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  • Efficient database access when dealing with multiple abstracted repositories

    - by Nathan Ridley
    I want to know how most people are dealing with the repository pattern when it involves hitting the same database multiple times (sometimes transactionally) and trying to do so efficiently while maintaining database agnosticism and using multiple repositories together. Let's say we have repositories for three different entities; Widget, Thing and Whatsit. Each repository is abstracted via a base interface as per normal decoupling design processes. The base interfaces would then be IWidgetRepository, IThingRepository and IWhatsitRepository. Now we have our business layer or equivalent (whatever you want to call it). In this layer we have classes that access the various repositories. Often the methods in these classes need to do batch/combined operations where multiple repositories are involved. Sometimes one method may make use of another method internally, while that method can still be called independently. What about, in this scenario, when the operation needs to be transactional? Example: class Bob { private IWidgetRepository _widgetRepo; private IThingRepository _thingRepo; private IWhatsitRepository _whatsitRepo; public Bob(IWidgetRepository widgetRepo, IThingRepository thingRepo, IWhatsitRepository whatsitRepo) { _widgetRepo = widgetRepo; _thingRepo= thingRepo; _whatsitRepo= whatsitRepo; } public void DoStuff() { _widgetRepo.StoreSomeStuff(); _thingRepo.ReadSomeStuff(); _whatsitRepo.SaveSomething(); } public void DoOtherThing() { _widgetRepo.UpdateSomething(); DoStuff(); } } How do I keep my access to that database efficient and not have a constant stream of open-close-open-close on connections and inadvertent invocation of MSDTS and whatnot? If my database is something like SQLite, standard mechanisms like creating nested transactions are going to inherently fail, yet the business layer should not have to be concerning itself with such things. How do you handle such issues? Does ADO.Net provide simple mechanisms to handle this or do most people end up wrapping their own custom bits of code around ADO.Net to solve these types of problems?

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  • Caching proxy for yum and debian repositories

    - by Sushant Jain
    Does a caching proxy for yum exist, similar to approx for Debian repositories? Is there a way to have reprepro behave the same as approx? I have heard that approx was not as stable; besides, I would prefer the use of reprepro so that I could use my existing web server to serve the repository.

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  • Mercurial repositories hosting with different user access levels

    - by kender
    I want to set a few Mercurial 'central' repositories on one machine. There are few things I need to have working though: Each repository should have its own ACL, with different users allowed to push/pull It shouldn't be ssh-based (it shouldn't require users to have shell accounts on that machine) So, I guess that leaves me with some https with basic authentication, right? Are there any working solutions that provide this kind of functions?

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  • Domain Driven Design And The Entity Framework

    - by Hossein
    hi, I'm new to DDD and i want to use entity framework v4.0 (shipped with .net 4.0) in my new project. since i have few time to learn DDD and entity framework, which books are good for me to read first?! i'm going to first read Domain-Driven Design Tackling Complexity in the Heart of Software by Eric Evan and next Pro Entity Framework 4.0 (Apress Scott Klein)... the problem here is Eric Evan's book is too abstract,I want to know if the Pro Entity framework 4.0 is complete enough i just skip the first book! in the end recommend me some good books in DDD and Entity Framework Thanks

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  • OOP App Architecture: Which layer does a lazy loader sit in?

    - by JW
    I am planning the implemention an Inheritance Mapper pattern for an application component http://martinfowler.com/eaaCatalog/inheritanceMappers.html One feature it needs to have is for a domain object to reference a large list of aggreageted items (10,000 other domain objects) So I need some kind of lazy loading collection to be passed out of the aggregate root domain object to other domain objects. To keep my (php) model scripts organised i am storing them in two folders: MyComponent\ controllers\ models\ domain\ <- domain objects, DDD repository, DDD factory daccess\ <- PoEAA data mappers, SQL queries etc views\ But now I am racking my brains wondering where my lazy loading collection sits. Any suggestions / justifications for putting it in one place over another another? DDD = Domain Driven Design Patterns, Eric Evans - book PoEAA = Patterns of Application Architecture Patterns, Martin Fowler - book

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  • Advantages of GitHub over Bitbucket for Git Repositories [closed]

    - by rolve
    Now that Bitbucket also supports Git repositories, it seams to me that it is a good alternative to GitHub, especially since its free plan includes unlimited private repositories, which is not available on GitHub. Yet, GitHub seams much more popular. Are there any major reasons to choose GitHub as the hosting site for Git repositories instead of Bitbucket? (Although I have no problems with making my personal projects publicly available in general, I like the idea of being able to make the switch from public to private or vice versa any time I want. But if there are some good reasons to use GitHub, I would be willing to give up this freedom.)

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  • Value objects in DDD - Why immutable?

    - by Hobbes
    I don't get why value objects in DDD should be immutable, nor do I see how this is easily done. (I'm focusing on C# and Entity Framework, if that matters.) For example, let's consider the classic Address value object. If you needed to change "123 Main St" to "123 Main Street", why should I need to construct a whole new object instead of saying myCustomer.Address.AddressLine1 = "123 Main Street"? (Even if Entity Framework supported structs, this would still be a problem, wouldn't it?) I understand (I think) the idea that value objects don't have an identity and are part of a domain object, but can someone explain why immutability is a Good Thing? EDIT: My final question here really should be "Can someone explain why immutability is a Good Thing as applied to Value Objects?" Sorry for the confusion! EDIT: To clairfy, I am not asking about CLR value types (vs reference types). I'm asking about the higher level DDD concept of Value Objects. For example, here is a hack-ish way to implement immutable value types for Entity Framework: http://rogeralsing.com/2009/05/21/entity-framework-4-immutable-value-objects. Basically, he just makes all setters private. Why go through the trouble of doing this?

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  • Can't install libopenssl-ruby

    - by Oetzi
    I'm trying to install ruby on rails and I can't seem to install libopenssl-ruby. I'm on a VPS and I've installed Jaunty as the newer releases don't seem to work very nicely. When I do: apt-get install libopenssl-ruby I get: E: Package libopenssl-ruby has no installation candidate Originally it simply said that it couldn't find the package but after wget'ing a deb form here: http://linuxappfinder.com/package/libopenssl-ruby and trying to install using dpkg I get this new error. Dpkg itself said that it couldn't install my deb as it depended on 'libopenssl-ruby'. Currently my sources.lst is this: ###### Ubuntu Main Repos deb http://us.archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse Does anyone know what might be wrong?

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  • Multi Svn Repositories in Apache

    - by fampinheiro
    I have a set up with apache and subversion In the apache configuration i have <Location /svn> DAV svn SVNParentPath c:/svn </Location> Now i have multiple repositories a a_b a_c a_b_c a_b_d b and i want to map them as a/svn a/b/svn a/c/svn a/b/c/svn a/b/d/svn b/svn to do this without adding directives and restarting apache i tought of making this rules RewriteEngine On RewriteCond $1 !=svn RewriteCond $2 !=svn RewriteRule ^/([^/]+)/(.*?)/svn/(.*)$ /$1_$2/svn/$3 [N] RewriteRule ^/([^/]+)/svn/(.*)$ /svn/$1/$2 [L,PT] this way i rewrite them to /svn/a /svn/a_b /svn/a_c /svn/a_b_c /svn/a_b_d /svn/b The objective is that the client don't have the notion of this happening when a acess is made to a folder without trailing slash the mod dav return a redirect to the folder with the trailing slash exposing my internal url. can i rewrite the outgoing url ?!

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  • I've filed an ITP bug on bugs.debian.org - now how do I get the package into Ubuntu?

    - by George Edison
    I've written a development library that I would like to include in the Ubuntu archives. From what I understand, the best way to do this is to first get the package into Debian and then request a package sync. Here is the ITP bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=691467 Now my question is simply... what do I do now? Looking at this page, I see horrifying things like "419 days in preparation" and "last activity 404 days ago". I get the impression that getting a package into Debian is a slow process. Is there anything I can do to speed up the process? I've tried to do as much work as I can to smooth out the process - I've got a branch with Debian packaging (which gets by Lintian without any errors).

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  • How to install google chrome from the official repos?

    - by Suhaib
    I followed this question : How to install Chrome browser properly via command line? However, It is not the same as the one mentioned in google's website : http://www.google.com/linuxrepositories/ I want to do this one instead. The process is: On an APT-based system (Debian, Ubuntu, etc.), download the key and then use apt to install it. wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - sudo apt-get update what would be the next step ? I tried sudo apt-get intsall google-chrome and I ended up with this error Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package google-chrome

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  • Search multiple SVN repositories for some search terms/regex

    - by MicSim
    I've got multiple SVN repositories of different projects on the server which I would like to search for the same search term / regex, but without checking out or updating each project and doing the search manually on each of them. I'd like to know if it is possible to search multiple SVN repositories for some search terms (or regex).

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  • Games installed from repos won't start

    - by Shauna
    I'm running Natty (upgraded from Maverick) with Gnome 3 (from the Gnome 3 PPA, Unity removed), and have recently found that some of my games from the repos no longer work. When I go to start them, I get the message Failed to launch [app name]. Failed to execute child process [app name] (no such file or directory). I've so far found this on Gweled and PyScrabble. Other games (Mines, Sudoku, Mahjongg), as well as other applications have opened just fine. Gweled used to open fine until recently. Any ideas on how to fix this?

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  • Merging Two Git Repositories with branches

    - by Joel K
    I realize there's a Stack Overflow question: http://stackoverflow.com/questions/277029/combining-multiple-git-repositories But I haven't found git-stitch-repo to be quite the tool I'm looking for. I also consider this more of a sysadmin task. How do I take code from an external repository and combine it with code from a primary repository while maintaining history/diffs and branches. Use case: An outside development team using SVN has ported to git and now wants to 'merge' their code in to the main company's git repo. I've tried subtree merges, but I lose the history. I've tried git-stitch-repo, but that process results in an entirely new repo that's missing branches. I just want to slot in some outside code as a sub-directory in our current main repo with as little disruption as possible and while maintaining the other project's history. Any success stories out there?

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  • What are "Location" and "Repositories" in the VisualSVN?

    - by Roman
    I am trying to install VisualSVN to manage my code with other users. In the middle of the installation I have a window saying "Change if necessary installation path and initial VisualSVN Server setting". And after that (in the same window) I have two fields: "Location" and "Repositories". What these two parameters mean? I know URL where the common code is stored. Should I specify this URL in the "repositories" field?

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  • Install package from debian stable unavailable in testing/unstable repositories

    - by overprescribed
    I'm currently running Debian testing and would like to install a package only available in the stable repositories. (I'm surprised I haven't come across this issue before) I could download the .deb directly and use dpkg to manually install it, but installing packages from one release into another is usually frowned upon. What's the best course of action? EDIT: Zoredache is right, I didn't realize this package has been removed from future versions of Debian as it no longer has a maintainer. It is of course, also pointed out by Zoredache, important to find out why a particular package has been removed before attempting to install it. I've altered the title slightly to reflect the actual issue.

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  • Setting up 2 or more Repositories?

    - by user364133
    My question is: can i have 2 repositories without losing my original repository. Lets say i want the the eclair source repository repo init -u git://android.git.kernel.org/platform/manifest.git -b eclair (already synced and working) and i would also like to sync with cyanogens repository repo init -u git://github.com/cyanogen/android.git -b eclair All i basically want to do is have both repositories without altering or messing up the original. thanks.

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  • Good Domain Driven Design samples

    - by jlembke
    I'm learning about DDD and enjoying every minute of it. However, there are some practical issues that are confusing to me that I think seeing some good samples might clear up. So being at peace with those issues, does anyone know of some good working code samples that do a good job of modeling basic DDD concepts? Particularly interested in An illustrative Domain Model Repositories Use of Domain/Application Services Value Objects Aggregate Roots I know I'm probably asking for too much, but anything close will help.

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  • shell command to find a process id and attach to it?

    - by lallous
    Hello I want to attach to a running process using 'ddd', what I manually do is: # ps -ax | grep PROCESS_NAME Then I get a list and the pid, then I type: # ddd PROCESS_NAME THE_PID Is there is a way to type just one command directly? Remark: When I type ps -ax | grep PROCESS_NAME <- grep will match both the process and grep command line itself.

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  • Any Alternatives to NCommon?

    - by Innogetics
    I like the way NCommon saves me from dealing with all the plumbing required to do DDD with NHibernate. I like it so much that it I am seriously considering it to be part of my default architecture in new projects. I'd like to ask if there are other DDD alternatives (aside from coding from scratch) to what NCommon does. Thanks.

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  • How would you organize this in asp.net mvc?

    - by chobo
    I have an asp.net mvc 2.0 application that contains Areas/Modules like calendar, admin, etc... There may be cases where more than one area needs to access the same Repo, so I am not sure where to put the Data Access Layers and Repositories. First Option: Should I create Data Access Layer files (Linq to SQL in my case) with their accompanying Repositories for each area, so each area only contains the Tables, and Repositories needed by those areas. The benefit is that everything needed to run that module is one place, so it is more encapsulated (in my mind anyway). The downside is that I may have duplicate queries, because other modules may use the same query. Second Option Or, would it be better to place the DAL and Repositories outside the Area's and treat them as Global? The advantage is I won't have any duplicate queries, but I may be loading a lot of unnecessary queries and DAL tables up for certain modules. It is also more work to reuse or modify these modules for future projects (though the chance of reusing them is slim to none :)) Which option makes more sense? If someone has a better way I'd love to hear it. Thanks!

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