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• Import text file crunching library for Java/Groovy ?

  - by devdude

  In a lot of real life implementations of applications we face the requirement to import some kind of (text) files. Usually we would implement some (hardcoded?) logic to validate the file (eg. proper header, proper number of delimiters, proper date/time value,etc.). Eventually also need to check for the existence of related data in a table (eg. value of field 1 in text file must have an entry in some basic data table). While XML solves this (to some extend) with XSD and DTD, we end up hacking this again and again for proprietary text file formats. Is there any library or framework that allows the creation of templates similar to the xsd approach ? This would make it way more flexible to react on file format changes or implement new formats. Thanks for any hints Sven

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• perl order of opendir return results?

  - by ojblass

  opendir MYDIR, "$dir"; my @FILES = readdir MYDIR; closedir MYDIR; It appears that 99.9 % of the time the first two entries in the array are always “.” and “..”. Later logic in the script has issues if it is not true. I ran into a case where the directory entries appeared later. Is this indicative of the file system being corrupt or something else? Is there a known order to what opendir returns?

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• How do I initialize attributes when I instantiate objects in Rails?

  - by nfm

  Clients have many Invoices. Invoices have a number attribute that I want to initialize by incrementing the client's previous invoice number. For example: @client = Client.find(1) @client.last_invoice_number > 14 @invoice = @client.invoices.build @invoice.number > 15 I want to get this functionality into my Invoice model, but I'm not sure how to. Here's what I'm imagining the code to be like: class Invoice < ActiveRecord::Base ... def initialize(attributes = {}) client = Client.find(attributes[:client_id]) attributes[:number] = client.last_invoice_number + 1 client.update_attributes(:last_invoice_number => client.last_invoice_number + 1) end end However, attributes[:client_id] isn't set when I call @client.invoices.build. How and when is the invoice's client_id initialized, and when can I use it to initialize the invoice's number? Can I get this logic into the model, or will I have to put it in the controller?

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• Editing Multiple files in vi with Wildcards

  - by Alan Storm

  When using the programmers text editor vi, I'll often using a wildcard search to be lazy about the file I want to edit vi ThisIsAReallLongFi*.txt When this matches a single file it works great. However, if it matches multiple files vi does something weird. First, it opens the first file for editing Second, when I :wq out of the file, I get a message the bottom of the terminal that looks like this E173: 4 more files to edit Hit ENTER or type command to continue When I hit enter, it returns me to edit mode in the file I was just in. The behavior I'd expect here would be that vi would move on to the next file to edit. So, What's the logic behind vi's behavior here Is there a way to move on and edit the next file that's been matched? And yes, I know about tab completion, this question is based on curiosity and wanting to understand the shell better.

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• How to set the content of the $script_for_layout in cakephp?

  - by sipiatti

  Hi, I am learning cakephp in an autodidact manner and I am a complete newbie :) I am creating a simple application. Some logic work so now I going to dive into designing views and layouts. I read the docs and the tutorial but I could not find where to set the content of $script_for_layout. Especially I want to set a $html-css to create link in pages to the stylesheet. I found out that I could do it in directly in the layout template but I would like to create the same link in all pages/views/layouts to the stylesheet so I hope there is a simple way, and avoid to do this in all layouts and/or controllers

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• Delete all but 5 newest entries in MySQL table

  - by manyxcxi

  I currently have PHP code that handles the logic for this because I do not know how to handle it in SQL. I want to create a stored procedure that will select all the elements in a table for a given run_id and delete all of them except for the 'newest' 5 entries (as noted by the stop_time column). CREATE TABLE `TAA`.`RunHistory` ( `id` int(11) NOT NULL auto_increment, `start_time` datetime default NULL, `stop_time` datetime default NULL, `success_lines` int(11) default NULL, `error_lines` int(11) default NULL, `config_id` int(11) NOT NULL, `file_id` int(11) NOT NULL, `notes` text NOT NULL, `log_file` longblob, `save` tinyint(1) NOT NULL default '0', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=128 DEFAULT CHARSET=utf8;

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• mysql: select ... where id = any value. is it possible?

  - by Syom

  look at this table please table |id| |name| |order| i must get the rows, where name = something and order = somevalue so i write select `id` from `table` where `name` = 'something' and `order` = 'somevalue' but depend on php logic, sometimes i need to get all rows, where name = somethimg, independently of order value. i don't want to change the query structure, because in practise there are many number of fields, and possible count of queries will became very big. so i want to save the structure of query, and when i need to select just by name, i want to write something like this select `id` from `table` where `name` = 'something' and `order` = any value is it possible? maybe the question is incomprehensible, at least i tried;) sorry for bad english thanks

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• In the java DBCP connection pool - what is an idle connection?

  - by Ravenor

  A colleague at work insists that a DBCP idle connection is a connection that has lain unused for 30 minutes. I believe a dbcp idle connection is a connection that is in the pool available to be borrowed, and an active connection is one that is borrowed. Looking through the code I found no reference to 30 minutes or other magic values and a cursory glance through the code for assuring minidle does not show any such logic. If he is correct can you please back that up with a code or documentation reference. For the complete answer I would like it answered for both DBCP 1.1 and 1.6.

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• Including tax in total sale price.

  - by Frank Computer

  INFORMIX-SQL 7.3 Perform Screen: Suppose I have a customer who wants to pay a $100 (7% tax included), what logic can I use so that when the cashier clerk enters $100 in the tax included sale amount, it will calculate the sale price and tax so that it adds up to $100. I have the folllowing 3 field tags in my perform screen: sprice = transaction.sale_price; stax = transaction.sale_tax; stotal = transaction.sale_total; after editadd of transaction.sale_price ? ? ?

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• Parameter passing Vs Table Valued Parameters Vs XML to SQL 2008 from .Net Application

  - by Harryboy

  As We are working on a asp .net project there three ways one can update data into database when there are multiple rows updation / insertion required Let's assume we need to update employee education detail (which could be 1,3,5 or 10 records) Method to Update Data Pass value as parameter (Traditional approach), If 10 records are there then 10 round trip required Pass data as xml and write logic inside your stored procedure to get that data from xml and update the table (only single roundtrip required) Use Table valued parameters (only single roundtrip required) Note : Data is available as List, so i need to convert it to xml or any other format if i need to pass. There are no. of places in entire application we need to update data in bulk (or multiple records) I just need your suggestions that Which method will be faster (please mention if there are some other overheads) Manageability or testability concern with any approach Any other bottleneck or issue with any of the approach (Serialization /Deserialization concern or limit on size of the data passing) Any other method you suggest for same operations Thanks

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• usedefaultcredentials in order to call DirectoryEntry

  - by Copeleto

  Hi, I am working in a Login page and teh logic is like - try { DirectoryEntry LDAPLogin = new DirectoryEntry(ConfigurationSettings.AppSettings ["LDAPPath"].ToString(), Usuario, Txt_Contrasenia.Text.ToString()); if (LDAPLogin.NativeGuid != LDAPLogin.Name) ValidarGrupo(); } catch (Exception exc) { Label_Info.Text = "Sus credenciales no son validas: " + Usuario.ToString() + " " + exc.Message; } If the user enters the rights credentials I call a method ValidarGrupo that implements a lookup in the AD for a group of the user I woould like to replace the username and password with UseDefaultCredentials in order to avoid that the user has to enter the username and password and the Login pages use the credentials of the user that is login on the machine.

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• Override Java System.currentTimeMillis

  - by Mike Clark

  Is there a way, either in code or with JVM arguments, to override the current time, as presented via System.currentTimeMillis, other than manually changing the system clock on the host machine? A little background: We have a system that runs a number of accounting jobs that revolve much of their logic around the current date (ie 1st of the month, 1st of the year, etc) Unfortunately, a lot of the legacy code calls functions such as new Date() or Calendar.getInstance(), both of which eventually call down to System.currentTimeMillis. For testing purposes, right now, we are stuck with manually updating the system clock to manipulate what time and date the code thinks that the test is being run. So my question is: Is there a way to override what is returned by System.currentTimeMillis? For example, to tell the JVM to automatically add or subtract some offset before returning from that method? Thanks in advance!

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• Identifying PHP unused variables (in Emacs)?

  - by Roberto Aloi

  Is it somehow possible to identify unused variables in a PHP file in Emacs? With other languages, this is possible by using tools such as flymake. I've already enabled Flymake to show syntax errors for my PHP files on the fly, but still it's frustrating that PHP logic errors are sometimes due to situations like: <?php $foo = whatever(); $bar = something($fo); ... Note the typo on $foo that will contribute to the developer's headache and to his exorbitant use of coffee.

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• Does the compiler provides extra stack space for byte-spilling?

  - by xuwicha

  From the sample code below which I got here, I don't understand why the value of registers are move to specific part in stack when byte-spilling is performed. pushq %rbp movq %rsp, %rbp subq $96, %rsp leaq L__unnamed_cfstring_23(%rip), %rax leaq L__unnamed_cfstring_26(%rip), %rcx movl $42, %edx leaq l_objc_msgSend_fixup_alloc(%rip), %r8 movl $0, -4(%rbp) movl %edi, -8(%rbp) movq %rsi, -16(%rbp) movq %rax, -48(%rbp) ## 8-byte Spill movq %rcx, -56(%rbp) ## 8-byte Spill movq %r8, -64(%rbp) ## 8-byte Spill movl %edx, -68(%rbp) ## 4-byte Spill callq _objc_autoreleasePoolPush movq L_OBJC_CLASSLIST_REFERENCES_$_(%rip), %rcx movq %rcx, %rdi movq -64(%rbp), %rsi ## 8-byte Reload movq %rax, -80(%rbp) ## 8-byte Spill callq *l_objc_msgSend_fixup_alloc(%rip) movq L_OBJC_SELECTOR_REFERENCES_27(%rip), %rsi movq %rax, %rdi movq -56(%rbp), %rdx ## 8-byte Reload movl -68(%rbp), %ecx ## 4-byte Reload And also, I don't know what is the purpose of byte-spilling since the program logic can still be achieved if the function is the one saving the value of the registers it will be used inside it. I really have no idea why is this happening. Please help me understand this.

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• Wpf stop routing event when MessageBox appear?

  - by yossharel

  Hi all, I've PreviewMouseDown event on TreeView in order to determine if user can select other item based on some logic. If the current item data changed, will appear MessageBox that asks the user if he want to discard the changes. if user press YES , I set e.Handled = false; to enable the new selection. and if user press NO, I set e.Handled = true; to cancel the new selection. The problem is that although I set e.Handled = false , the event stop and no selection event occurs on TreeView. Someone has solution for that? Thanks in advance!

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• net c# lock statement in data access layer

  - by Pedro Rivera

  I saw a code where they have the data access layer like this: public class CustomerDA{ private static readonly object _sync = new object(); private static readonly CustomerDA _mutex = new CustomerDA(); private CustomerDA(){ } public CustomerDA GetInstance(){ lock(_sync){ return _mutex; } } public DataSet GetCustomers(){ //database SELECT //return a DataSet } public int UpdateCustomer(some parameters){ //update some user } } public class CustomerBO{ public DataSet GetCustomers(){ //some bussiness logic return CustomerDA.GetInstance().GetCustomers(); } } I was using it, but start thinking... "and what if had to build a facebook like application where there are hundreds of thousands of concurrent users? would I be blocking each user from doing his things until the previous user ends his database stuff? and for the Update method, is it useful to LOCK THREADS in the app when database engines already manage concurrency at database server level?" Then I started to think about moving the lock to the GetCustomers and UpdateCustomer methods, but think again: "is it useful at all?"

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• django: how to interconnect various logical pieces of a webpage

  - by facha

  Hi, everyone. I'm just starting with django, so sorry for a possibly stupid question. Imagine, I have a webpage with 3 logical pieces: content, dynamic menu, banners. It seems ok to me to have a template with something like: {% include "banners.html" %} {% include "menu.html" %} {% include "content.html" %} But then, how do I do it? Every piece has its separate logic in a separate view in its' separate app. How do I trigger execution of all three views and render all three templates? P.S. Is there a sourceforge-like site for django apps where I could take a look at how people are doing stuff in real projects?

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• EJB3.1 Remote invocation - is it distributed automatically? is it expensive?

  - by Hank

  I'm building a JEE6 application with performance and scalability in the forefront of my mind. Business logic and JPA2-facade is held in stateless session beans (EJB3.1). As of right now, the SLSBs implement only @Remote-interfaces. When a bean needs to access another bean, it does so via RMI. My reasoning behind this is the assumption that, once the application runs on a bunch of clustered application servers, the RMI-part allows the execution to be distributed across the whole cluster automagically. Is that a correct assumption? I'm fine with dealing with the downsides of that (objects lose entityManager session, pass-by-value), at least I think so. But I am wondering if constant remote invocation isn't adding more load then necessary.

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• Calling a WCF from ASP.NET with same the single-signon user LogonUserIdentity

  - by Dennis Cheung

  I have a ASP.NET MVC page, which call WCF logic. The system is single-signon using NTML. Both the ASP page and the WCF will use the UserIdentity to get user login information. Other then NTML, I will also have a Form based authorization (with AD) in same system. The ASP page, is it simple and I can have it from HttpContext.Current.Request.LogonUserIdentity. However, it seem it is missing from the WCF which call by the ASP, not from browser. How to configure to pass the ID pass from the ASP to the WCF?

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• Is Pex (Test generation) really usefull tool?

  - by Yauheni Sivukha

  Yes, it is possible to generate tests on boundary values for functions like "Sum" or "Divide". Pex is a good tool here. But more often we create tests on business behaviour. Let's consider example from classic Beck's tdd book: [Test] public void ShouldRoundOnCreation() { Money money = new Money(20.678); Assert.AreEqual(20.68,money.Amount); Assert.AreEqual(2068,money.Cents); } Can this test be generated? No :) 95 % of tests in my projects check business logic, and can not be generated. Pex (Especially in pair with Moles) can give 100% code coverage, but a high code coverage rate of a test suite does never indicate, that code is well tested - It only gives false confidence that everything is tested. And this is very dangerous. So, the question is - Is Pex really usefull tool?

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• How are dll's loaded by the CLR?

  - by priehl

  My assumption was always that the CLR loaded all of the dlls it needed on startup of the app domain. However, I've written an example that makes me question this assumption. I start up my application and check to see how many modules are loaded. Process[] ObjModulesList; ProcessModuleCollection ObjModulesOrig; //Get all modules inside the process ObjModulesList = Process.GetProcessesByName("MyProcessName"); // Populate the module collection. ObjModulesOrig = ObjModulesList[0].Modules; Console.WriteLine(ObjModulesOrig.Count.ToString()); I then repeate the exact same code and my count is different. The additional dll is C:\WINNT\system32\version.dll. I'm really confused as to why the counts would be different. Could someone please elaborate on what the clr is doing and how it's loading these thing, and by what logic it's doing so?

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• Magento setPath for category

  - by Alan Whitelaw

  I am using PHP to set up my categories in Magento 1.4.2 $categories[] = array('id' => '23', 'path' => '16'); $categories[] = array('id' => '24', 'path' => '16/23'); $categories[] = array('id' => '25', 'path' => '16/23/24'); foreach ($categories as $category) { $current_category = Mage::getModel('catalog/category') ->load($category['id']) ->setPath('1/2/'.$category['path']) ->save(); } However something has gone wrong The categories have been imported like this: root -23 -16 --24 and 25 is nowhere to be seen Have I got something wrong with my logic or how to use Mage::getModel('catalog/category') and ->setPath

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• Why acegi (Spring Security) converts password to uppercase before comparing ?

  - by Tony

  One of my colleague in QA team reported a bug to me, the bug said that can't change password to lowercase, otherwise login is rejected,using number or uppercase is all fine. The login system was implemented using acegi 1.0 (now called Spring Security). This was a very strange bug,changing password is done by encrypting the user input string into MD5 string, I implemented this without using anything related acegi, I don't if the is the origin cause of the problem. When the login is rejected, through debugging, I find that, the user input is converted into uppercase by acegi when passing to the acegi comparing logic. At first, I didn't believe this, when I checkout the acegi source and debugging with it, I find it does convert both username and password to uppercase (source code line 121), Can you tell me why it does this? This can cause password encoding mismatch!

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• Surface Detection in 2d Game?

  - by GamiShini

  I'm working on a 2D Platform game, and I was wondering what's the best (performance-wise) way to implement Surface (Collision) Detection. So far I'm thinking of constructing a list of level objects constructed of a list of lines, and I draw tiles along the lines. ( http://img375.imageshack.us/img375/1704/lines.png ). I'm thinking every object holds the ID of the surface that he walks on, in order to easily manipulate his y position while walking up/downhill. Something like this: //Player/MovableObject class MoveLeft() { this.Position.Y = Helper.GetSurfaceById(this.SurfaceId).GetYWhenXIs(this.Position.X) } So the logic I use to detect "droping/walking on surface" is a simple point (player's lower legs)-touches-line (surface) check (with some safety approximation - let`s say 1-2 pixels over the line). Is this approach OK? I`ve been having difficulty trying to find reading material for this problem, so feel free to drop links/advice.

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• jQuery Validate - Require at least one from group, plus additional items.

  - by Kevin Pullin

  I'm attempting to use 'jQuery Validate' on a form that requires an email address plus either all items of a shipping address completed or none at all. Using the sample provided by the solution to this question: jQuery Validate - “Either skip these fields, or fill at least X of them”, I have been able to successfully solve the validation of the address group. The problem, however, is that the logic for validating the email address field does not work. From debugging the Validate scripts, the "re-entrant" validation code triggered by calling 'fields.data('being_validated', true).valid();' in the linked example results in a reset of all previously validated errors (i.e. the email validation error is cleared). I have modified some existing samples, the first in which removes the offending line and the second with it included. Email Validation Working Email Validation Fails Any tips or suggestions on how to properly solve this or work around the failure?

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