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• Unable To Get Sound Working to External Speaker on HP TouchSmart 320 on 11.04 or 11.10

  - by Schof

  This is an HP TouchSmart 320, model number 320-1200m. I'm using Ubuntu 11.04. Hardware information: root@hp320:/home/mpower# aplay -l **** List of PLAYBACK Hardware Devices **** card 0: Generic [HD-Audio Generic], device 0: STAC92xx Analog [STAC92xx Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 root@hp320:~$ cat /proc/asound/card0/codec#0 | grep Codec Codec: IDT 92HD91BXX Sound to headphone jack works properly, but sound to built-in speakers does not work. I have installed Windows, and with Windows 7 installed, all audio hardware works properly, so this isn't a hardware fault. I've looked at https://help.ubuntu.com/community/HdaIntelSoundHowto and have been unable to find my card in http://www.kernel.org/doc/Documentation/sound/alsa/HD-Audio-Models.txt . I have tried adding almost every conceivable model in the line "options snd-hda-intel model=MODEL" line I added to /etc/modprobe.d/alsa-base.conf. Update 2011-11-09 2:31 PM PST: I've gone to Control Center - Sound Preferences to attempt settings that make sound work. The "Hardware" tab shows one device: "Internal Audio 1 Output / 1 Input Analog Stereo Duplex." There are two output profiles listed in the selection box at the bottom of the tag: Analog Stereo Duplex and Analog Stereo Output. Neither cause sound to emit from the speakers. I've also run alsamixer on the command-line and ensured that everything is set to maximum and nothing is muted. Update 2011-11-09 5:15 PM PST: I've replicated the exact same symptoms in 11.10. Update 2011-11-10 11:31 AM PST: I've filed a bug in launchpad: https://launchpad.net/ubuntu/+source/alsa-driver/+bug/888703

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• Making Modular, Reusable and Loosely Coupled MVC Components

  - by Dusan

  I am building MVC3 application and need some general guidelines on how to manage complex client side interaction between my components. Here is my definition of one component in general way: Component which has it's own controller, model and view. All of the component's logic is placed inside these three parts and component is sort of "standalone", it contains it's own form, data needed for interaction, updates itself with Ajax and so on. Beside this internal logic and behavior of the component, it needs to be able to "Talk" to the outside world. By this I mean it should provide data and events (sort of) so when this component gets embedded in pages can notify other components which then can update based on the current state and data. I have an idea to use client ViewModel (in java-script) which would hookup all relevant components on page and control interaction between them. This would make components reusable, modular - independent of the context in which they are used. How would you do this, I am a bit stuck as I do not know if this is a good approach and there is a technical possibility to achieve this using java-script/jquery. The confusing part is about update via Ajax, how to ensure that component is properly linked to ViewModel when component is Ajax updated (or even worse removed or dynamically added). Also, how should this ViewModel be constructed and which technicalities to use here and in components to work as synergy??? On the web, I have found the various examples of the similar approach, but they are oversimplified (even for dummies) or over specific and do not provide valuable resource or general solution for this kind of implementation. If you have some serious examples it would be, also, very helpful. Note: My aim is to make interactions between many components on the same page simpler and more robust and elegant.

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• Keep getting smbd errors, but apport asks questions I can't answer

  - by Steve Kroon

  What I want to know below is where to bug report the poor series of questions I'm being asked... Every time I reboot (at least), I get a crash dialog ("Sorry, Ubuntu 12.04 has experienced an internal error"). Clicking on show details shows the problem is with smbd, but the rest of the trace does not appear. When I wish to continue to send a bug report, I am told I will be asked a series of questions in a window titled "Apport". The first question asks: How would you best describe your setup? -I am running a Windows File Server -I am connecting to a Windows File Server. Since I am doing both, I have no idea which to choose. In any case, selecting one leads to the next question: Did this used to work properly with a previous release? -No -Yes But I never tried to use Samba in a previous release, so I can't seriously answer this. After picking an option here, I get more questions in a similar vein. Surely there should be "I don't know/I haven't tried" options, even if they simply mean you can't submit a useful bug report.

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• Battery not recognized on my laptop (and it recognizes my laptop as a desktop)

  - by AZorin

  I have installed Ubuntu (both 10.10 and 11.04 pre-release) on my laptop but my battery is not recognized and it is detected as a desktop system rather than a laptop. I have tried to get the output of cat /proc/acpi/battery/BAT1/state but the directory doesn't exist. I have tried another guide to paste the battery info into this directory but it doesn't allow me to do that and says that the directory doesn't exist, even though I'm trying to make it. I tried it in root Nautilus and even on an install of Lubuntu (with a root file manager) but it still failed to budge. I really don't know what to do as I have tried all the guides on the internet that I could find. Is there any way to change the configuration file(s) that detect the internal hardware of the computer. The /proc directory is a temporary RAM directory afaik. Is there a directory where that data is stored permanently and where the RAM reads if you know what I mean? Thanks in advance. AZorin This issue has been reported as bug #764513.

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• What is an Enterprise Resource Planning (ERP) System?

  In order to understand what an Enterprise Resource Planning System is let us look at a classic American kids snack, the Rice Krispy Treat if we conceptually view the treat as a company’s internal applications as a whole.  Furthermore we can view a company’s departmentalized software applications as the theoretical Rice Krispies in the treat. In addition, the Rice Krispies consist of a combination of ingredients that be broken down into data, user interfaces and business logic. Next, we have the margarine or butter that is used to help the marshmallows bind with the Rice Krispies; this role in our conceptual view is taken by a data source typically as a relational database management system. Finally we have the melted marshmallows which act as the ERP software that connects all of the individual departmental software applications in to one unified system that allows all user one unified system to interact with all of the individual dispersed systems. An example of this would be if a customer places an order with a telephone operator and once the orders is processed an employee in the shipping department can see the order ready for fulfillment on his order screen. The ERP acts a go between for various independent departmental systems so that they can integrate with one another.

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• Financial institutions build predictive models using Oracle R Enterprise to speed model deployment

  - by Mark Hornick

  See the Oracle press release, Financial Institutions Leverage Metadata Driven Modeling Capability Built on the Oracle R Enterprise Platform to Accelerate Model Deployment and Streamline Governance for a description where a "unified environment for analytics data management and model lifecycle management brings the power and flexibility of the open source R statistical platform, delivered via the in-database Oracle R Enterprise engine to support open standards compliance." Through its integration with Oracle R Enterprise, Oracle Financial Services Analytical Applications provides "productivity, management, and governance benefits to financial institutions, including the ability to: Centrally manage and control models in a single, enterprise model repository, allowing for consistent management and application of security and IT governance policies across enterprise assets Reuse models and rapidly integrate with applications by exposing models as services Accelerate development with seeded models and common modeling and statistical techniques available out-of-the-box Cut risk and speed model deployment by testing and tuning models with production data while working within a safe sandbox Support compliance with regulatory requirements by carrying out comprehensive stress testing, which captures the effects of adverse risk events that are not estimated by standard statistical and business models. This approach supplements the modeling process and supports compliance with the Pillar I and the Internal Capital Adequacy Assessment Process stress testing requirements of the Basel II Accord Improve performance by deploying and running models co-resident with data. Oracle R Enterprise engines run in database, virtually eliminating the need to move data to and from client machines, thereby reducing latency and improving security"

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• New Dell Vostro 3550 will not boot into Live CD

  - by rich97

  I've been trying to install Ubuntu and/or it's derivatives on my new Dell Vostro 3550 but I'm finding it impossible to boot into the live CD environment. Here are the things I've already tried: Booting from multiple versions of multiple distributions (Ubuntu 10.10, Ubuntu 11.04, Mint 11, Mint 10) Booting from a Live USB created with unetbootin, the Linux Mint startup disk creator, the universal USB creator and dd of=linuxmint.***.iso if if=/dev/sdx. Burning a CD and booting from the internal CD drive. In the case of the USB keys with the latest versions of Ubuntu it gets to the page where I can select a boot option, but after selecting an option the screen goes black, even the back light turns off. With the older distributions the screen stays on but it starts loading and then just hangs. The CDs don't even try to boot. It starts spinning but then falls back to the default Windows install. The only way I've got it to work so far is with Wubi, but that's hardly ideal. I'd like to have two separate physical partitions with a /home and /. Any help is appreciated. Thank you.

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• Moving all UI logic to Client Side?

  - by Mag20

  Our team originally consisted of mostly server side developers with minimum expertise in Javascript. In ASP.NET we used to write a lot of UI logic in code-behind or more recently through controllers in MVC. A little while ago 2 high level client side developers joined our team. They can do in HTMl/CSS/Javascript pretty much anything that we could previously do with server-side code and server-side web controls: Show/hide controls Do validation Control AJAX refreshing So I started to think that maybe it would be more efficient to just create a high level API around our business logic, kinda like Amazon Fulfillment API: http://docs.amazonwebservices.com/fws/latest/APIReference/, so that client side developers would fully take over the UI, while server side developers would only concentrate on business logic. So for ordering system you would have a high level API like: OrderService.asmx CreateOrderResponse CreateOrder(CreateOrderRequest) AddOrderItem AddPayment - SubmitPayment - GetOrderByID FindOrdersByCriteria ... There would be JSON/REST access to API, so it would be easy to consume from client-side UI. We could use this API for both internal UI development and also for 3-rd parties to create their own applications. With advances in Javascript and availability of good client side developers, is it a good time to get rid of code-behind/controllers and just concentrate on developing high level APIs (ala Amazon) that client side developers can consume?

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• Can I install new version of Ubuntu in spair RAIDed partition with unetbootin

  - by artfulrobot

  I have Ubuntu 11.04 running on my home desktop which has 2 hard drives mirrored by RAID. The drives are partitioned with a big data partition, a swap partition and a couple of 20Gb partitions for OSes, one is 11.04 which is in use, and the other is kept spare for installing a later version. Which is what I'd like to do now. The idea of a 2nd partition for new OS is that I can try it, and if it's problematic, I can boot back into the original one - the machine is shared with others, so I need it to stay available! I have had horrible problems with software RAID after using a Live USB stick - basically it messes up the internal numbering of the RAID drives or something, anyway, the result is you can't boot after using it :-( and have to spend ages re-assembling the arrays, trying to remember grub commands etc etc. Quite a shocker when you consider booting from a Live USB is supposed not to affect the existing system. As I'm installing in a RAIDed disc, I would typically use the Alternative install (sad to hear that this is going to be dropped in future). However, I think I might be able to use unetbootin to trick the system into working on top of the existing system that understands RAID, with the normal ISO? If unetbootin loads from drives that are already understood to be RAIDED, then presumably it will only see md0... instead of sda, sdb... and as long as I don't need to repartition (I don't) it should be fine, right? Or is that just plain foolishness? Please tell me before I end up with a dead system (again!)

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• NetBeans 7.1 RC1 now available - JavaFX 2, Enhanced Java Editor, Improved JavaEE, WebLogic 12 support

  - by arungupta

  NetBeans 7.1 RC1 is now available! What's new in NetBeans 7.1 ? Support for JavaFX 2 Full compile/debug/profile development cycle Many editor enhancements Deployment tools  Customized UI controls using CSS3 Enhanced Java editor Upgrade projects completely to JDK 7 Import statement organizer Rectangular block selection Getters/Setters included in refactoring Java EE  50+ CDI improvements RichFaces4 and ICEFaces2 component libraries EJB Timer creation wizard Code completion for table, column, and PU names CSS3, GUI Builder, Git, Maven3, and several other features listed at New and Noteworthy Download and give us your feedback using NetBeans Community Acceptance Testing by Dec 7th. Check out the latest tutorials. To me the best part was creating a Java EE 6 application, deploying on GlassFish, and then re-deploying the same application by changing the target to Oracle WebLogic Server 12c (internal build). And now see the same application deployed to both the servers: Don't miss the Oracle WebLogic Server 12c Launch Event on Dec 1. You can provide additional feedback about NetBeans on mailing lists and forums, file reports, and contact us via Twitter. The final release of NetBeans IDE 7.1 is planned for December.

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• SD Card only mounted after a reboot

  - by hattenn

  I have a Kingston 2GB MicroSD and I plug it in via an inconix MicroSD Adapter to the internal card reader of my Samsung N210 Netbook with Ubuntu 10.10, but it doesn't show up. Only if I reboot the system when the card's plugged in it shows up. Why does it need a reboot for mounting? sudo fdisk -l gives the output below. But I can only see the drive when I reboot the computer while the card's plugged. Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9a5a7990 Device Boot Start End Blocks Id System /dev/sda1 1 1959 15728640 27 Unknown Partition 1 does not end on cylinder boundary. /dev/sda2 * 1959 1972 102400 7 HPFS/NTFS /dev/sda3 1972 18992 136718750 83 Linux /dev/sda4 18992 19458 3738625 5 Extended /dev/sda5 18992 19458 3738624 82 Linux swap / Solaris Disk /dev/sdb: 1973 MB, 1973420032 bytes 60 heads, 59 sectors/track, 1088 cylinders Units = cylinders of 3540 * 512 = 1812480 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 1 1089 1927100+ 6 FAT16

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• Who should be the architect in an agile project?

  - by woni

  We are developing the agile way for a few months now and I have some troubles understanding the agile manifesto as interpreted by my colleagues. The project we are developing is a framework for future projects and will be reused many times in the next years. Code is only written to fulfill the needs of the current user story. The product owner tells us what to do, but not how to do it. What would be right, in my opinion, because he is not implicitly a programmer. The project advanced and in my eyes it messed up a little bit. After I recognized an assembly that was responsible for 3 concerns (IoC-Container, communication layer and project internal things), I tried to address this to my colleagues. They answered that this would be the result of applying YAGNI, because know one told them to respect that functionalities have to be split up in different assemblies for further use. In my opinion no one has to tell us that we should respect the Separation of Concerns principle. On the other side, they mentioned to prefer YAGNI over SoC because it is less effort to implement and therefore faster and cheaper. We had changing requirements a lot at the beginning of the project and ended up in endless refactoring sessions, because to much has to be adapted. Is it better to make such rather simple design decisions up front, even there is no need in the current situation, or do we have to change a lot in the later progress of the project?

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• Can't install libglib2.0-dev

  - by Joachim Pileborg

  Since Handbrake can't be installed in Oneiric, I decided to try and build it from source instead. The build is interrupted because it complains glib is not installed, so I thought I better install the glib development package. But I cant: $ sudo aptitude install -V libglib2.0-dev The following NEW packages will be installed: libglib2.0-dev{b} [2.30.0-0ubuntu4] 0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded. Need to get 1 775 kB of archives. After unpacking 8 831 kB will be used. The following packages have unmet dependencies: libglib2.0-dev: Depends: libglib2.0-0 (= 2.30.0-0ubuntu4) but 2.31.0-0ubuntu1~oneiric1 is installed. Depends: libglib2.0-bin (= 2.30.0-0ubuntu4) but 2.31.0-0ubuntu1~oneiric1 is installed. Internal error: the solver Install(libglib2.0-bin 2.30.0-0ubuntu4 <libglib2.0-dev 2.30.0-0ubuntu4 -> {libglib2.0-bin 2.30.0-0ubuntu4 libglib2.0-bin 2.30.0-0ubuntu4}>) of a supposedly unresolved dependency is already installed in step 237 Aptitude the suggest a solution that involves removing basically all libraries, including libc. How do I install the glib development package?

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• Webcam doesn't work in Ubuntu 12.10

  - by Kzhi

  I have Gembird cam68ut. On my Ubuntu 12.10 it shows black screen in cheese and guvcview. I tested it in win7, it works fine. Here what I found: It is a uvc compliant camera, I checked on the site: 18ec:3299 USB 2.0 PC Camera (model number QC3231) ArkMicro This webcam is report by lsusb: Bus 001 Device 004: ID 18ec:3299 Arkmicro Technologies Inc. Here is the output of dmesg | tail: uvcvideo: Found UVC 1.00 device USB2.0 PC CAMERA (18ec:3299) uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround. input: USB2.0 PC CAMERA as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.0/input/input17 usbcore: registered new interface driver uvcvideo USB Video Class driver (1.1.1) When I run cheese (or guvcview), here what I get in terminal: libv4l2: error turning on stream: No space left on device (cheese:11797): cheese-WARNING **: Internal data flow error. I tried it on different usb slots with the same results The Webcam's microphone works, I can record audio with it Guys, any thoughts on what can be done to make it work?

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• Uses of persistent data structures in non-functional languages

  - by Ray Toal

  Languages that are purely functional or near-purely functional benefit from persistent data structures because they are immutable and fit well with the stateless style of functional programming. But from time to time we see libraries of persistent data structures for (state-based, OOP) languages like Java. A claim often heard in favor of persistent data structures is that because they are immutable, they are thread-safe. However, the reason that persistent data structures are thread-safe is that if one thread were to "add" an element to a persistent collection, the operation returns a new collection like the original but with the element added. Other threads therefore see the original collection. The two collections share a lot of internal state, of course -- that's why these persistent structures are efficient. But since different threads see different states of data, it would seem that persistent data structures are not in themselves sufficient to handle scenarios where one thread makes a change that is visible to other threads. For this, it seems we must use devices such as atoms, references, software transactional memory, or even classic locks and synchronization mechanisms. Why then, is the immutability of PDSs touted as something beneficial for "thread safety"? Are there any real examples where PDSs help in synchronization, or solving concurrency problems? Or are PDSs simply a way to provide a stateless interface to an object in support of a functional programming style?

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• Philosophy behind the memento pattern

  - by TheSilverBullet

  I have been reading up on memento pattern from various sources of the internet. Differing information from different sources has left me in confusion regarding why this pattern is actually needed. The dofactory implementation says that the primary intention of this pattern is to restore the state of the system. Wiki says that the primary intention is to be able to restore the changes on the system. This gives a different impact - saying that it is possible for a system to have memento implementation with no need to restore. And that ability of restore is a feature of this. OODesign says that It is sometimes necessary to capture the internal state of an object at some point and have the ability to restore the object to that state later in time. Such a case is useful in case of error or failure. So, my question is why exactly do we use this one? Is it to save previous states - or to promote encapsulation between the Caretaker and the Memento? Why is this type of encapsulation so important? Edit: For those visiting, check out this Implementation!

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• Failed Project: When to call it?

  - by Dan Ray

  A few months ago my company found itself with its hands around a white-hot emergency of a project, and my entire team of six pulled basically a five week "crunch week". In the 48 hours before go-live, I worked 41 of them, two back to back all-nighters. Deep in the middle of that, I posted what has been my most successful question to date. During all that time there was never any talk of "failure". It was always "get it done, regardless of the pain." Now that the thing is over and we as an organization have had some time to sit back and take stock of what we learned, one question has occurred to me. I can't say I've ever taken part in a project that I'd say had "failed". Plenty that were late or over budget, some disastrously so, but I've always ended up delivering SOMETHING. Yet I hear about "failed IT projects" all the time. I'm wondering about people's experience with that. What were the parameters that defined "failure"? What was the context? In our case, we are a software shop with external clients. Does a project that's internal to a large corporation have more space to "fail"? When do you make that call? What happens when you do? I'm not at all convinced that doing what we did is a smart business move. It wasn't my call (I'm just a code monkey) but I'm wondering if it might have been better to cut our losses, say we're not delivering, and move on. I don't just say that due to the sting of the long hours--the company royally lost its shirt on the project, plus the intangible costs to the company in terms of employee morale and loyalty were large. Factor that against the PR hit of failing to deliver a high profile project like this one was... and I don't know what the right answer is.

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• SSAS Compare version 1.0 released

  - by Red Gate Software BI Tools Team

  We’re pleased to announce that SSAS Compare version 1.0 has been released as a free tool. Version 1.0 includes: Comparisons of live databases and XMLA or Analysis Services Project files MDX syntax diffs and highlighting Server comparisons Deployment wizard with summaries of scripted actions Bug fixes and engine and UI refinements We’ve tested it on as many cube configurations as we could find (not just good old AdventureWorks!), but we can’t provide support for free tools — so if you’re reliant on SSAS Compare for your cube deployment, use it at your own risk. See the user license agreement in the installer for more details. SSAS Compare’s come a long way from its humble beginnings as an internal tool first developed for Red Gate’s own BI developers. Today’s SSAS Compare is now much more stable — not to mention much easier to use — and something the team is proud to have released with Red Gate’s name on. Next: Deployment Manager We’re working on integrating SSAS Compare cube deployment with our new Deployment Manager tool, so you’ll be able to create cube deployment scripts and automate the deployment process, too.  We’re documenting the process in a white paper we’ll publish online in the next week. Thank you! Thanks to all the SSAS Compare users out there. Without your feedback, we could never have produced such a stable product so quickly. We hope you continue to find useful. See you in Deployment Manager!  

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• Data Center Modernization: Harness the power of Oracle Exalogic and Exadata with PeopleSoft

  - by Michelle Kimihira

  Author: Latha Krishnaswamy, Senior Manager, Exalogic Product Management   Allegis Group - a Hanover, MD-based global staffing company is the largest privately held staffing company in the United States with more than 10,000 internal employees and 90,000 contract employees. Allegis Group is a $6+ billion company, offering a full range of specialized staffing and recruiting solutions to clients in a wide range of industries.   The company processes about 133,000 paychecks per week, every week of the year. With 300 offices around the world and the hefty task of managing HR and payroll, the PeopleSoft system at Allegis  is a mission-critical application. The firm is in the midst of a data center modernization initiative. Part of that project meant moving the company's PeopleSoft applications (Financials and HR Modules as well as Custom Time & Expense module) to a converged infrastructure.     The company ran a proof of concept with four different converged architectures before deciding upon Exadata and Exalogic as the platform of choice.   Performance combined with High availability for running mission-critical payroll processes drove this decision.  During the testing on Exadata and Exalogic Allegis applied a particular (11-F) tax update in production environment. What job ran for roughly six hours completed in less than 1.5 hours. With additional tuning the second run of the Tax update 11-F reduced to 33 minutes - a 90% improvement!     Not only that, the move will help the company save money on middleware by consolidating use of Oracle licensing in a single platform.   Summary With a modern data center powered by Exalogic and Exadata to run mission-critical PeopleSoft HR and Financial Applications, Allegis is positioned to manage business growth and improve employee productivity. PeopleSoft applications run on engineered systems platform minimizing hardware and software integration risks. Additional Information Product Information on Oracle.com: Oracle Fusion Middleware Follow us on Twitter and Facebook Subscribe to our regular Fusion Middleware Newsletter

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• How to efficiently protect part of an application with a license

  - by Patrick

  I am working on an application that has many functional parts. When a customer buys the application, he buys the standard functionality, but he can also buy some additional elements of the application for an additional price. All of the elements are part of the same application executable. A license key is used to indicate which of the elements should be accessible in the application. Some of the elements can be easily disabled if the user didn't pay for it. These are typically the modules that you can access via the application's menu. However, some elements give more problems: What if a part of the data model is related to an optional part? Do I build up these data structures in my application so the rest of my application can just assume they're always there? Or do I don't build them, and add checks in the rest of may application? What if some optional part is still useful to perform some internal tasks, but I don't want to expose it to the user externally? What if the marketing responsible wants to make a standard part now an optional part? In all of my application I assume that that part is present, but if it becomes optional, I should add checks on it everywhere in the application. I have some ideas on how to solve some of the problems (e.g. interfaces with dual implementations: one working implementation, and one that is activated if the optional part is not activated). Do you know of any patterns that can be used to solve this kind of problem? Or do you have any suggestions on how to handle this licensing problem? Thanks.

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• A Quarter Century of SPARC

  - by kemer

  You might have missed an interesting milestone: the 25th anniversary of SPARC. Twenty-five years! Almost 40% of my life: humbling, maybe a little scary. When I joined Sun Microsystems in 1988, SPARC was just starting to shake things up. The next year we introduced the SPARCstation 1, which had basically triple the performance of our Motrolla-based Sun–3 systems. Not too long after that, our competition began a campaign of “SPARC is dead.” We really distressed them with our success, in spite of our small size. “It won’t last.” “It can’t last!” So they told themselves. For a stroll down memory lane take a look at this page. I remember the sales meeting we had in Atlanta to internally announce the SPARCstation 1. Sun hadn’t really hit the big times, yet. Our much bigger competitors viewed us as an ill-mannered pest, certain of our demise. And, why wouldn’t they be certain: other startups more our size, such as Apollo (remember them?), Silicon Graphics (they fought the good fight!), and the incredibly cool Symbolics are memories. Wait! There was also a BIG company, DEC, who scoffed at us: they are history, too. In fact, we really upset them with what was supposed to be an internal-only video production that was a take-off on Bruce Lee movies, in which we battled the evil Doctor DEC – complete with computer mice (or is that “mouses”?) wielded like nun chucks with the new SPARCstation 1 somehow in the middle of everything. The memory is vivid, but the details hazy. After all, that was almost a quarter century ago. So, here’s to Oracle’s SPARC: still going strong after all these years. – Kemer

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• Do you leverage the benefits of the open-closed principle?

  - by Kaleb Pederson

  The open-closed principle (OCP) states that an object should be open for extension but closed for modification. I believe I understand it and use it in conjunction with SRP to create classes that do only one thing. And, I try to create many small methods that make it possible to extract out all the behavior controls into methods that may be extended or overridden in some subclass. Thus, I end up with classes that have many extension points, be it through: dependency injection and composition, events, delegation, etc. Consider the following a simple, extendable class: class PaycheckCalculator { // ... protected decimal GetOvertimeFactor() { return 2.0M; } } Now say, for example, that the OvertimeFactor changes to 1.5. Since the above class was designed to be extended, I can easily subclass and return a different OvertimeFactor. But... despite the class being designed for extension and adhering to OCP, I'll modify the single method in question, rather than subclassing and overridding the method in question and then re-wiring my objects in my IoC container. As a result I've violated part of what OCP attempts to accomplish. It feels like I'm just being lazy because the above is a bit easier. Am I misunderstanding OCP? Should I really be doing something different? Do you leverage the benefits of OCP differently? Update: based on the answers it looks like this contrived example is a poor one for a number of different reasons. The main intent of the example was to demonstrate that the class was designed to be extended by providing methods that when overridden would alter the behavior of public methods without the need for changing internal or private code. Still, I definitely misunderstood OCP.

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• Balancing dependency injection with public API design

  - by kolektiv

  I've been contemplating how to balance testable design using dependency injection with providing simple fixed public API. My dilemma is: people would want to do something like var server = new Server(){ ... } and not have to worry about creating the many dependencies and graph of dependencies that a Server(,,,,,,) may have. While developing, I don't worry too much, as I use an IoC/DI framework to handle all that (I'm not using the lifecycle management aspects of any container, which would complicate things further). Now, the dependencies are unlikely to be re-implemented. Componentisation in this case is almost purely for testability (and decent design!) rather than creating seams for extension, etc. People will 99.999% of the time wish to use a default configuration. So. I could hardcode the dependencies. Don't want to do that, we lose our testing! I could provide a default constructor with hard-coded dependencies and one which takes dependencies. That's... messy, and likely to be confusing, but viable. I could make the dependency receiving constructor internal and make my unit tests a friend assembly (assuming C#), which tidies the public API but leaves a nasty hidden trap lurking for maintenance. Having two constructors which are implicitly connected rather than explicitly would be bad design in general in my book. At the moment that's about the least evil I can think of. Opinions? Wisdom?

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• How can I remove duplicate icons for "launched" java programs in the launcher?

  - by Tim

  When launching java programs (like IntelliJ IDEA and Crashplan) in Natty's Unity launcher, duplicate icons are shown (see image). For IntelliJ I created the .desktop file, for Crashplan the .desktop file is supplied with the application. Is there something that can be changed in the .desktop files (or somewhere else) that can prevent this from occurring? I couldn't find a bug report for unity itself but programs like Gnome-Do/Docky have bug reports and had to make internal changes to their applications to prevent this. In this image the 1st icon is the one created from the .desktop file and the second icon is after launching it. Second icon disappears when closing the application. Custom IntelliJ .desktop file #!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Icon[en_US]=/opt/idea/bin/idea128.png Name[en_US]=IntelliJ IDEA Exec=/opt/idea/bin/idea.sh Name=IntelliJ IDEA Icon=/opt/idea/bin/idea128.png StartupNotify=true Crashplan provide .desktop file [Desktop Entry] Version=1.0 Encoding=UTF-8 Name=CrashPlan Categories=; Comment=CrashPlan Desktop UI Comment[en_CA]=CrashPlan Desktop UI Exec=/usr/local/crashplan/bin/CrashPlanDesktop Icon=/usr/local/crashplan/skin/icon_app_64x64.png Hidden=false Terminal=false Type=Application GenericName[en_CA]=

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• What to expect when creating a style guide?

  - by ted.strauss

  My organization would like to create a full fledged style guide that will be applicable to internal & external web sites, print advertising, trade show design, and overall branding. This article lays out the scope we're aiming for, and has links to many great examples style guide PDFs. The goal is to create a style guide comparable to one of these. I'd like to set realistic expectations within my organization for creating this document. So I have a few of questions pertaining to this: We don't have design staff. Should we be looking for a design firm or freelancer to come in for a 2-6 month contract, or do we need a longer commitment? If we do go with a firm or freelancer, would the pay-scale be comparable to typical design work, or is a style guide a higher order of work? How long should it take a pro to create a style guide? To make estimates more concrete, let's say web only, including all custom graphics. Any red flags to watch out for? (Compare: a new coder who fails to use css properly would be a red flag.)

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