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  • Buffering db inserts in multithreaded program

    - by Winter
    I have a system which breaks a large taks into small tasks using about 30 threads as a time. As each individual thread finishes it persists its calculated results to the database. What I want to achieve is to have each thread pass its results to a new persisance class that will perform a type of double buffering and data persistance while running in its own thread. For example, after 100 threads have moved their data to the buffer the persistance class then the persistance class swaps the buffers and persists all 100 entries to the database. This would allow utilization of prepared statements and thus cut way down on the I/O between the program and the database. Is there a pattern or good example of this type of multithreading double buffering?

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  • How to prepare for an interview for Ruby on Rails?

    - by Snehal
    Background about myself: I have about 3 years experience working in Java/J2EE. I am currently pursuing MS in Software Engineering at a reputed university. I have done several classwork projects on Ruby on Rails and can be considered at Intermediate level expertise with ROR. I have an interview coming up next week for a Ruby on Rails developer position at a startup. I have already prepared all the basics of Ruby on Rails but didn't get a lot input on the questions asked for ROR developers. Can you guys help me with the preparation? Any materials, suggestions would be welcome.

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  • Passing class names or objects?

    - by nischayn22
    I have a switch statement switch ( $id ) { case 'abc': return 'Animal'; case 'xyz': return 'Human'; //many more } I am returning class names,and use them to call some of their static functions using call_user_func(). Instead I can also create a object of that class, return that and then call the static function from that object as $object::method($param) switch ( $id ) { case 'abc': return new Animal; case 'xyz': return new Human; //many more } Which way is efficient? To make this question broader : I have classes that have mostly all static methods right now, putting them into classes is kind of a grouping idea here (for example the DB table structure of Animal is given by class Animal and so for Human class). I need to access many functions from these classes so the switch needs to give me access to the class

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  • java.lang.OutOfMemoryError: Java heap space

    - by houlahan
    i get this error when calling a mysql Prepared Statement every 30 seconds this is the code which is been called: public static int getUserConnectedatId(Connection conn, int i) throws SQLException { pstmt = conn.prepareStatement("SELECT UserId from connection where ConnectionId ='" + i + "'"); ResultSet rs = pstmt.executeQuery(); int id = -1; if (rs.next()) { id = rs.getInt(1); } pstmt = null; rs = null; return id; } not sure what the problem is :s thanks in advanced.

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  • Cocoa multhithreads, locks don't work

    - by Igor
    I have a threadMethod which shows in console robotMotorsStatus every 0.5 sec. But when I try to change robotMotorsStatus in changeRobotStatus method I receive an exception. Where I need to put locks in that program. #import "AppController.h" @implementation AppController extern char *robotMotorsStatus; - (IBAction)runThread:(id)sender { [self performSelectorInBackground:@selector(threadMethod) withObject:nil]; } - (void)threadMethod { char string_to_send[]="QFF001100\r"; //String prepared to the port sending (first inintialization) string_to_send[7] = robotMotorsStatus[0]; string_to_send[8] = robotMotorsStatus[1]; while(1){ [theLock lock]; usleep(500000); NSLog (@"Robot status %s", robotMotorsStatus); [theLock unlock]; } } - (IBAction)changeRobotStatus:(id)sender { robotMotorsStatus[0]='1'; }

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  • Where would you start if you were trying to solve this PDF classification problem?

    - by burtonic
    We are crawling and downloading lots of companies' PDFs and trying to pick out the ones that are Annual Reports. Such reports can be downloaded from most companies' investor-relations pages. The PDFs are scanned and the database is populated with, among other things, the: Title Contents (full text) Page count Word count Orientation First line Using this data we are checking for the obvious phrases such as: Annual report Financial statement Quarterly report Interim report Then recording the frequency of these phrases and others. So far we have around 350,000 PDFs to scan and a training set of 4,000 documents that have been manually classified as either a report or not. We are experimenting with a number of different approaches including Bayesian classifiers and weighting the different factors available. We are building the classifier in Ruby. My question is: if you were thinking about this problem, where would you start?

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  • Creating new process with Lua interpreater, failures in passing argumets

    - by user1131997
    I need help with passing arguments in CreateProcess() //Windows I want to: BOOL status = CreateProcess(L"C:\\Program Files (x86)\\Lua\\lua52.exe", NULL, NULL, NULL, FALSE, NULL, NULL, NULL, &si, &pi); But with passing some arguments.... Lua interpreater accepts file with lua-scripts, so I have prepared it and want to do: lua52 C:\1.lua for example... I have the path of some lua-script and want the interpreater of Lua to interpreate it and than get the result of program on Lua from Created process. I have tried in some ways to do it, but no success. Please, help! Thank you!

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  • What traits can hint a teenager he should pursue software development career?

    - by sharptooth
    We're gonna have a day when employees' kids will visit our company office. The idea is that they will come see "how parents work", "how cool stuff is done", have fun, etc. Kids will be up to 17 years old. Now I suppose some of the teenagers already think of what they wanna do when they finally grow up and will ask questions like "how can I tell I should get a degree in software engineering and not in logistics/finances/whatever?" So I think we better be prepared and ready to answer those questions so that those who really fit don't waste time but use their potential to the full. What traits that already emerge in teenage years indicate that a person could become a very good software developer?

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  • Meet and Greet with IDM Executives at Oracle OpenWorld

    - by Tanu Sood
    Oracle’s Identity Management Team Invites You to Learn How to Secure The New Digital Experience Come see how the Oracle Identity Management platform can position your company to take advantage of the emerging business opportunities. Leverage Social Identities for web authentication Enable customers and employees to interact through their mobile devices Deploy Self Service User Provisioning for quick role changes based on business needs We look forward to seeing you there! Wednesday, October 3rd  3:30-4:30 PM  Meeting 4:30-5:30 PM  Cocktail Reception Four Seasons Hotel Yerba Buena Room 757 Market Street San Francisco, CA 94103 415.633.3000 http://www.fourseasons.com/sanfrancisco/   RSVP Now Copyright © 2012, Oracle and/or its affiliates.  All rights reserved. Contact Us | Legal Notices and Terms of Use | Privacy Statement

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  • Apache/2.2.9, mod_perl/2.0.4: status_line doesn't seem to work

    - by Eugene
    Response is prepared this way: my $r = Apache2::RequestUtil->request; $r->status_line('500 Internal Server Error'); $r->send_cgi_header("Content-Type: text/html; charset=UTF-8\n\n"); print 'Custom error message'; Request: GET /test_page HTTP/1.1 Host: www.xxx.xxx Response: HTTP/1.1 200 OK Date: XXXXXXXXXX Server: Apache/xxxxxxxx Vary: Accept-Encoding Transfer-Encoding: chunked Content-Type: text/html; charset=UTF-8 44 Custom error message 0 Why response status is 200 and not 500?

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  • JDBC batch insert performance

    - by wo_shi_ni_ba_ba
    I need to insert a couple hundreds of millions of records into the mysql db. I'm batch inserting it 1 million at a time. Please see my code below. It seems to be slow. Is there any way to optimize it? try { // Disable auto-commit connection.setAutoCommit(false); // Create a prepared statement String sql = "INSERT INTO mytable (xxx), VALUES(?)"; PreparedStatement pstmt = connection.prepareStatement(sql); Object[] vals=set.toArray(); for (int i=0; i

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  • How long can a hash left out in the open be considered safe?

    - by Xeoncross
    If I were to leave a SHA2 family hash out on my website - how long would it be considered safe? How long would I have before I could be sure that someone would find a collision for it and know what was hashed? I know that the amount of time would be based on the computational power of the one seeking to break it. It would also depend on the string length, but I'm curious just how secure hashes are. Since many of us run web-servers we constantly have to be prepared for the day when someone might make it all the way to the database which stores the user hashes. So, move the server security out of the way and then what do you have? This is a slightly theoretical area for many of the people I have talked with, so I would love to actually have some more information about average expectations for cracking.

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  • How to solve this problem without the use of if-else statements?

    - by kira
    I have just started my C++ lecture class. And the teacher has given us the following assignment. Write a program that determines whether a number is even or odd. The logic I would use for the program is. Get input a. Store a % 2 as b. If b is 0, then b is even, else b is odd. The catch though, is that we have to write the program without the use of a if-else statement. I have been thinking on how to approach the problem for the past few hours, but I have no clue what to do. Any hints or suggestions?

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  • New and Improved Patch for FRM-40654 Errors in Purchase Orders and Requisitions

    - by user793044
    Development has modified the code in purchase orders and requisition forms to prevent error FRM-40654 when there are trailing spaces in the tables for most of the fields.  After applying the patch, the form will still display the error but a requery will allow you to save the transaction. For the scenarios not covered in the fix, the FND log will now display the specific field that causes the error.  This an example of the FND log for one document where the note_to_vendor has trailing spaces: Form note_to_vendor oldvalue Database  note_to_vendor newvalue Failed first if statement when comparing fields FRM-40654: Record has been updated. Requery block to see change. This new patch includes the fix in Patch 14204845:"In Oracle Purchasing, leading or trailing spaces in po lines data was resulting in errors".  For more information on FRM-40654 errors see the patching section of Note 1203796.1. Be proactive and apply Patch 14479586:R12.PO.B for 12.1.3 or Patch 14569747 for 11.5.10 now!

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  • Zend Database Adapter - Complex MySQL Query

    - by Sonny
    I have defined a function in my Navigation model that executes a query, and I was wondering if there's a more "Zendy" way of generating/executing the query. The query I'm using was proposed by Bill Karwin on another thread here for setting arbitrary record order. I tried using a prepared statement, but the values in the SIGN() function got quoted. I'm using the PDO adapter for MySQL. /** * */ public function setPosition($parentId, $oldPosition, $newPosition) { $parentId = intval($parentId); $oldPosition = intval($oldPosition); $newPosition = intval($newPosition); $this->getAdapter()->query(" UPDATE `navigation` SET `position` = CASE `position` WHEN $oldPosition THEN $newPosition ELSE `position` + SIGN($oldPosition - $newPosition) END WHERE `parent_id` = $parentId AND `position` BETWEEN LEAST($oldPosition, $newPosition) AND GREATEST($oldPosition, $newPosition) "); return $this; }

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  • Gridview - Conditional Images

    This Gridview sample shows how to, for each row, based on other data within that row, to show a different image. We do this by creating a TemplateField, and putting an ASP.Net Image control within it, called 'Image1'. Then, inside the RowDataBound event of the Gridview, we put code, which first, checks and finds the Image control in that row, and then assigning a different JPG file to the ImageURL property of that image. One other thing here, you'll notice, is that when the criteria is matched, we set the Image control's Visible property to 'True'. That's because, one extra criteria is, that if the Units In Stock is larger than 80, we set the Image control's Visible property to 'False'. Naturally, since we're checking one particular column in the Gridview for this data, we're using a Select Case statement.

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  • Slick PHP based image manager for managing user profile images

    - by franko75
    Hi, I'm just throwing this out there as I'm plodding my way through creating a Member Photo album on a site i'm working on, where they can login and upload their photos to a personal gallery. I want this to be nice and lightweight, but still slick and "modern" with a modal based interface for the user. I'm surprised though that there is seemingly nothing open source out there which fits the bill - I've done a few searches on Google to no avail and can't seem to find anything. Lots of bloated photo galleries out there but nothing looks like it has been developed using more recent technologies. Is anyone aware of anything which might suit what I'm looking for? I'm fully prepared to try and code it myself but I'd be delighted if I didn't have to! Pure laziness you might say, but there's no point reinventing the wheel.

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  • Interview Questions that can be asked on TCP/IP, UDP, Socket Programming ?

    - by Shantanu Gupta
    I am going for an interview day after tomorrow where i will be asked vaious questions related to TCP/IP and UDP. As of now i have prepared theoritical knowledge about it. But now I am looking up for gaining some practicle knowledge related to how it works in a network. What all is going in vaious .NET classes. I want to create a very small application like a chat or something that can make me all these concepts very much clear. Could you please suggest some questions related to TCP/IP that you generally ask or that you might have faced. How communication is going from server to client. Right now I am studying TcpClient, TcpListener and UdpClient Class but I want to implement all of them so as to get aware about its working. Is Chat application a Tcp/IP application ? I would appreciate your help.

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  • Including Libraries C++

    - by m00st
    How do I properly include libraries in C++? I'm used to doing the standard libraries in C++ and my own .h files. I'm trying to include wxWidgets or GTK+ in code::blocks and/or netbeans C/C++ plugin. I've included ALL libraries but I constantly get errors such as file not found when it is explicitly in the include! One error: test1.cpp:1:24: wx/msw/wx.rc: No such file or directory : Yes the .h file library is included; what am I missing? Do I need to be importing other things as well? Is there a tutorial for this? Obviously my shoddy textbook hasn't prepared me for this.

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  • How to identify a PDF classification problem?

    - by burtonic
    We are crawling and downloading lots of companies' PDFs and trying to pick out the ones that are Annual Reports. Such reports can be downloaded from most companies' investor-relations pages. The PDFs are scanned and the database is populated with, among other things, the: Title Contents (full text) Page count Word count Orientation First line Using this data we are checking for the obvious phrases such as: Annual report Financial statement Quarterly report Interim report Then recording the frequency of these phrases and others. So far we have around 350,000 PDFs to scan and a training set of 4,000 documents that have been manually classified as either a report or not. We are experimenting with a number of different approaches including Bayesian classifiers and weighting the different factors available. We are building the classifier in Ruby. My question is: if you were thinking about this problem, where would you start?

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  • Upgrading Ubuntu to 12.04 stuck

    - by Chris Britt
    While upgrading from 11.10 to 12.04, I'm stalled at the step: Installing new version of config file /etc/init/udevtrigger.conf The Terminal in the Distribution Upgrade window is expanded, there is no prompt for user input. I've hit enter a few times but it doesn't change anything but add a blank line after the last print statement. It's been sitting for ~6 hours at this stage. No other windows or dialog boxes are open. The upgrade has progressed through "Preparing to Upgrade", "Setting new software channels", and "Getting new packages". Under the progress bar (which estimates 1 day 2 hours remaining, and has for some time), it says Preparing to configure libpcap0.8. I'd take a screen-shot, but it won't let me save the file anywhere. The progress bar is about 1/3 complete.

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  • What database to use with Ruby on Rails, based on actual Hosting services ?

    - by IHawk
    Hello ! I've been looking for hosting services and I still don't know what kind of database is the most commom. It seems to be MySql and PostgreSql. So, I'm not sure about how much traffic and data my website will have (it's just a project), but I would like to be prepared. I've worked in some projects with Oracle (PL/SQL) and I know something from MySql. Based in this facts, What database to use with Ruby on Rails, based on actual Hosting services ? Thank you !

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  • What is the most elegant way to deal with sourced files that themselves source (relative) source fil

    - by René Nyffenegger
    I am editing a file like /path/to/file.txt with vim, hence the current directory is /path/to. Now, I have a directory /other/path/to/vim/files that contains sourceA.vim. Also, there is a sourceB.vim file in /other/path/to/vim/files/lib/sourceB.vim In sourceA.vim, I want to source sourceB.vim, so I put a so lib/sourceB.vim into it. Now, in my file.txt, I do a :so /other/path/to/vim/files/sourceA.vim which fails, because the sourcing system is obviously not prepared for relative path names along with sourcing from another directory. In order to fix this, I put a execute "so " . expand("<sfile>:p:h") . "/lib/sourceB.vim" into sourceA.vim which does what I want. However, I find the solution a bit clumsy and was wondering if there is a more elegant solution to it. I cannot put the sourceA.vim nor sourceB.vim into vim's plugin folder.

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  • Function argument treated as undeclared

    - by Mikulas Dite
    I've prepared this simple example which is not working for me #include <stdio.h> #include <stdlib.h> FILE *fp; char filename[] = "damy.txt"; void echo (char[] text) { fp = fopen(filename, "a"); fwrite(text, 1, strlen(text), fp); fclose(fp); printf(text); } int main () { echo("foo bar"); return 0; } It's supposed to write both to command window and to file. However, this gives compilation error - the text used in echo() is not declared. Does c need another declaration of the variable?

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  • Logic - Time measurement

    - by user73384
    To measure the following for tasks- Last execution time and maximum execution time for each task. CPU load/time consumed by each task over a defined period informed by application at run time. Maximum CPU load consumed by each task. Tasks have following characteristics- First task runs as background – Event information for entering only Second task - periodic – Event information for entering and exiting from task Third task is interrupt , can start any time – no information available from this task Forth task highest priority interrupt , can start any time – Event information for entering and exiting from task Should use least possible execution time and memory. 32bit increment timer available for time counting. Lets prepare and discuss the logic, It’s OK to have limitations …! Questions on understanding problem statement are welcome

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