Building a Pub/Sub Message Bus with WCF and MSMQ

re: Building a Pub/Sub Message Bus with WCF and MSMQ

Udi Dahan - The Software Simplist — Sat, 17 May 2008 14:50:28 GMT

Tom,

Great post. Very thorough. I was curious if you were using the same kind of API's for regular inter-service communication (one way over MSMQ).

There's an open source project (mine, I admit it) that provides a framework for the things you described above.

It's called nServiceBus.

It supports subscribers joining and leaving dynamically without any changes to the publisher (no config changes either), and has a bunch of other functionality as well.

I'd be happy to hear any feedback you might have given the experiences you've outlined in your post.

The site is <a href="http://www.nServiceBus.com">www.nServiceBus.com</a>.

Thanks.

"BizTalk" without BizTalk

Adlai Maschiach — Sun, 18 May 2008 08:10:45 GMT

"BizTalk" without BizTalk Ok , with this kind of opening Title you would have a high expectations

re: Building a Pub/Sub Message Bus with WCF and MSMQ

tomholl — Sun, 18 May 2008 11:52:46 GMT

Hi Udi -

Thanks for sending the link - I'll take a look at nServiceBus - looks very interesting from a quick glance.

The pub/sub framework I worked on a few years ago actually included dynamic subscription management. However for both that system and my current project I believe this feature is overkill - new subscribers are only going to appear after careful consideration and testing, and when this happens it's not at all taxing to update a couple of config files. That said I realise some environments are more dynamic, so dynamic subscription management does have its place.

On my current project we're using the MSMQ pub/sub for some calls, and synchronous calls (currently using HTTP, but likely to be TCP by the time we deploy) for others. The key consideration is whether the service's response needs to be relayed to the end user immediately or not - we're trying to make as much processing asynchronous as possible but in many cases we found that it just isn't practical.

Tom

re: Building a Pub/Sub Message Bus with WCF and MSMQ

Udi Dahan — Sun, 18 May 2008 23:14:29 GMT

Tom,

I guess my question is why you'd want a different programming model for handling a notification arriving and for handling a regular command message? I mean, a message arrives, fire off a message handler.

The issue of immediacy seems to be more about how fast you respond, in other words, keeping latency low but under a high throughput. It has been my experience that that is easier to do using a one-way-only messaging model (at least, server-side).

One last thing that I've found that helps move the practical side of pub/sub forward is caching. That way, most regular request/response semantics are replaced with local cache access while that cache is kept up to date by notifications.

Your thoughts?

re: Building a Pub/Sub Message Bus with WCF and MSMQ

tomholl — Mon, 19 May 2008 11:05:18 GMT

Hi Udi -

On the server side, we're not using any custom APIs - it's just a standard WCF service interface so the programming model is no different for "message bus" services or synchronous services.

I'm not sure I understand how you're using one-way services across the board. In situations where the client requires an immediate response (say, to get details of a particular order to show on the UI), synchronous processing seems way simpler. While you can always pair one-way messages into a duplex communication, this creates the need for live endpoints and message correlation on the client side. Am I missing something, or are you talking about a different scenario?

Tom

New and Notable 243

Sam Gentile — Mon, 19 May 2008 15:13:05 GMT

P&P/Design Patterns I have been in a customer situation where I have been using a combination of

re: Building a Pub/Sub Message Bus with WCF and MSMQ

Tom — Wed, 21 May 2008 01:32:53 GMT

Very interesting. There is another interesting pub/sub implementation on http:/www.distributethis.com that is also WCF based.

基于WCF和MSMQ构建发布/订阅消息总线（Pub/Sub Message Bus）

EntLib — Sat, 14 Jun 2008 12:35:08 GMT

本文是翻译Tom Hollander先生的blog文章《Building a Pub/Sub Message Bus with WCF and MSMQ》，对英文blog文章感兴趣的朋友，可以直接访问文章下面的链接。-译者：EntLib.com开源论坛小组。

基于WCF和MSMQ构建发布/订阅消息总线（Pub/Sub Message Bus）

cnblogs.com — Sat, 14 Jun 2008 13:09:23 GMT

基于 WCF 和 MSMQ 构建发布 / 订阅消息总线（ Pub/Sub Message Bus ）本文是翻译Tom Hollander先生的blog文章《Building a Pub/Sub Message

re: Building a Pub/Sub Message Bus with WCF and MSMQ

EntLib.com — Sat, 14 Jun 2008 13:25:45 GMT

If you want to get a Chinese version of this post, please access the following link.

http://forum.entlib.com/Default.aspx?g=posts&t=57

***

如果您想看看这篇post的中文版本，请您访问如下地址（翻译）：

http://forum.entlib.com/Default.aspx?g=posts&t=57

re: Building a Pub/Sub Message Bus with WCF and MSMQ

Miko Lef — Sun, 15 Jun 2008 09:02:14 GMT

This is a well written article, clear and informative.

Today there many Services that are being deployed over the internet.

The new Age of services is in shape of "Software as a service".

In the Message Queue arena you can find Amazon Web Service or OnlineMQ.com.

In the integration arena you can find CapeClear....and much more.

re: Building a Pub/Sub Message Bus with WCF and MSMQ

Christian Weyer — Tue, 24 Jun 2008 21:17:13 GMT

@Tom, regarding http:/www.distributethis.com

Where exactly is that pub/sub implementation? I could not find it on the web page - am I blind?

Thanks.

MSMQ, WCF and IIS: Getting them to play nice (Part 1)

Tom Hollander's blog — Sat, 12 Jul 2008 11:31:44 GMT

A few weeks ago I posted an article describing how my current team built a publish/subscribe message

MSMQ, WCF and IIS: Getting them to play nice (Part 1)

Readed By Wrocław NUG members — Sat, 12 Jul 2008 14:06:53 GMT

A few weeks ago I posted an article describing how my current team built a publish/subscribe message

New and Notable 251

Sam Gentile The World According to MSCOREE — Sat, 12 Jul 2008 18:49:36 GMT

.NET/C#/Functional Programming The very useful CR_Documentor 2.0 has been released with Sandcastle Preview

MSMQ, WCF and IIS: Getting them to play nice (Part 1)[转]

一想天开 — Sun, 28 Sep 2008 11:57:33 GMT

AfewweeksagoIpostedanarticledescribinghowmycurrentteambuiltapublish/subscribemessage...

New and Notable 251

Sam Gentile's Blog — Wed, 03 Dec 2008 00:30:19 GMT

.NET/C#/Functional Programming The very useful CR_Documentor 2.0 has been released with Sandcastle Preview and is now open source code Mathew has a boatload of links, resources, slide deck and code in Aspects of Functional Programming in C# Presentation