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  • How do I reuse a state machine in a slightly different way?

    - by JoJo
    Problem I have a big state machine. The design requirements of the project have changed such that I need to re-use this state machine in another place. All the states remain the same in this new place, but a few states run slightly different stuff. What design pattern allows me to reuse this state machine? Motivation I am building a video player. It is modeled by a state machine with these states: stopped, loading, playing, paused, crashed, and some more... This video player needs to be used on two web pages. When the player crashes on the first page, it should show an error message below. If the player crashes on the second page, the error message should appear in the center of the video and pulsate a few times.

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  • Processing a list of atomic operations, allowing for interruptions

    - by JDB
    I'm looking for a design pattern that addresses the following situation: There exists a list of tasks that must be processed. Tasks may be added at any time. Each task is wholly independent from all other tasks. The order in which tasks are processed has no effect on the overall system or on the tasks themselves. Every task must be processed once and only once. The "main" process which launches the task processors may start and stop without warning. When stopped, the "main" process loses all in-memory data. Obviously this is going to involve some state, but are there any design patterns which discuss where and how to maintain that state? Are there any relevant anti-patterns? Named patterns are especially helpful so that we can discuss this topic with other organizations without having to describe the entire problem domain.

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  • Is it okay to have many Abstract classes in your application?

    - by JoseK
    We initially wanted to implement a Strategy pattern with varying implementations of the methods in a commmon interface. These will get picked up at runtime based on user inputs. As it's turned out, we're having Abstract classes implementing 3 - 5 common methods and only one method left for a varying implementation i.e. the Strategy. Update: By many abstract classes I mean there are 6 different high level functionalities i.e. 6 packages , and each has it's Interface + AbstractImpl + (series of Actual Impl). Is this a bad design in any way? Any negative views in terms of later extensibility - I'm preparing for a code/design review with seniors.

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  • When dealing with a static game board, what are some methods to make it more interesting?

    - by Ólafur Waage
    Let's say you have a game board that you look at. It does not move but there is some action going on. For example Chess, Checkers, Solitaire. The game I'm working on is not one of these but it's a good reference. What are some methods you can apply to the game or the design that increases the appeal of the game to the user? Of course you can make it prettier but what are some other methods you can use? For example: Visual cues, game design changes, user interface arrangement, etc.

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  • Necessary Infrastructure for large project with many components communicating through IPCs

    - by jluzwick
    I have a fairly in depth question which probably doesn't have an exact answer. As a software engineer, I am usually tasked with working on a program or project with minimal understanding of how other components or programs in the project interact with each other. When one program fails in a sea of multiple components and processes, what infrastructure elements are necessary to ensure that the problem can be accurately tracked to the violating application? More specifically, what infrastructure elements should be necessary for this large project and which are optional but very helpful. One such example I can think of is some form of a common logging infrastructure that allows for a developer or tester to easily browse through a log that contains numerous components for messages that might allude to the culprit program along with a "trail" of what happened before the issue occurred. I'm thinking of something similar to Androids alogcat tool. These necessary infrastructure elements should be language-agnostic. While these elements should be understood by all engineers on the team in question, which elements should be understood at great detail by the technical system engineers and what should the individual software engineers be responsible for adding to their tools to allow for such infrastructures to take hold? Please feel free to ask for clarification if something does not make sense as I understand this question is very broad and needs some refinement. I will refine as necessary from the answers and comments I receive. Thanks for any help!

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  • FY15 Global Partner Kickoff Registration Now Open! June 25 & 26

    - by Roxana Babiciu
    Register today for OPN’s FY15 Global Partner Kickoff! During this year’s live webcast – Rich Geraffo, SVP, Worldwide Alliances & Channels, Oracle – will shed light around Oracle’s vision, strategy and opportunities for the upcoming fiscal year. You’ll also have a chance to hear from other Oracle executives, thought leaders and partners! EMEA Partner KickOff: June 25th, 7:00am PDT / 3:00pm BST LAD Partner KickOff: June 25th, 9:00am PDT / 1:00pm BDST NAS Partner KickOff: June 25th, 11:00am PDT JAPAN Partner KickOff: June 25th, 6:00pm PDT / June 26th, 9:00am JST APAC Partner KickOff: June 25th, 8:00pm PDT / June 26th, 11:00am SGT & 8:30am IST Once registered, watch + participate in the live webcast via the OPN homepage or OPN Facebook page on the day of the event.

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  • Oracle Becomes Second Largest Software Company In The World

    - by Roxana Babiciu
    Quarterly results are in, and the news is great! Oracle has surpassed IBM in software sales and moved into the #2 slot. Over the last four quarters, Oracle reported software revenue of $27.8 billion to IBM's $25.7 billion for its last four quarters. "We will continue to develop innovative software products and related cloud services in pursuit of becoming number one," said Oracle President and CFO Safra Catz. Read more.

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  • Using "public" vars or attributes in class calls, functional approach

    - by marw
    I was always wondering about two things I tend to do in my little projects. Sometimes I will have this design: class FooClass ... self.foo = "it's a bar" self._do_some_stuff(self) def _do_some_stuff(self): print(self.foo) And sometimes this one: class FooClass2 ... self.do_some_stuff(foo="it's a bar") def do_some_stuff(self, foo): print(foo) Although I roughly understand the differences between functional and class approaches, I struggle with the design. For example, in FooClass the self.foo is always accessible as an attribute. If there are numerous calls to it, is that faster than making foo a local variable that is passed from method to method (like in FooClass2)? What happens in memory in both cases? If FooClass2 is preferred (ie. I don't need to access foo) and other attributes inside do not change their states (the class is executed once only and returns the result), should the code then be written as a series of functions in a module?

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  • Nov.13th Live Partnercast: Topics Include Communications Industry, CX Updates

    - by Roxana Babiciu
    Join the next Live PartnerCast at partners.oracle.com on Wednesday, November 13th at 10:00AM PT. In addition to a review of the latest news happening around the OPN community, interviews with Oracle experts will discuss the following topics: Communications updates around the Acme Packet and Tekelec acquisitions Primavera updates around the Skire and Instantis acquisitions CX updates focusing on Oracle SRM (Social Relationship Management) Learn more about OPN PartnerCasts.

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  • Advice on approaching a significant rearrangement/refactoring?

    - by Prog
    I'm working on an application (hobby project, solo programmer, small-medium size), and I have recently redesigned a significant part of it. The program already works in it's current state, but I decided to reimplement things to improve the OO design. I'm about to implement this new design by refactoring a big part of the application. Thing is I'm not sure where to start. Obviously, by the nature of a rearrangement, the moment you change one part of the program several other parts (at least temporarily) break. So it's a little 'scary' to rearrange something in a piece of software that already works. I'm asking for advice or some general guidelines: how should I approach a significant refactoring? When you approach rearranging large parts of your application, where do you start? Note that I'm interested only in re-arranging the high-level structure of the app. I have no intention of rewriting local algorithms.

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  • iOS app with a lot of text

    - by rdurand
    I just asked a question on StackOverflow, but I'm thinking that a part of it belongs here, as questions about design pattern are welcomed by the faq. Here is my situation. I have developed almost completely a native iOS app. The last section I need to implement is all the rules of a sport, so that's a lot of text. It has one main level of sections, divided in subsections, containing a lot of structured text (paragraphs, a few pictures, bulleted/numbered lists, tables). I have absolutely no problem with coding, I'm just looking for advice to improve and make the best design pattern possible for my app. My first shot (the last one so far) was a UITableViewController containing the sections, sending the user to another UITableViewController with the subsections of the selected section, and then one strange last UITableViewController where the cells contain UITextViews, sections header help structure the content, etc. What I would like is your advice on how to improve the structure of this section. I'm perfectly ready to destroy/rebuild the whole thing, I'm really lost in my design here.. As I said on SO, I've began to implement a UIWebView in a UIViewController, showing a html page with JQuery Mobile to display the content, and it's fine. My question is more about the 2 views taking the user to that content. I used UITableViewControllers because that's what seemed the most appropriate for a structured hierarchy like this one. But that doesn't seem like the best solution in term of user experience.. What structure / "view-flow" / kind of presentation would you try to implement in my situation? As always, any help would be greatly appreciated! Just so you can understand better the hierarchy, with a simple example : -----> Section 1 -----> SubSection 1.1 -----> Content | -----> SubSection 1.2 -----> Content | -----> SubSection 1.3 -----> Content | | | UINavigationController -------> Section 2 -----> SubSection 2.1 -----> Content | -----> SubSection 2.2 -----> Content | -----> SubSection 2.3 -----> Content | -----> SubSection 2.4 -----> Content | -----> SubSection 2.5 -----> Content | -----> Section 3 -----> SubSection 3.1 -----> Content -----> SubSection 3.2 -----> Content |------------------| |--------------------| |-------------| 1 UITableViewController 3 UITableViewControllers 10 UIViewControllers (3 rows) (with different with a UIWebView number of rows)

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  • HTML/CSS plagiarism

    - by luqita
    Hi!! I'm facing an issue here. A customer asked me to copy an exact site, and even though I'm trying to convince him of going for a new design he does not accept it. He loves this design so much (on a side note it's horrible and outdated, but I wouldn't say that to him!) It's been a couple of weeks since we are discussing this and I don't know what to do. Do you have similar experiences? I don't want to lose the customer, he pays well and his jobs are really easy. At the same time, I don't want to put my signature on someone else's work. Any suggestions? Similar experiences? Thank you!

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  • Oracle Subscribes To The Big Data Journal: So Can You!

    - by Roxana Babiciu
    Oracle Product Development has funded access to the Big Data Journal for all Oracle employees. Big Data is a highly innovative, open-access, peer-reviewed journal of world-class research, exploring the challenges and opportunities in collecting, analyzing, and disseminating vast amounts of data. This includes data science, big data infrastructure and analytics, and pervasive computing. Register here to receive Big Data articles online or sign up for the table of content alert or the RSS feed.

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  • EMEA OPN Partner Specialization Awards - ????????????? ??????!

    - by [email protected]
      ????????? ?????? ????? ????????? - ?????? ????? ??????????? ????????? Oracle OPN Specialized.  ?? ???? ??????????? ??? EMEA OPN Partner Specialization Awards 2010, ??? ????????? ????? ???????? ?????? ???????? 2010 ????, ? ?????????? ???? ?????????, ????????????? ???? ????????????? ?? ????? ??????????? ????????? OPN Specialized,  ? ??????? ? ???????? ? ????????? ??????????:

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  • how to compile a program with gtkmozembed.h

    - by ganapati hegde
    Hi, i have written a program under ubuntu, in which i include gtkmozembed.h. I am facing a problem in compiling the program.Below is the simplest form of a program which uses gtkmozembed. #include <gtk/gtk.h> #include <stdio.h> #include <gtkmozembed.h> int main(){ GtkWidget *mozEmbed; mozEmbed = gtk_moz_embed_new(); return 0; } Eventhough, the above program is doing nothing, compiling that program is a lot for me... I am trying to comile the above program like below gcc `pkg-config --libs --cflags gtk+-2.0` test.c -o test and it is giving the following error... error: gtkmozembed.h: No such file or directory I can understand, something else has to be added to the above gcc line,so that the compiler can find the gtkmozembed.h, but not getting what is that, 'something'...Looking for someone's help..Thank you...

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  • How to prevent "This program might not have installed correctly" messages on Vista

    - by Jason
    I have a product setup executable that copies some files to the user's hard drive. It's not a typical installer in the normal sense (it doesn't add anything to the Start Menu or Program Files folders). Each time the setup program is run on Vista, after the exe terminates, Vista produces a task dialog: This program might not have installed correctly Reinstall using recommended settings This program installed correctly Is there a function I need to call from the exe or registry entry to set, to indicate to the operating system that the program installed correctly (or to at least supress this message)? Related questions: http://stackoverflow.com/questions/1069135/this-program-might-not-have-installed-correctly-message-in-windows-7-rc (for Windows 7-specific issues)

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