be.

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• xpcom array can transfer in different xul files ?

  - by jin

  Now I am developing a firefox extension, can I define a global array in a js with the main xul . and I found when I use it in another js with another xul , it could not worked , so I searched the document of Firefox development. I found a common array can not be transfered between two js files with different xul files. and then I difined a xpcom mutablearray in a js: var eleList = Components.classes["@mozilla.org/array;1"] .createInstance(Components.interfaces.nsIMutableArray); but when I want to use it in another js : it still not work , why? Thank you very much!

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• Django Per-site caching using memcached

  - by Paul

  Hi, So I'm using per-site caching on a project and I've observed the following, which is kind of confusing. When I load a flat page in my browser then change it through admin and then do a refresh (within the cache timeout) there is no change in the page--as expected. However when I stat a new session in a different browser and load the page (still within the timeout) the app is hit instead of the cache, with the Isn't the cache key generated from the URL? it seems that the session state is getting in there somewhere, which is causing a cache miss. Any ideas? thanks MIDDLEWARE_CLASSES = ( 'django.middleware.cache.UpdateCacheMiddleware', 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.middleware.gzip.GZipMiddleware', 'django.middleware.http.ConditionalGetMiddleware', 'django.middleware.doc.XViewMiddleware', 'ittybitty.middleware.IttyBittyURLMiddleware', 'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware', 'maintenancemode.middleware.MaintenanceModeMiddleware', 'djangodblog.middleware.DBLogMiddleware', 'SSL.middleware.SSLRedirect', #SSL middleware to handle SSL 'django.middleware.cache.FetchFromCacheMiddleware', )

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• How to read a csv file with python

  - by john

  Hello, I'm trying to read a csv file but it doesn't work. I can read my csv file but when I see what I read, there where white space between values. Here is my code # -*- coding: iso-8859-1 -*- import sql_db, tmpl_macros, os import security, form, common import csv class windows_dialect(csv.Dialect): """Describe the usual properties of unix-generated CSV files.""" delimiter = ',' quotechar = '"' doublequote = 1 skipinitialspace = 0 lineterminator = 'n' quoting = csv.QUOTE_MINIMAL def reco(d): cars = {210:'"', 211:'"', 213:"'", 136:'à', 143:'è', 142:'é'} for c in cars: d = d.replace(chr(c),cars[c]) return d def page_process(ctx): if ctx.req_equals('catalog_send'): if 'catalog_file' in ctx.locals.__dict__: contenu = ctx.locals.catalog_file[0].file.read() #contenu.encode('') p = csv.reader(contenu, delimiter=',') inserted = 0 modified = 0 (cr,db) = sql_db.cursor_get() for line in p: if line: logfile = open('/tmp/test.log', 'a') logfile.write(line[0]) logfile.write('\n') logfile.write('-----------------------------\n') logfile.close()

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• how to set filter for directories qt qfiledialog

  - by sneha

  hello everyone,i would like to know is there any way to select only some directories and some files at a time using qfiledialog class.here i set filesfilter..but i also need to set folder filter i mean i want only certain/some folders to be selected of name (i mean i need a filter for folders too.. coz i hav a common format for my application folders like example : name.abc,flight.abc etc all these are my folder names..i want to enable selection only for these type of folders which are named at last as .abc) i am using QStringList files = QFileDialog::getOpenFileNames(this, tr("Files & Directories"), QDir::currentPath(),tr(".doc.txt") ); tr(".doc.txt") is my files filter,same way i need folders filter with name only .abc at the end

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• Libqxt under Qt Creator

  - by I'm Dario

  I want to create a tiny app which needs global shortcuts. So, I have downloaded the current version of libqxt (0.5.1) and opened as a project in Qt Creator. Libqxt compiles without problems in this way, so I thought that adding this in the tab Dependencies of my project it would get added automatically in the build, like Eclipse does with JAR libraries (I know that are different IDEs but it seems to be a common feature among them). What happens? Qt Creator compiles qxt before my project, when needed, but when I want to include its headers Qt Creator keeps warning me that it cannot find them. Probably I am missing the correct name of headers (I tried the headers showed in qxt documentation: http://doc.libqxt.org/0.5.0/classQxtGlobalShortcut.html) By the way, I looked the code for global shortcuts and I think I can rip it out and use it in my app as is and I am going to credit qxt team and open the code of my app.

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• Boost::Asio : io_service.run() vs poll() or how do I integrate boost::asio in mainloop

  - by user300713

  Hi, I am currently trying to use boost::asio for some simple tcp networking for the first time, and I allready came across something I am not really sure how to deal with. As far as I understand io_service.run() method is basically a loop which runs until there is nothing more left to do, which means it will run until I release my little server object. Since I allready got some sort of mainloop set up, I would rather like tp update the networking loop manually from there just for the sake of simplicity, and I think io_service.poll() would do what I want, sort of like this: void myApplication::update() { myIoService.poll(); //do other stuff } This seems to work, but I am still wondering if there is a drawback from this method since that does not seem to be the common way to deal with boost::asios io services. Is this a valid approach or should I rather use io_service.run() in a non blocking extra thread?

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• Tomcat gzip while chunked issue

  - by hoodoos

  I'm expiriencing some problem with one of my data source services. As it says in HTTP response headers it's running on Apache-Coyote/1.1. Server gives responses with Transfer-Encoding: chunked, here sample response: HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Content-Type: text/xml;charset=utf-8 Transfer-Encoding: chunked Content-Encoding: gzip Date: Tue, 30 Mar 2010 06:13:52 GMT And problem is when I'm requesting server to send gzipped request it often sends not full response. I recieve response, see that last chunk recieved, but then after ungzipping I see that response is partial. I never seen such behavior with gzip turned off in request headers. So my question is: is it common tomcat issue? maybe one of it's mod which is doing compression? Or maybe it maybe some kind of proxy issue? I can't tell about versions of tomcat or what gzip mod they use, but feel free to ask, i'll try ask my service provider. Thanks.

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• Best code structure for arcade games

  - by user280454

  Hi, I've developed a few arcade games so far and have the following structure in almost all of them: I have 1 file which contains a class called kernel with the following functions: init() welcome_screen() menu_screen() help_Screen() play_game() end_screen() And another file, called Game, which basically calls all these functions and controls the flow of the game. Also, I have classes for different characters, whenever required. Is this a good code structure, or should I try having different files(classes) for different functions like welcome screen, playing, help screen, etc? As in, instead of including all the code for these things in 1 file, should I be having different classes for each one of them? The only problem I think it might cause is that I would need certain variables like score, characters, etc which are common to all of them, that's why I have all these functions in a Kernel class so that all these functions can use these variables.

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• WPF: Aligning the base line of a Label and its TextBox

  - by Heinzi

  Let's say I have a simple TextBox next to a Label: <StackPanel> <StackPanel Orientation="Horizontal"> <Label Margin="3">MyLabel</Label> <TextBox Margin="3" Width="100">MyText</TextBox> </StackPanel> ... </StackPanel> This yields the following result: As you can see, the base lines of MyLabel and MyText are not aligned, which looks ugly. Of course, I could start playing around with the margins until they match up, but since this is such a common requirement I'm sure that WPF provides a much easier and more elegant solution, which I just haven't found yet...

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• extract payload from tcpflow output

  - by Felipe Alvarez

  Tcpflow outputs a bunch of files, many of which are HTTP responses from a web server. Inside, they contain HTTP headers, including Content-type: , and other important ones. I'm trying to write a script that can extract just the payload data (i.e. image/jpeg; text/html; et al.) and save it to a file [optional: with an appropriate name and file extension]. The EOL chars are \r\n (CRLF) and so this makes it difficult to use in GNU distros (in my experiences). I've been trying something along the lines of: sed /HTTP/,/^$/d To delete all text from the the beginning of HTTP (incl) to the end of \r\n\r\n (incl) but I have found no luck. I'm looking for help from anyone with good experience in sed and/or awk. I have zero experience with Perl, please I'd prefer to use common GNU command line utilities for this Find a sample tcpflow output file here. Thanks, Felipe

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• Exposing.NET assembly as COM 101

  - by Jan Zich

  I have trouble to expose a .NET assembly in COM. It seems that I must be missing some basic step because I think I followed all tutorials and documentation I found as well as common sense, but still when I do (in a test VBScript): Set o = CreateObject("MyLib.MyClass") It keeps saying that the object cannot be created. Here are the steps I have done: I have simple one method dummy class with no attributes. The class is in a class library which has "Make assembly COM-visible" ticked in Visual Studio. The class library is signed. The DLL is registered via RegAsm.exe with the /codebase parameter (I don’t want / cannot add the DLL to GAC). Just to be sure, I tried to copy the library to the same directory as the test VBScript, but it does not help. Edit: I should have mentioned that the I can instantiate the class in COM if I put the DLL into GAC.

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• How to improve my Python regex syntax?

  - by FarmBoy

  I very new to Python, and fairly new to regex. (I have no Perl experience.) I am able to use regular expressions in a way that works, but I'm not sure that my code is particularly Pythonic or consise. For example, If I wanted to read in a text file and print out text that appears directly between the words 'foo' and 'bar' in each line (presuming this occurred one or zero times a line) I would write the following: fileList = open(inFile, 'r') pattern = re.compile(r'(foo)(.*)(bar)') for line in fileList: result = pattern.search(line) if (result != None): print result.groups()[1] Is there a better way? The if is necessary to avoid calling groups() on None. But I suspect there is a more concise way to obtain the matching String when there is one, without throwing errors when there isn't. I'm not hoping for Perl-like unreadability. I just want to accomplish this common task in the commonest and simplest way.

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• PHP job interview questions?

  - by Richard Knop

  Hello, I'm going to attend a job interview on Friday this week. It's an interview for a position of PHP programmer (the company doesn't do websites so I guess they just need somebody to administer their website). I'm expecting there will be more people at the interview and that we will be given some simple questions or tasks in PHP so they can choose. I'd like to ask if anybody has any experience with interviews like this, what should I be expecting? What are the most common questions or simple tasks/programs in PHP employers give to potential employees? Thanks.

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• how to rest my app to support mobile phone

  - by qichunren

  I am now going to develop a mobile website both support common html format page and wml format page(Because now a usual web browser on mobile can view html page and some old mobiles only support wml ) First step: register content type for wml page config/initializers/mime_types.rb Mime::Type.register_alias "text/vnd.wap.wml", :wml Second: Create two format page for an action in view: class WelcomeController < ApplicationController def index @latest_on_sale_auctions = Auction.latest(15) respond_to do |format| format.html format.wml end end end It works well as I visit: http://localhost:3000/welcome But got: Routing Error No route matches "/welcome.wml" with {:method=:get} as I visit:http://localhost:3000/welcome.wml and it works well as I visit:http://localhost:3000/welcome?format=wml my config/routes.rb like this: ActionController::Routing::Routes.draw do |map| map.root :controller => "welcome" map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format' end My rails version is 2.3.5,please help me, I want a restful app,both support html and wml.

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• To subclass or not to subclass

  - by poulenc

  I have three objects; Action, Issue and Risk. These all contain a nunber of common variables/attributes (for example: Description, title, Due date, Raised by etc.) and some specific fields (risk has probability). The question is: Should I create 3 separate classes Action, Risk and Issue each containing the repeat fields. Create a parent class "Abstract_Item" containing these fields and operations on them and then have Action, Risk and Issue subclass Abstract_Item. This would adhere to DRY principal.

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