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Thursday, May 29, 2008 5:00 AM

Building with Encoders

The basis of a channel stack is that there is a series of objects that share a common interface for communication. This leaves message encoders with something of a problem as the primitive operations for encoding and decoding messages are different than
Posted by Nicholas Allen | 2 Comments
Friday, October 19, 2007 5:00 AM

Best Practice for Channel Shapes

The hierarchy of channels derives from the single interface IChannel. By itself, IChannel is not particularly interesting because it doesn't introduce any new methods for communication. Each channel shape, such as IInputChannel or IDuplexSessionChannel,
Posted by Nicholas Allen | 1 Comments
Tuesday, October 16, 2007 5:00 AM

Shutting Down a Channel

A common corner-case in programming is what happens when multiple operations are attempted at the same time. One way to avoid the troubles of this corner-case is to simply prohibit having multiple operations occur simultaneously. However, it typically
Posted by Nicholas Allen | 4 Comments
Tuesday, October 02, 2007 5:00 AM

Always Begin with Accept

Inside a service, there's a fundamental loop running whose job it is to create channels for the incoming connections to the service. There's another loop that runs later, which you may argue is equally fundamental, that reads messages from each channel
Posted by Nicholas Allen | 1 Comments
Tuesday, June 05, 2007 8:00 AM

Live from TechEd Day 2

I gave a chalk talk on channel development in the afternoon yesterday. I did a huge experiment for the second-half of the talk, which was to write a custom channel from scratch for the audience. That's the kind of theater that you can pull off in a chalk
Posted by Nicholas Allen | 1 Comments
Thursday, April 26, 2007 5:00 AM

Custom Channel Development

I'll be giving another talk on channel development for WCF this year at TechEd. Due to the selection of sessions, there's really only one good lead-in talk and it's currently scheduled for later in the week. That means that I'll be spending more time
Posted by Nicholas Allen | 0 Comments
Wednesday, March 28, 2007 5:00 AM

Writing Channel Manager Essentials

Once you've obtained a channel manager from the binding element, you have the first object that is usable for network communication. Although the two kinds of channel managers, channel factories and channel listeners, share many of the same methods, the
Posted by Nicholas Allen | 1 Comments
Tuesday, March 27, 2007 5:00 AM

Writing Binding Element Essentials

We're back to the channel development series for another pair of days. When I left off, I promised to talk a bit about writing binding elements and channel managers. Today's article is about writing binding elements and tomorrow's article is about writing
Posted by Nicholas Allen | 1 Comments
Thursday, March 22, 2007 5:00 AM

Responding to GetProperty

I've created a custom implementation of GetProperty for my binding but now I'm getting errors when I go to use the channels. Why is the validation for these channels failing? This is an implementation problem that I've talked about in the past. There
Posted by Nicholas Allen | 1 Comments
Tuesday, March 13, 2007 5:00 AM

Channel Writing Checklist (Optional)

Let's fill in some of the spaces around yesterday's checklist with a list of additional features for a custom channel. Nothing that's been added to this list is required to actually send or receive messages. By doing the things listed here, you can enable
Posted by Nicholas Allen | 1 Comments
Monday, March 12, 2007 5:00 AM

Channel Writing Checklist (Required)

This pair of articles marks the checkpoint between the "big picture" introductory segments and the segments where we actually start getting down into the code. The transition is going to be gradual so there's still some philosophy left, particular around
Posted by Nicholas Allen | 1 Comments
Tuesday, February 20, 2007 5:00 AM

When to Write a Channel

Today's article is about the tension between two simple points. Writing channels can generally be used to solve just about any problem in WCF Writing channels is generally the most time-consuming way to solve a problem in WCF The key inference that you
Posted by Nicholas Allen | 4 Comments
Wednesday, January 17, 2007 5:00 AM

Faking Channel Security

I occasionally see people asking how they can fake the security capabilities of a binding. These questions often start off with "I'm getting an error message that a message's required protection level is not being met". Now, I'm not precisely sure why
Posted by Nicholas Allen | 5 Comments
Friday, January 05, 2007 5:00 AM

Designing New Faults

The last piece of this eleven part series on fault messages covers advice for channel authors that need to define their own set of faults. Everything here assumes that you're writing a protocol channel, that you have interesting failure cases that need
Posted by Nicholas Allen | 5 Comments
Thursday, December 07, 2006 5:00 AM

ListenUriBindingElement

The story from yesterday: there is an important setting for composite duplex that is only settable through the binding context. Unfortunately, proxy clients automatically create and use their own binding context so there is no convenient time to poke
Posted by Nicholas Allen | 3 Comments
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