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  • What design patterns are the worst or most narrowly defined?

    - by Akku
    For every programming project, Managers with past programming experience try to shine when they recommend some design patterns for your project. I like design patterns when they make sense or if you need a scalbale solution. I've used Proxies, Observers and Command patterns in a positive way for example, and do so every day. But I'm really hesitant to use say a Factory pattern if there's only one way to create an object, as a factory might make it all easier in the future, but complicates the code and is pure overhead. So, my question is in respect to my future career and my answer to manager types throwing random pattern-names around: Which design patterns did you use, that threw you back overall? Which are the worst design patterns, that you shouldn't have a look at if it's not that only single situation where it makes sense (read: which design patterns are very narrowly defined)? (It's like I was looking for the negative reviews of an overall good product of amazon to see what bugged people most in using design patterns). And I'm not talking about Anti-Patterns here, but about Patterns that are usually thought of as "good" patterns. Edit: As some answered, the problem is most often that patterns are not "bad" but "used wrong". If you know patterns, that are often misused or even difficult to use, they would also fit as an answer.

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  • What design patters are the worst or most narrowly defined?

    - by Akku
    For every programming project, Managers with past programming experience try to shine when they recommend some design patterns for your project. I like design patterns when they make sense or if you need a scalbale solution. I've used Proxies, Observers and Command patterns in a positive way for example, and do so every day. But I'm really hesitant to use say a Factory pattern if there's only one way to create an object, as a factory might make it all easier in the future, but complicates the code and is pure overhead. So, my question is in respect to my future career and my answer to manager types throwing random pattern-names around: Which design patterns did you use, that threw you back overall? Which are the worst design patterns, that you shouldn't have a look at if it's not that only single situation where it makes sense (read: which design patterns are very narrowly defined)? (It's like I was looking for the negative reviews of an overall good product of amazon to see what bugged people most in using design patterns). And I'm not talking about Anti-Patterns here, but about Patterns that are usually thought of as "good" patterns.

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  • Design patterns: when to use and when to stop doing everything using patterns

    - by honeybadger
    This question arises due to comment of FredOverflow in my previous post. Design pattern used in projects I am quite confused by the comment. I know design pattern help in making code reusable and readable (may lack in efficiency a bit). But when to use design patterns and most importantly when to stop doing everything using patterns or carried away by it ? Any comments from you will be helpful. tagging programing languages too to cover broader audience.

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  • User Experience Guidance for Developers: Anti-Patterns

    - by ultan o'broin
    Picked this up from a recent Dublin Google Technology User Group meeting: Android App Mistakes: Avoiding the Anti-Patterns by Mark Murphy, CommonsWare Interesting approach of "anti-patterns" aimed at mobile developers (in this case Android), looking at the best way to use code and what's in the SDK while combining it with UX guidance (the premise being the developer does the lot). Interestingly, the idea came through that developers need to stop trying to make one O/S behave like another--on UX grounds. Also, pretty clear that a web-based paradigm is being promoting for Android (translators tell me that translating an Android app reminded them of translating web pages too). Haven't see the "anti"-approach before, developer cookbooks and design patterns sure. Check out the slideshare presentation.

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  • Official List of ‘Windows 8 Release Preview Ready’ Anti-Virus/Malware Software Now Available

    - by Asian Angel
    With the recent availability of the Windows 8 Release Preview you may be wondering just which anti-virus/malware apps have been cleared/approved by Microsoft to work with it. Well, your wait is now over. Microsoft has posted an official list along with the download links for the anti-virus/malware apps that are Windows 8 Release Preview ready. Antimalware apps for Windows 8 Release Preview [via The Windows Club] How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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  • Is ORM an Anti-Pattern?

    - by derphil
    I had a very stimulating and interessting discussion with a colleague about ORM and it's Pros and Cons. In my opinion, an ORM is useful only in the rarest cases. At least in my experience. But I don't want to list my own arguments at this time. So I ask you, what do you think about ORM? What are the Pros and the Cons? P.S. I've posted this "question" yesterday on Stackoverflow, but some of the user think, that this should better posted here.

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  • Patterns to refactor common code in multi-platform software

    - by L. De Leo
    I have a Django application and a PyQt application that share a lot of code. A big chunk of the PyQt application are copied verbatim from the Django application's views. As this is a game, I have already an engine.py module that I'm sharing among the two applications, but I was wondering how to restructure the middle layer (what in Django corresponds to the largest part of the views minus the return HttpResponse part) into its own component. In the web application the components are those of a classic Django application (with the only exception that I don't make any use of models): the game engine the url dispatcher the template the views My PyQt application is divided into: the game engine the UI definition where I declare the UI components and react to the events (basically this takes the place of the template and the url dispatcher in the Django app) the controller where I instantiate the window object and reproduce the methods that map the views in the Django app

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  • Microkernel architectural pattern and applicability for business applications

    - by Pangea
    We are in the business of building customizable web applications. We have the core team that provides what we call as the core platform (provides services like security, billing etc.) on top of which core products are built. These core products are industry specific solutions like telecom, utility etc. These core products are later used by other teams to build customer specific solutions in a particular industry. Until now we have a loose separation between platform and core product. The customer specific solutions are build by customizing 20-40% of the core offering and re-packaging. The core-platform and core products are released together as monolithic apps (ear). I am looking to improvise the current situation so that there is a cleaner separation on these 3. This allows us to have evolve each of these 3 separately etc. I've read through the Mircokernel architecture and kind of felt that I can take apply the principles in my context. But most of my reading about this pattern is always in the context of operating systems or application servers etc. I am wondering if there are any examples on how that pattern was used for architecting business applications. Or you could provide some insight on how to apply that pattern to my problem.

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  • Design patterns and multiple programming language

    - by Eduard Florinescu
    I am referring here to the design patterns found in the GOF book. First how I see it, there are a few peculiarities to design pattern and knowing multiple language knowledge, for example in Java you really need a singleton but in Python you can do without it you write a module, I saw somewhere a wiki trying to write all GOF patterns for JavaScript and the entries where empty, I guess because it might be a daunting task. If there is someone who is using design patterns and is programming in multiple programming languages supporting the OOP paradigm and can give me a hint on how should I approach design patterns that might help me in all languages I use(Java, JavaScript, Python, Ruby): Can I write good application without knowing exactly the GOF design patterns or I might need some of them which might be crucial and if yes which one, are they alternatives to GOF for specific languages, and should a programmer or a team make its own design patterns set?

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  • Design patterns and multiple programming languages

    - by Eduard Florinescu
    I am referring here to the design patterns found in the GOF book. First, how I see it, there are a few peculiarities to design pattern and knowing multiple languages, for example in Java you really need a singleton but in Python you can do without it you write a module, I saw somewhere a wiki trying to write all GOF patterns for JavaScript and all the entries were empty, I guess because it might be a daunting task to do that adaptation. If there is someone who is using design patterns and is programming multiple languages supporting the OOP paradigm and can give me a hint on how should I approach design patterns. An approach that might help me in all languages I use(Java, JavaScript, Python, Ruby): Can I write good application without knowing exactly the GOF design patterns or I might need just some of them which might be crucial and if yes which one, are there alternatives to GOF for specific languages, and should a programmer or a team make their own design patterns set?

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  • So, "Are Design Patterns Missing Language Features"?

    - by Eduard Florinescu
    I saw the answer to this question: How does thinking on design patterns and OOP practices change in dynamic and weakly-typed languages? There it is a link to an article with an outspoken title: Are Design Patterns Missing Language Features. But where you can get snippets that seem very objective and factual and that can be verified from experience like: PaulGraham said "Peter Norvig found that 16 of the 23 patterns in Design Patterns were 'invisible or simpler' in Lisp." and a thing that confirms what I recently seen with people trying to simulate classes in javascript: Of course, nobody ever speaks of the "function" pattern, or the "class" pattern, or numerous other things that we take for granted because most languages provide them as built-in features. OTOH, programmers in a purely PrototypeOrientedLanguage? might well find it convenient to simulate classes with prototypes... I am taking into consideration also that design patterns are a communcation tool and because even with my limited experience participating in building applications I can see as an anti-pattern(ineffective and/or counterproductive) for example forcing a small PHP team to learn GoF patterns for small to medium intranet app, I am aware that scale, scope and purpose can determine what is effective and/or productive. I saw small commercial applications that mixed functional with OOP and still be maintainable, and I don't know if many would need for example in python to write a singleton but for me a simple module does the thing. patterns So are there studies or hands on experience shared that takes into consideration, all this, scale and scope of project, dynamics and size of the team, languages and technologies, so that you don't feel that a (difficult for some)design pattern is there just because there isn't a simpler way to do it or that it cannot be done by a language feature?

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  • What are some great resources about programming contemporary GUIs and GUI architecture patterns?

    - by snitko
    So I've read Martin Fowler's old blog post http://martinfowler.com/eaaDev/uiArchs.html which describes various approaches to building GUI from an architecture point of view, discussing patterns and how they were used. But this blog post was written in 2006. Since then, there must have been some new ideas in the field? I was curious whether anyone knows about a similar guide to GUI architectures, but describing contemporary systems? The reason I'm interested in something abstract and theoretical to read is because it really is difficult and time consuming to ACTUALLY learn how ALL of the contemporary frameworks work, given their diversity and the diversity of the languages they are written in. I am primarily a web developer, so I'm familiar with Rails and some Javascript frameworks. But I would also like to know how GUI is built on Android or in Cocoa or in Windows, but without having to learn all of those things.

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  • AntFarm anti-pattern -- strategies to avoid, antidotes to help heal from

    - by alchemical
    I'm working on a 10 page web site with a database back-end. There are 500+ objects in use, trying to implement the MVP pattern in ASP.Net. I'm tracing the code-execution from a single-page, my finger has been on F-11 in Visual Studio for about 40 minutes, there seems to be no end, possibly 1000+ method calls for one web page! If it was just 50 objects that would be one thing, however, code execution snakes through all these objects just like millions of ants frantically woring in their giant dirt mound house, riddled with object tunnels. Hence, a new anti-pattern is born : AntFarm. AntFarm is also known as "OO-Madnes", "OO-Fever", OO-ADD, or simply design-pattern junkie. This is not the first time I've seen this, nor my associates at other companies. It seems that this style is being actively propogated, or in any case is a misunderstanding of the numerous OO/DP gospels going around... I'd like to introduce an anti-pattern to the anti-pattern: GST or "Get Stuff Done" AKA "Get Sh** done" AKA GRD (GetRDone). This pattern focused on just what it says, getting stuff done, in a simple way. I may try to outline it more in a later post, or please share your ideas on this antidote pattern. Anyway, I'm in the midst of a great example of AntFarm anti-pattern as I write (as a bonus, there is no documentation or comments). Please share you thoughts on how this anti-pattern has become so prevelant, how we can avoid it, and how can one undo or deal with this pattern in a live system one must work with!

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  • Design Anti-Patterns - C# - Do you call this a God object?

    - by Reddy S R
    I am writing Portfolio module for my web site and it has 3 components. Gallery Category, Gallery, & Gallery Images. I am doing all the request handling, (creating, reading, updating, other), for the above 3 components in 1 class, Portfolio. DB handling jobs for Portfolio module is done in another file. My question is, even just for request handling purpose, can you do all the operations in 1 class? -Reddy

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  • The worst anti-patterns you have came across.

    - by ?????????
    What are the worst anti-patterns you have came across in your career as a programmer? I'm mostly involved in java, although it is probably language-independent. I think the worst of it is what I call the main anti-pattern. It means program consisting of single, extremely big class (sometimes accompanied with a pair of little classes) which contains all logic. Typically with a big loop in which all business logic is contained, sometimes having tens of thousands of lines of code.

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  • Is implementing an interface defined in a subpackage an anti-pattern?

    - by Michael Kjörling
    Let's say I have the following: package me.my.pkg; public interface Something { /* ... couple of methods go here ... */ } and: package me.my; import me.my.pkg.Something; public class SomeClass implements Something { /* ... implementation of Something goes here ... */ /* ... some more method implementations go here too ... */ } That is, the class implementing an interface lives closer to the package hierarchy root than does the interface it implements but they both belong in the same package hierarchy. The reason for this in the particular case I have in mind is that there is a previously-existing package that groups functionality which the Something interface logically belongs to, and the logical (as in both "the one you'd expect" and "the one where it needs to go given the current architecture") implementation class exists previously and lives one level "up" from the logical placement of the interface. The implementing class does not logically belong anywhere under me.my.pkg. In my particular case, the class in question implements several interfaces, but that feels like it doesn't make any (or at least no significant) difference here. I can't decide if this is an acceptable pattern or not. Is it or is it not, and why?

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  • Suggestions: Anti-Pattern counter-examples

    - by Tom W
    It doesn't seem that this exact question has been asked before, so I'll fire away: Most of us are familiar with the concept of an anti-pattern. However, avoiding implementation of anti-patterns can in principle swing too far the other way and cause problems itself. As an example, "Design by Committee" has a counter-example that I'd call "Design by Maverick" - wherein the design of an important feature is handed off to an individual to do what they think best, with the intention of reviewing their work later and deciding whether it should be finalised or go through another iteration. This takes much longer in practice as the rest of the team are occupied by other things, and can end up with a feature that's useful to nobody, particularly if the Maverick is not themselves an experienced end-user. Does anyone have any more examples of anti-pattern counter-examples?

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  • Design Patterns: Should I learn them?

    - by prelic
    So it's kinda weird asking two questions back-to-back, but they aren't very related and I didn't want to combine them, but I'm not spamming questions, I promise! Anyway, I'm a recent college grad, and my education only touched on design patterns...we implemented a few simple ones, touched on the fact that there were more complicated ones, and were instructed to turn to the GoF book if we wanted to learn more. My question is, is it worth learning the patterns in the GoF book? To me, it's always seemed counter-intuitive to try and make a problem fit a classic pattern, but obviously the book, and the patterns, are famous for a reason. Do they show up enough that I should be learning them? Thanks again!

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  • Design Patterns and their most common uses for them [closed]

    - by cable729
    Possible Duplicate: What are some programming design patterns that are useful in game development? As I'm returning to game dev, I've realized that I've lost a lot of the knowledge I had before. So now I'm looking at design patterns that I can use for my next project. One design pattern that I've seen a lot is the 'composition method,' which uses actors and components. Is that the right name for it? I'd like to look more at this and see what the advantages/pitfalls are. So what design patterns are out there, and what are the advantages/disadvantages to them?

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  • Design Patterns for these scenarios

    - by user1899749
    Please help me to find design patterns for following situations. Situation 1: how can a smart robot use Wi-Fi? Situation 2: How can a Smart robot automatically go to rechargeable unit while there is no remote signal? Situation 3: Voice recognition component (If homeowner itself at home and motion detection is off then how can Smart Robot voice recognition component will recognize those very sensitive sentences) Situation 4: Motion detection component (How can Smart Robot send video stream on cell phone while homeowner/resident driving) I am looking for the design patterns for above Situations to answer following question. if not using design patterns, then what’re the difficulties?

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  • The importance of Design Patterns with Javascript, NodeJs et al

    - by Lewis
    With Javascript appearing to be the ubiquitous programming language of the web over the next few years, new frameworks popping up every five minutes and event driven programming taking a lead both server and client side: Do you as a Javascript developer consider the traditional Design Patterns as important or less important than they have been with other languages / environments?. Please name the top three design patterns you, as a Javascript developer use regularly and give an example of how they have helped in your Javascript development.

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  • Teacher demands excessive/unjustified use of Design Patterns

    - by SoboLAN
    I study computer science and I have a class called "Programming Techniques". Its purpose is to teach (us) good object oriented design principles. During the semester we have homeworks, programs that we must write to demonstrate what we've learned. The lab assistant demands for each of these homeworks that specific design patterns should be used. For example, the current homework is an application used for processing customer orders. We are demanded to use either "Factory Method" or "Abstract Factory" design patterns for this. It gets even worse: at the end of the semester we must write a program (something more complex) that must use at least one creational pattern, at least one structural pattern and at least one behavioural pattern. Is it normal to demand this ? I mean, forcing us to design our programs in such a way that a specific design pattern makes sense is just beyond what I consider ok. If I'm a car mechanic and have a huge tool box, then I will use a certain tool from that box if and when the situation demands it. Not more, not less. If my design of the application doesn't demand at all the use of "Abstract Factory" (for example), then why should I implement it ? I'm not sure yet if the senior lecturer agrees with what the lab assistant is demanding, but I want to talk to him about it and I need solid arguments to do so. How should I approach this problem with him ? PS: I'm sure there must be a better way to teach us these things. Maybe making us each week read about 3 design patterns and the next week giving us a test with small but specific programming or architectural situations/problems. The goal in that test would be to identify what design patterns would make sense and how they could be implemented. This way, he can see if we understand them. EDIT: These homeworks are not just 100-line programs, they have quite a lot of requirements and are fairly complicated. This is the reason we have about 2 - 3 weeks of deadline for each of them. I agree that practicing this is the best way to learn. But shouldn't smaller programs/applications be used for this ? Something just for demonstrating purposes. Not big programs with lots of requirements/classes/etc.

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  • Design patterns to avoiding breaking the SRP while performing heavy data logging

    - by Kazark
    A class that performs both computations and data logging seems to have at least two responsibilities. Given a system for which the specifications require heavy data logging, what kind of design patterns or architectural patterns can be used to avoid bloating all the classes with logging calls every time they compute something? The decorator pattern be used (e.g. Interpolator decorated to LoggingInterpolator), but it seems that would result in a situation hardly more desirable in which almost every major class would need to be decorated with logging.

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  • Are there any GUI or user interface design patterns? [closed]

    - by Niranjan Kala
    I was curious about GUI design patterns, so I searched and got some information, including a list of UI patterns for the web. This UI patterns website says that: UI Patterns is a growing collection of User Interface Design Principles and User Interface Usability Patterns present on web applications and sites today. Are there any other design patterns for constructing websites or other user interfaces? Are there any books that describe these patterns? I'm particularly interested in patterns for Windows desktop development and web development in the .NET platform.

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  • Patterns & Practices: Composite Services CTP2 is Public

    - by HernanDL
    Finally the last CTP and pre-release version for the Composite Services is out. There were quite a lot of changes since CTP1. We added many new samples and many enhancements to the repository (DB) which is now called Inventory in sync with SOA Patterns. Here is a brief list of the main changes according to the included documentations.   Changes and additions in this release This CTP release contains reusable source code and samples to illustrate implementation for the following patterns and scenarios: Repair and Resubmit – this pattern is implemented in ESB Toolkit 2.0 as part of Exception Management Framework (EMF). This code drop provides code sample how to implement this pattern for Windows AppFabric workflow service, using Exceptions Web Service and workflow activities to create fault message, which will be created in EMF database.  Analytic Tracing – this code drop contains reusable code and samples for implementing ETW tracing: event collector service and database that store collected events. This capability may be used for scenarios that need flexibility on how collected events are decoded and processed via extensibility points you can configure and implement:  plugins and event decoders with leveraging ETW tracing capabilities provided by the event collector service.   Inventory Centralization – this code drop contains service catalog database, web services and samples to show how to implement Metadata Centralization, Schema Centralization and Policy Centralization patterns.  Service Virtualization – we included sample for implementing this pattern using WCF routing service( which is part of .NET framework) and service metadata centralization capabilities to define routing service metadata in service catalog. Termination Notification – we included sample for implementing this pattern using sample WCF service and policy centralization capabilities provided by this CTP release.   You will also find many new videos that will be uploaded to the home page any time soon. Stay tunned for new posts regarding implemetation details and advanced customizations for custom policy exporters/importers and monitoring.

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