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  • C# - Why can't I enforce derived classes to have parameterless constructors?

    - by FrisbeeBen
    I am trying to do the following: public class foo<T> where T : bar, new { _t = new T(); private T _t; } public abstract class bar { public abstract void someMethod(); // Some implementation } public class baz : bar { public overide someMethod(){//Implementation} } And I am attempting to use it as follows: foo<baz> fooObject = new foo<baz>(); And I get an error explaining that 'T' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method. I fully understand why this must be, and also understand that I could pass a pre-initialized object of type 'T' in as a constructor argument to avoid having to 'new' it, but is there any way around this? any way to enforce classes that derive from 'bar' to supply parameterless constructors?

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  • Why are Java primitive types' modifiers `public`, `abstract`, & `final`?

    - by oconnor0
    In the process of doing some reflection on Java types, I came across an oddity that I do not understand. Inspecting int for its modifiers returns public, abstract, and final. I understand public and final, but the presence of abstract on a primitive type is non-obvious to me. Why is this the case? Edit: I am not reflecting on Integer but on int: import java.lang.reflect.Modifier; public class IntegerReflection { public static void main(final String[] args) { System.out.println(String.format("int.class == Integer.class -> %b", int.class == Integer.class)); System.out.println(String.format("int.class modifiers: %s", Modifier.toString(int.class.getModifiers()))); System.out.println(String.format("Integer.class modifiers: %s", Modifier.toString(Integer.class.getModifiers()))); } } The output when run: int.class == Integer.class -> false int.class modifiers: public abstract final Integer.class modifiers: public final

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  • How to map inheritance with property returned other inheritance?

    - by dario-g
    Hi I have abstract class Vehicle and two classes that derive from: Car and ForkLift. public abstract class Vehicle { public EngineBase Engine { get; set; } } public class Car : Vehicle { public GasEngine Engine { get; set; } } public class ForkLift : Vehicle { public ElectricEngine Engine { get; set; } } and Engine clasess: public abstract class Engine { } public class GasEngine : Engine { } public class ElectricEngine : Engine { } Engines are mapped with "table per class hierarchy". With Vehicles I want to use the same pattern. How to map Engine class and derived with that Engine property?

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  • Why can't I enforce derived classes to have parameterless constructors?

    - by FrisbeeBen
    I am trying to do the following: public class foo<T> where T : bar, new() { public foo() { _t = new T(); } private T _t; } public abstract class bar { public abstract void someMethod(); // Some implementation } public class baz : bar { public overide someMethod(){//Implementation} } And I am attempting to use it as follows: foo<baz> fooObject = new foo<baz>(); And I get an error explaining that 'T' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method. I fully understand why this must be, and also understand that I could pass a pre-initialized object of type 'T' in as a constructor argument to avoid having to 'new' it, but is there any way around this? any way to enforce classes that derive from 'bar' to supply parameterless constructors?

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  • Spring MVC managing multiple views with single controller

    - by Sudhir
    I am trying to implement order management module. There are different order types (approximately about 15). Each order has a seperate view. But the actions performed on UI are same irrespective of order type. Below is the structure of my DTO abstract class Order abstract class SecurityOrder extends Order abstract class TermDepositOrder extends Order ..... ..... ..... I am trying to implement a single controller capable of managing all views. Something similar to the one below: @Controller public class OrderController<F extends Order> { public F validate(F order) { } public F insert(F order) { } } I am not sure how spring mvc would be able to map request parameters properly to the order instance as it doesn't know which order instance to populate. Is it possible to achieve this with single controller or should I go with a controller for each order type and duplicate same code across all controllers?

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  • Java: Best approach to have a long list of variables needed all the time without consuming memory?

    - by evilReiko
    I wrote an abstract class to contain all rules of the application because I need them almost everywhere in my application. So most of what it contains is static final variables, something like this: public abstract class appRules { public static final boolean IS_DEV = true; public static final String CLOCK_SHORT_TIME_FORMAT = "something"; public static final String CLOCK_SHORT_DATE_FORMAT = "something else"; public static final String CLOCK_FULL_FORMAT = "other thing"; public static final int USERNAME_MIN = 5; public static final int USERNAME_MAX = 16; // etc. } The class is big and contains LOTS of such variables. My Question: Isn't setting static variables means these variables are floating in memory all the time? Do you suggest insteading of having an abstract class, I have a instantiable class with non-static variables (just public final), so I instantiate the class and use the variables only when I need them. Or is what am I doing is completely wrong approach and you suggest something else?

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  • Why javabeans framework create the IndexedPropertyDescriptor for the NON index method

    - by George Macus
    I'm not familiar with java beans framework, in the below scenario, I got the IndexedPropertyDescriptor for the method getFooWithX, could someone explain why? public class IntrospectorTest { public static void main(String[] args) throws IntrospectionException { BeanInfo info = Introspector.getBeanInfo(SubClass.class); PropertyDescriptor[] descriptors = info.getPropertyDescriptors(); for (int i = 0; i < descriptors.length; i++) { System.out.println(descriptors[i].getClass().getName() + ":" + descriptors[i].getName()); } } } abstract class BaseClass { public abstract Object getFoo(); } abstract class SubClass extends BaseClass { public Object getFooWithX(int x) { return null; } } and the result will be: java.beans.PropertyDescriptor:class java.beans.PropertyDescriptor:foo java.beans.IndexedPropertyDescriptor:fooWithX Why?

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  • How can I use GPRename's regex feature to reinsert the matched-group into the 'replace'?

    - by David Thomas
    I've been using GPRename to batch-rename files; this is rather more efficient than individually correcting each file, but still seems to be less efficient than it might be, primarily because either I don't understand the regex syntax used, or because the regex implementation is incomplete1 Given a list of files of the following syntax: (01) - title of file1.avi (02) - title of file2.avi (03) - title of file3.avi I attempted to use the 'replace' (with the regex option selected, the case-sensitive option deselected): (\(\d{2}\)) The preview then shows (given that I've specified no 'replace with' option as yet): title of file1.avi title of file2.avi title of file3.avi Which is great, clearly the regex is identifying the correct group (the (01)). Now, what I was hoping to do (using the JavaScript syntax) in the 'replace with' option is use: $1 (I also tried using '$1', \1 and '\1') This was just to check that I could access the matched group, and it seems I can't, the matched group is, as I suppose might be expected, replaced with the literal replacement string. So, my question: is it possible to match a particular group of characters, in this case the numbers within the brackets, and then insert those into the replacement string? Therefore: (01) title of file1.avi (02) title of file2.avi (03) title of file3.avi Becomes: 01 title of file1.avi 02 title of file2.avi 03 title of file3.avi I absolutely suspect the former, personally.

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  • One Exception to Aggregate Them All

    - by João Angelo
    .NET 4.0 introduced a new type of exception, the AggregateException which as the name implies allows to aggregate several exceptions inside a single throw-able exception instance. It is extensively used in the Task Parallel Library (TPL) and besides representing a simple collection of exceptions can also be used to represent a set of exceptions in a tree-like structure. Besides its InnerExceptions property which is a read-only collection of exceptions, the most relevant members of this new type are the methods Flatten and Handle. The former allows to flatten a tree hierarchy removing the need to recur while working with an aggregate exception. For example, if we would flatten the exception tree illustrated in the previous figure the result would be: The other method, Handle, accepts a predicate that is invoked for each aggregated exception and returns a boolean indicating if each exception is handled or not. If at least one exception goes unhandled then Handle throws a new AggregateException containing only the unhandled exceptions. The following code snippet illustrates this behavior and also another scenario where an aggregate exception proves useful – single threaded batch processing. static void Main() { try { ConvertAllToInt32("10", "x1x", "0", "II"); } catch (AggregateException errors) { // Contained exceptions are all FormatException // so Handle does not thrown any exception errors.Handle(e => e is FormatException); } try { ConvertAllToInt32("1", "1x", null, "-2", "#4"); } catch (AggregateException errors) { // Handle throws a new AggregateException containing // the exceptions for which the predicate failed. // In this case it will contain a single ArgumentNullException errors.Handle(e => e is FormatException); } } private static int[] ConvertAllToInt32(params string[] values) { var errors = new List<Exception>(); var integers = new List<int>(); foreach (var item in values) { try { integers.Add(Int32.Parse(item)); } catch (Exception e) { errors.Add(e); } } if (errors.Count > 0) throw new AggregateException(errors); return integers.ToArray(); }

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  • Need help with PHP web app bootstrapping error potentially related to Zend [migrated]

    - by Matt Shepherd
    I am trying to get a program called OpenFISMA running on an Ubuntu AMI in AWS. The app is not really coded on the Ubuntu platform, but I am in my comfort zone there, and have tried both CentOS and OpenSUSE (both are sort of "native" for the app) for getting it working with the same or worse results. So, why not just get it working on Ubuntu? Anyway, the app is found here: www.openfisma.org and an install guide is found here: https://openfisma.atlassian.net/wiki/display/030100/Installation+Guide The install guide kind of sucks. It doesn't list dependencies in any coherent way or provide much of any detail (does not even mention Zend once on the entire page) so I've done a lot of work to divine the information I do have. This page provided some dependency inf (though again, Zend is not mentioned once): https://openfisma.atlassian.net/wiki/display/PUBLIC/RPM+Management#RPMManagement-BasicOverviewofRPMPackages Anyway, I got all the way through the install (so far as I could reconstruct it). I am going to the login page for the first time, and there should be some sort of bootstrapping occurring when I load the page. (I am not a programmer so I have no idea what it is doing there.) Anyway, I get a message on the web page that says: "An exception occurred while bootstrapping the application." So, then I go look in /var/www/data/logs/php.log and find this message: [22-Oct-2013 17:29:18 UTC] PHP Fatal error: Uncaught exception 'Zend_Exception' with message 'No entry is registered for key 'Zend_Log'' in /var/www/library/Zend/Registry.php:147 Stack trace: #0 /var/www/public/index.php(188): Zend_Registry::get('Zend_Log') #1 {main} thrown in /var/www/library/Zend/Registry.php on line 147 This occurs every time I load the page. I gather there is an issue related to registering the Zend_Log variable in the Zend registry, but other than that I really have no idea what to do about it. Am I missing a package that it needs, or is this app not coded to register the variables properly? I have no clue. Any help is greatly appreciated. The application file referenced in the log message (index.php) is included below. <?php /** * Copyright (c) 2008 Endeavor Systems, Inc. * * This file is part of OpenFISMA. * * OpenFISMA is free software: you can redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later * version. * * OpenFISMA is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License along with OpenFISMA. If not, see * {@link http://www.gnu.org/licenses/}. */ try { defined('APPLICATION_PATH') || define( 'APPLICATION_PATH', realpath(dirname(__FILE__) . '/../application') ); // Define application environment defined('APPLICATION_ENV') || define( 'APPLICATION_ENV', (getenv('APPLICATION_ENV') ? getenv('APPLICATION_ENV') : 'production') ); set_include_path( APPLICATION_PATH . '/../library/Symfony/Components' . PATH_SEPARATOR . APPLICATION_PATH . '/../library' . PATH_SEPARATOR . get_include_path() ); require_once 'Fisma.php'; require_once 'Zend/Application.php'; $application = new Zend_Application( APPLICATION_ENV, APPLICATION_PATH . '/config/application.ini' ); Fisma::setAppConfig($application->getOptions()); Fisma::initialize(Fisma::RUN_MODE_WEB_APP); $application->bootstrap()->run(); } catch (Zend_Config_Exception $zce) { // A zend config exception indicates that the application may not be installed properly echo '<h1>The application is not installed correctly</h1>'; $zceMsg = $zce->getMessage(); if (stristr($zceMsg, 'parse_ini_file') !== false) { if (stristr($zceMsg, 'application.ini') !== false) { if (stristr($zceMsg, 'No such file or directory') !== false) { echo 'The ' . APPLICATION_PATH . '/config/application.ini file is missing.'; } elseif (stristr($zceMsg, 'Permission denied') !== false) { echo 'The ' . APPLICATION_PATH . '/config/application.ini file does not have the ' . 'appropriate permissions set for the application to read it.'; } else { echo 'An ini-parsing error has occured in ' . APPLICATION_PATH . '/config/application.ini ' . '<br/>Please check this file and make sure everything is setup correctly.'; } } else if (stristr($zceMsg, 'database.ini') !== false) { if (stristr($zceMsg, 'No such file or directory') !== false) { echo 'The ' . APPLICATION_PATH . '/config/database.ini file is missing.<br/>'; echo 'If you find a database.ini.template file in the config directory, edit this file ' . 'appropriately and rename it to database.ini'; } elseif (stristr($zceMsg, 'Permission denied') !== false) { echo 'The ' . APPLICATION_PATH . '/config/database.ini file does not have the appropriate ' . 'permissions set for the application to read it.'; } else { echo 'An ini-parsing error has occured in ' . APPLICATION_PATH . '/config/database.ini ' . '<br/>Please check this file and make sure everything is setup correctly.'; } } else { echo 'An ini-parsing error has occured. <br/>Please check all configuration files and make sure ' . 'everything is setup correctly'; } } elseif (stristr($zceMsg, 'syntax error') !== false) { if (stristr($zceMsg, 'application.ini') !== false) { echo 'There is a syntax error in ' . APPLICATION_PATH . '/config/application.ini ' . '<br/>Please check this file and make sure everything is setup correctly.'; } elseif (stristr($zceMsg, 'database.ini') !== false) { echo 'There is a syntax error in ' . APPLICATION_PATH . '/config/database.ini ' . '<br/>Please check this file and make sure everything is setup correctly.'; } else { echo 'A syntax error has been reached. <br/>Please check all configuration files and make sure ' . 'everything is setup correctly.'; } } else { // Then the exception message says nothing about parse_ini_file nor 'syntax error' echo 'Please check all configuration files, and ensure all settings are valid.'; } echo '<br/>For more information and help on installing OpenFISMA, please refer to the ' . '<a target="_blank" href="http://manual.openfisma.org/display/ADMIN/Installation">' . 'Installation Guide</a>'; } catch (Doctrine_Manager_Exception $dme) { echo '<h1>An exception occurred while bootstrapping the application.</h1>'; // Does database.ini have valid settings? Or is it the same content as database.ini.template? $databaseIniFail = false; $iniData = file(APPLICATION_PATH . '/config/database.ini'); $iniData = str_replace(chr(10), '', $iniData); if (in_array('db.adapter = ##DB_ADAPTER##', $iniData)) { $databaseIniFail = true; } if (in_array('db.host = ##DB_HOST##', $iniData)) { $databaseIniFail = true; } if (in_array('db.port = ##DB_PORT##', $iniData)) { $databaseIniFail = true; } if (in_array('db.username = ##DB_USER##', $iniData)) { $databaseIniFail = true; } if (in_array('db.password = ##DB_PASS##', $iniData)) { $databaseIniFail = true; } if (in_array('db.schema = ##DB_NAME##', $iniData)) { $databaseIniFail = true; } if ($databaseIniFail) { echo 'You have not applied the settings in ' . APPLICATION_PATH . '/config/database.ini appropriately. ' . 'Please review the contents of this file and try again.'; } else { if (Fisma::debug()) { echo '<p>' . get_class($dme) . '</p><p>' . $dme->getMessage() . '</p><p>' . "<p><pre>Stack Trace:\n" . $dme->getTraceAsString() . '</pre></p>'; } else { $logString = get_class($dme) . "\n" . $dme->getMessage() . "\nStack Trace:\n" . $dme->getTraceAsString() . "\n"; Zend_Registry::get('Zend_Log')->err($logString); } } } catch (Exception $exception) { // If a bootstrap exception occurs, that indicates a serious problem, such as a syntax error. // We won't be able to do anything except display an error. echo '<h1>An exception occurred while bootstrapping the application.</h1>'; if (Fisma::debug()) { echo '<p>' . get_class($exception) . '</p><p>' . $exception->getMessage() . '</p><p>' . "<p><pre>Stack Trace:\n" . $exception->getTraceAsString() . '</pre></p>'; } else { $logString = get_class($exception) . "\n" . $exception->getMessage() . "\nStack Trace:\n" . $exception->getTraceAsString() . "\n"; Zend_Registry::get('Zend_Log')->err($logString); } }

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  • Allen for Umbraco with location EXIF meta data

    - by Vizioz Limited
    The latest version of Allen for Umbraco has now hit the Apple App store, we have managed to add some nice improvements to this version that include:Storing location and direction information when photos are taken within the AppEmbedding EXIF data into the images when they are uploadBackground UploadingPull to refresh the media tree Location and DirectionBy default when the camera is used within an application the location and direction that the camera is pointing is not stored within the image meta data. We have now added full support so that this data is now added. We have added a setting which allows you to prevent this data from being uploaded to your website if you do not want the location data to be sent you can turn it off within Allen, Note: Please don't forget that location services do need to be turned on to allow the app to access the images in the phone's asset library.We have had quite a few ideas from users already for using this location data, including logging free parking in Denmark to geo-tagging holiday photos and linking the photos to Google street view. Embedding EXIF dataWe now embed all the meta data available on the iPhone into the image when it is uploaded to your server, this allows you to pull the data out and use it within your site. Have a look at Cultiv's Photo Meta Data package for great example code that allows you to automatically pull this data out and populate properties on your Umbraco media item.We slightly modified the source code of this package to allow the package to always extract the image data, as the default package requires a property to allow the data to be extracted, it's an easy change, if you get stuck add a comment to this post. Background UploadingIf you try to upload multiple images and need to start doing something else on your phone, you can now click the home button and the application will continue to upload your images in the background. As soon as it has finished you will receive a standard Apple notification. Pull to RefreshOur final enhancement has been to add "Pull to refresh" to the media trees, just pull the tree downwards with your finger and it will refresh, this is useful if you are adding items to your media tree while testing your site with Allen for Umbraco. Future enhancements.. your ideas?If you have any ideas for future enhancement feel free to add a comment below!

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  • Blog/CMS software with editing style like Stack Exchange

    - by Merlyn Morgan-Graham
    I have been updating a Wordpress blog lately and found the turnaround time for content creation and editing is much worse than for Stack Overflow posts. Part of this has to do with being original compositions rather than riffing off a question. But part of it is the software. I am looking for CMS/blog software that has an overall editing experience similar to Stack Overflow. The most important features I'm looking for: Inline editing (mostly) Real-time preview on the same page are all important features for speeding up data entry. Markdown support (with inline and block-level code support) Syntax hilighting The features I must maintain from my self-hosted Wordpress: Somewhat popular/supported software, with extensibility support Self hostable Will work with MySql Wordpress has plugins for all these, but they don't necessarily work together. For example I've found a few markdown-on-save plugins, but I doubt those have a chance of ever supporting inline editing or real time previews. Also the most popular syntax hilighting plugins don't support inline code blocks, and I doubt previews would work with other syntax hilighting methods. If I get a wiki/web page content creation system along with it, or somehow integrate this into GitHub (with all the features I requested) I'll accept those as side benefits :) Formed as a question: Are there any pieces of content creation software for making a blog that support an editing style like Stack Exchange and Stack Overflow? Or magic combinations of Wordpress plugins that offer the same?

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  • Why are some checkboxes in Software Updater disabled?

    - by Drew Noakes
    In Ubuntu 13.04, the Software Updater shows some apps as having updates, but they're non-selectable: It's not clear why they're greyed out. On the command line: $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: gnuplot-nox gnuplot-x11 nvidia-current 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded. Note too that running apt-get dist-upgrade does not cause them to be installed either, as it sometimes does with packages that are kept back. Here's the output: $ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages have been kept back: gnuplot-nox gnuplot-x11 nvidia-current 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded. I took @quidage's suggestion, which gives the following. However subsequent upgrades show the same message: $ sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

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  • Documentation often ommits to specify which flavour of regular expression to use, so is there a default flavour that we should all be familiar with?

    - by JW01
    Often I come across documentation that says "use a regular expression here" I have to spend quite some time digging around trying to work out which regular expression format they are expecting. As far as I can tell, there are many types of regular expression. But, at my last place of work I was made to feel stupid when I suggested adding some text to our User Documentation to specify the type of regular expression to be used. When someone says "a regular expression" what is the regular expression syntax most people expect and where is it documented? Update: I was prompted to single-out some examples - but no disrespect to these great projects: eregi docs page is not particularly helpful in explaining expected syntax. Nor can I easily work out the syntax expected here if i just land on the page from a search. No explicit mention of the regular expression pattern expected by PatternExpectation() on the SimpleTest page. etc. etc. here is a highly voted SO answer that seems to assume there is only one flavour of regular expressions.

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  • How to fix a dpkg broken by the Brother MFC-7340 deb driver

    - by Roman A. Taycher
    I'm getting an apt-get error that says E: The package brmfc7340lpr needs to be reinstalled, but I can't find an archive for it. (the brmfc7340lpr is a printer driver) its a local deb file, doing an dpkg or apt-get purge doesn't work, neither does apt-get install -f How do I reinstall a package from a local deb file? P.S. box-name% sudo apt-get upgrade [sudo] password for username: Reading package lists... Done Building dependency tree Reading state information... Done E: The package brmfc7340lpr needs to be reinstalled, but I can't find an archive for it. box-name% sudo apt-get purge brmfc7340lpr Reading package lists... Done Building dependency tree Reading state information... Done E: The package brmfc7340lpr needs to be reinstalled, but I can't find an archive for it. box-name% sudo dpkg --purge brmfc7340lpr dpkg: error processing brmfc7340lpr (--purge): Package is in a very bad inconsistent state - you should reinstall it before attempting a removal. Errors were encountered while processing: brmfc7340lpr box-name% sudo dpkg --install brmfc7340lpr-2.0.2-1.i386.deb Selecting previously deselected package brmfc7340lpr. (Reading database ... 725204 files and directories currently installed.) Preparing to replace brmfc7340lpr 2.0.2-1 (using .../brmfc7340lpr-2.0.2-1.i386.deb) ... Unpacking replacement brmfc7340lpr ... start: Unknown job: lpd dpkg: warning: subprocess old post-removal script returned error exit status 1 dpkg - trying script from the new package instead ... start: Unknown job: lpd dpkg: error processing brmfc7340lpr-2.0.2-1.i386.deb (--install): subprocess new post-removal script returned error exit status 1 start: Unknown job: lpd dpkg: error while cleaning up: subprocess new post-removal script returned error exit status 1 Errors were encountered while processing: brmfc7340lpr-2.0.2-1.i386.deb box-name% sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done E: The package brmfc7340lpr needs to be reinstalled, but I can't find an archive for it. box-name%

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  • Groovy Debugging

    - by Vijay Allen Raj
    Groovy Debugging - An Overview:ADF BC developers may express snippets of business logic (like the following) as embedded groovy expressions: default / calculated attribute valuesvalidation rules / conditionserror message tokensLOV input values (VO) This approach has the advantages that: Groovy has a compact, EL-like syntax for expressing simple logicADF has extended this syntax to provide useful built-insembedded Groovy expressions are customizableGroovy debugging support helps improve maintainability of business logic expressed in Groovy.Following is an example how groovy debugging works.Example:This example shows how a script expression validator can be created and the groovy script debugged. It shows Step over, breakpoint functionalities as well as syntax coloring.Let us create a ADFBC application based on Emp and Dept tables, and add a script expression validator based on the script:  if (Sal >= 5000){ //If EmpSal is greater than a property value set on the custom //properties on the root AM //raise a custom exception else raise a custom warning if (Sal >= source.DBTransaction.rootApplicationModule.propertiesMap.salHigh) { adf.error.raise("ExcGreaterThanApplicationLimit"); } else { adf.error.warn("WarnGreaterThan5000"); } } else if (EmpSal <= 1000) { adf.error.raise("ExcTooLow"); }return true;In the Emp.xml Flat editor, place breakpoints at various locations as shown below:Right click the appmodule and click Debug. Enter a value greater than 5000 and click next. You can see the debugging work as shown below:  The code can be also be stepped over and debugged.

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  • Finding a way to simplify complex queries on legacy application

    - by glenatron
    I am working with an existing application built on Rails 3.1/MySql with much of the work taking place in a JavaScript interface, although the actual platforms are not tremendously relevant here, except in that they give context. The application is powerful, handles a reasonable amount of data and works well. As the number of customers using it and the complexity of the projects they create increases, however, we are starting to run into a few performance problems. As far as I can tell, the source of these problems is that the data represents a tree and it is very hard for ActiveRecord to deterministically know what data it should be retrieving. My model has many relationships like this: Project has_many Nodes has_many GlobalConditions Node has_one Parent has_many Nodes has_many WeightingFactors through NodeFactors has_many Tags through NodeTags GlobalCondition has_many Nodes ( referenced by Id, rather than replicating tree ) WeightingFactor has_many Nodes through NodeFactors Tag has_many Nodes through NodeTags The whole system has something in the region of thirty types which optionally hang off one or many nodes in the tree. My question is: What can I do to retrieve and construct this data faster? Having worked a lot with .Net, if I was in a similar situation there, I would look at building up a Stored Procedure to pull everything out of the database in one go but I would prefer to keep my logic in the application and from what I can tell it would be hard to take the queried data and build ActiveRecord objects from it without losing their integrity, which would cause more problems than it solves. It has also occurred to me that I could bunch the data up and send some of it across asynchronously, which would not improve performance but would improve the user perception of performance. However if sections of the data appeared after page load that could also be quite confusing. I am wondering whether it would be a useful strategy to make everything aware of it's parent project, so that one could pull all the records for that project and then build up the relationships later, but given the ubiquity of complex trees in day to day programming life I wouldn't be surprised if there were some better design patterns or standard approaches to this type of situation that I am not well versed in.

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  • Why the R# Method Group Refactoring is Evil

    - by Liam McLennan
    The refactoring I’m talking about is recommended by resharper when it sees a lambda that consists entirely of a method call that is passed the object that is the parameter to the lambda. Here is an example: public class IWishIWasAScriptingLanguage { public void SoIWouldntNeedAllThisJunk() { (new List<int> {1, 2, 3, 4}).Select(n => IsEven(n)); } private bool IsEven(int number) { return number%2 == 0; } } When resharper gets to n => IsEven(n) it underlines the lambda with a green squiggly telling me that the code can be replaced with a method group. If I apply the refactoring the code becomes: public class IWishIWasAScriptingLanguage { public void SoIWouldntNeedAllThisJunk() { (new List<int> {1, 2, 3, 4}).Select(IsEven); } private bool IsEven(int number) { return number%2 == 0; } } The method group syntax implies that the lambda’s parameter is the same as the IsEven method’s parameter. So a readable, explicit syntax has been replaced with an obfuscated, implicit syntax. That is why the method group refactoring is evil.

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  • apt-get failed install of libg15, all package management is failing

    - by Stifle
    I was trying to get my Logitech G510 keyboard's back-lights working so I went into the Synaptic Package Manager and marked LibG15, G15daemon, and all the other associated packages. Synaptic reported a failed install. Now all Package management is failing due to libg15 being "halfway installed." Some commands I have tried to fix the problem follow. . . root@bt:~# apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done E: The package libg15 needs to be reinstalled, but I can't find an archive for it. root@bt:~# sudo apt-get autoremove Reading package lists... Done Building dependency tree Reading state information... Done E: The package libg15 needs to be reinstalled, but I can't find an archive for it. root@bt:~# sudo apt-get -f purge libg15 Reading package lists... Done Building dependency tree Reading state information... Done E: The package libg15 needs to be reinstalled, but I can't find an archive for it. root@bt:~# sudo dpkg --configure -a dpkg: dependency problems prevent configuration of g15macro: g15macro depends on g15daemon; however: Package g15daemon is not configured yet. dpkg: error processing g15macro (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of g15stats: g15stats depends on g15daemon; however: Package g15daemon is not configured yet. dpkg: error processing g15stats (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: g15macro g15stats I'm not too computer savvy. Any help would be much appreciated!!! Note: I'm using Ubuntu 10.04 under Backtrack 5 R3.

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  • Making LISPs manageable

    - by Andrea
    I am trying to learn Clojure, which seems a good candidate for a successful LISP. I have no problem with the concepts, but now I would like to start actually doing something. Here it comes my problem. As I mainly do web stuff, I have been looking into existing frameworks, database libraries, templating libraries and so on. Often these libraries are heavily based on macros. Now, I like very much the possibility of writing macros to get a simpler syntax than it would be possible otherwise. But it definitely adds another layer of complexity. Let me take an example of a migration in Lobos from a blog post: (defmigration add-posts-table (up [] (create clogdb (table :posts (integer :id :primary-key ) (varchar :title 250) (text :content ) (boolean :status (default false)) (timestamp :created (default (now))) (timestamp :published ) (integer :author [:refer :authors :id] :not-null)))) (down [] (drop (table :posts )))) It is very readable indeed. But it is hard to recognize what the structure is. What does the function timestamp return? Or is it a macro? Having all this freedom of writing my own syntax means that I have to learn other people's syntax for every library I want to use. How can I learn to use these components effectively? Am I supposed to learn each small DSL as a black box?

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  • Parallelize incremental processing in Tabular #ssas #tabular

    - by Marco Russo (SQLBI)
    I recently came in a problem trying to improve the parallelism of Tabular processing. As you know, multiple tables can be processed in parallel, whereas the processing of several partitions within the same table cannot be parallelized. When you perform an incremental update by adding only new rows to existing table, what you really do is adding rows to a partition, so adding rows to many tables means adding rows to several partitions. The particular condition you have in this case is that every partition in which you add rows belongs to a different table. Adding rows implies using the ProcessAdd command; its QueryBinding parameter specifies a SQL syntax to read new rows, otherwise the original query specified for the partition will be used, and it could generate duplicated data if you don’t have a dynamic behavior on the SQL side. If you create the required XMLA code manually, you will find that the QueryBinding node that should be part of the ProcessAdd command has to be moved out from ProcessAdd in case you are using a Batch command with more than one Process command (which is the reason why you want to use a single batch: run multiple process operations in parallel!). If you use AMO (Analysis Management Objects) you will find that this combination is not supported, even if you don’t have a syntax error compiling the code, but you might obtain this error at execution time: The syntax for the 'Process' command is incorrect. The 'Bindings' keyword cannot appear under a 'Process' command if the 'Process' command is a part of a 'Batch' command and there are more than one 'Process' commands in the 'Batch' or the 'Batch' command contains any out of line related information. In this case, the 'Bindings' keyword should be a part of the 'Batch' command only. If this is happening to you, the best solution I’ve found is manipulating the XMLA code generated by AMO moving the Binding nodes in the right place. A more detailed description of the issue and the code required to send a correct XMLA batch to Analysis Services is available in my article Parallelize ProcessAdd with AMO. By the way, the same technique (and code) can be used also if you have the same problem in a Multidimensional model.

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  • Using Behavior Trees and Events together

    - by weichsem
    I am beginning to work with behavior trees and am unsure how events should be handled within the tree. Lets say we have a space game where the player is dogfighting with a handful of other ships, some friendly some not. The player destroys a ship and the rest of the hostile ships should then start to retreat. How was should the shipWasDestroyed event effect the other ship's behavior trees so that they start running the retreat behavior? One way I could think of doing this is have all the conditions I care about be high level nodes that effectively state change the ship. This would mean I'd have to check all of these state change conditions on every frame the behavior tree was run, even if they are very rare occurrences. I'd prefer not doing this for performance and complexity reasons. From looking at the Halo papers on behavior trees it seems that they handled this by dynamically placing nodes into the tree when the event occurred. It seems like calculating where the new node should go could be problematic depending on the current state of the running behavior. How is this normally handled?

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  • Installing latest version of R-base

    - by Student
    I have been unsuccessfully trying to install the latest version (2.15.2) of r-base. Apparently, R package "Rcpp" would not install for R version 2.14.1 - the version that installs for me. I am not sure what/how/where to change my installation attempts which appear below. Please note that I am using ubuntu-12.04.1-server-i386. (1) ------------ The current installed version is R version 2.14.1 (2011-12-22) sudo apt-get install r-base Reading package lists... Done Building dependency tree Reading state information... Done r-base is already the newest version. (2) ------------ Including version information doesn't help: sudo apt-get install r-base=2.15.1-5ubuntu1 Reading package lists... Done Building dependency tree Reading state information... Done E: Version '2.15.1-5ubuntu1' for 'r-base' was not found (3) ------------- Changes based on CRAN Ubuntu instructions http://cran.r-project.org/bin/linux/ubuntu/README 3.1: Added to /etc/apt/sources.list deb http://lib.stat.cmu.edu/R/CRAN/bin/linux/ubuntu quantal/ 3.2: sudo apt-get update 3.3: sudo apt-get install r-base Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: r-base : Depends: r-base-core (= 2.15.2-1quantal2) but it is not going to be installed Depends: r-recommended (= 2.15.2-1quantal2) but it is not going to be installed Recommends: r-base-html but it is not going to be installed E: Unable to correct problems, you have held broken packages.

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  • F# &ndash; Converting your C# brain to the F# way

    - by MarkPearl
    My brain still thinks in C#!!! I have been looking at F# and trying to figure out the basics of it, but all the time in the back of my mind I am going – what is the C# equivalent to this or that… It’s frustrating because I almost want a F# to C# dictionary the whole time – and simply translate my C# code to F# – which would negate the main motivation for learning F# – as I want learn functional programming - if I was simply doing C# code in a F# syntax I would be gaining nothing! So I am experiencing pain while my brain forms some new neural networks… but luckily I live in a country where we have 11 official spoken languages, and plenty more unofficial languages so I have gone through the pain of learning how to speak a new language before – and I am finding the process is almost identical in learning a programming language that promotes a different way of looking at problems (from Object Orientated to Functional). That beings said… the first thing to learn is the basic syntax… I have searched the web for appropriate places to get a translation – and have been quite disappointed with what is out there for F#. Luckily, OCaml came to the rescue. There are some really good tutorials on getting started with OCaml syntax, one in particular that stood out was the OCamal-Tutorial. What I particularly like about it is that it is doing comparisons between C based languages and OCaml. Give it a read sometime – it’s well worth it and has definitely helped me understand F# a little better.

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  • Information I need to know as a Java Developer [on hold]

    - by Woy
    I'm a java developer. I'm trying to get more knowledge to become a better programmer. I've listed a number of technologies to learn. Instead of what I've listed, what technologies would you suggest to learn as well for a Junior Java Developer? I realize, there's a lot of things to study. Java: - how a garbage collector works - resource management - network programming - TCP/IP HTTP - transactions, - consistency: interfaces, classes collections, hash codes, algorithms, comp. complexity concurrent programming: synchronizing, semafores steam management metability: thread-safety byte code manipulations, reflections, Aspect-Oriented Programming as base to understand frameworks such as Spring etc. Web stack: servlets, filters, socket programming Libraries: JDK, GWT, Apache Commons, Joda-Time, Dependency Injections: Spring, Nano Tools: IDE: very good knowledge - debugger - profiler - web analyzers: Wireshark, firebugs - unit testing SQL/Databases: Basics SELECTing columns from a table Aggregates Part 1: COUNT, SUM, MAX/MIN Aggregates Part 2: DISTINCT, GROUP BY, HAVING + Intermediate JOINs, ANSI-89 and ANSI-92 syntax + UNION vs UNION ALL x NULL handling: COALESCE & Native NULL handling Subqueries: IN, EXISTS, and inline views Subqueries: Correlated ITH syntax: Subquery Factoring/CTE Views Advanced Topics Functions, Stored Procedures, Packages Pivoting data: CASE & PIVOT syntax Hierarchical Queries Cursors: Implicit and Explicit Triggers Dynamic SQL Materialized Views Query Optimization: Indexes Query Optimization: Explain Plans Query Optimization: Profiling Data Modelling: Normal Forms, 1 through 3 Data Modelling: Primary & Foreign Keys Data Modelling: Table Constraints Data Modelling: Link/Corrollary Tables Full Text Searching XML Isolation Levels Entity Relationship Diagrams (ERDs), Logical and Physical Transactions: COMMIT, ROLLBACK, Error Handling

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