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• Masters in Computer Science

  - by reko

  Hi, My name is Gautam. I come from India. I am extremely passionate about Web Development.. I like to build web applications all the time.. Can I make this web application building a full time profession? I have just graduated from bachelors... Is there a Master of Computer Science in Web Development? Can I choose Masters in Web Development? Is it a bad choice? Is there a course very close to it Web Development that I can choose? Should I just keep Web Development as a part time thing to do?? Could you please let me know any good universities which offer this course/ close to this course for Spring 2010? Please advice on what I should do because my mind keeps throwing millions of questions on what I should do and my only hope is STACKOVERFLOW helps me as it always does to solve problems.. Looking forward for your reply.. Thanks in advance Regards, Gautam

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• Can't install do_mysql gem?

  - by maccy1

  I'm trying to install the do_mysql on my Snow Leopord system Macbook Pro 13", but I keep getting this error: n216-160:~ myself$ sudo gem1.9 install do_mysql Password: Building native extensions. This could take a while... ERROR: Error installing do_mysql: ERROR: Failed to build gem native extension. /opt/local/bin/ruby1.9 extconf.rb checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/opt/local/bin/ruby1.9 --with-mysql-config --without-mysql-config --with-mysql-dir --without-mysql-dir --with-mysql-include --without-mysql-include=${mysql-dir}/include --with-mysql-lib --without-mysql-lib=${mysql-dir}/lib --with-mysqlclientlib --without-mysqlclientlib Gem files will remain installed in /opt/local/lib/ruby1.9/gems/1.9.1/gems/do_mysql-0.10.0 for inspection. Results logged to /opt/local/lib/ruby1.9/gems/1.9.1/gems/do_mysql-0.10.0/ext/do_mysql_ext/gem_make.out n216-160:~ myself$ I have no idea why. I also reinstalled my verison of MySQL with the MySQL 5.4.3 beta, 64-bit as others suggested but no dice. Does anyone have any idea what is wrong?

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• Personal Cache vs Memcache?

  - by Kerry

  I have a personal caching class, which can be seen here ( based off WordPress' ): http://pastie.org/988427 I recently learned about memcache and it said to memcache EVERYTHING: http://highscalability.com/blog/2010/5/17/7-lessons-learned-while-building-reddit-to-270-million-page.html My first thought was just to keep my class with the current functions and make it use memcache instead -- is there any downside to doing this? The main difference I see is that memcache stays on with the server from page to page, while mine is for 1 page load. The problem I see arising, and this is with any system, is that they're dynamic. They change all the time. Whether its search results, visible products, etc. etc. If it's all cached, won't the create a problem? Is there a way to handle this? Obviously if something is bringing back the same results everytime it would be cached, but that's why I was doing it on a per page load basis. I'm sure there is a way to handle this, or is the cache time usually set between 5 minutes and an hour?

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• SO what RDF database do i use for product attribute situation initially i thought about using EAV?

  - by keisimone

  Hi, i have a similar issue as espoused in http://stackoverflow.com/questions/695752/product-table-many-kinds-of-product-each-product-has-many-parameters i am convinced to use RDF now. only because of one of the comments made by Bill Karwin in the answer to the above issue but i already have a database in mysql and the code is in php. 1) So what RDF database should I use? 2) do i combine the approach? meaning i have a class table inheritance in the mysql database and just the weird product attributes in the RDF? I dont think i should move everything to a RDF database since it is only just products and the wide array of possible attributes and value that is giving me the problem. 3) what php resources, articles should i look at that will help me better in the creation of this? 4) more articles or resources that helps me to better understand RDF in the context of the above challenge of building something that will better hold all sorts of products' attributes and values will be greatly appreciated. i tend to work better when i have a conceptual understanding of what is going on. Do bear in mind i am a complete novice to this and my knowledge of programming and database is average at best.

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• how to parametrize an import in a View?

  - by Gianluca Colucci

  Hello everybody, I am looking for some help and I hope that some good soul out there will be able to give me a hint :) In the app I am building, I have a View. When an instance of this View gets created, it "imports" (MEF) the corresponding ViewModel. Here some code: public partial class ContractEditorView : Window { public ContractEditorView () { InitializeComponent(); CompositionInitializer.SatisfyImports(this); } [Import(ViewModelTypes.ContractEditorViewModel)] public object ViewModel { set { DataContext = value; } } } and here is the export for the ViewModel: [PartCreationPolicy(CreationPolicy.NonShared)] [Export(ViewModelTypes.ContractEditorViewModel)] public class ContractEditorViewModel: ViewModelBase { public ContractEditorViewModel() { _contract = new Models.Contract(); } } Now, this works if I want to open a new window to create a new contract... But it does not if I want to use the same window to edit an existing contract... In other words, I would like to add a second construct both in the View and in the ViewModel: the original constructor would accept no parameters and therefore it would create a new contract; the new construct - the one I'd like to add - I'd like to pass an ID so that I can load a given entity... What I don't understand is how to pass this ID to the ViewModel import... Thanks in advance, Cheers, Gianluca.

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• Trying to compile a linux-based app on Mac OS X

  - by Scott

  I'm just trying to compile the linux-based FCEUX (NES emulator) on my mac, OS X 10.5 Leopard. I got all the dependencies (SDL, GTK+ 2) going and everything but of all things this is now my problem: Undefined symbols: "_compress", referenced from: SaveSnapshot() in video.o "_gzclose", referenced from: FCEU_fopen(char const*, char const*, char*, char*, int, char const**)in file.o "_crc32", referenced from: CalcCRC32(unsigned int, unsigned char*, unsigned int)in crc32.o _unzReadCurrentFile in unzip.o _unzReadCurrentFile in unzip.o "_uncompress", referenced from: NetplayUpdate(unsigned char*)in netplay.o FCEUSS_LoadFP(EMUFILE*, ENUM_SSLOADPARAMS) in state.o "_compress2", referenced from: FCEUNET_SendFile(unsigned char, char*)in netplay.o FCEUSS_SaveMS(EMUFILE*, int) in state.o "_inflateEnd", referenced from: _unzCloseCurrentFile in unzip.o "_inflate", referenced from: _unzReadCurrentFile in unzip.o "inflateInit2", referenced from: _unzOpenCurrentFile in unzip.o "_gzgetc", referenced from: FCEU_fopen(char const*, char const*, char*, char*, int, char const**)in file.o "_gzopen", referenced from: FCEU_fopen(char const*, char const*, char*, char*, int, char const**)in file.o "_gzread", referenced from: FCEU_fopen(char const*, char const*, char*, char*, int, char const**)in file.o "_gzseek", referenced from: FCEU_fopen(char const*, char const*, char*, char*, int, char const*)in file.o ld: symbol(s) not found collect2: ld returned 1 exit status scons: ** [src/fceux] Error 1 scons: building terminated because of errors. Those are zlib functions. It seems like it is loading the zlib.h ok, but the symbols aren't being linked in? Just to make sure I downloaded the latest zlib and did a make install, no help. I have no clue what's going on here, it seems like it should be pretty basic, that library is nothing special. Help would be appreciated. Thanks.

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• Custom data forms in CakePHP

  - by Affian

  I'm building a controller to manage group based ACL in CakePHP and when I create or edit a group I want to be able to select what permissions it has. The group data table only stores a group ID and a group Name as the permissions are stored in the ACO/ARO table. I have an array from the ACO that I want to turn into a set of checkboxes so you can check them to allow access from that group to that ACO. So first off, how do I turn this array into a set of checkboxes. The array looks like this: array( [0] => array( [Aco] => array( [alias] => 'alias' [id] => 1) [children] => array ( [0] => array( [Aco]=> ...etc )) [1] => array( ...etc ) My next question is how can I check these once the form has been submitted to the controller to allow the selected actions? [Update] Ok changing the angle of my question, how can I use the Form helper to create forms that are not based on any Model?

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• Is there a way to prevent Maven Test from rebuilding the database?

  - by Christopher W. Allen-Poole

  I've recently been asked to, effectively, sell my department on unit testing. I can't tell you how excited this makes me, but I do have one concern. We're using JUnit with Spring and Maven, and this means that each time mvn test is called, it rebuilds the database. Obviously, we can't integrate that with our production server -- it would kill valuable data. How do I prevent the rebuilding without telling maven to skip testing? The best I could figure was to assign the script to operate in a test database (line breaks added for readability): mvn test -Ddbunit.schema=<database>test -Djdbc.url=jdbc:mysql://localhost/<database>test? createDatabaseIfNotExist=true&amp; useUnicode=true&amp;characterEncoding=utf-8 I can't help but think there must be a better way. I'm especially interested in learning if there is an easy way to tell Maven to only run tests on particular classes without building anything else? mvn -Dtest=<test-name> test still rebuilds the database. ======= update ======= Bit of egg on my face here. I didn't realize that I was using the same variable in two places, meaning that the POM was using a "skip.test" variable for both rebuilding the database and for running the tests...

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• Patterns for non-layered applications

  - by Paul Stovell

  In Patterns of Enterprise Application Architecture, Martin Fowler writes: This book is thus about how you decompose an enterprise application into layers and how those layers work together. Most nontrivial enterprise applications use a layered architecture of some form, but in some situations other approaches, such as pipes and filters, are valuable. I don't go into those situations, focussing instead on the context of a layered architecture because it's the most widely useful. What patterns exist for building non-layered applications/parts of an application? Take a statistical modelling engine for a financial institution. There might be a layer for data access, but I expect that most of the code would be in a single layer. Would you still expect to see Gang of Four patterns in such a layer? How about a domain model? Would you use OO at all, or would it be purely functional? The quote mentions pipes and filters as alternate models to layers. I can easily imagine a such an engine using pipes as a way to break down the data processing. What other patterns exist? Are there common patterns for areas like task scheduling, results aggregation, or work distribution? What are some alternatives to MapReduce?

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• Weirdness with cabal, HTF, and HUnit assertions

  - by rampion

  So I'm trying to use HTF to run some HUnit-style assertions % cat tests/TestDemo.hs {-# OPTIONS_GHC -Wall -F -pgmF htfpp #-} module Main where import Test.Framework import Test.HUnit.Base ((@?=)) import System.Environment (getArgs) -- just run some tests main :: IO () main = getArgs >>= flip runTestWithArgs Main.allHTFTests -- all these tests should fail test_fail_int1 :: Assertion test_fail_int1 = (0::Int) @?= (1::Int) test_fail_bool1 :: Assertion test_fail_bool1 = True @?= False test_fail_string1 :: Assertion test_fail_string1 = "0" @?= "1" test_fail_int2 :: Assertion test_fail_int2 = [0::Int] @?= [1::Int] test_fail_string2 :: Assertion test_fail_string2 = "true" @?= "false" test_fail_bool2 :: Assertion test_fail_bool2 = [True] @?= [False] And when I use ghc --make, it seems to work correctly. % ghc --make tests/TestDemo.hs [1 of 1] Compiling Main ( tests/TestDemo.hs, tests/TestDemo.o ) Linking tests/TestDemo ... % tests/TestDemoA ... * Tests: 6 * Passed: 0 * Failures: 6 * Errors: 0 Failures: * Main:fail_int1 (tests/TestDemo.hs:9) * Main:fail_bool1 (tests/TestDemo.hs:12) * Main:fail_string1 (tests/TestDemo.hs:15) * Main:fail_int2 (tests/TestDemo.hs:19) * Main:fail_string2 (tests/TestDemo.hs:22) * Main:fail_bool2 (tests/TestDemo.hs:25) But when I use cabal to build it, not all the tests that should fail, fail. % cat Demo.cabal ... executable test-demo build-depends: base >= 4, HUnit, HTF main-is: TestDemo.hs hs-source-dirs: tests % cabal configure Resolving dependencies... Configuring Demo-0.0.0... % cabal build Preprocessing executables for Demo-0.0.0... Building Demo-0.0.0... [1 of 1] Compiling Main ( tests/TestDemo.hs, dist/build/test-demo/test-demo-tmp/Main.o ) Linking dist/build/test-demo/test-demo ... % dist/build/test-demo/test-demo ... * Tests: 6 * Passed: 3 * Failures: 3 * Errors: 0 Failures: * Main:fail_int2 (tests/TestDemo.hs:23) * Main:fail_string2 (tests/TestDemo.hs:26) * Main:fail_bool2 (tests/TestDemo.hs:29) What's going wrong and how can I fix it?

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• Python: slow read & write for millions of small files

  - by Jami

  I am building directory tree which has tons of subdirectories and files. The total directory count is somewhere along 256^32 subdirectories with 256 files in each end which are only a few bytes long. I did this so I would have fast access to these files (since i'm not searching and i'm just directly accessing then via a known file path) I have a python script that builds this filesystem and reads & writes those files. The problem is that when I reach more than 1Gb of total filesize, the read and write methods become extremely slow. Here's the function I have that reads the contents of a file (the file contains an integer string), adds a certain number to it, then writes it back to the original file. def addInFile(path, scoreToAdd): num = scoreToAdd try: shutil.copyfile(path, '/tmp/tmp.txt') fp = open('/tmp/tmp.txt', 'r') num += int(fp.readlines()[0]) fp.close() except: pass fp = open('/tmp/tmp.txt', 'w') fp.write(str(num)) fp.close() shutil.copyfile('/tmp/tmp.txt', path) I previously tried performing linux console commands but it was slower. I copy the file to a temporary file first then access/modify it then copy it back because i found this was faster than directly accessing the file. I think the cause of the slowdown is because there're tons of files. performing this function 1000 times sometimes reach 1 minute now, but before (when there were only a few files, 1000 calls was performed for only less than 1 second) How do you suggest I fix this?

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• How to use Struts 2 with JFreeChart?

  - by Pere

  Firstly, I went here ( http://code.google.com/p/struts2-examples/downloads/list and I downloaded Hello_World_Struts2_Mvn.zip) and I run that example. After that, I went here (http://struts.apache.org/2.x/docs/jfreechart-plugin.html), I add the dependencies for commons-lang-2.5.jar, jcommon-1.0.16.jar and jfreechart-1.0.13.jar and I modify the example downloaded from code.google.com to see how JFreeChart is working, but I receive this error: Unable to load configuration. - action - file:/C:/.../untitled_war_exploded/WEB-INF/classes/struts.xml:34:67 Caused by: Error building results for action createChart in namespace - action - file:/C:/.../out/artifacts/untitled_war_exploded/WEB-INF/classes/struts.xml:34:67 Caused by: There is no result type defined for type 'chart' mapped with name 'success'. Did you mean 'chart'? - result - file:/C:/.../out/artifacts/untitled_war_exploded/WEB-INF/classes/struts.xml:36:49 At the line 36 in struts.xml is the this code (the code from struts2 website): <action name="viewModerationChart" class="myapp.actions.ViewModerationChartAction"> <result name="success" type="chart"> <param name="width">400</param> <param name="height">300</param> </result> </action> What I'm doing wrong?

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• How to debug into my apache module built using a Makefile?

  - by AJ

  Firstly, I come from Windows-VisualStudio-C++ background. Now I am developing in a Ubuntu environment. With the help of a Makefile, I built a mymodule.so and copied it to the modules folder within apache. Now, it appears that the module is working fine. But I would like to debug into this module to understand it better. So, first, is there any way I can get something similar to the Visual Studio debugger type of feel while debugging this module? Now, i read that i can use gdb to debug into apache modules, can somebody tell me in detail how this is done or point me to some resource that does it. Ideally, i would like to single step and stuff. I am trying Code::Blocks IDE which has some debugging support. Using the IDE and custom make file, I build the module. Copied it to module location, but how do i debug. How do i hook to the apache process. Should I use Attach to Process. I tried that with the pid of httpd, but with no success. Also, while building is there some flag that i should set so that the .so file is debuggable? I am pretty basic with Linux because i come from windows programming background. Kindly suggest how I go about this. Thanks in advance, Arjun

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• Internal "Tee" setup

  - by RadlyEel

  I have inherited some really old VC6.0 code that I am upgrading to VS2008 for building a 64-bit app. One required feature that was implemented long, long ago is overriding std::cout so its output goes simultaneously to a console window and to a file. The implementation depended on the then-current VC98 library implementation of ostream and, of course, is now irretrievably broken with VS2008. It would be reasonable to accumulate all the output until program termination time and then dump it to a file. I got part of the way home by using freopen(), setvbuf(), and ios::sync_with_stdio(), but to my dismay, the internal library does not treat its buffer as a ring buffer; instead when it flushes to the output device it restarts at the beginning, so every flush wipes out all my accumulated output. Converting to a more standard logging function is not desirable, as there are over 1600 usages of "std::cout << " scattered throughout almost 60 files. I have considered overriding ostream's operator<< function, but I'm not sure if that will cover me, since there are global operator<< functions that can't be overridden. (Or can they?) Any ideas on how to accomplish this?

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• Are these settings correct for sending mail through Rails/Gmail?

  - by aressidi

  Hi there, I spend a good deal of time building an email system for my Rails app that uses Gmail to send bulk mail to a list of opt-in users. I realize a shortcomming of using Google Apps for my mail, namely a rate limit on the number of emails it will send out (i believe 500). Anyway, I have reached out to my users to see how many have received the email, and a lot of them have not, though some have. The list I tried sending to was about 540 users, so I would have expected more "yes, got it," then "nope, still waiting" responses. I have two questions: Do these settings look correct for outgoing bulk mailing through Gmail? Again, using google apps to manage my domain and i know some people (including myself) have received the mailer. This is in a mail.rb initializer in my app. ActionMailer::Base.delivery_method = :sendmail ActionMailer::Base.smtp_settings = { :address => "smtp.gmail.com", :port => 25, :domain => "mydomain.com", :authentication => :login, :user_name => "[email protected]", :password => "mypass" } Is there any way I can test if the mail was delivered, or at least attempted to be delivered? I can't tell where in the list the mailer stops mailing! The way I generate the list is through a query which then passes the user info to a mailer worker which sends the emails out via Starling/Workling. Any advice here would be useful. Happy to post code, but want to make sure the method I'm using is sound. Thanks for the help!

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• C# Multithreaded Domain Design

  - by Thijs Cramer

  Let's say i have a Domain Model that im trying to make compatible with multithreading. The prototype domain is a game domain that consists of Space, SpaceObject, and Location objects. A SpaceObject has the Move method and Asteroid and Ship extend this object with specific properties for the object (Ship has a name and Asteroid has a color) Let's say i want to make the Move method for each object run in a seperate thread. That would be stupid because with 10000 objects, i would have 10000 threads. What would be the best way to seperate the workload between cores/threads? I'm trying to learn the basics of concurrency, and building a small game to prototype a lot of concepts. What i've already done, is build a domain, and a threading model with a timer that launches events based on intervals. If the event occurs i want to update my entire model with the new locations of any SpaceObject. But i don't know how and when to launch new threads with workloads when the event occurs. Some people at work told me that u can't update your core domain multithreaded, because you have to synch everything. But in that case i can't run my game on a dual quadcore server, because it would only use 1 CPU for the hardest tasks. Anyone know what to do here?

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• Suggestions for a Cron like scheduler in Python?

  - by jamesh

  I'm looking for a library in Python which will provide at and cron like functionality. I'd quite like have a pure Python solution, rather than relying on tools installed on the box; this way I run on machines with no cron. For those unfamiliar with cron: you can schedule tasks based upon an expression like: 0 2 * * 7 /usr/bin/run-backup # run the backups at 0200 on Every Sunday 0 9-17/2 * * 1-5 /usr/bin/purge-temps # run the purge temps command, every 2 hours between 9am and 5pm on Mondays to Fridays. The cron time expression syntax is less important, but I would like to have something with this sort of flexibility. If there isn't something that does this for me out-the-box, any suggestions for the building blocks to make something like this would be gratefully received. Edit I'm not interested in launching processes, just "jobs" also written in Python - python functions. By necessity I think this would be a different thread, but not in a different process. To this end, I'm looking for the expressivity of the cron time expression, but in Python. Cron has been around for years, but I'm trying to be as portable as possible. I cannot rely on its presence.

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• NSFetchedResultsController is driving me crazy

  - by user267980

  Hi everyone. i've been building an app since 1 month using NSFetchedResultsController and i was testing the app on the 3.1.2 SDK. The poblem is that i've been using NSFetchedResultsController everywhere in my app and was working on the 3.1.2 version of the SDK, now my client say that i should make it compatible with the 3.0 version and the deadline is almost there. But is crashing everytime i change an object handled by the contoller, the application is crashing with very weird errors. The problem occure when removing the last object in a section and when a change make an object love to another section. I've been using a sample code from "More iPhone 3 Development Tackling iPhone SDK 3" by Dave Mark and Jeff LaMarche. I've also included some changes from link text Here is a sample output of the console when the application is crashing. * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of sections. The number of sections contained in the table view after the update (1) must be equal to the number of sections contained in the table view before the update (2), plus or minus the number of sections inserted or deleted (2 inserted, 0 deleted).' 2010-03-14 16:23:29.758 Instaproofs[5879:207] Stack: ( 807902715, 7364425, 807986683, 811271572, 815059090, 815007323, 211023, 4363331, 810589786, 807635429, 810579728, 3620573, 3620227, 3614682, 3609719, 27337, 810595174, 807686849, 807683624, 839142449, 839142646, 814752238 ) If i knew that NSFetchedResultsController is so buggy, i would never used it. So basicaly i need the my NSFetchedResultsControllerDelegate to work fine on the 3.0 and above SDKs. It would be life saver if someone help me figure out what i'm doing wrong.

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• accumulator don't compile

  - by Abruzzo Forte e Gentile

  HI All I am using boost accumulators. These 2 lines use to work fine with current version of boost in LInux. accumulator_set< double, stats< tag::covariance<double, tag::covariate1> > > acc_cov; accumulator_set< double, stats< tag::variance > > acc_var; When I moved to a Sun machine where it is installed boost v1.40 I have this building error "/opt/boost/boost/accumulators/framework/depends_on.hpp", line 276: Error:<no tag> cannot be initialized in a constructor. "/opt/boost/boost/fusion/container/list/cons.hpp", line 85: Where: While instantiating "boost::accumulators::detail::accumulator_wrapper<int, int>::accumulator_wrapper(const boost::accumulators::detail::accumulator_wrapper<int, int>&)". "/opt/boost/boost/fusion/container/list/cons.hpp", line 85: Where: Instantiated from non-template code. 1 Error(s) Do you know how can I fix those errors and why I have this issue? Thanks AFG

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• How to structure applications as multiple projects an name the packages in Java

  - by lostiniceland

  Hello Everyone I would like to know how you set up your projects in Java For example, in my current work-project, a six year old J2EE app with approximately 2 million LoC, we only have one project in Eclipse. The package structure is split into tiers and then domains, so it follows guidelines from Sun/Oracle. A huge ant-script is building different jars out of this one source-folder Personally I think it would be better to have multiple projects, at least for each tier. Recently I was playing around with a projects-structure like this: Domainproject (contains only annotated pojos, needed by all other projects) Datalayer (only persistence) Businesslogic (services) Presenter View This way, it should be easier to exchange components and when using a build tool like Maven I can have everything in a repository so when only working on the frontend I can get the rest as a dependecy in my classpath. Does this makes sense to you? Do you use different approaches and how do they look like? Furthermore I am struggeling how to name my packages/projects correctly. Right now, the above project-structure reflects in the names of the packages, eg. de.myapp.view and it continues with some technical subfolders like internal or interfaces. What I am missing here, and I dont know how to do this properly, is the distinction to a certain domain. When the project gets bigger it would be nice to recognise a particular domain but also the technical details to navigate more easily within the project. This leads to my second question: how do you name your projects and packages?

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• How do i write tasks? (parallel code)

  - by acidzombie24

  I am impressed with intel thread building blocks. I like how i should write task and not thread code and i like how it works under the hood with my limited understanding (task are in a pool, there wont be 100 threads on 4cores, a task is not guaranteed to run because it isnt on its own thread and may be far into the pool. But it may be run with another related task so you cant do bad things like typical thread unsafe code). I wanted to know more about writing task. I like the 'Task-based Multithreading - How to Program for 100 cores' video here http://www.gdcvault.com/sponsor.php?sponsor_id=1 (currently second last link. WARNING it isnt 'great'). My fav part was 'solving the maze is better done in parallel' which is around the 48min mark (you can click the link on the left side. That part is really all you need to watch if any). However i like to see more code examples and some API of how to write task. Does anyone have a good resource? I have no idea how a class or pieces of code may look after pushing it onto a pool or how weird code may look when you need to make a copy of everything and how much of everything is pushed onto a pool.

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• Unable to upgrade PEAR from 1.9.2 to 1.9.4

  - by user940768

  I am on a Ubuntu 11.10 and trying to upgrade from 1.9.2 to 1.9.4, but it simply don't work. Here are the commands I am following in sequence $ sudo apt-get install php-pear Reading package lists... Done Building dependency tree Reading state information... Done php-pear is already the newest version. The following packages were automatically installed and are no longer required: linux-headers-3.0.0-14-generic-pae libaccess-bridge-java-jni libaccess-bridge-java Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded. $ sudo pear channel-update pear.php.net Updating channel "pear.php.net" Channel "pear.php.net" is up to date $ sudo pear upgrade-all Nothing to upgrade-all $ sudo pear install –alldeps pear.phpunit.de/PHPUnit parsePackageName(): invalid package name "–alldeps" in "–alldeps" invalid package name/package file "–alldeps" Did not download optional dependencies: phpunit/PHP_Invoker, use --alldeps to download automatically phpunit/PHPUnit requires PEAR Installer (version >= 1.9.4), installed version is 1.9.2 phpunit/PHPUnit can optionally use package "phpunit/PHP_Invoker" (version >= 1.1.0) phpunit/Text_Template requires PEAR Installer (version >= 1.9.4), installed version is 1.9.2 phpunit/PHP_CodeCoverage requires PEAR Installer (version >= 1.9.4), installed version is 1.9.2 phpunit/PHP_CodeCoverage requires package "phpunit/Text_Template" (version >= 1.1.1) phpunit/PHP_CodeCoverage can optionally use PHP extension "xdebug" (version >= 2.0.5) phpunit/PHPUnit_MockObject requires PEAR Installer (version >= 1.9.4), installed version is 1.9.2 phpunit/PHPUnit_MockObject requires package "phpunit/Text_Template" (version >= 1.1.1) phpunit/PHP_TokenStream requires PEAR Installer (version >= 1.9.4), installed version is 1.9.2 No valid packages found install failed Any thoughts?

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• Adding a new target type to msbuild: How do I refer to the itemname in the task rules?

  - by jmucchiello

  I'm trying to add a task to build the COM proxy DLL after building the main DLL. So I created the following in a .target file: <Target Name="ProxyDLL" Inputs="$(IntDir)%(WHATGOESHERE)_i.c;$(IntDir)dlldata.c" Outputs="$(OutDir)%(WHATGOESHERE)ps.dll" AfterTargets="Link"> <CL Sources="$(IntDir)%(WHATGOESHERE)_i.c;$(IntDir)dlldata.c" /> </Target> And reference it from the .vcxproj file as <ItemGroup> <ProxyDLL Include="FTAccountant" /> </ItemGroup> So the FTAccountant.DLL file is created through the normal build process and then when attempts to compile the proxy stubs it creates these command lines: cl /c dir\_i.c dir\dlldata.c And of course it can't find _i.c. The first attempt, I put %(Filename) in the WHATGOESHERE space and I got this error: C:\ActivePay\Build\Proxy DLL.targets(6,3): error MSB4095: The item metadata %(Filename) is being referenced without an item name. Specify the item name by using %(itemname.Filename). So I changed it to %(itemname.Filename) and that is an empty string. How to get the value specified in the task's Include attribute and use it within the task?

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• Can't get correct package from Nexus? error in "mvn help:effective-settings"

  - by larry cai

  I use nexus opensource version maven 2.2.1 When I type "mvn help:effective-settings", i got the error below [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'help'. [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Error building POM (may not be this project's POM). Project ID: org.apache.maven.plugins:maven-help-plugin Reason: Error getting POM for 'org.apache.maven.plugins:maven-help-plugin' from the repository: Failed to resolve artifact, possibly due to a repository list that is not appropriately equipped for this artifact's metadata. org.apache.maven.plugins:maven-help-plugin:pom:2.2-SNAPSHOT from the specified remote repositories: Nexus (http://192.168.56.191:8081/nexus/content/groups/public) for project org.apache.maven.plugins:maven-help-plugin When I check the local repository under ~.m2\repository\org\apache\maven\plugins\maven-help-plugin It has a file maven-metadata-central.xml <?xml version="1.0" encoding="UTF-8"?> <metadata> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-help-plugin</artifactId> <versioning> <latest>2.2-SNAPSHOT</latest> <release>2.1.1</release> <versions> <version>2.0</version> <version>2.0.1</version> <version>2.0.2</version> <version>2.1</version> <version>2.1.1</version> <version>2.2-SNAPSHOT</version> </versions> <lastUpdated>20100519065440</lastUpdated> </versioning> </metadata> And I can't find any jar files under directory, what's wrong with nexus server ? I can't easily find support information from nexus. Any hints

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• What is a faster way of merging the values of this Python structure into a single dictionary?

  - by jcoon

  I've refactored how the merged-dictionary (all_classes) below is created, but I'm wondering if it can be more efficient. I have a dictionary of dictionaries, like this: groups_and_classes = {'group_1': {'class_A': [1, 2, 3], 'class_B': [1, 3, 5, 7], 'class_c': [1, 2], # ...many more items like this }, 'group_2': {'class_A': [11, 12, 13], 'class_C': [5, 6, 7, 8, 9] }, # ...and many more items like this } A function creates a new object from groups_and_classes like this (the function to create this is called often): all_classes = {'class_A': [1, 2, 3, 11, 12, 13], 'class_B': [1, 3, 5, 7, 9], 'class_C': [1, 2, 5, 6, 7, 8, 9] } Right now, there is a loop that does this: all_classes = {} for group in groups_and_classes.values(): for c, vals in group.iteritems(): for v in vals: if all_classes.has_key(c): if v not in all_classes[c]: all_classes[c].append(v) else: all_classes[c] = [v] So far, I changed the code to use a set instead of a list since the order of the list doesn't matter and the values need to be unique: all_classes = {} for group in groups_and_classes.values(): for c, vals in group.iteritems(): try: all_classes[c].update(set(vals)) except KeyError: all_classes[c] = set(vals) This is a little nicer, and I didn't have to convert the sets to lists because of how all_classes is used in the code. Question: Is there a more efficient way of creating all_classes (aside from building it at the same time groups_and_classes is built, and changing everywhere this function is called)?

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