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• FileInputStream for a generic file System

  - by Akhil

  I have a file that contains java serialized objects like "Vector". I have stored this file over Hadoop Distributed File System(HDFS). Now I intend to read this file (using method readObject) in one of the map task. I suppose FileInputStream in = new FileInputStream("hdfs/path/to/file"); wont' work as the file is stored over HDFS. So I thought of using org.apache.hadoop.fs.FileSystem class. But Unfortunately it does not have any method that returns FileInputStream. All it has is a method that returns FSDataInputStream but I want a inputstream that can read serialized java objects like vector from a file rather than just primitive data types that FSDataInputStream would do. Please help!

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• Best Work Queue service for distributed clusters

  - by onewheelgood

  Hi there. I require a simple work queue type system for asynchronous task management. I have looked at both beanstalkd and gearman. However, both these seem to assume that the client and the queue server are on the same network, and therefore that there will always be a reliable network between them. I need one that can support the client and server being in different places in the world, and be able to manage temporary loss of network connection between clusters. Ideally, this would work in such a way where I post a job to a local proxy that attempts to send it to the main queue server. If there is no network connection, it would try again later, however it would not lose the job or delay the client. Any recommendations?

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• Twisted - how to create multi protocol process and send the data between the protocols

  - by SpankMe

  Hey, Im trying to write a program that would be listening for data (simple text messages) on some port (say tcp 6666) and then pass them to one or more different protocols - irc, xmpp and so on. I've tried many approaches and digged the Internet, but I cant find easy and working solution for such task. The code I am currently fighting with is here: http://pastebin.com/ri7caXih I would like to know how to from object like: ircf = ircFactory('asdfasdf', '#asdf666') get access to self protocol methods, because this: self.protocol.dupa1(msg) returns error about self not being passed to active protocol object. Or maybe there is other, better, easier and more kosher way to create single reactor with multiple protocols and have actions triggeres when a message arrives on any of them, and then pass that message to other protocols for handling/processing/sending? Any help will be highly appreciated!

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• Good workflow with emacs+swank+slime+clojure?

  - by grm

  I just wanted opinion on good workflow using the emacs environment with clojure+swank+slime. I often find myself doing very repetitive keycommands and wonder if there is an obvious better way. I include swank with lein and start my project using lein swank from shell. Then I connect with emacs and do the correct use commands so that I can start to use (run-tests ). Then I do some coding and then want to test. To run the test I need to change buffer in emacs to the swank-repl C-x o, then I need to go to the prompt M-, then repeat the command M-p, then enter, maybe with an exception, then back to the code buffer and continue all over again with all the emacs commands. I find it a bit repetitive. I guess the solution would be to start hack on emacs and maybe add a shortcut for doing this repetitive task, but I would love to hear some suggestions because I can't be the only one who find this tedious?

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• Java - SwingWorker - problem in done() method

  - by Yatendra Goel

  I am using javax.swing.SwingWorker for the first time. I want to update a JLabel from the interim result published by the swing worker as follows: publish("Published String"); Now to update the JLabel, I have coded the following: process(List<String> chunks) { if (chunks.size() > 0) { String text = chunks.get(chunks.size() - 1); label.setText(text); } } The above code works but my problem(or to be more specific, my doubt) is as follows: The above swing worker task is an annonymous inner class so it can access label field. But what if I want to make the swing worker class a non-inner class. Should I need to pass label as an argument to the constructor of swing worker class so that the process() method can access. Or Is there any other way? What approach does other developer follow to update UI components from the swing worker class' result when the swing worker class is not an inner class?

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• Does an Intent's extras still get flattened into a Parcel even if the new activity is being started

  - by Neil Traft

  I was wondering... So if you start a new activity via an intent, the intent has to be serialized and deserialized because you may have to send the intent to a separate VM instance via IPC. But what if the PackageManager knows that your new activity will be created on the current task? It seems like a reasonably Googly optimization would be not to serialize the intent at all, since it's all happening inside the same VM. But then again, you can't just allow the new activity to use the same instance of each parcelable, because any changes made by the new activity would show up in the old activity and the programmer might not be expecting this. So, is this optimization being done? Or do the extras always get marshalled and unmarshalled, no matter what?

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• Port 80 is being used by SYSTEM (PID 4), what is that?

  - by GiH

  I am trying to use port 80 for my application server, but when I perform "netstat -aon" I get TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 When I look up the process in task manager, it shows PID 4 is SYSTEM, thats it, not extension... nothing, just "SYSTEM". Whats going on here? I'm afraid to end this process, what do I do? UPDATE: I've solved this through a stackoverflow question. Follow this link to find the solution for how to get IIS to stop listening on port 80 for a specified IP address.

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• Get application icon from ProcessSerialNumber

  - by Thomi

  I would like to get the application icon for all foreground applications running on my Mac. I'm already iterating over all applications using the Process Manager API. I have determined that any process that does not have the modeBackgroundOnly flag set in the processMode (as retrieved from GetProcessInformation()) is a "foreground" application, and shows up in the task switcher window. All I need is an API that gives me a CImageRef (or similar) that contains the application icon for a process. I'm free to use either carbon or cocoa APIs.

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• ASP.Net: Scheduled tasks in a shared environment.

  - by UpTheCreek

  This is really an extension of this question, which asked the best way to schedule tasks which need to be performed periodically within ASP.NET in a normal environment. However, I would like to ask this specifically for a Shared Hosting Environment (most of the answers to the previous question would not work in a shared environment as far as I know). One obvious solution would be to have a page which is responsible to performing the tasks on the hosted machine, and call this page from another machine (that you have full control over) using e.g. a windows scheduled task. This is a bit nasty though - are there any better approaches?

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• Transposing a matrix

  - by ZaZu

  Hello, I want to transpose a matrix, its a very easy task but its not working with me : int testtranspose(testing *test,testing *test2){ int i,j; (*test2).colsmat2=(*test).rowsmat1; (*test2).rowsmat2=(*test).colsmat1 for(i=0;i<(*test).rowsmat1;i++){ for(j=0;j<(*test).colsmat1;j++){ ((*test2).mat[i][j])=((*test).mat[i][j]); } printf("\n"); } } I thought this is the correct method of doing it, but apparently for a matrix such as : 1 2 3 4 5 6 7 8 I get : 1 2 0 0 3 4 0 0 What is the problem ? Please help, Thanks !

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• 3-legged-oauth and Google ContactsClient problem

  - by PanosJee

  Hi I am using 3-legged-oauth to import a users' Google contacts in my app. I did not find the ContactsClient library but i was using only the ContacsService and i was fetching the ContactsFeed but that resulted to not having a lot of data. After the user allows my apps i store the auth_token key and secret so i can run a cron task to fetch contacts' updates I am using this code atm: google = gdata.contacts.service.ContactsService(source=GOOGLE_OAUTH_SETTINGS['APP_NAME']) google.SetOAuthInputParameters(GOOGLE_OAUTH_SETTINGS['SIG_METHOD'], GOOGLE_OAUTH_SETTINGS['CONSUMER_KEY'], consumer_secret=GOOGLE_OAUTH_SETTINGS['CONSUMER_SECRET']) access_token = gdata.auth.OAuthToken(user_oauth_token, user_oauth_secret) access_token.oauth_input_params = google.GetOAuthInputParameters() google.SetOAuthToken(access_token) feed = google.GetContactsFeed() When i try to use the contacts client contacts_client = gdata.contacts.client.ContactsClient( source=GOOGLE_OAUTH_SETTINGS['APP_NAME']) feed2 = contacts_client.GetContacts(auth_token = access_token) I get the following error (please note that the access_token is the same as above and I user 3-legged-oauth HMAC) Actual results: File "/Library/Python/2.5/site-packages/atom/client.py", line 108, in request auth_token.modify_request(http_request)

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• How do I truncate a .NET string?

  - by Steve Guidi

  I apologize for such a question that likely has a trivial solution, but I strangely could not find a concise API for this problem. Essentially, I would like to truncate a string such that it its length is not longer than a given value. I am writing to a database table and want to ensure that the values I write meet the constraint of the column's datatype. For instance, it would be nice if I could write the following: string NormalizeLength(string value, int maxLength) { return value.Substring(0, maxLength); } Unfortunately, this raises an exception because maxLength exceeds the string boundaries. Of course, I could write a function like the following, but I was hoping that something like this already exists. string NormalizeLength(string value, int maxLength) { return value.Length <= maxLength ? value : value.Substring(0, maxLength); } Where is the elusive API that performs this task? Is there one?

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• (Visual) C++ project dependency analysis

  - by polyglot

  I have a few large projects I am working on in my new place of work, which have a complicated set of statically linked library dependencies between them. The libs number around 40-50 and it's really hard to determine what the structure was initially meant to be, there isn't clear documentation on the full dependency map. What tools would anyone recommend to extract such data? Presumably, in the simplest manner, if did the following: define the set of paths which correspond to library units set all .cpp/.h files within those to belong to those compilation units capture the 1st order #include dependency tree One would have enough information to compose a map - refactor - and recompose the map, until one has created some order. I note that http://www.ndepend.com have something nice but that's exclusively .NET unfortunately. I read something about Doxygen being able accomplish some static dependency analysis with configuration; has anyone ever pressed it into service to accomplish such a task?

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• What CPAN module can summarize Perl error logs?

  - by mithaldu

  I'm maintaining some website code that will soon dump all its errors and warnings into a log file. In order to make this a bit more pro-active I plan to parse this log file daily, summarize the warnings and errors (i.e. count the occurrence of each specific one and group by either warning/error) and then email this to the devs on the project. This would likely admittedly be rather trivial with a hash and some further fiddling, I wondered if there is a suitable module on CPAN that I could use to do this task. It would either be one that summarizes specifically Perl error/warnings logs or one that summarizes arbitrary text files. Any suggestions?

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• how to change display text in django admin foreignkey dropdown

  - by FurtiveFelon

  Hi all, I have a task list, with ability to assign users. So i have foreignkey to User model in the database. However, the default display is username in the dropdown menu, i would like to display full name (first last) instead of the username. If the foreignkey is pointing to one of my own classes, i can just change the str function in the model, but User is a django authentication model, so i can't easily change it directly right? Anyone have any idea how to accomplish this? Thanks a lot!

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• How to store account-specific information in ASP.NET MVC 2

  - by PR_

  I have an ASP.NET MVC 2 web application. There are two tables like "FIRST_KIND_OF_USERS" and "SECOND_KIND_OF_USERS". Both are mapped to the default aspnet_users table via UserId column. Each of them has it's own integer primary key column like "FirstKindOfUsersId". When a user is trying to add some data to the database, for instance, "Create a new Task" I would like to add a new row in Tasks table with "FirstKindOfUsersId" value. Where should I store or get this value? At the moment I have these possible solutions: Get "FirstKindOfUsersId" value by User.Identity.Name each time; Use SESSION[] for storing these values (Where and when should I save these ones?) Use FormsAuthenticationTicket and create own custom IIdentity class. (http://stackoverflow.com/questions/1064271/asp-net-mvc-set-custom-iidentity-or-iprincipal) Which approach is better? And if I pick the 3rd one, how to save the necessary data property and at which stage?

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• Capistrano 3, Rails 4, database configuration does not specify adapter

  - by Kazmin

  When I start cap production deploy it fails like this: DEBUG [4ee8fa7a] Command: cd /home/deploy/myapp/releases/releases/20131025212110 && (RVM_BIN_PATH=~/.rvm/bin RAILS_ENV= ~/.rvm/bin/myapp_rake assets:precompile ) DEBUG [4ee8fa7a] rake aborted! DEBUG [4ee8fa7a] database configuration does not specify adapter You can see that "RAILS_ENV=" is actually empty and I'm wondering why that might be happening? I assume that this is the reason for the latter error that I don't have a database configuration. The deploy.rb file is below: set :application, 'myapp' set :repo_url, '[email protected]:developer/myapp.git' set :branch, :master set :deploy_to, '/home/deploy/myapp/releases' set :scm, :git set :devpath, "/home/deploy/myapp_development" set :user, "deploy" set :use_sudo, false set :default_env, { rvm_bin_path: '~/.rvm/bin' } set :keep_releases, 5 namespace :deploy do desc 'Restart application' task :restart do on roles(:app), in: :sequence, wait: 5 do # Your restart mechanism here, for example: within release_path do execute " bundle exec thin restart -O -C config/thin/production.yml" end end end after :restart, :clear_cache do on roles(:web), in: :groups, limit: 3, wait: 10 do within release_path do end end end after :finishing, 'deploy:cleanup' end?

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• Programming with midi, and tuning notes to specific frequencies

  - by froggie0106

  I am working on a project in which I need to be able to generate midi notes of varying frequencies with as much accuracy as possible. I originally tried to write my program in Java, but it turns out that the sound.midi package does not support changing the tunings of notes unless the frequencies are Equal Tempered frequencies (or at least it didn't in 1.4, and I haven't been able to find evidence that this has been fixed in recent versions). I have been trying to find a more appropriate language/library to accomplish this task, but since this is my first time programming with MIDI and my need for specific tuning functionality is essential, I have been having considerable trouble finding exactly what I need. I am looking for advice from people who have experience writing MIDI programs as to what languages are useful, especially for tuning notes to specific frequencies. Any links to websites with API docs and example code would also be extremely helpful.

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• What is a good open source job scheduler in Java?

  - by Boaz

  Hi, In an application harvesting (many) RSS feeds, I want to dynamically schedule the feed downloaders based on the following criteria: The speed at which content are generated - source which produce content at a higher rate need to be visited more often. After downloading a feed, its content is analyzed and based on the current rate of publication the next run time is determined for the feed. Note that this is dynamically changing. Sometimes a feed is very active and sometimes it is slow. Every RSS feed should be visited at least once an hour. While the second one is done by most schedulers but the first one is more problematic. What JAVA-based open source scheduler would you recommend for the task? (and why ;) ) Thanks! Boaz

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• Why does Tomcat 6 hang when I shut it down?

  - by hoffmandirt

  I have Tomcat 6.0.24 64 bit installed on two Windows Server 2008 boxes as a Window's service. I use the Tomcat Monitor application to start and stop Tomcat. Randomly on both boxes, the server will not shutdown when the Stop Service option is selected. Both Start Service and Stop Service remain grayed out until I open a task manager and kill tomcat6.exe. This also happens with Tomcat 6.0.20 installed on these boxes, however it does not happen on my 32 bit Windows 7 machine. What is causing this?

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• WindowStartupLocation.CenterScreen is opening my window on the wrong display

  - by chaiguy

  According to the documentation, CenterScreen should open the window in the center of the screen that contains the mouse cursor, however this is not happening. I have a dual monitor setup, with my secondary monitor appearing to the left of my primary monitor (the one with the task bar). When the user clicks a link in my interface on the primary (right-most) monitor, and I open a new window with WindowStartupLocation set to CenterScreen, the window appears in the center of the screen of the left monitor. This is not where the mouse is and I am lost as to why it is picking that display. Has anyone experienced this before or have any ideas for a workaround? If I can't get the proper behavior using WindowStartupLocation, I will just manually move the window to the proper display (I still have to figure that out though).

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• how to invoke function writen in a validation.php and stroe all function name in database.

  - by saint

  Respected all, i'm in trouble. I created a file with name validation.php and store all my validation functionality in this file with different function names like, check_textbox(parm1, pram2, pram3, pram4) { // Definition here } check_chkBox(parm1, pram2) { // Definition here } and so on.....! then i created a table in mysql with the name tbValidation and stored all the function name with parameters in a table. the record stored in table look like as: interfaceid---------- functionNameWithReturnValue 1 ------------ check_textbox(parm1, pram2, pram3, pram4) = 1 2 ------------ check_textbox(parm1, pram2, pram4) = 0 3 ------------ check_textbox(parm1, pram2, pram4) = 1) AND (check_chkBox(parm1, pram2)=0) when i fetch record from database i want to invoke those functions that store in validation.php $data = mysql_fetch_array($drow); if($db->row_count > 0) { // when i fetch row one from database. I used this one but not working // @ $data[0] have value "check_textbox(parm1, pram2, pram3, pram4) = 1" if($data[0]) { // Do this } } How i can do this task...? :(

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• How to instantly termainate an un-supervised script on demand?

  - by errr

  I have a GUI which resembles an interpreter. It allows the user to write a script in Jython (implementation of Python in Java) and run it whenever he wants. Apart from that, I also wish to allow the user to instantly terminate the run whenever he wants. Thing is, I don't really know how to do it. The script is being run on a different Thread, but I don't know of any secure way to stop/interrupt/terminate a thread in the middle of its run, let alone not knowing what is being run by the thread/script (it could be a simple task or maybe some sort of a heavy SQL query against a DB, and a DB is something which requires careful resource handling). How can I instantly terminate such run on demand?

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• Building a minimal plugin architecture in Python.

  - by dF

  I have an application, written in Python, which is used by a fairly technical audience (scientists). I'm looking for a good way to make the application extensible by the users, i.e. a scripting/plugin architecture. I am looking for something extremely lightweight. Most scripts, or plugins, are not going to be developed and distributed by a third-party and installed, but are going to be something whipped up by a user in a few minutes to automate a repeating task, add support for a file format, etc. So plugins should have the absolute minimum boilerplate code, and require no 'installation' other than copying to a folder (so something like setuptools entry points, or the Zope plugin architecture seems like too much.) Are there any systems like this already out there, or any projects that implement a similar scheme that I should look at for ideas / inspiration?

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• Is it possible to convert Gregorian to Hijri date in Vb ?

  - by ahmed

  Hi, I have a table in sql where the date format is stored in Hijri. Now I am working on a vb.net application where I have to let the user update that dateField. So is it possible that if I place a datepicker(which is in Gregorian) and user selects the date and its converts into Hijri date before updating. I mean when the user selects the date and clicks the save button the date should be updated in hijri format in the sql . For now , the user is entering the date manually on a tms AdvEdit. Is there any code available to accomplish this task. Thanking you all in advance for your time and consideration.

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