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Wednesday, August 12, 2009 5:00 AM

What’s New in WCF 4: Channels

As we get closer to the release of .Net 4 it becomes easier to talk about exactly what new features we’re planning to provide. This list is a bit different in places from what you’ve seen in the beta 1 release and there’s always a chance that things might
Posted by Nicholas Allen | 8 Comments
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Friday, July 24, 2009 5:00 AM

Finding Free Ports, Part 2

Yesterday I talked about the algorithm the TCP transport uses to reserve a unique port when listening on both IPv4 and IPv6 addreses is enabled for a service. Why are the random port numbers drawn from the range 49152-65535? Because that’s the range the
Posted by Nicholas Allen | 0 Comments
Thursday, July 23, 2009 5:00 AM

Finding Free Ports

One of the options for the listen URI for the TCP transport is to let the transport make the address unique by filling in details such as the port number. The socket API allows specifying a wildcard port but at the time WCF was written the wildcard port
Posted by Nicholas Allen | 2 Comments
Tuesday, July 21, 2009 5:00 AM

Top Down Binding Element Order

Why does a message encoder have to be specified before the transport when constructing a binding? A message encoder doesn’t directly fit into a channel stack because the message encoder type doesn’t implement any of the channel shapes. Instead, a message
Posted by Nicholas Allen | 0 Comments
Tuesday, June 02, 2009 5:00 AM

Just Exactly What You Asked For

When implementing a transport or layered channel class the marker used to indicate that your class is a channel is to implement the IChannel interface. Therefore, all channels will implement one of the known channel shapes: IInputChannel, IOutputChannel,
Posted by Nicholas Allen | 0 Comments
Wednesday, May 20, 2009 5:00 AM

Levels of Tracing, Part 6

The last article in the levels of tracing series covers the logging of messages at the transport level. Transport level logging generally occurs in the message encoder as that is where the message bytes are actually processed but in some rare cases there
Posted by Nicholas Allen | 0 Comments
Monday, December 08, 2008 5:00 AM

Non-Destructive Queue Receive State Machine

The state machine for a non-destructive receive has some noticeable similarities to the state machine for a general-purpose communication object, but it's intentional for these two state machines to be different. A non-destructive receive tries with minimal
Posted by Nicholas Allen | 0 Comments
Friday, December 05, 2008 5:00 AM

Non-Destructive Queue Receive

You should take the time to understand the earlier articles in the series for context if you haven't already. Future of Queuing An Alternative Queuing Model The three basic operations that we talked about for queuing with non-destructive receives are
Posted by Nicholas Allen | 0 Comments
Thursday, September 11, 2008 5:00 AM

Advanced Windows Debugging

Channel 9 has put up a new video that mostly plugs the Advanced Windows Debugging book by Mario Hewardt and Daniel Pravat. I recommend the book for someone that needs to debug difficult issues dealing with native resources. For most people working with
Posted by Nicholas Allen | 0 Comments
Tuesday, September 02, 2008 5:00 AM

Waiting for Ready Channels

When I create a channel to a service, how do I know when the service is ready to process the data for that channel? A channel doesn't really know what the service is doing. The service might be actively processing the data being sent over the channel.
Posted by Nicholas Allen | 2 Comments
Monday, July 07, 2008 5:00 AM

Adding Headers to a Call

How do I add SOAP headers to an outgoing request? There are a few different ways to add headers to a message depending on how you need to control the header content and where you need to insert the header. I like to think of these methods as being split
Posted by Nicholas Allen | 2 Comments
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
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 | 3 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 | 2 Comments
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