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Articles indexed Wednesday March 21 2012

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  • Personalized Pricing

    - by David Dorf
    In past postings I've spent a fair amount of time talking about targeted promotions.  Using a complete view of the customer that includes purchase history, location history, and psychographics gleaned from social media, we can select the offer with the greatest chance of redemption.  This is done to influence shopping behavior, which might be introducing the consumer to a new product line, increasing their basket size, increasing frequency of purchases, etc. Safeway seems to be taking a slightly different approach with their personalized pricing.  In additional to offering electronic coupons and club card offers, they are also providing a personalized price for certain items based on purchase history.  So when Sally want to shop at Safeway, she first checks the "Just for U" website for three types of deals.  She starts by selecting manufacturer coupons to load into her loyalty card, then she checks the Club Card for offers like "buy one get one free." The third step is the interesting one.  Safeway will set a particular lower price for Sally good for 90 days on items she buys often.  Clearly this isn't enforcing a new behavior but rather instilling loyalty.  I would love to know exactly how they are determining the personalized price.  Of course bargain hunters can still stack the three offers so they can, for example, get their $4.99 Oatmeal for $0.72. I like this particular question and answer from their website's FAQ: My offers are not that great. Can I tell you what offers I need? That's a good idea. That functionality is not currently available, but we appreciate your input and are constantly improving our just for U program. Stay tuned for exciting enhancements! I suppose if Safeway is tracking all the purchases, they can easily determine whether the customer if profitable.  As long as the customer stays profitable, why not let them determine a few offers themselves?  Food for thought.

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  • Mobile or the Science of Programming Languages

    - by user12652314
    Just two things to share today. First is some news in the mobile computing space and a pretty cool new relationship developing with DubLabs and AT&T to enable a student-centric mobile experience for our Campus Solution customers. And second, is an interesting article shared by a friend on Research in Programming Languages related to STEM education, a key story element to my project with Americas Cup and iED, but also to our national interest

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  • QotD: Justin Kestelyn, Editor in Chief of Java Magazine on OpenJDK

    - by $utils.escapeXML($entry.author)
    Things have changed now. Java SE 7 is available, and Java SE 8 is on the way; Java developer conferences around the world are selling out in short order; Java skills are in high demand by recruiters; and the Java community is reinvigorated thanks to efforts including the OpenJDK project, the Adopt-a-JSR program, and—if I may be so bold—even this publication.Justin Kestelyn, Editor in Chief of the Java Magazine, in the opening 'from the editor' article in the magazine's March/April edition.

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  • New Feature in ODI 11.1.1.6: Enterprise Data Quality Integration

    - by Julien Testut
    Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Oracle Data Integrator 11.1.1.6.0 introduces a new Open Tool called EnterpriseDataQuality which allows ODI users to invoke an Oracle Enterprise Data Quality Job from a Package. This post will give you an overview of this new feature. Oracle Enterprise Data Quality (OEDQ) provides organizations with an integrated suite of data quality tools that offer an end-to-end solution to measure, improve, and manage the quality of data from any domain, including customer and product data. The addition of the EnterpriseDataQuality Open Tool extends the inline Data Quality capabilities of Oracle Data Integrator with Oracle Enterprise Data Quality powerful data profiling, cleansing, matching, and monitoring capabilities. The EnterpriseDataQuality Open Tool can invoke any OEDQ Job stored in a Project. This Open Tool connects to an OEDQ server using a JMX (Java Management Extensions) interface. Once installed, this Open Tool will be found under Plugins in the Package Toolbox area: This EnterpriseDataQuality Open Tool takes a couple of parameters as inputs such as the Enterprise Data Quality Job and Project names, the OEDQ hostname and JMX port etc. With the EnterpriseDataQuality Open Tool, ODI customers can now incorporate their Oracle Enterprise Data Quality processes within their Data Integration workflows. You will find instructions about how to use the Enterprise Data Quality Open Tool in the Oracle Data Integrator documentation at: Using the EnterpriseDataQuality Open Tool.You can find an overview of all the new features introduced in ODI 11.1.1.6 in the following document: ODI 11.1.1.6 New Features Overview.

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  • Welcome to the FMW Install and Admin Proactive Team Blog

    - by Daniel Mortimer
    IntroductionWelcome to the Fusion Middleware Install and Administration Proactive Support blog.  This is our first post, so let's begin by introducing ourselves and our mission. Who We AreWe are a small team of support engineers based in Europe.  Our expertise covers all matters related to the installation and administration of Oracle Application Server 10g, Oracle Fusion Middleware 11g and future versions to come. We particularly focus on core components such as the Installers and Configuration Wizards Web Tier ( Oracle HTTP Server ) OPMN Enterprise Manager Console for Application Server as well as general questions / problems relating to patching, maintenance and architecture. Our Mission Improve the customer experience Enable customers to avoid / prevent issues when working with our products Enable faster resolution of problems when they occur Our Activities Enhancement and maintenance of our knowledge base In particular, develop and maintain special content such as the Fusion Middleware Information Centers and Lifecycle Support Advisors Seek continuous improvement of the product documentation Contribute to the Fusion Middleware Support News Moderation of the "Oracle Application Server" support community Participate in the Support Advisor Webcast program Involved in the Lifecycle of diagnostic tools such as RDA and OCM User Acceptance Testing Logging of enhancements and health check ideas Provide feedback to product management / development Logging of product bugs and enhancements Suggest improvements that could be made to web sites like OTN Promote new support documents, tools via channels such as Newsletter and Social Media We hope that this blog will be a two-way communication as we are interested in feedback on what we can improve. Many suggestions we can act on immediately while others may take more time, but all of them will be acknowledged and followed up.Thank you for your time and we look forward to both informing and working with you.Postscript: Many links you will find in our blog entries will require a login to My Oracle Support. For readers who do not have a login, please accept our apologies - when and where possible we will endeavour to ensure the links will supplement rather than replace wording in the blog entries.

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  • It’s On! Oracle Open World 2012 Opens Call for Papers is Open

    - by David Hope-Ross
    Oracle OpenWorld is among the world’s largest industry events for good reason. It offers a vast array of learning and networking opportunities in one of the planet’s great cities.  And one of the key reasons for its popularity among procurement and supply chain professionals is the prominence of presentations by customers.   If you’d like to deliver a presentation based on your experience, now is the time to submit your abstract for review by the selection panel. The competition is strong: roughly 18% of entries are accepted each year from more than 3,000 submissions. Review panels are made up of experts both internal and external to Oracle. Successful submissions often (but not exclusively) focus on customer successes, how-tos, or best practices. What’s in it for you? Recognition, for one thing. Accepted sessions are publicized in the content catalog, which goes live in mid-June, and sessions given by external speakers often prove the most popular. Plus, accepted speakers get a complimentary pass to Oracle OpenWorld with access to all sessions and networking events- that could save you up to $2,595!   Be sure designate your session for inclusion in the correct track by selecting  “APPLICATIONS: Supply Chain Management” or “APPLICATIONS: Sourcing and Procurement” from the Primary Track drop down menu.   We look forward to seeing you in San Francisco!

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  • 2 New Resources Added to IT Strategies from Oracle Library

    - by Bob Rhubart
    IT Strategies from Oracle, an authorized library of guidelines and reference architectures, has just been updated to include two new documents: A Pragmatic Approach to Cloud Adoption For enterprises that seek to transform their own IT capabilities and avoid adverse disruption in the process, a structured and pragmatic approach to Cloud computing is required. This practitioner guide details a framework that can be used within any organization for developing such an approach to Cloud adoption. Oracle's Approach to Cloud Successful adoption of Cloud computing requires the definition of an approach that aligns with business drivers and operational capabilities. This is why Oracle has developed a pragmatic approach, based on experience with numerous companies, to help customers successfully adopt Cloud. This data sheet provides an executive overview of Oracle's proven approach to Cloud. These two new resources join a collection of dozens of documents covering Service-Oriented Architecture, Event-Driven Architecture, Business Process Management, and Cloud Computing. Registration is required to access the material, but it's all free.

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  • ArchBeat Link-o-Rama for 2012-03-21

    - by Bob Rhubart
    Webcast: Simplify Oracle RAC Deployment with Oracle VM event.on24.com Tuesday March 20, 2012 - 9am PT / Noon ET Learn how you can: Deploy an Oracle (RAC) Database environment in minutes with Oracle VM templates Create, deploy or convert existing systems into highly available cluster environments Instantly respond to changing demand by relocating resources between servers Speakers: Ronen Kofman – Product Management Director, Oracle Markus Michalewicz – Senior Principal Product Manager, Oracle Webcast: Oracle Business Intelligence Mobile event.on24.com Event Date: Wednesday, March 28, 2012 Time: 10 a.m. PT / 1 p.m. ET Speakers: Pete Manhardt – Director Enterprise Information at Smiths Group, plc Shailesh Shedge – Director BI & Analytics Practice at Ascentt Manan Goel – Director BI Product Marketing at Oracle Seth's Blog: The extraordinary software development manager sethgodin.typepad.com "Being good at programming is insufficient qualification for becoming a world class software project manager/leader," says marketing guru Seth Godin. Mismatch: Developer skills and customer demands | Floyd Teter orclville.blogspot.com "Those of us in the developer community may need to reconsider the law of supply and demand," says Oracle ACE Director Floyd Teter, "and get on with the process of matching our skills to the demands of our customers." SOA gets mobilized; mobile gets SOA-ized: survey | Joe McKendrick www.zdnet.com "Maybe mobile is the killer app for SOA that actually will convince people to adopt the architectural style." Integrating with Oracle Fusion Applications: Discovering Integration Artifacts | Rajesh Raheja rraheja.wordpress.com Rajesh Raheja briefly discusses "the ease with which integrations are now possible using standards-based technologies with enterprise applications." Chargeback and showChargeback and showback...both a 'throw back' | Tom Laszewski blogs.oracle.com Tom Laszeski discusses strategies for tracking and applying the costs of "IT services, hardware or software to the business unit in which they are used." GlassFish 4.0 Virtualization Progress - VirtualBox | The Aquarium blogs.oracle.com Want to spawn GlassFish instances as VirtualBox virtual machines? The Aquarium shares resources that will help you get it done. Thought for the Day "Spring is the time of plans and projects." — Leo Tolstoy

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  • New JavaMagazine issue (March/April) is here

    - by alexismp
    The latest edition of the JavaMagazine, Oracle's bi-monthly publication, is out with the now traditional set of wide-ranging Java topics including some Java EE/GlassFish articles. You'll learn that there's a new book on Java EE 6 - Cookbook for securing, tuning, and extending enterprise applications, have the opportunity to read Adam Bien's latest piece - Who needs AOP? as well as Julien Ponge's part 2 of Clustering and HA Made Simple with GlassFish. The JavaMagazine is a free publication. Subscriptions here.

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  • Upcoming MySQL Events in Europe

    - by Bertrand Matthelié
    @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }h2 { margin: 12pt 0cm 3pt; page-break-after: avoid; font-size: 14pt; font-family: "Times New Roman"; font-style: italic; }a:link, span.MsoHyperlink { color: blue; text-decoration: underline; }a:visited, span.MsoHyperlinkFollowed { color: purple; text-decoration: underline; }span.Heading2Char { font-family: Calibri; font-weight: bold; font-style: italic; }span.apple-style-span { }div.Section1 { page: Section1; } Oracle’s European MySQL team is active running many events during the upcoming couple of months. We hope to see you there - Register Now! Scale with MySQL Are you looking to scale with MySQL? On-premise or in the cloud? Leveraging SQL and NoSQL Access? Join us for a free Oracle seminar focusing on best practices for MySQL performance and scalability. April 25: London May 22: Berlin MySQL Enterprise Edition Workshop In this hands-on seminar we will present the MySQL Enterprise Edition management tools under guidance of Oracle’s MySQL experts providing hints and tips. May 8: Düsseldorf High Availability Solutions for MySQL Web-based and business critical applications must typically be available 24/7. In addition to being very costly due to lost revenue opportunities, downtime can be extremely detrimental to customer loyalty, and present regulatory issues if data is compromised. Join us for this seminar to better understand how to achieve high availability with MySQL. May 10: Helsinki May 23: Munich May 24: Baden-Dättwil (near Zürich)

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  • EXALYTICS - Oracle® Essbase 11.1.2.1.000 Patch Set (PS): 11.1.2.2.000

    - by Ahmed Awan
    Who should apply this patch: This PS contains defect fixes and changes that are specific to the Oracle Exalytics In-Memory box. You should install this PS only in the following circumstances: You are installing Essbase on the Exalytics In-Memory Machine, or There is an urgent need for a defect fix that is included in this PS Customers considering this PS for a platform other than the Exalytics In-Memory Machine should carefully review the list of fixed defects. If there is not a truly urgent need for a defect fix included in this PS, Oracle recommends customers install the upcoming Enterprise Performance Management (EPM) 11.1.2.2.000 release, which will contain an update, instead of this patch set. Reference: http://docs.oracle.com/cd/E26232_01/doc.11122/readme/esb_11122000_readme.html

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  • ?????? ??????????! ?Gold???? vol.3 <??>

    - by M.Morozumi
    ???ORACLE MASTER Gold Oracle Database 11g?????????????? ?????????????????????? ------------------------------- ???? Point-in-Time ?????????????????????????????????( )??????????????? ( )???????????????1????????? a.TS_PITR_OBJECTS_TO_BE_OBSOLETED b.TS_PITR_OBJECTS_TO_BE_DISAPPEARED c.TS_PITR_OBJECTS_TO_BE_DROPPED ??????????????? ------------------------------- ??:c.TS_PITR_OBJECTS_TO_BE_DROPPED ??: ???? Point-in-Time ?????????????????????????????????TS_PITR_OBJECTS_TO_BE_DROPPED ????????????????????????????????

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  • Oracle OpenWorld ?? Oracle|Sun

    - by user13137902
    Oracle|Sun @ Oracle OpenWorld Tokyo 2012 ?? Solaris?????@Oracle Develop@Tokyo 2011 ??????????????????Oracle|Sun????????????? ??????????????????????????????(^ ^;) ?????? Oracle OpenWorld Tokyo 2012 ??4?4???4?6??3??? ???????? ????? ??????????????????? ???&?????????? Oracle OpenWorld Tokyo 2012 ???? ???&????? ????????????????????????????????????? ???Exa*???????????????????????????????? ????????????????????????????? ????Oracle OpenWorld Tokyo 2012???? Oracle|Sun ?????????????????????? ??????????????? K1-014/4(?) 9:00-11:15 ENGINEERED FOR INNOVATION ??????????????????·???????? ?????? ???·??? ????·???????? ???????·????????? ???·????? ????·???????? ???·??????·?????? ?????·?????? ?????????? ??????? ??????? ?? ?? S1-014/4(?) 11:50-12:35 Oracle Engineered Systems Strategy-?????????????????????????????????????·???????? ????·????????? ????·??? S1-334/4(?) 15:20-16:05 ??????????????????????????????????????????????????????????? ????????????????? ?? ?? S1-424/4(?) 16:30-17:15 ?????Engineered Systems?????????????IT?????????????? ????????????????? ?? ? K2-014/5(?) 9:30-11:15 Extreme Innovation????·???????? ???????(CEO) ???·???? G2-014/5(?) 11:50-13:20 ??????&???????????IT??????????????·???????? ???????·????????? ???·???? S2-424/5(?) 16:30-17:15 ??UNIX??????????-SPARC SuperCluster?????????? ????????????????? ?? ? S2-534/5(?) 17:40-18:25 Oracle E-Business Suite????????????????????/??????????????????????”SPARC SuperCluster”?????????? ????????????????? ?? ?? S3-134/6(?) 13:00-13:45 ?????SNS??????????????? Sun ZFS Storage Appliance ????????????????? ???????? ?? ?? S3-214/6(?) 14:10-14:55 ???????????????????????????????????????? ???????? ????? ?? ?? ? S3-334/6(?) 15:20-16:05 ????????·????????????????????????????????????????? ???? ?????????? ?? ??(????) ?? ?? ? 1?????????????K1-01?????? ????????????????????????????????????????? ??????????????????? ??????1???????·?????????? ???????Solaris???????????? ???????????????S1-01?Engineered System??????????? S1-33?????????????????????????????????????? S1-42?????????????????????????????????? ???????·?????????K2-01?????????? ?????????????????????????? ???????????????????????????????????? ?????????????????????? ??????????????????????? ??????????????????????????? ????????Engineered System? ??????????????????????????? ??G2-01??????·???????????? ???????????????????????? ??????????????????????? S2-42??????????????? SPARC?????Engineered System???SPARC SuperCluster T4-4????????? ???????????????????????????????? S2-53?????SuperCluster???? ???????????SuperCluster??????????????? ??????????????????????????????????? ????????????Oracle Optimized Solution?????? ?????????Oracle Develop???????? ????????????ZFS Storage Appliance????3????????????? ??????????????????????????????? ?????????????????????????? ???ZFS Storage Appliance???????????????????? ????????????? ???? ?????????????? ??????????????7324????????? (?????????????????? facebook ????????????? ????????????)? ????????????????????????????????????????????

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  • Découvrez Oracle Fusion HCM lors d'un Petit Déjeuner le 10 avril 2012

    - by Kinoa
    La gestion fusionnée des talents fait partie de vos priorités ? Alors le petit déjeuner que nous organisons le 10 avril 2012 est fait pour vous ! L'équipe d'Oracle France et le groupe Des Systèmes et des Hommes-Talentys vous convie à un séminaire pour mieux comprendre les enjeux RH et les maîtriser grâce à la solution Oracle Fusion HCM. Apprenez à mieux gérer les hauts potentiels de votre société et réconciliez enfin les attentes des talents comme les exigences des Directions Générales et des DRH. Oracle Fusion HCM vous offre de nombreuses possibilités : identification et animation de la communauté talents, gestion des carrières, pilotage du vivier, plan de succession, gestion de la performance et de leur rémunération... Inscrivez-vous dès aujourd'hui pour participer à notre événement Oracle Fusion HCM. On vous attend nombreux !

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  • John Hitchcock of Pace Describes the Oracle Agile PLM Customer Experience

    John Hitchcock, Senior Manager of Configuration Management at Pace (formerly 2Wire, Inc.), sat down for an interview during Oracle's Innovation Summit with Kerrie Foy, Manager of PLM Product Marketing at Oracle. Learn why his organization upgraded to the latest version of Agile and expanded the footprint to achieve impressive savings and productivity gains across the global, networked product value-chain.

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  • REPLACENULL in SSIS 2012

    - by Davide Mauri
    While preparing my slides e demos for the forthcoming SQL Server Conference 2012 in Italy, I’ve come across a nice addition to DTS Expression language which I never noticed before and that seems unknown also to the blogosphere: REPLACENULL. REPLACENULL is the same of ISNULL in T-SQL. It’s *very* useful especially when loading a fact table of your BI solution when you need to replace unexisting reference to dimension with dummy values. Here’s an example of how it can be used (please notice that in this example I’m NOT loading a fact table): I’ve noticed that the feature was requested by fellow MVP John Welch http://connect.microsoft.com/SQLServer/feedback/details/636057/ssis-add-a-replacenull-function-to-the-expression-language So: Thanks John and Thanks SSIS Team ! Ah, btw, the Help online is here http://msdn.microsoft.com/en-us/library/hh479601(v=sql.110).aspx Enjoy!

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  • Two bugs you should be aware of

    - by AaronBertrand
    In the past 24 hours I have come across two bugs that can be quite problematic in certain environments. LPIM issue with SetFileIoOverlappedRange Last night the CSS team posted a blog entry detailing a potential issue with Lock Pages in Memory and Windows' SetFileIoOverlappedRange API. I tweeted about it at the time, but thought it could use a little more treatment. The potential symptoms can vary, but include the following (as quoted from the blog post): Wide ranging in SQL from invalid write location,...(read more)

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  • Options for Opensource license?

    - by foodil
    I am choosing a license for my open source software and I've learned about GPL, EBMS and BSD. GPL seems to be most popular one. The problems are: Would anybody kindly name a few popular opensource licenses? Since I do not see any EBMS BSD license is popular. Are there any chart or table that have list out the advantages/disadvantages of using anyone? Why is the GPL always the license developers choose from, what are its benefits? Thank you.

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  • Getting started with ClojureScript and Google Closure

    - by Andrea
    I would like to investigate whether ClojureScript, with the associated Google Closure library is a reasonable tool to build modern, in-browser, Javascript applications. My current Javascript stack consists of jQuery, Backbone and RequireJS with the possible additions of some widgets libraries like jQueryUI or KendoUI. So it will be quite a big leap (I already know how to work in Clojure, although I have little experience). What is a good roadmap to do so? Should I learn the Google Closure library first, or can I grasp it together with ClojureScript? One thing I am concerned about is the overall application structure. Backbone is rather opinionated on how to organize your application. I am not sure whether Google Closure also includes some components to help with the design of the application. And, if this is the case, I do not know how to tell whether this structure will port to ClojureScript or a ClojureScript application will require a different organization anyway, and only use - say - the widgets and DOM manipulation features of Closure.

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  • How should I evaluate new browser languages?

    - by Andrea
    In these days there are many projects whose aim is to bring new languages to the browser by compiling them to JavaScript. Among the others one can mention ClojureScript, CoffeScript, Dart, haXe, Emscripten, Amber Smalltalk. I'd like to try a few of these out, but I am not sure what I should be looking for when evaluating these languages to see if they are suitable for production. How should I evaluate a new browser language, and what are the pitfalls I should be looking for?

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  • Why hill climbing is called anytime algorithm?

    - by crucified soul
    From wikipedia, Anytime algorithm In computer science an anytime algorithm is an algorithm that can return a valid solution to a problem even if it's interrupted at any time before it ends. The algorithm is expected to find better and better solutions the more time it keeps running. Hill climbing Hill climbing can often produce a better result than other algorithms when the amount of time available to perform a search is limited, such as with real-time systems. It is an anytime algorithm: it can return a valid solution even if it's interrupted at any time before it ends. Hill climbing algorithm can stuck into local optima or ridge, after that even if it runs infinite time, the result won't be any better. Then, why hill climbing is called anytime algorithm?

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  • How to store a list of Objects that might change in future?

    - by Amogh Talpallikar
    I have set of Objects of the same class which have different values of their attributes. and I need to find the best match from a function under given scenarios out of these objects. In future these objects might increase as well. Quite similar to the way we have Color class in awt. we have some static color objects in the class with diff rgb values. But in my case say, I need to chose the suitable color out of these static ones based on certain criteria. So should I keep them in an arrayList or enum or keep them as static vars as in case of Colors. because I will need to parse through all of them and decide upon the best match. so I need them in some sort of collection. But in future if I need to add another type I will have to modify the class and add another list.add(object) call for this one and then it will violate the open-close principle. How should I go about it ?

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  • Do you think that GAE alone is enough to justify learning Python over Ruby?

    - by Cue
    Considering the fact that you don't have to get involved in setting up/buying a server or even buying a domain, do you think that fact alone is enough to choose one over the other? I don't necessarily want to work on Google App Engine, I just find it convenient when it comes to hosting/environment/etc. and wondering if that's a good enough reason to learn python. In any case, I'm not looking for a debate between python and ruby but more on Google App Engine and whether its value is enough to dictate the language you should learn.

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  • Using static methods in objects PHP - is it advantage?

    - by RePRO
    I was reading some articles and discussions on the use of static methods on objects and it struck me how much the views differ. Someone say that using static methods is an advantage. Someone says that use is a big mistake. I wonder how is it? My question is when to use static methods and when not? I would like to hear answers from experts in this field (PHP OOP). This is because I know how it really is. The following code should be analogous. Just call the static method is simpler (my opinion): <?php class A { public function write($a) { echo $a; } } class B { public static function write($a) { echo $a; } } $a = new A; $a->write(5); // 5 B::write(5); // 5 ?> Thank you.

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  • Is this kind of Design by Contract useless?

    - by Charlie Pigarelli
    I've just started informatics university and I'm attending a programming course about C(++). The programming professor prefers to teach very few things (in 3 month we have just reached the functions topic) and connect every topic with a type of programming design that somehow is similar to the Design by Contract design. Basically what he ask us to do is to write every exercise with comments Pre-conditions, Post-conditions and Invariants that should prove the correctness of each program we write. But this doesn't make any sense to me. I mean, ok: maybe writing down your thoughts prevent you from doing some mistakes, but if this is all an abstract thing, then if your program intuition is wrong you'll write your program wrong and then you'll also write pre and post conditions wrong probably auto convincing your self about its correctness. Most of the time, both me and other students have written programs that seemed ok and that had correct pre and post condition too. But at the moment of testing it was just completely wrong. I had some experience before this course of programming and I had written a lot of line of code before and I found myself comfortably with just writing a program and unit test it. It take less time to accomplish and is less "abstract" than just thinking about what every single piece of your program should do in every case (which is kinda like mentally testing it). Finally, all this pre and post conditions takes me like 80% of the total time of the exercise. It's harder to think about putting down this pre and post correct than to write the program itself. Since we are like the only course of the only university probably in the entire world that makes this things, could someone please tell me how should I manage this thing? Am I right thinking that this doesn't worth anything? Should I change university? (there are like double of the people attending that course and it seems that usually very few people passes the exam the first year). Should I convince myself it's method is right?

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