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Thursday, May 01, 2008 5:00 AM

TIBCO Announces WCF Integration

At their user conference in San Francisco yesterday, TIBCO announced two integration initiatives to bring the TIBCO and Microsoft platforms closer together. TIBCO is developing a TIBCO EMS transport channel for WCF. Although Microsoft doesn't have a formal
Posted by Nicholas Allen | 2 Comments
Monday, April 21, 2008 5:00 AM

Context Channel Shapes

What channels can be used in a context binding? The primary limitation for building a context binding is that the channel stack has to have the right shape. The context exchange protocol used by a context binding requires that the first invoked operation
Posted by Nicholas Allen | 1 Comments
Tuesday, April 01, 2008 5:00 AM

The Pipe DACL

When a named pipe channel listener creates a new named pipe it has to supply a discretionary ACL that describes who can connect to the pipe. Here is how that DACL is constructed: An access control entry is added to deny GENERIC_ALL access to the well-known
Posted by Nicholas Allen | 1 Comments
Monday, January 28, 2008 5:00 AM

A Proxy Proxy Factory

I have a system that sometimes uses a fast local object and sometimes needs to communicate over a network. I have built a proxy object that wraps the proxy factory for creating typed proxies together with a proxy factory for creating local objects. Are
Posted by Nicholas Allen | 3 Comments
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Tuesday, December 18, 2007 5:00 AM

Concurrent Channel Performance

Being thread-safe is different than being concurrent. The channel interfaces are thread-safe so that multiple callers can use them at the same time without getting garbled messages. However, if multiple callers try to send messages on a single channel
Posted by Nicholas Allen | 1 Comments
Monday, November 05, 2007 5:00 AM

Custom Transport Retry Logic

What are the best practices for building retry logic around network transport failures? Let's define some terms first so that we have a common language for communication. I'll say that "retry logic" is any automatically applied compensation activity that
Posted by Nicholas Allen | 6 Comments
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Friday, October 26, 2007 5:00 AM

Substituting for TryAccept

We're back to the channel pump for another round. In the previous channel pump article we had introduced an asynchronous coroutine between the main channel pump loop and a callback on acquiring a channel throttle. This use of coroutines let us suspend
Posted by Nicholas Allen | 1 Comments
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Thursday, October 25, 2007 5:00 AM

No Session Before Sending

When you create a sessionful channel, that implies the existence of some correlation factor for all of the messages that are associated with the session. For example, the correlation factor for a TCP session is that all of the messages travel over the
Posted by Nicholas Allen | 1 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 09, 2007 5:00 AM

Unblocking Flow Throttles

Last time, we were looking at how to control flow through a channel pump by introducing the concept of a throttle. The implementation of the throttle was a semaphore, allowing us to limit the number of channels active in the system at any point in time.
Posted by Nicholas Allen | 3 Comments
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Monday, October 08, 2007 5:00 AM

Flow Throttles

When programming using channels, the common usage pattern for the server is to sit in a loop accepting channels. This loop, sometimes called a pump, cycles through each time accepting a channel and initiating some work. Let's look at the most basic channel
Posted by Nicholas Allen | 2 Comments
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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, August 14, 2007 5:00 AM

Creating Sessions over HTTP

I've got a sessionful contract that I want to use with HTTP. How do I get the HTTP transport to produce a sessionful channel shape? The basic design principle of channels is that they produce whatever channel shape is their natural message exchange pattern.
Posted by Nicholas Allen | 5 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
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