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longchamppas

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longchamppas

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vikramsjn

Programming Proverbs - Computer Science Teacher - Thoughts and Information from Alfred ... - 0 views

  • Interesting comment about IntelliSense encouraging a bottom-up approach. I think that is true if you start with programming and not with design. What I mean by that is that some people create their design in code rather than working out the full design before starting to code. I think that if you create a design using a top down approach it takes longer to get to the building blocks. that is frustrating to many, especially students, but in the long run results in a much better design. With a complete design in place one does know what the little blocks of code will be at least from the standpoint of names and interfaces. Creating those little blocks early on in the programming is fine as long as the design is complete
  •  
    very good and useful list of properly arranged proverbs
Joel Bennett

Using RabbitMQ with C# and .NET - 3 views

  • I'm currently working on a project where I need to be able to transfer a large number of requests via JSON over web services. I need to take some of that data, do some aggregation with it, and store it in a persistent store. In order to allow the data to be reliably processed in a number of different ways, I wanted to place the incoming data into multiple queues and have it processed and then stored.
  • RabbitMQ fits the bill on all of these fronts, is crazy easy to setup and use, and is very fast.
  • RabbitMQ is written in Erlang
  •  
    RabbitMQ is a cross-platform implementation of an Advanced Message Qeuing Protocol (AMQP) broker (similar to MSMQ). There's a .Net client, and it allows you to decouple your routing and an message storage, and do so in a cross-platform way.
Joel Bennett

Xceed DataGrid for .WPF Windows Presentation Foundation data grid gridview presenter co... - 0 views

  • Price: FREE (Licensing FAQ)
  •  
    A very impressive datagrid and date-picker for WPF available for free (in exchange for your name & email). Has a *really* slick "Card" view, as well as fully hierarchical standard grids and more. With all the usual in-place cell editors, XCEED's WPF DataGrid is fully styleable and templateable.

    AND IT'S FREE!

Joel Bennett

Tracing in .NET and Implementing Your Own Trace Listeners - 0 views

  • TextWriterTraceListener
  •  
    A good place to start if you want to do trace or debug messages from .NET, this article explains the differences between trace and debug, how you can turn them on and off, and how you can set them to trace to file or event log without recompiling. Excellent.
Joel Bennett

WhoisThisDomain - Retrieve WHOIS record of domain - 0 views

  •  
    WhoIs lookup app which will automatically find the right place to lookup a domain's owner.
Joel Bennett

coComment - Join the conversation - 0 views

  • coComment keeps track of all the online conversations you're following in one convenient place, and informs you whenever something is added to a conversation.
  •  
    A firefox sidebar that lets you follow comment threads on forums or blogs wherever you find them...
Matteo Spreafico

Fabulous Adventures In Coding : The Stack Is An Implementation Detail, Part One - 0 views

  • Almost every article I see that describes the difference between value types and reference types explains in (frequently incorrect) detail about what “the stack” is and how the major difference between value types and reference types is that value types go on the stack.
  • I find this characterization of a value type based on its implementation details rather than its observable characteristics to be both confusing and unfortunate. Surely the most relevant fact about value types is not the implementation detail of how they are allocated, but rather the by-design semantic meaning of “value type”, namely that they are always copied “by value”.
  • Of course, the simplistic statement I described is not even true. As the MSDN documentation correctly notes, value types are allocated on the stack sometimes. For example, the memory for an integer field in a class type is part of the class instance’s memory, which is allocated on the heap.
  • ...3 more annotations...
  • As long as the implementation maintains the semantics guaranteed by the specification, it can choose any strategy it likes for generating efficient code
  • That Windows typically does so, and that this one-meg array is an efficient place to store small amounts of short-lived data is great, but it’s not a requirement that an operating system provide such a structure, or that the jitter use it. The jitter could choose to put every local “on the heap” and live with the performance cost of doing so, as long as the value type semantics were maintained
  • I would only be making that choice if profiling data showed that there was a large, real-world-customer-impacting performance problem directly mitigated by using value types. Absent such data, I’d always make the choice of value type vs reference type based on whether the type is semantically representing a value or semantically a reference to something.
Matteo Spreafico

Joe Duffy's Weblog - OnBeingStateful - 0 views

  • The biggest question left unanswered in my mind is the role state will play in software of the future.
  • The biggest question left unanswered in my mind is the role state will play in software of the future. That seems like an absurd statement, or a naïve one at the very least.  State is everywhere: The values held in memory. Data locally on disk. Data in-flight that is being sent over a network. Data stored in the cloud, including on a database, remote filesystem, etc. Certainly all of these kinds of state will continue to exist far into the future.  Data is king, and is one major factor that will drive the shift to parallel computing.  The question then is how will concurrent programs interact with this state, read and mutate it, and what isolation and synchronization mechanisms are necessary to do so?
  • Many programs have ample gratuitous dependencies, simply because of the habits we’ve grown accustomed to over 30 odd years of imperative programming.  Our education, mental models, books, best-of-breed algorithms, libraries, and languages all push us in this direction.  We like to scribble intermediary state into shared variables because it’s simple to do so and because it maps to our von Neumann model of how the computer works.
  • ...3 more annotations...
  • We need to get rid of these gratuitous dependencies.  Merely papering over them with a transaction—making them “safe”—doesn’t do anything to improve the natural parallelism that a program contains.  It just ensures it doesn’t crash.  Sure, that’s plenty important, but providing programming models and patterns to eliminate the gratuitous dependencies also achieves the goal of not crashing but with the added benefit of actually improving scalability too.  Transactions have worked so well in enabling automatic parallelism in databases because the basic model itself (without transactions) already implies natural isolation among queries.  Transactions break down and scalability suffers for programs that aren’t architected in this way.  We should learn from the experience of the database community in this regard
  • There will always be hidden mutation of shared state inside lower level system components.  These are often called “benevolent side-effects,” thanks to Hoare, and apply to things like lazy initialization and memorization caches.  These will be done by concurrency ninjas who understand locks.  And their effects will be isolated by convention.
  • Even with all of this support, we’d be left with an ecosystem of libraries like the .NET Framework itself which have been built atop a fundamentally mutable and imperative system.  The path forward here is less clear to me, although having the ability to retain a mutable model within pockets of guaranteed isolation certainly makes me think the libraries are salvageable.  Thankfully, the shift will likely be very gradual, and the pieces that pose substantial problems can be rewritten in place incrementally over time.  But we need the fundamental language and type system support first.
David Corking

iSqueak Wikki: Home of the iPhone/Touch port of Squeak - 0 views

  • iSqueak: Squeak for (i)Touch Devices (Squeak) wins 3rd Place in the ESUG Innovation Awards Here's a video of iSqueak in action∞ Here's a audio track discussing the iSqueak development∞
  •  
    This is a living breathing ARM port contributed by John McIntosh in 2008 and forward. I wonder if there are any Squeak apps in the iTunes App Store yet.
Nicole Smith

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