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  • Advice for a getting a job in algorithmic trading - writing faster code

    - by Alex
    I am currently an intermediate Java developer working in the financial industry. I am considering trying to get into an algorithmic trading developer position. I am looking for any advice/resources that may help me obtain such a job. My naive initial thoughts are to concentrate on learning how to write faster, more memory efficient code whilst maintaining readability. Can anyone point me in the right direction of some useful resources for what I am aiming to achieve?

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  • How does flash store (represent) movieclips and sprites?

    - by humbleBee
    When we draw any object in flash and convert it into a movieclip or a sprite, how is it stored or represented in flash. I know in vector art it is stored or represented as line segments using formulae. Is there any way to get the vertices of the shape that was drawn? For example, lets say a simple rectangle is drawn and is converted to a movieclip. Is there anyway to obtain the vertices and the line segments from the sprite? So that its shape is obtained. Enough information should be obtained so that the shape can be replicated. That's the key - replication. In simple terms, where does flash store information about a shape that has been drawn so that we can obtain it and attempt to replicate the shape ourselves?

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  • Is the book "Structure and Interpretation of Computer Programs" a good read for java programmers?

    - by anything
    This may be subjective and likely to be closed but I still wanted to know if its really helpfull to read Structure and Interpretation of Computer programs. Structure and Interpretation of Computer Programs The book does not use java. Not that I wanted to learn java. I am just curious as to know if it be will useful read to be a better programmer and what are the things that I can gain from the book or are their any other alternatives to this book more suited to java programmers?

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  • web vs desktop? (php vs c++?)

    - by Dhaivat Pandya
    I need to write a simple file transfer mechanism (that isn't ftp). Firstly, it must have a GUI. Secondly, it must not be dropbox. Third, it may not use any paid libraries, and hopefully, it uses open source components. The question that came to my mind is, where is everyone moving, from desktop to web, or from web to desktop? Would it be more useful to be experienced in say, C++ than in PHP (or vice versa)?

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  • asus n550jv audio problem: no sound from notebook' speakers

    - by skywalker
    Ubuntu 13.10. The problem is: the internal speakers don't work. I have no problem when I'm using the headphones. There is no hardware issue since in windows 8 everything works perfectly(external subwoofer included). I'm trying to modify /etc/modprobe.d/alsa-base.conf but I can't find the correct model to put into: options snd-hda-intel model= The file HD-Audio-Models.txt doesn't contain the model for ALC668. Some info: :~sudo aplay -l **** List of PLAYBACK Hardware Devices **** card 0: MID [HDA Intel MID], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: MID [HDA Intel MID], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: MID [HDA Intel MID], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: PCH [HDA Intel PCH], device 0: ALC668 Analog [ALC668 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 :~$ sudo lspci -v | grep -A7 -i "audio" 00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06) Subsystem: Intel Corporation Device 2010 Flags: bus master, fast devsel, latency 0, IRQ 52 Memory at f7a14000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Kernel driver in use: snd_hda_intel -- 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 04) Subsystem: ASUSTeK Computer Inc. Device 11cd Flags: bus master, fast devsel, latency 0, IRQ 53 Memory at f7a10000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [100] Virtual Channel PS info :~$ amixer -c 0 Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',1 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] Simple mixer control 'IEC958',2 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [on] :~$ pacmd dump-volumes Welcome to PulseAudio! Use "help" for usage information. Sink 0: reference = 0: 76% 1: 76%, real = 0: 76% 1: 76%, soft = 0: 100% 1: 100%, current_hw = 0: 76% 1: 76%, save = yes Input 8: volume = 0: 100% 1: 100%, reference_ratio = 0: 100% 1: 100%, real_ratio = 0: 100% 1: 100%, soft = 0: 100% 1: 100%, volume_factor = 0: 100% 1: 100%, volume_factor_sink = 0: 100% 1: 100%, save = no Source 0: reference = 0: 100% 1: 100%, real = 0: 100% 1: 100%, soft = 0: 100% 1: 100%, current_hw = 0: 100% 1: 100%, save = no Source 1: reference = 0: 16% 1: 16%, real = 0: 16% 1: 16%, soft = 0: 100% 1: 100%, current_hw = 0: 16% 1: 16%, save = yes

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  • How To Colorize Black and White Vintage Photographs in Photoshop

    - by Eric Z Goodnight
    Ever wanted to add color to your old, vintage, or historical photographs? Load up some old pictures and see how color can be added quickly to any black and white photograph in this simple Photoshop how to. While many purists simply don’t like the look of colorized black and white photographs, the ability to add color to black and white images is as indispensible as it is simple. Read on to see just how easy it can be Latest Features How-To Geek ETC How To Create Your Own Custom ASCII Art from Any Image How To Process Camera Raw Without Paying for Adobe Photoshop How Do You Block Annoying Text Message (SMS) Spam? How to Use and Master the Notoriously Difficult Pen Tool in Photoshop HTG Explains: What Are the Differences Between All Those Audio Formats? How To Use Layer Masks and Vector Masks to Remove Complex Backgrounds in Photoshop Hack a Wireless Doorbell into a Snail Mail Indicator Enjoy Clutter-Free YouTube Video Viewing in Opera with CleanTube Bring Summer Back to Your Desktop with the LandscapeTheme for Chrome and Iron The Prospector – Home Dash Extension Creates a Whole New Browsing Experience in Firefox KinEmote Links Kinect to Windows Why Nobody Reads Web Site Privacy Policies [Infographic]

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  • Tips For Hiring a Dedicated Web Developer

    Fed up by making pockets empty in order to successfully establish business in online market? Hire a dedicated web developer and give dimensions to business. Simply follow some useful guidelines given in this article to find out a highly skilled developer for business.

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  • How to hide a partition?

    - by snark
    I bought a small 32 GB SSD to store the operating system (Windows 7) and my applications. I'll copy the existing boot partition (30 GB) from my harddisk (WD Velociraptor) to the SSD using GParted but I'd like to keep the existing partition intact (keeping all data on it) so I can go back to it if there is a problem with the SSD. How can I hide the partition so it is not visible anymore to Windows? What should I change with GParted? Second question: how can I keep the harddisk partition synced with the SSD so I have a backup? I'm looking for a near real-time solution (not something like Acronis Drive Image).

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  • IKEA Lamps Hacked into Flexible Speaker Mounts

    - by Jason Fitzpatrick
    This simple hack combines the swing arms of two IKEA work lamps with a set of computer speakers for flexible and easily adjustable sound. IKEAHackers reader Bill Dwyer wanted an easy way to get the speakers off his desk but still be able to easily adjust them. By hacking apart two IKEA work lamps (he removed the light assembly and snipped the wires off) he was able to attach his computer speakers to the arms and, in the process, get them off the desk. The arms make it super simple to adjust the speakers exactly where he wants them, including towards other parts of his office/apartment. Hit up the link below to check out more pictures and read Bill’s instructions. Very Flexible Computer Speaker Mounts [IKEAHackers] Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed How to Run Android Apps on Your Desktop the Easy Way HTG Explains: Do You Really Need to Defrag Your PC?

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  • Expert Cube Development book finally on Kindle!

    - by Marco Russo (SQLBI)
    The book Expert Cube Development with Microsoft SQL Server 2008 Analysis Services is finally available on Kindle ! I received many requests for that and the last one just a couple of days ago from Greg Low in its useful review . I'm curious to see whether the sales of this book will continue also on Kindle. After 2 years this book is still continuing to sell as in the first months. The content is still fresh and will be good also with the next release of Analysis Services for developing multidimensional...(read more)

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  • How to Make and Install an Electric Outlet in a Cabinet or Desk

    - by Eric Z Goodnight
    If you’re like most geeks, you’re always looking for power—there’s never an outlet where you need one! With this simple how-to, see how you can install an outlet in a desk, cabinet or wherever—right where you need it! It’s simple, fun, and reasonably cheap, so why not install some outlets exactly where you need them? There are kits available to buy online, but these are often quite expensive. See how you can buy off the shelf, stock parts and install an outlet wherever you want to.  How to Make and Install an Electric Outlet in a Cabinet or DeskHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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  • How to fetch only the sprites in the player's range of motion for collision testing? (2D, axis aligned sprites)

    - by Twodordan
    I am working on a 2D sprite game for educational purposes. (In case you want to know, it uses WebGl and Javascript) I've implemented movement using the Euler method (and delta time) to keep things simple. Now I'm trying to tackle collisions. The way I wrote things, my game only has rectangular sprites (axis aligned, never rotated) of various/variable sizes. So I need to figure out what I hit and which side of the target sprite I hit (and I'm probably going to use these intersection tests). The old fashioned method seems to be to use tile based grids, to target only a few tiles at a time, but that sounds silly and impractical for my game. (Splitting the whole level into blocks, having each sprite's bounding box fit multiple blocks I might abide. But if the sprites change size and move around, you have to keep changing which tiles they belong to, every frame, it doesn't sound right.) In Flash you can test collision under one point, but it's not efficient to iterate through all the elements on stage each frame. (hence why people use the tile method). Bottom line is, I'm trying to figure out how to test only the elements within the player's range of motion. (I know how to get the range of motion, I have a good idea of how to write a collisionCheck(playerSprite, targetSprite) function. But how do I know which sprites are currently in the player's vicinity to fetch only them?) Please discuss. Cheers!

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  • Scan problem -Fujitu Scansnap S1300i

    - by user214312
    I'm trying to install a scansnap s1300i scanner on ubuntu 13.10. It is still not working. My question: With a "sudo scanimage -L" command, I receive the response device hpaio:/net/Photosmart_C5100_series?zc=HPBA915D' is a Hewlett-Packard Photosmart_C5100_series all-in-one deviceepjitsu:libusb:002:011' is a FUJITSU ScanSnap S1300i scanner While, with a "scanimage -L"command I receive the response device `hpaio:/net/Photosmart_C5100_series?zc=HPBA915D' is a Hewlett-Packard Photosmart_C5100_series all-in-one What can go wrong ? This is probably a part of the problem. Update: "simple-scan" do not work while "sudo simple-scan" works Thanks.

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  • 5 Plugins To improve the WordPress WYSIWYG Editor

    - by Matt
    TinyMCE, is a web-based platform-independent control for JavaScript/HTML WYSIWYG editor. It released by Moxiecode Systems AB as open source software. CKEditor For WordPress CKEditor is a text editor used inside web pages. You can see the similar text when you are going publishing the text by this editor. CKEditor is compatible with all modern browsers [...] Related posts:Open Source WYSIWYG Text Editors Some Popular WYSIWYG Editors 10 Useful Admin WordPress Plugins

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  • CodePlex Daily Summary for Wednesday, December 12, 2012

    CodePlex Daily Summary for Wednesday, December 12, 2012Popular ReleasesTorrents-List Organizer: Torrents-list organizer v 0.5.0.3: ????????? ? 0.5.0.3: 1) ?????????? ??????? ??? ?????????? ???-??????? ? ???????-??????. 2) ? ??????? ?????? ??????????? ?????????????? ????? ?????????? ?????????: ???? ?? ??????-???? ?????????? ?? ????????? ?? ????? ???????, ?? ? ????? ????? ????????? ????? ????????? ?? ????, ? ????????? ??? ???? ?????? ??????????.Fiskalizacija za developere: FiskalizacijaDev 2.0: Prva prava produkcijska verzija - Zakon je tu, ova je verzija uskladena sa trenutno važecom Tehnickom specifikacijom (v1.2. od 04.12.2012.) i spremna je za produkcijsko korištenje. Verzije iza ove ce ovisiti o naknadnim izmjenama Zakona i/ili Tehnicke specifikacije, odnosno, o eventualnim greškama u radu/zahtjevima community-a za novim feature-ima. Novosti u v2.0 su: - That assembly does not allow partially trusted callers (http://fiskalizacija.codeplex.com/workitem/699) - scheme IznosType...Simple Injector: Simple Injector v1.6.1: This patch release fixes a bug in the integration libraries that disallowed the application to start when .NET 4.5 was not installed on the machine (but only .NET 4.0). The following packages are affected: SimpleInjector.Integration.Web.dll SimpleInjector.Integration.Web.Mvc.dll SimpleInjector.Integration.Wcf.dll SimpleInjector.Extensions.LifetimeScoping.dllBootstrap Helpers: Version 1: First releasesheetengine - Isometric HTML5 JavaScript Display Engine: sheetengine v1.2.0: Main featuresOptimizations for intersectionsThe main purpose of this release was to further optimize rendering performance by skipping object intersections with other sheets. From now by default an object's sheets will only intersect its own sheets and never other static or dynamic sheets. This is the usual scenario since objects will never bump into other sheets when using collision detection. DocumentationMany of you have been asking for proper documentation, so here it goes. Check out the...MySqlBackup.NET - MySQL Backup Solution for C#, VB.NET, ASP.NET: MySqlBackup.NET 1.5.5 beta: Fix Bug: max_allowed_packet is modified to 1GB, but does not take effect in import & export process. This bug is fixed by re-initialize the MySqlConnection. Modified max_allowed_packet will only take effect on new connection, not on current connection.DirectX Tool Kit: December 11, 2012: December 11, 2012 Ex versions of DDSTextureLoader and WICTextureLoader Removed use of ATL's CComPtr in favor of WRL's ComPtr for all platforms to support VS Express editions Updated VS 2010 project for official 'property sheet' integration for Windows 8.0 SDK Minor fix to CommonStates for Feature Level 9.1 Tweaked AlphaTestEffect.cpp to work around ARM NEON compiler codegen bug Added dxguid.lib as a default library for Debug builds to resolve GUID link issuesDirectXTex texture processing library: December 2012: December 11, 2012 Ex versions of CreateTexture, CreateShaderResourceView, DDSTextureLoader and WICTextureLoader Fixed BC2 and BC3 decompression issue for unusual color encoding case Converted annotation to SAL2 for improved VS 2012 /analyze experience Updated DirectXTex, DDSView, and Texconv with VS 2010 + Windows 8.0 SDK project using official 'property sheets'ArcGIS Editor for OpenStreetMap: ArcGIS Editor for OSM 2.1 Final for 10.1: We are proud to announce the release of ArcGIS Editor for OpenStreetMap version 2.1. This download is compatible with ArcGIS 10.1, and includes setups for the Desktop Component, Desktop Component when 64 bit Background Geoprocessing is installed, and the Server Component. Important: if you already have ArcGIS Editor for OSM installed but want to install this new version, you will need to uninstall your previous version and then install this one. This release includes support for the ArcGIS 1...Ad Rotator for Windows & Windows Phone: AdRotator v1.3 Silverlight: Note now also available via NuGet for both WP7 and WP8 v 1.3 Changelog: *Updated Ad Providers to Latest releases, inc: - Inneractive (new Nokia release) - Updated WP Smaato - MS Ad SDK Changed Caching strategy to always grab from network unless unavailable Pubcenter (Suspend/Resume) feature added Pubcenter "Active" fix option Cleaned up some threaded calls Other minor fixes For usage details check out the following tutorial blog post - http://bit.ly/S5CD4T *Note Included bin...SharpCompress - a fully native C# library for RAR, 7Zip, Zip, Tar, GZip, BZip2: SharpCompress 0.8.2: This release just contains some fixes that have been done since the last release. Plus, this is strong named as well. I apologize for the lack of updates but my free time is less these days.Media Companion: MediaCompanion3.511b release: Two more bug fixes: - General Preferences were not getting restored - Fanart and poster image files were being locked, preventing changes to themVodigi Open Source Interactive Digital Signage: Vodigi Release 5.5: The following enhancements and fixes are included in Vodigi 5.5. Vodigi Administrator - Manage Music Files - Add Music Files to Image Slide Shows - Manage System Messages - Display System Messages to Users During Login - Ported to Visual Studio 2012 and MVC 4 - Added New Vodigi Administrator User Guide Vodigi Player - Improved Login/Schedule Startup Procedure - Startup Using Last Known Schedule when Disconnected on Startup - Improved Check for Schedule Changes - Now Every 15 Minutes - Pla...Secretary Tool: Secretary Tool v1.1.0: I'm still considering this version a beta version because, while it seems to work well for me, I haven't received any feedback and I certainly don't want anyone relying solely on this tool for calculations and such until its correct functioning is verified by someone. This version includes several bug fixes, including a rather major one with Emergency Contact Information not saving. Also, reporting is completed. There may be some tweaking to the reporting engine, but it is good enough to rel...VidCoder: 1.4.10 Beta: Added progress percent to the title bar/task bar icon. Added MPLS information to Blu-ray titles. Fixed the following display issues in Windows 8: Uncentered text in textbox controls Disabled controls not having gray text making them hard to identify as disabled Drop-down menus having hard-to distinguish white on light-blue text Added more logging to proxy disconnect issues and increased timeout on initial call to help prevent timeouts. Fixed encoding window showing the built-in pre...WPF Application Framework (WAF): WPF Application Framework (WAF) 2.5.0.400: Version 2.5.0.400 (Release): This release contains the source code of the WPF Application Framework (WAF) and the sample applications. Requirements .NET Framework 4.0 (The package contains a solution file for Visual Studio 2010) The unit test projects require Visual Studio 2010 Professional Changelog Legend: [B] Breaking change; [O] Marked member as obsolete Update the documentation. InfoMan: Write the documentation. Other Downloads Downloads OverviewHome Access Plus+: v8.5: v8.5.1211.1240 Fixed: changed to using the thumbnailPhoto attribute instead of jpegPhoto v8.5.1208.1500 This is a point release, for the other parts of HAP+ see the v8.3 release. Fixed: #me#me issue with the Edit Profile Link Updated: 8.5.1208 release Updated: Documentation with hidden booking system feature Added: Room Drop Down to the Booking System (no control panel interface), can be Resource Specific Fixed: Recursive AD Group Membership Lookup Fixed: User.IsInRole with recursive lookup...Http Explorer: httpExplorer-1.1: httpExplorer now has the ability to connect to http server via web proxies. The proxy may be explicitly specified by hostname or IP address. Or it may be specified via the Internet Options settings of Windows. You may also specify credentials to pass to the proxy if the proxy requires them. These credentials may be NTLM or basic authentication (clear text username and password).Bee OPOA Platform: Bee OPOA Demo V1.0.001: Initial version.Microsoft Ajax Minifier: Microsoft Ajax Minifier 4.78: Fix for issue #18924 - using -pretty option left in ///#DEBUG blocks. Fix for issue #18980 - bad += optimization caused bug in resulting code. Optimization has been removed pending further review.New ProjectsBattle of Colors: Vacation project. Summary.blockme: This is a Blog using C#, ASP.Net MVC3 & RazorCoevery for Windows Phone: Coevery for Windows Phone is a free CRM Windows Phone application developed by Nova Software which is a .NET focused software development company.DNN Flash Viewer: Simple module for displaying flash content within a DNN pane.DonablRow Line Follower Simulator: This Application helps you to find the best Algorithm for your line follower robot.ExcelMerge: Merge microsoft excel file to a single.FCMGAAI: project ini merupakan implementasi algoritma fuzzy Cmeans dengan optimasi algoritma genetikaLIRC#: LIRC# is a simple client library to allow a .NET application to interact with an LIRC server to control or be controlled by IR devices.Managed Media Aggregation: Allowing developers to aggregate media from Rtsp sources over Rtsp without degrading the source bandwidth. Agnostic of Video or Audio format. Decodes Jpeg / RTPMarket Data Server: Local database server with quotes and trade-related data associated with equity, fixed-income, financial derivatives, currency, and other investment instrumentsproject13251212: papproject13271212: paPutovanje: Android aplikacija napisana za Mtel android ligu 2Questionario dinâmico: Questionario dinâmico para fins de estudos.Rasoulian: my RepoSharepoint Blog Archive Web Part: This Web Part is an alternative of the standart SharePoint Blog Site Archives Web Part. It's based on SharePoint 2010 Blog Site Archives Web Part by Bandar AlSimpleSocket for Windows Phone: SimpleSocket for Windows Phone is a super simple to use wrap around the built in socket framework that makes using socket connections incredibly easy and fast.

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  • How to share internet connection on Mac os x to Virtualbox vm’s using Host-only

    - by redben
    In one line : is the following possible : Airport <- "osx bridge" - vbox-Host-only - vm's Virtualbox (3.1.4) setup : Host : Mac OS X 10.5 Guest : Ubuntu Linux adapter1 - Bridged (en1: Airport) : To give the vm access to internet and communicate when Airport is connected adapter2 - Host-Only (vboxnet0) : To enable host/guest communication when Airport is not connected I'd like to make it simpler and only keep adapter 2 (host-only) and relying on os x connection sharing/bridging I thought i could just keep the Host only configuration, and on the host go to internet sharing and select "share from airport" to vboxnet0 . Only to find out that vbox's virtual interface doesn't appear in the interfaces list on os x preferences. I know that on a linux host you could install something called bridge-utils and use that to bridge the two insterfaces. Is there any thing like that for Mac ?

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  • Fast pixelshader 2D raytracing

    - by heishe
    I'd like to do a simple 2D shadow calculation algorithm by rendering my environment into a texture, and then use raytracing to determine what pixels of the texture are not visible to the point light (simply handed to the shader as a vec2 position) . A simple brute force algorithm per pixel would looks like this: line_segment = line segment between current pixel of texture and light source For each pixel in the texture: { if pixel is not just empty space && pixel is on line_segment output = black else output = normal color of the pixel } This is, of course, probably not the fastest way to do it. Question is: What are faster ways to do it or what are some optimizations that can be applied to this technique?

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  • 3d vertex translated onto 2d viewport

    - by Dan Leidal
    I have a spherical world defined by simple trigonometric functions to create triangles that are relatively similar in size and shape throughout. What I want to be able to do is use mouse input to target a range of vertices in the area around the mouse click in order to manipulate these vertices in real time. I read a post on this forum regarding translating 3d world coordinates into the 2d viewport.. it recommended that you should multiply the world vector coordinates by the viewport and then the projection, but they didn't include any code examples, and suffice to say i couldn't get any good results. Further information.. I am using a lookat method for the viewport. Does this cause a problem, and if so is there a solution? If this isn't the problem, does anyone have a simple code example illustrating translating one vertex in a 3d world into a 2d viewspace? I am using XNA.

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  • Oracle Certification Exam Strategies

    - by Paul Sorensen
    We ran across an article from the Transcender team that provides some great tips and strategies for taking Oracle Certification exams from the Trancender team. Transcender - along with Self Test Software, are official providers of Oracle Certification practice tests, and have many options available to help you prepare for your actual exam. Their recent article "Oracle Exam Strategies" has a number of good tips for which anyone preparing to take an exam should find useful. Thanks,QUICK LINKS:Oracle Certification Web SiteOracle Certification: Steps To Become CertifiedOracle Certification: Preparation Strategies

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  • Week in Geek: Windows XP Keeps Fighting On, Refuses to Die Quietly

    - by Asian Angel
    This week’s edition of WIG is filled with news link goodness covering topics such as 600,000+ Macs have been infected with Flashback malware, social media websites are useful tools for modern burglars, Microsoft was one of the top contributors to the Linux kernel in 2011, and more. How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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  • Library to fake intermittent failures according to tester-defined policy?

    - by crosstalk
    I'm looking for a library that I can use to help mock a program component that works only intermittently - usually, it works fine, but sometimes it fails. For example, suppose I need to read data from a file, and my program has to avoid crashing or hanging when a read fails due to a disk head crash. I'd like to model that by having a mock data reader function that returns mock data 90% of the time, but hangs or returns garbage otherwise. Or, if I'm stress-testing my full program, I could turn on debugging code in my real data reader module to make it return real data 90% of the time and hang otherwise. Now, obviously, in this particular example I could just code up my mock manually to test against a random() routine. However, I was looking for a system that allows implementing any failure policy I want, including: Fail randomly 10% of the time Succeed 10 times, fail 4 times, repeat Fail semi-randomly, such that one failure tends to be followed by a burst of more failures Any policy the tester wants to define Furthermore, I'd like to be able to change the failure policy at runtime, using either code internal to the program under test, or external knobs or switches (though the latter can be implemented with the former). In pig-Java, I'd envision a FailureFaker interface like so: interface FailureFaker { /** Return true if and only if the mocked operation succeeded. Implementors should override this method with versions consistent with their failure policy. */ public boolean attempt(); } And each failure policy would be a class implementing FailureFaker; for example there would be a PatternFailureFaker that would succeed N times, then fail M times, then repeat, and a AlwaysFailFailureFaker that I'd use temporarily when I need to simulate, say, someone removing the external hard drive my data was on. The policy could then be used (and changed) in my mock object code like so: class MyMockComponent { FailureFaker faker; public void doSomething() { if (faker.attempt()) { // ... } else { throw new RuntimeException(); } } void setFailurePolicy (FailureFaker policy) { this.faker = policy; } } Now, this seems like something that would be part of a mocking library, so I wouldn't be surprised if it's been done before. (In fact, I got the idea from Steve Maguire's Writing Solid Code, where he discusses this exact idea on pages 228-231, saying that such facilities were common in Microsoft code of that early-90's era.) However, I'm only familiar with EasyMock and jMockit for Java, and neither AFAIK have this function, or something similar with different syntax. Hence, the question: Do such libraries as I've described above exist? If they do, where have you found them useful? If you haven't found them useful, why not?

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  • How to join two collections with LINQ

    - by JustinGreenwood
    Here is a simple and complete example of how to perform joins on two collections with LINQ. I wrote it for a friend to show him, in one simple file, the power of LINQ queries and anonymous objects. In the file below, there are two simple data classes defined: Person and Item. In the beginning of the main method, two collections are created. Note that the Item's OwnerId field reference the PersonId of a Person object. The effect of the LINQ query below is equivalent to a SQL statement looking like this: select Person.PersonName as OwnerName, Item.ItemName as OwnedItem from Person inner join Item on Item.OwnerId = Person.PersonId order by Item.ItemName desc; using System; using System.Collections.Generic; using System.Linq; namespace LinqJoinAnonymousObjects { class Program { class Person { public int PersonId { get; set; } public string PersonName { get; set; } } class Item { public string ItemName { get; set; } public int OwnerId { get; set; } } static void Main(string[] args) { // Create two collections: one of people, and another with their possessions. var people = new List<Person> { new Person { PersonId=1, PersonName="Justin" }, new Person { PersonId=2, PersonName="Arthur" }, new Person { PersonId=3, PersonName="Bob" } }; var items = new List<Item> { new Item { OwnerId=1, ItemName="Armor" }, new Item { OwnerId=1, ItemName="Book" }, new Item { OwnerId=2, ItemName="Chain Mail" }, new Item { OwnerId=2, ItemName="Excalibur" }, new Item { OwnerId=3, ItemName="Bubbles" }, new Item { OwnerId=3, ItemName="Gold" } }; // Create a new, anonymous composite result for person id=2. var compositeResult = from p in people join i in items on p.PersonId equals i.OwnerId where p.PersonId == 2 orderby i.ItemName descending select new { OwnerName = p.PersonName, OwnedItem = i.ItemName }; // The query doesn't evaluate until you iterate through the query or convert it to a list Console.WriteLine("[" + compositeResult.GetType().Name + "]"); // Convert to a list and loop through it. var compositeList = compositeResult.ToList(); Console.WriteLine("[" + compositeList.GetType().Name + "]"); foreach (var o in compositeList) { Console.WriteLine("\t[" + o.GetType().Name + "] " + o.OwnerName + " - " + o.OwnedItem); } Console.ReadKey(); } } } The output of the program is below: [WhereSelectEnumerableIterator`2] [List`1] [<>f__AnonymousType1`2] Arthur - Excalibur [<>f__AnonymousType1`2] Arthur - Chain Mail

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  • Interesting links week #1

    - by erwin21
    Below a list of interesting links that I found this week: Frontend: 10 Tips for Optimizing Web Form Submission Usability 10 Valuable Tips and Tricks for Designing HTML Emails 8 useful sites for web developers Development: Mono for Android Other: 7 Exciting Web Development Trends for 2011 Interested in more interesting links follow me at twitter http://twitter.com/erwingriekspoor

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