BT

InfoQ Homepage News Hyper-communication in Silverlight 4

Hyper-communication in Silverlight 4

Bookmarks

For better bi-directional communication, a new communication protocol, Net.TCP, was introduced since .NET Framework 3.0 as part of WCF. Net.TCP is now available in the coming Silverlight 4 improving the throughput and the number of connections many times compared to HTTP Polling Duplex.

Silverlight 3 has introduced the option to bind to HTTP Duplex Services which allows the application to constantly poll the service for updates simulating a duplex communication that way. Silverlight 4 introduces a better solution, the Net.TCP Port Sharing Service. Different from HTTP, Net.TCP offers native duplex communication with significant performance gains resulting in application improvements. The ports opened can be shared between multiple applications, but they are limited to the range 4502-4534 as for any other port access in Silverlight.

According to Tomasz Janczuk, a Development Manager working on WCF at Microsoft, Net.TCP offers significant improvements over HTTP Duplex in the following areas:

  • throughput – 5.5 times higher for the UI thread and 870 times higher for the worker thread
  • maximum number of clients – 5-6 times more connected clients supported by a server

The protocol is suitable for Silverlight applications where communication speed is very important. One major drawback is that it uses a series of ports usually blocked by firewalls so it is not suitable for public, external, applications but rather for intranet ones. Another problem is that SSL is not supported making it unsecure, issues that Janczuk mentioned to be addressed in the future.

Related resource: SOAP/TCP Transport for WCF.

Rate this Article

Adoption
Style

Hello stranger!

You need to Register an InfoQ account or or login to post comments. But there's so much more behind being registered.

Get the most out of the InfoQ experience.

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Community comments

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

BT

Is your profile up-to-date? Please take a moment to review and update.

Note: If updating/changing your email, a validation request will be sent

Company name:
Company role:
Company size:
Country/Zone:
State/Province/Region:
You will be sent an email to validate the new email address. This pop-up will close itself in a few moments.