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  • Why is TDD not working here?

    - by TobiMcNamobi
    I want to write a class A that has a method calculate(<params>). That method should calculate a value using database data. So I wrote a class Test_A for unit testing (TDD). The database access is done using another class which I have mocked with a class, let's call it Accessor_Mockup. Now, the TDD cycle requires me to add a test that fails and make the simplest changes to A so that the test passes. So I add data to Accessor_Mockup and call A.calculate with appropriate parameters. But why should A use the accessor class at all? It would be simpler (!) if the class just "knows" the values it could retrieve from the database. For every test I write I could introduce such a new value (or an if-branch or whatever). But wait ... TDD is more. There is the refactoring part. But that sounds to me like "OK, I can do this all with a big if-elseif construct. I could refactor it using a new class ... but instead I make use of the DB accessor and do this in a totally different way. The code will not necessarily look better afterwards but I know I WANT to use the database".

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  • Performance-Driven Development

    - by BuckWoody
    I was reading a blog yesterday about the evils of SELECT *. The author pointed out that it's almost always a bad idea to use SELECT * for a query, but in the case of SQL Azure (or any cloud database, for that matter) it's especially bad, since you're paying for each transmission that comes down the line. A very good point indeed. This got me to thinking - shouldn't we treat ALL programming that way? In other words, wouldn't it make sense to pretend that we are paying for every chunk of data - a little less for a bit, a lot more for a BLOB or VARCHAR(MAX), that sort of thing? In effect, we really are paying for that. Which led me to the thought of Performance-Driven Development, or the act of programming with the goal of having the fastest code from the very outset. This isn't an original title, since a quick Bing-search shows me a couple of offerings from Forrester and a professional in Israel who already used that title, but the general idea I'm thinking of is assigning a "cost" to each code round-trip, be it network, storage, trip time and other variables, and then rewarding the developers that come up with the fastest code. I wonder what kind of throughput and round-trip times you could get if your developers were paid on a scale of how fast the application performed... Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Architecting Python application consisting of many small scripts

    - by Duke Dougal
    I am building an application which, at the moment, consists of many small Python scripts. Each Python script processes items from one Amazon SQS queue. Emails come into an initial queue and are processed by a script and typically the script will do a small unit of processing (for example, parse email and store some database fields), then an item will be placed on the next queue for further processing, until eventually the email has finished going through the various scripts and queues. What I like about this approach is that it is very loosely coupled. However, I'm not sure how I should implement live. Should I make each script a daemon which is constantly polling it's inbound queue for things to do? Or should there be some overarching orchestration program or process? Or maybe I should not have lots of small Python scripts but one large application? Specific questions: How should I run each of these scripts - as a daemon with some sort or restart monitor to restart them in case they stop for any reason? If yes, should I have some program which orchestrates this? Or is the idea of many small script not a good one, would it make more sense to have a larger python program which contains all the functionality and does all the queue polling and execution of functionality for each queue? What is the current preferred approach to daemonising Python scripts? Broadly I would welcome any comments or opinions on any aspect of this. thanks

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  • XSLT is not the solution you're looking for

    - by Jeff
    I was very relieved to see that Umbraco is ditching XSLT as a rendering mechanism in the forthcoming v5. Thank God for that. After working in this business for a very long time, I can't think of any other technology that has been inappropriately used, time after time, and without any compelling reason.The place I remember seeing it the most was during my time at Insurance.com. We used it, mostly, for two reasons. The first and justifiable reason was that it tweaked data for messaging to the various insurance carriers. While they all shared a "standard" for insurance quoting, they all had their little nuances we had to accommodate, so XSLT made sense. The other thing we used it for was rendering in the interview app. In other words, when we showed you some fancy UI, we'd often ditch the control rendering and straight HTML and use XSLT. I hated it.There just hasn't been a technology hammer that made every problem look like a nail (or however that metaphor goes) the way XSLT has. Imagine my horror the first week at Microsoft, when my team assumed control of the MSDN/TechNet forums, and we saw a mess of XSLT for some parts of it. I don't have to tell you that we ripped that stuff out pretty quickly. I can't even tell you how many performance problems went away as we started to rip it out.XSLT is not your friend. It has a place in the world, but that place is tweaking XML, not rendering UI.

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  • Restrict SSL access for some paths on a apache2 server

    - by valmar
    I wanted to allow access to www.mydomain.com/login through ssl only. E.g.: Whenever someone accessed http://www.mydomain.com/login, I wanted him to be redirect to https://www.mydomain.com/login so it's impossible for him/her to access that site without SSL. I accomplished this by adding the following lines to the virtual host for www.mydomain.com on port 80 in /etc/apache2/sites-available/default: RewriteEngine on RewriteCond %{SERVER_PORT} ^80$ RewriteRule ^/login(.*)$ https://%{SERVER_NAME}/login$1 [L,R] RewriteLog "/var/log/apache2/rewrite.log" Now, I want to restrict using SSL for www.mydomain.com. That means, whenever someone accessed https://www.mydomain.com, I want him to be redirected to http://www.mydomain.com (for performance reasons). I tried this by adding the following lines to the virtual host of www.mydomain.com on port 443 in /etc/apache2/sites-available/default-ssl: RewriteEngine on RewriteCond %{SERVER_PORT} ^443$ RewriteRule ^/(.*)$ http://%{SERVER_NAME}/$1 [L,R] RewriteLog "/var/log/apache2/rewrite.log" But when I now try to access www.mydomain.com/login, I get an error message that the server has caused to many redirects. That does make sense. Obviously, the two RewriteRules are playing ping-pong against each other. How could I work around this?

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  • CSS and HTML incoherences when declaring multiple classes

    - by Cesco
    I'm learning CSS "seriously" for the first time, but I found the way you deal with multiple CSS classes in CSS and HTML quite incoherent. For example I learned that if I want to declare multiple CSS classes with a common style applied to them, I have to write: .style1, .style2, .style3 { color: red; } Then, if I have to declare an HTML tag that has multiple classes applied to it, I have to write: <div class="style1 style2 style3"></div> And I'm asking why? From my personal point of view it would be more coherent if both could be declared by using a comma to separate each class, or if both could be declared using a space; after all IMHO we're still talking about multiple classes, in both CSS and HTML. I think that it would make more sense if I could write this to declare a div with multiple classes applied: <div class="style1, style2, style3"></div> Am I'm missing something important? Could you explain me if there's a valid reason behind these two different syntaxes?

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  • Move a SQL Azure server between subscriptions

    - by jamiet
    In September 2011 I published a blog post SSIS Reporting Pack v0.2 now available in which I made available the credentials of a sample database that one could use to test SSIS Reporting Pack. That database was sitting on a paid-for Azure subscription and hence was costing me about £5 a month - not a huge amount but when I later got a free Azure subscription through my MSDN Subscription in January 2012 it made sense to migrate the database onto that subscription. Since then I have been endeavouring to make that move but a few failed attempts combined with lack of time meant that I had not yet gotten round to it.That is until this morning when I heard about a new feature available in the Azure Management Portal that enables one to move a SQL Azure server from one subscription to another. Up to now I had been attempting to use a combination of SSIS packages and/or scripts to move the data but, as I alluded, I ran into a few roadblocks hence the ability to move a SQL Azure server was a godsend to me. I fired up the Azure Management Portal and a few clicks later my server had been successfully migrated, moreover the name of the server doesn't change and neither do any credentials so I have no need to go and update my original blog post either. Its easy to be cynical about SQL Azure (and I maintain a healthy scepticism myself) but that, my friends, is cool!You can read more about the ability to move SQL Azure servers between subscriptions from the official blog post Moving SQL Azure Servers Between Subscriptions.@Jamiet

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  • Should I include HTML markup in my JSON response?

    - by Mike M. Lin
    In an e-commerce site, when adding an item to a cart, I'd like to show a popup window with the options you can choose. Imagine you're ordering an iPod Shuffle and now you have to choose the color and text to engrave. I'd like the window to be modal, so I'm using a lightbox populated by an Ajax call. Now I have two options: Option 1: Send only the data, and generate the HTML markup using JavaScript What's nice about this is that it trims down the Ajax request to the bear minimum and doesn't mix the data with the markup. What's not so great about this is that now I need to use JavaScript to do my rendering, instead of having a template engine on the server-side do it. I might be able to clean up the approach a bit by using a client-side templating solution. Option 2: Send the HTML markup What's good about this is that I can have the same server-side templating engine I'm using for the rest of my rendering tasks (Django), do the rendering of the lightbox. JavaScript is only used to insert the HTML fragment into the page. So it clearly leaves the rendering to the rendering engine. Makes sense to me. But I don't feel comfortable mixing data and markup in an Ajax call for some reason. I'm not sure what makes me feel uneasy about it. I mean, it's the same way every web page is served up -- data plus markup -- right?

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  • "wrong fs type, bad option, bad superblock" error while mounting FAT Drives

    - by cshubhamrao
    I am unable to mount any fat32 or fat16 formatted usb disks under Ubuntu 13.10. The thing here to note is that it is happening only with fat formatted Disks. ntfs, ext formatted external usb disks work well (I tried formatting the same with ext4 and it worked) While mounting via nautilus: Error while mounting from terminal: root@shubham-pc:~# mount -t vfat /dev/sdc1 /media/shubham/n mount: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so As suggested by the error: Output from dmesg | tail root@shubham-pc:~# dmesg | tail [ 3545.482598] scsi8 : usb-storage 1-1:1.0 [ 3546.481530] scsi 8:0:0:0: Direct-Access SanDisk Cruzer 1.26 PQ: 0 ANSI: 5 [ 3546.482373] sd 8:0:0:0: Attached scsi generic sg3 type 0 [ 3546.483758] sd 8:0:0:0: [sdc] 15633408 512-byte logical blocks: (8.00 GB/7.45 GiB) [ 3546.485254] sd 8:0:0:0: [sdc] Write Protect is off [ 3546.485262] sd 8:0:0:0: [sdc] Mode Sense: 43 00 00 00 [ 3546.488314] sd 8:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 3546.499820] sdc: sdc1 [ 3546.503388] sd 8:0:0:0: [sdc] Attached SCSI removable disk [ 3547.273396] FAT-fs (sdc1): IO charset iso8859-1 not found Output from fsck.vfat: root@shubham-pc:~# fsck.vfat /dev/sdc1 dosfsck 3.0.16, 01 Mar 2013, FAT32, LFN /dev/sdc1: 1 files, 1/1949978 clusters All normal Tried re-creating the whole partition table and then formatting as fat32 but to no avail so the possibility of corrupted drive is ruled out. Tried the same with around 4 Disks or so and all have the same things

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  • UI message passing programming paradigm

    - by Ronald Wildenberg
    I recently (about two months ago) read an article that explained some user interface paradigm that I can't remember the name of and I also can't find the article anymore. The paradigm allows for decoupling the user interface and backend through message passing (via some queueing implementation). So each user action results in a message being pased to the backend. The user interface is then updated to inform the user that his request is being processed. The assumption is that a user interface is stale by definition. When you read data from some store into memory, it is stale because another transaction may be updating the same data already. If you assume this, it makes no sense to try to represent the 'current' database state in the user interface (so the delay introduced by passing messages to a backend doesn't matter). If I remember correctly, the article also mentioned a read-optimized data store for rendering the user interface. The article assumed a high-traffic web application. A primary reason for using a message queue communicating with the backend is performance: returning control to the user as soon as possible. Updating backend stores is handled by another process and eventually these changes also become visible to the user. I hope I have explained accurately enough what I'm looking for. If someone can provide some pointers to what I'm looking for, thanks very much in advance.

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  • Go Big or Go Home

    - by user12601034
    For those who don’t know, Oracle sponsors a group called “OWL” – Oracle Women’s Leadership - and the purpose of the group is to create local and global opportunities that support, educate and empower current and future women leaders at Oracle. This week, I had the opportunity to attend the Denver OWL roadshow, and I was really impressed with the quality of speakers and interactions that I experienced. One theme that arose throughout the day was that of “Lean In.” In a nutshell, “Lean In” requires you to take advantage of the opportunities that you’re given. One of my personal mantras is “Go big or go home."  That is, if you’re not willing to give it your all, don’t do it at all. Regardless of how you phrase it, it’s a life lesson that I believe needs to be tossed in our face every so often simply, if for no other reason, to get our attention. You are given a finite amount of time in your life; in your job role; in your interactions with others. Do you make the most of the opportunities given to you every day? Or do you believe that life just happens, and you have to deal with whatever is handed to you? I have a challenge for you. Set aside any concerns or fears you have about something and Lean In. Make the most of an opportunity presented to you…or make your own opportunity! If you start with just one thing, you’ll start building a mindset to make the most of additional opportunities. Not only will you be better for leaning in, but I’m betting that those around you will be better for it as well.

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  • Why are two indicator-network versions being worked on?

    - by Daniel Rodrigues
    Some months ago, on the road to Ubuntu Maverick, a new system indicator, network (with connman as a backend), started to be developed. The plan was to get it into UNE and release it with no notifcation area. Unfortunately it didn't make it into the final version. However, continued efforts are still being made to improve it, and I'm getting regular updates. From a blueprint from the last UDS, I read that the plan was to ship no notification area and only indicators. For that, it was defined that nm-applet (backend: NetworkManager) should be ported to the appindicator library. Today I discovered that those efforts are going on and a initial version is available for testing, available from Matt Trudel PPA (Natty only). So, my questions is, to whoever has the necessary info: wouldn't it be easier to join efforts and concentrate the work in just one version (probably NetworkManager backend, as that's the official plan), instead of breaking those efforts apart and hampering both testing and developing? Both indicators are being developed by Canonical engineers, and that really doesn't make much sense. So, any Canonical engineer willing to clarify this?

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  • Trying to format drive fails

    - by david
    since I will be doing an internship for which i need to use Windows software, I have decided to ruin my day trying to remove my Ubuntu 12.04, install Win XP SP3 (since the DualBoot theme from ubuntu suggests to first install Windows and then Ubuntu, for problems with the bootloader if you do it the other way around) and then reinstall Ubuntu 12.04 since I would like to keep using it as my primary operating system, using WinXP exclusively for the internship. Other than that, I would like to have a partition for the data, which can be used by both Ubuntu and Windows. So now, I have used the disk utility run from an ubuntu-live cd to format my drive with Master Boot Record (being conscious of the fact that this way I will lose all my data, which I have saved on an external drive before, and that my Ubuntu won't work anymore afterwards), creating partitions for Windows (NTFS), personal data (FAT, since as far as I know both Ubuntu and Windows can deal with this), a Swap partition for Linux, and one partition for Ubuntu (ext4); trying to install Win XP from cd gives me a blue screen, which stops the setup and telling me to remove all recently installed drives and to run CHKDSK. So I thought, that maybe Windows doesn't like pre-partitioned drives for its installation and thus I need to re-format my hard drive in order to have a completely "new" drive, which I can then, during the Windows-installation, partition in order to create the partitions I need. Trying to do this, though, the disk-utility run from the live-CD gives me this warning: Error creating partition table: helper exited with exit code 1: In part_create_partition_table: device_file=/dev/sda, scheme=0 got it got disk committed to disk BLKRRPART ioctl failed for /dev/sda: Device or resource busy I do not understand why it tells me that the hard-drive is busy, because, as stated above, I am doing all this from a live-CD. Thus, my questions are: How can I resolve the error given by the disk utility? Does it make sense to use four partitions in the way mentioned above? And if not so, which partitions should I create? Can I, theoretically, partition my drive from an Ubuntu live-cd in order to create the partitions I want and to install first Windows and then Ubuntu? Thanks for any help, David

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  • PHP remote development workflow: git, symfony and hudson

    - by user2022
    I'm looking to develop a website and all the work will be done remotely (no local dev server). The reason for this is that my shared hosting company a2hosting has a specific configuration (symfony,mysql,git) that I don't want to spend time duplicating when I can just ssh and develop remotely or through netbeans remote editing features. My question is how can I use git to separate my site into three areas: live, staging and dev. Here's my initial thought: public_html (live site and git repo) testing: a mirror of the site used for visual tests (full git repo) dev/ticket# : git branches of public_html used for features and bug fixes (full git repo) Version Control with git: Initial setup: cd public_html git init git add * git commit -m ‘initial commit of the site’ cd .. git clone public_html testing mkdir dev Development: cd /dev git clone ../testing ticket# all work is done in ./dev/ticket#, then visit www.domain.com/dev/ticket# to visually test make granular commits as necessary until dev is done git push origin master:ticket# if the above fails: merge latest testing state into current dev work: git merge origin/master then try the push again mark ticket# as ready for integration integration and deployment process: cd ../../testing git merge ticket# -m "integration test for ticket# --no-ff (check for conflicts ) run hudson tests visit www.domain.com/testing for visual test if all tests pass: if this ticket marks the end of a big dev sprint: make a snapshot with git tag git push --tags origin else git push origin cd ../public_html git checkout -f (live site should have the latest dev from ticket#) else: revert the merge: git checkout master~1; git commit -m "reverting ticket#" update ticket# that testing failed with the failure details Snapshots: Each major deployment sprint should have a standard name and should be tracked. Method: git tag Naming convention: TBD Reverting site to previous state If something goes wrong, then revert to previous snapshot and debug the issue in dev with a new ticket#. Once the bug is fixed, follow the deployment process again. My questions: Does this workflow make sense, if not, any recommendations Is my approach for reverting correct or is there a better way to say 'revert to before x commit'

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  • Technology stack for CRUD apps [closed]

    - by Panoy
    In the past years, I have been using VB6 + MySQL when developing CRUD applications. Now I am currently learning how to develop web applications, as my plan is to go through the "browser/web app" path every time I build a CRUD app. I'm leaning on Ruby on Rails + MySQL/PostgreSQL/any NoSQL database now. I would like to know what other technology/tools stack to include in my architecture when developing these web apps? I'm asking your inputs with regards to the UI, database and reporting stack/toolset. Currently I have these in mind: UI = jQuery, jQueryUI (add your comments for other good UI stack) database = will be considering NoSQL or simply but RDBMS reporting tool = i'm clueless here Will it also make sense to use NoSQL database on these CRUD applications? I am assuming that the data would balloon later on. The desktop/native app route is an option only if there is a requirement, that in my limited experience, believes that a web app can't solve. Like for example those imaging apps/document forms and point-of-sale systems. I believe that web apps are gaining ground now and I find it most fun and intriguing to play and experiment with them. Please share your suggestions!

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  • links for 2011-03-02

    - by Bob Rhubart
    Oracle Technology Network Architect Day: Denver Registration is now open. Sessions will cover IT Optimization and consolidation, cloud computing, the evolving role of enterprise IT, and more. (tags: oracle otn entarch event denver) SOA Suite Integration: Part 2: A basic BPEL process (The Shorten Spot) The latest post in Anthony's Shorten's series about SOA Suite integration with Oracle Utilities Application Framework. (tags: oracle otn soa bpel soasuite) ADF: How to create web service based ADF pages The first in promised series of three posts on the topic by Marianne Horsch. (tags: oracle soa webservices adf) David Butler: MDM Poised for Growth (Oracle Master Data Management) David says: "Businesses are talking about the need to fix master data before they can successfully move forward on SOA initiatives. And the growing demands for compliance continue to be a major driver." (tags: oracle otn mdm) Cloud governance is about more than security | The Pervasive Data Center - CNET News Legal and regulatory procedures, transparency, service levels, indemnification, and more are all part of a broader governance landscape that requires IT to work closely with business users. Read this blog post by Gordon Haff on The Pervasive Data Center. (tags: ping.fm) Senthilkumar Rajendran's Blog: Horizontal Scaling OBIEE 11g (tags: ping.fm) InfoQ: Searching Without Objectives Kenneth O. Stanley considers that innovation is stifled when we are strictly following a high goal, and we would progress more when we are inclined to discovery rather than following an objective. (tags: ping.fm) InfoQ: Brownfield Software - Industrial Waste or Business Fertilizer? Josh Graham addresses 10 myths related to working on legacy software, attempting to prove that one can make good use of legacy code without having to rewrite the entire thing. (tags: ping.fm)

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  • links for 2010-06-17

    - by Bob Rhubart
    Live Webcast: Alcatel-Lucent Delivers Modern Customer User Experience with New Interactive Portal Saeed Hosseiniyar (CIO of Alcatel-Lucent’s Enterprise Products Group) and Andy MacMillan  (VP of Product Management for Oracle’s Enterprise 2.0 Solutions) discuss how  Alcatel used Oracle’s Enterprise 2.0 solutions to build a community and  give customers a rich interactive experience. (tags: oracle otn webcast enterprise2.0) Up Next, More Browser Tools for WebCenter Sharing | The AppsLab On the heels of our bookmarklet for sharing to WebCenter, today we were designing another other way to help people interact with WebCenter from the browser (tags: ping.fm oracle e20) BPM 11gR1 now available on Amazon EC2 "This is a fully configured image which requires absolutely no installation and lets you get hands on experience with the software within minutes," says  Prasen Palvankar. "This image has all the required software installed and configured." (tags: oracle otn bpm amazon ec2) Webcast: Introducing Next-Generation Business Process Management Hasan Rizvi, Senior Vice President, Oracle Product Development, discusses innovations in Oracle's new BPM Suite 11g in this webcast. (tags: oracle otn webcast bpm) Tim Pinchetti: Architecture as a navigation system "Metaphors have value in communicating different aspects of architecture. So I’d like to explore different perspectives on architecture using different metaphors, starting with: navigation!" -- Tim Pinchetti  (tags: architecture enterprisearchitecture entarch) Oracle Fusion Middleware Innovation Awards 2010 Nominate your organization today for a chance to be recognized for your cutting-edge solution using Oracle Fusion Middleware products. (tags: oracle openworld fusionmiddleware innovation) Oracle OpenWorld Key Financials Sessions Theresa Hickman with highlights on the some of the 70 financial sessions scheduled for Oracle Open World,  crossing all the financials product lines: e-Business Suite, JD Edwards, PeopleSoft, and Fusion. (tags: oracle otn openworld financials) Liberate Your Laptops! The Return of Virtual Developer Day Details on the upcoming Oracle Technology Network Virtual Developer Day - Tuxedo. (English-language version scheduled for July 27th.)  (tags: oracle tuxedo virtualbox otn) Webcast: Effective Smart Data Grid Management David Haak (Accenture), Brad Williams (Oracle), and Chris Foretich (Southern) discuss the strategy behind and the application of smart data grid technology in this on-demand webcast.  (tags: ping.fm oracle bpm)

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  • Sprite and Physics components or sub-components?

    - by ashes999
    I'm taking my first dive into creating a very simple entity framework. The key concepts (classes) are: Entity (has 0+ components, can return components by type) SpriteEntity (everything you need to draw on screen, including lighting info) PhysicsEntity (velocity, acceleration, collision detection) I started out with physics notions in my sprite component, and then later removed them to a sub-component. The separation of concerns makes sense; a sprite is enough information to draw anything (X, Y, width, height, lighting, etc.) and physics piggybacks (uses the parent sprite to get X/Y/W/H) while adding physics notions of velocity and collisions. The problem is that I would like collisions to be on an entity level -- meaning "no matter what your representation is (be it sprites, text, or something else), collide against this entity." So I refactored and redirected collision handling from entities to sprite.physics, while mapping and returning the right entity on physics collisions. The problem is that writing code like this.GetComponent<SpriteComponent>().physics is a violation of abstraction. Which made me think (this is the TLDR): should I keep physics as a separate component from sprites, or a sub-component, or something else? How should I share data and separate concerns?

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  • US GAAP and IFRS Convergence May Be Delayed Even More

    - by Theresa Hickman
    Yesterday, on March 10, the Financial Accounting Standards Board (FASB) met to discuss the changes in financial statement presentation. Over the last six months, the FASB and IASB have been working feverishly to converge US GAAP and IFRS standards to meet the 2011 deadline. In March alone, the standards-setters met eight times. Many people fear that this accelerated pace is compromising the quality of the end product and that maybe they should slow down and do their due diligence. According to WG&L Accounting & Compliance Alert Checkpoint 3/10/2010, (which requires a subscription to view the full article) "Some statement preparers and investors who advise the FASB believe that the process would be better served if it was slowed down so that more attention could be paid to quality." "Should 2011 be looked at as a line in the sand?" asked Joan Amble, executive vice president and corporate comptroller for American Express Co. "We don't think that due process should be compromised for the due date," concurred Lewis Dulitz, vice president of accounting policies and research for medical products supplier Covidien plc. I personally have mixed emotions about this. On one hand, I have been growing impatient with how slow the US has jumped on the IFRS band wagon. On the other hand, being the conservative that I am and knowing this convergence will be costly and disruptive to businesses, I would prefer to be safe than sorry and get it right the first time.

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  • Can defect containment metrics be readily applied at an organizational level when there is only a consistant organizational process framework?

    - by Thomas Owens
    Defect containment metrics, such as total defect containment effectiveness (TDCE) and phase containment effectiveness (PCE), can be used to give a good indicator of the quality of the process. TDCE captures the defects that are captured at some point between requirements and the release of a product into the field, indicating the overall effectiveness of the entire process to find and remove defects. PCE provides more detail at each phase of the software development life cycle and how the defect detection and removal techniques are working. Applying these metrics makes sense at a level where you have a well-defined process and methodology for product development, often a project. However, some organizations provide a process framework that is tailored at the project level. This process framework would include the necessary guidance for meeting certifications (ISO9001, CMMI), practices for incorporating known good techniques (agile methods, Lean, Six Sigma), and requirements for legal or regulatory reasons. However, the specific details of how to gather requirements, design the system, produce the software, conduct test, and release are left to the product development teams. Is there any effective way to apply defect containment metrics at an organizational level when only a process framework exists at the organizational level? If not, what might be some ideas for metrics that can be distilled from each project (each using a tailored process that fits into the organizational process framework) that captures defect containment metrics to discuss the ability of the process to find and remove defects? The end goal of such a metric would be to consolidate the defect containment practices of a large number of ongoing projects and report to management. The target audience would be people in roles such as the chief software engineer and the chief engineer (of all engineering disciplines) for the organization. Although project specific data would be available, the idea is to produce something that quantifies the general effectiveness of all tailored processes across all ongoing projects. I would suspect that this data would also be presented as part of CMMI, ISO, or similar audits to demonstrate process quality.

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  • COM+, DTC, and 80070422

    - by Chris Miller
    One of our  "packaged" software bits that accesses my servers is going through an upgrade right now.  Apparently this software requires DTC to be installed on my SQL Server, and able to accept remote connections.  So I look up how to do that in the knowledge base: http://support.microsoft.com/?kbid=555017 And immediately hit a roadblock.  The DTC components aren't showing up in my Component Services console.  The entire console's acting weird (well, weirder than usual) and when I go into the console and click "Options" it insists on having a timeout entered, and when I enter one, close the box, and go back, the setting's gone again and I'm required to re-enter it.  Lots of weirdness, and no DTC tab.  If you open the COM+ folders, you immediately get error 80070422. After a lot of searching I was looking through the Services listing on the box (after restarting DTC for the twelfth time) and saw that "Com+ System Application" was disabled.  I set it to manual, rebooted the box (test server) and everything started working. So, if you're trying to follow those instructions and discover that the Component Services tool is acting odder than usual, make sure that service isn't disabled.

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  • Correct For Loop Design

    - by Yttrill
    What is the correct design for a for loop? Felix currently uses if len a > 0 do for var i in 0 upto len a - 1 do println a.[i]; done done which is inclusive of the upper bound. This is necessary to support the full range of values of a typical integer type. However the for loop shown does not support zero length arrays, hence the special test, nor will the subtraction of 1 work convincingly if the length of the array is equal to the number of integers. (I say convincingly because it may be that 0 - 1 = maxval: this is true in C for unsigned int, but are you sure it is true for unsigned char without thinking carefully about integral promotions?) The actual implementation of the for loop by my compiler does correctly handle 0 but this requires two tests to implement the loop: continue: if not (i <= bound) goto break body if i == bound goto break ++i goto continue break: Throw in the hand coded zero check in the array example and three tests are needed. If the loop were exclusive it would handle zero properly, avoiding the special test, but there'd be no way to express the upper bound of an array with maximum size. Note the C way of doing this: for(i=0; predicate(i); increment(i)) has the same problem. The predicate is tested after the increment, but the terminating increment is not universally valid! There is a general argument that a simple exclusive loop is enough: promote the index to a large type to prevent overflow, and assume no one will ever loop to the maximum value of this type.. but I'm not entirely convinced: if you promoted to C's size_t and looped from the second largest value to the largest you'd get an infinite loop!

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  • Do or can robots cause considerable performance issues?

    - by Anicho
    So the question in the title is exactly what I am trying to find out. My case is: At work we are in a discussion with team members who seem to think bots will cause us problems relating to performance when running on our services website. Out setup: Lets say I have site www.mysite.co.uk this is a shop window to our online services which sit on www.mysiteonline.co.uk. When people search in google for mysite they see mysiteonline.co.uk as well as mysite.co.uk. Cases against stopping bots crawling: We don't store gb's of data publicly available on the web Most friendly bots, if they were to cause issues would have done so already In our instance the bots can't crawl the site because it requires username & password Stopping bots with robot .txt causes an issue with seo (ref.1) If it was a malicious bot, it would ignore robot.txt or meta tags anyway Ref 1. If we were to block mysiteonline.co.uk from having robots crawl this will affect seo rankings and make it inconvenient for users who actively search for mysite to find mysiteonline. Which we can prove is the case for a good portion of our users.

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  • Does TDD really work for complex projects?

    - by Amir Rezaei
    I’m asking this question regarding problems I have experienced during TDD projects. I have noticed the following challenges when creating unit tests. Generating and maintaining mock data It’s hard and unrealistic to maintain large mock data. It’s is even harder when database structure undergoes changes. Testing GUI Even with MVVM and ability to test GUI, it takes a lot of code to reproduce the GUI scenario. Testing the business I have experience that TDD works well if you limit it to simple business logic. However complex business logic is hard to test since the number of combinations of tests (test space) is very large. Contradiction in requirements In reality it’s hard to capture all requirements under analysis and design. Many times one note requirements lead to contradiction because the project is complex. The contradiction is found late under implementation phase. TDD requires that requirements are 100% correct. In such cases one could expect that conflicting requirements would be captured during creating of tests. But the problem is that this isn’t the case in complex scenarios. I have read this question: Why does TDD work? Does TDD really work for complex enterprise projects, or is it practically limit to project type?

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  • How to set TextureFilter to Point to make example Bloom filter work?

    - by Mr Bell
    I have simple app that renders some particles and now I am trying to apply the bloom shader from the xna samplers ( http://create.msdn.com/en-US/education/catalog/sample/bloom ) to it, but I am running into this exception: "XNA Framework HiDef profile requires TextureFilter to be Point when using texture format Vector4." When the BloomComponent tries to end the sprite batch in the DrawFullscreenQuad method: spriteBatch.Begin(0, BlendState.Opaque, SamplerState.PointWrap, null, null, effect); spriteBatch.Draw(texture, new Rectangle(0, 0, width, height), Color.White); spriteBatch.End(); //<------- Exception thrown here It seems to be related to the pixel shaders that I am using to animate the particle. In a nutshell, I have a texture2d in vector4 format that holds particle positions, and another one for velocities. Here is a snippet from that area: GraphicsDevice.SetRenderTarget(tempRenderTarget); animationEffect.CurrentTechnique = animationEffect.Techniques[technique]; spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, SamplerState.PointWrap, DepthStencilState.DepthRead, RasterizerState.CullNone, animationEffect); spriteBatch.Draw(randomValues, new Rectangle(0, 0, width, height), Color.White); spriteBatch.End(); What I comment out the code that calls the particle animation pixel shaders the bloom component runs fine. Is there some state that I need to reset to make the bloom work?

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