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• Big datastructures in functional programming

  - by Denis Gorodetskiy

  I'm newbie in Functional Programming. I have a huge neural network with thousands of neurons and every connection between neurons has its weight. I have to update these weights very often, several thousand times per learning session. Is FP still applicable here? I mean in fp we can't modify variables and only able to return new variables not changing previous values. Does this mean I have to recreate whole network on every weight update?

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• Convert String to java.util.Date

  - by Vinayak.B

  Hi Folks, I storing the date to SQLite database in the format d-MMM-yyyy,HH:mm:ss aaa And again retrieving it with the same format, the problem now is, I am gettin every thing fine exepth the Hour. Hour I am geting 00 every time, Here the print statement String date--->29-Apr-2010,13:00:14 PM After convrting Date--->1272479414000--Thu Apr 29 00:00:14 GMT+05:30 2010 Please where I am doing wrong. Cheers, Vinayak

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• System architecture: simple approach for setting up background tasks behind a web application -- wil

  - by Tim Molendijk

  I have a Django web application and I have some tasks that should operate (or actually: be initiated) on the background. The application is deployed as follows: apache2-mpm-worker; mod_wsgi in daemon mode (1 process, 15 threads). The background tasks have the following characteristics: they need to operate in a regular interval (every 5 minutes or so); they require the application context (i.e. the application packages need to be available in memory); they do not need any input other than database access, in order to perform some not-so-heavy tasks such as sending out e-mail and updating the state of the database. Now I was thinking that the most simple approach to this problem would be simply to piggyback on the existing application process (as spawned by mod_wsgi). By implementing the task as part of the application and providing an HTTP interface for it, I would prevent the overhead of another process that is holding all of the application into memory. A simple cronjob can be setup that sends a request to this HTTP interface every 5 minutes and that would be it. Since the application process provides 15 threads and the tasks are quite lightweight and only running every 5 minutes, I figure they would not be hindering the performance of the web application's user-facing operations. Yet... I have done some online research and I have seen nobody advocating this approach. Many articles suggest a significantly more complex approach based on a full-blown messaging component (such as Celery, which uses RabbitMQ). Although that's sexy, it sounds like overkill to me. Some articles suggest setting up a cronjob that executes a script which performs the tasks. But that doesn't feel very attractive either, as it results in creating a new process that loads the entire application into memory, performs some tiny task, and destroys the process again. And this is repeated every 5 minutes. Does not sound like an elegant solution. So, I'm looking for some feedback on my suggested approach as described in the paragraph before the preceeding paragraph. Is my reasoning correct? Am I overlooking (potential) problems? What about my assumption that application's performance will not be impeded?

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• asp.net mvc session and custom MembershipProvider

  - by niao

  Greetings, in my ASP.NET MVC application I've created a custom MembershipProvider. It works fine, however when user is successfully logged, I would like to create an Operator object and make it possible to access this object on every controller and view. I was thinking about session to do this but when session expires this object is null but user that had been logged using MembershipProvider is still logged in. Is there any way I can store my Operator object in MembershipProvider and access it on every controller and view I need?

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• django: caching passwords for custom authentication

  - by gruszczy

  I am authenticating users in ldap, but this happens only once, when user is logging in. Afterwards I need to keep username and password, because before every ldap operation I need to make bind on ldap server before every operation. What is the safe way to cache this password (I can't store in the database or cookies) for as long as session persists.

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• problems with jruby version of ruby-debug

  - by jshen

  Whenever I use 'n' to step over a line it steps into it instead. This happens to me on all the versions of jruby i've tried, the latest being 1.3.1 Does it work right for anyone? If so any idea how to fix it, because it's too painful when it steps into every function every time. Also, I use it like this if it makes any difference. require 'ruby-debug'; debugger

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• Salt question - using a "random salt"

  - by barfoon

  Hey everyone, Further to my question here, I have another question regarding salts. When someone says "use a random salt" to pre/append to a password, does this mean: Creating a static a 1 time randomly generated string of characters, or Creating a string of characters that changes at random every time a password is created? If the salt is random for every user and stored along with the hashed password, how is the original salt ever retrieved back for verification? Thanks!

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• using jquery as an alternative to css nth child

  - by JCHASE11

  Hi. I am using the following css to create list items with a chckerboard background ( every other list item has a grey background, which shift every row to create a checkerboard pattern: li:nth-child(8n+2), li:nth-child(8n+4), li:nth-child(8n+5), li:nth-child(8n+7) { background-color:grey; } Is there way I can do this using jquery that is more supportive than css3? Thanks

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• how to aviod infinite loop in observer pattern?

  - by joseph

  Hello. I have only one class with many instances. Every instance is observer of couple of other instances. As well every instance can be observable by couple of another instances. How to avoid infinite loop of calling update() in observers?

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• Clear content of UIScrollView

  - by Joy

  I have an iPhone application that uses a timer and every time it creates some UILabel and places it onto the UISrollview. What i want is to clear the scroll view every time before it puts UILabel onto the ScrollView. So guys please help me to clear the contents of the UIScrollView. I'm just not been able to do that. Looking for your reply

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• Suggest me ,is it a good idea to make changes in default Joomla code structure?

  - by Parth

  Suggest me, is it a good idea to make changes in default Joomla code structure? I need to keep an insert query after every insert/update/delete operation in Joomla administrator code. so that i can track the change i have made. Is it good idea to make the changes every where in the default code in Joomla default structure?

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• DB Designer creates compound primary key

  - by Jon Winstanley

  When adding relationships to a database model in DB Designer 4, a composite primary key is being created every time. So every foreign key I add, I get an extra key added to a composite primary key. I think I must have changed a setting as I don't remember it doing this in the past. Does anyone know how to turn off this feature as I prefer to use a single surrogate primary keys in my database tables?

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• WebService doesn't read web.config

  - by phenevo

  Hi, I've got 3 connectionstrings in web.config, and I used theirs like this: using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SomeName"].ConnectionString)) Every metgod is called by winforms application. One of webmethods doesn't work properly because it reads only one connectionString: data source=.\\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true It's not a connectionString from my web.config . I invoke every method in the same way. How it's impossible ??

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• BlackBerry use of the simulators

  - by user301467

  Hallo, on the BlackBerry homepage you can download different simulators for every different model. There are a lot fo simulators there... My question is, how do you develop BlackBerry applications: do you use the simulators - can you relay on them. If an application works on the simulator, does it works 1:1 on the phone? Do you develop for every model a different UI, as the screensize is different? Thanks you very much for your replay?

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• to stop trigger in jquery

  - by Alexander Corotchi

  Hi everybody , I have an AJAX call, which is doing this call every 5 seconds and when the call "succeed " I have a trigger success: function (msg) { ... $('#test').trigger('click'); return false; }, ... But i need to do this trigger just once , the first time, not every 5 second ! Can somebody suggest me how to stop this trigger, or maybe to use another stuff to trigger this "click " Thanks!

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• How do I get a list of the active IP-addresses, MAC-addresses and NetBIOS names on the LAN?

  - by agnul

  How do I get a list of the active IP-addresses, MAC-addresses and NetBIOS names on the LAN? I'd like to get NetBIOS name, IP and MAC addresses for every host on the LAN, preferably not having to walk to every single PC and take note of the stuff myself. How to do that with Windows Script Host/PowerShell/whatever?

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• Iframe always showing scroll bars in IE7

  - by Martin Bacon

  Hi everyone, Having an annoying issue in IE7. I have a website where, at the bottom of every page theres an Iframe, and for the life of me I cannot get the scroll bars to hide. This is only in IE7, every other browser I have tested is fine. I have scrolling="no" and set overflow:hidden; still not working though. If anyones got anything they could suggest I'd be very greatful http://www.keyscape.co.uk is the site Cheers Martin

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• how do addressing modes work on a physical level?

  - by altvali

  I'm trying to learn this basic thing about processors that should be taught in every CS department of every university. Yet i can't find it on the net (Google doesn't help) and i can't find it in my class materials either. Do you know any good resource on how addressing modes work on a physical level? I'm particularly interested in Intel processors.

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• Auto Encryption of web.config connection string

  - by Klaas Jan

  I want to encrypt the connection string in web.config, the problem is each time a developer changes the connection string in web.config and publishes, it needs to be encrypted every time in the web server. Is there any way that the connection string can encrypted automatically every time someone publishes it? Note :- All of us work on our local machines other than the server. So encryption using local machine key is not an option.

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• Catching typos in scripting languages

  - by Geo

  If your scripting language of choice doesn't have something like Perl's strict mode, how are you catching typos? Are you unit testing everything? Every constructor, every method? Is this the only way to go about it?

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• Oracle Schema Design: Seperate Schema with I/O Overhead?

  - by Guru

  We are designing database schema for a new system based on Oracle 11gR1. We have identified a main schema which would have close to 100 tables, these will be accessed from the front end Java application. We have a requirement to audit the values which got changed in close to 50 tables, this has to be done every row. Which means, it is possible that, for a single row in MYSYS.T1 there might be 50 (or more) rows in MYSYS_AUDIT.T1_AUD table. We might be having old values of every column entry and new values available from T1. DBA gave an observation, advising against this method, because he said, separate schema meant an extra I/O for every operation. Basically AUDIT schema would be used only to do some analyse and enter values (thus SELECT and INSERT). Is it true that, "a separate schema means an extra I/O" ? I could not find justification. It appears logical to me, as the AUDIT data should not be tampered with, so a separate schema. Also, we designed a separate schema for archiving some tables from MYSYS. From MYSYS_ARC the table might be backed up into tapes or deleted after sufficient time. Few stats: Few tables (close to 20, 30) in MYSYS schema could grow to around 50M rows. We have asked for a total disk space of 4 TB. MYSYS_AUDIT schema might be having 10 times that of MYSYS but we wont keep them more than 3 months. Questions Given all these, can you suggest me any improvements? Separate schema affects disc I/O? (one extra I/O for every schema ?) Any general suggestions? Figure: +-------------------+ +-------------------+ | MYSYS | | MYSYS_AUDIT | | | | | | 1. T1 | | 1. T1_AUD | | 2. T2 | | 2. T2_AUD | | 3. T3 |--------->| 3. T3_AUD | | 4. T4 |(SELECT, | 4. T4_AUD | | . | INSERT) | . | | . | | . | | . | | . | | 100. T100 | | 50. T50_AUD | +-------------------+ +-------------------+ | | | | |(INSERT) | | | * +-------------------+ | MYSYS_ARC | | | | 1. T1_ARC | | 2. T2_ARC | | 3. T3_ARC | | 4. T4_ARC | | . | | . | | . | | 100. T100_ARC | +-------------------+ Apart from this, we have two more schemas with only read only rights, but mainly they are for adhoc purpose and we dont mind the performance on them.

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• BindException/Too many file open while using HttpClient under load

  - by Langali

  I have got 1000 dedicated Java threads where each thread polls a corresponding url every one second. public class Poller { public static Node poll(Node node) { GetMethod method = null; try { HttpClient client = new HttpClient(new SimpleHttpConnectionManager(true)); ...... } catch (IOException ex) { ex.printStackTrace(); } finally { method.releaseConnection(); } } } The threads are run every one second: for (int i=0; i <1000; i++) { MyThread thread = threads.get(i) // threads is a static field if(thread.isAlive()) { // If the previous thread is still running, let it run. } else { thread.start(); } } The problem is if I run the job every one second I get random exceptions like these: java.net.BindException: Address already in use INFO httpclient.HttpMethodDirector: I/O exception (java.net.BindException) caught when processing request: Address already in use INFO httpclient.HttpMethodDirector: Retrying request But if I run the job every 2 seconds or more, everything runs fine. I even tried shutting down the instance of SimpleHttpConnectionManager() using shutDown() with no effect. If I do netstat, I see thousands of TCP connections in TIME_WAIT state, which means they are have been closed and are clearing up. So to limit the no of connections, I tried using a single instance of HttpClient and use it like this: public class MyHttpClientFactory { private static MyHttpClientFactory instance = new HttpClientFactory(); private MultiThreadedHttpConnectionManager connectionManager; private HttpClient client; private HttpClientFactory() { init(); } public static HttpClientFactory getInstance() { return instance; } public void init() { connectionManager = new MultiThreadedHttpConnectionManager(); HttpConnectionManagerParams managerParams = new HttpConnectionManagerParams(); managerParams.setMaxTotalConnections(1000); connectionManager.setParams(managerParams); client = new HttpClient(connectionManager); } public HttpClient getHttpClient() { if (client != null) { return client; } else { init(); return client; } } } However after running for exactly 2 hours, it starts throwing 'too many open files' and eventually cannot do anything at all. ERROR java.net.SocketException: Too many open files INFO httpclient.HttpMethodDirector: I/O exception (java.net.SocketException) caught when processing request: Too many open files INFO httpclient.HttpMethodDirector: Retrying request I should be able to increase the no of connections allowed and make it work, but I would just be prolonging the evil. Any idea what is the best practise to use HttpClient in a situation like above? Btw, I am still on HttpClient3.1.

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• Replacing a specific bit of text in all php files on a server?

  - by meds

  So I just got my sorry ass hacked, the hack put some obscure string in almost every one of the php files on my website. How can I remove every instance that line occurs? The code it added started with

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• log4j properties file: how to configure ?

  - by EugeneP

  Is it right that the procedure of using log4j looks like this: 1) put a .properties file somewhere in a project folder 2) in an initialization method, that runs only once, invoke PropertyConfigurator.configure("path_to_file"); 3) in every method we need to use logger we define a static logger variable and simply invoke getLogger(class) I'm asking you this: what if the initialization module is not defined? Where to put "log4j.properties" file so that we wouldn't need to invoke propertyconfigurator.configure at all, or if it's not possible, is it ok to invoke PropertyConfigurator.configure("path_to_file") in every method that uses a logger?

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• iphone ios4 is not working

  - by asad26

  hi every one i am iphone developer as standard registered, i installed SDK4 seed version is fine and i alos instal ios4 for my ipod touch that is register in apple for development use, so i used xcode organizer to update my ipodtouch to new ios4 every this was fine and working to upload data , but in middle is crash and didn't work , now my ipod touch is dead is not working at all and i try to restore my ipad from backup i have in itune it didn't work? so any one has solution for my problem for installing ios4 in my ipodtouch ? thanks

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