These are notes from the presentation by Tom Jordahl about BlazeDS.

History lesson. Flex 1.0 introduced MXML. Originally built to be a server-based compiler. Flex 2.0 fine-tuned the product. ActionScript 3 was introduced, the Eclipse-based IDE was developed, and the server-side component was renamed Flex Data Services. That server-side product continued development and was renamed eventually to LiveCycle Data Services. Finally, a free portion was released as BlazeDS. So, its heart and heritage is in the development of Flex.

So what is BlazeDS? The part that lets your Flash/Flex app have remoting and messaging services via web services, remote objects, data push, etc.

Remoting. Used to be Flash Remoting. Allows mx:RemoteObject tag be used to make RPC calls to the server. Allows you to use CFCs and ActionScript or MXML together! Works with Java classes too, but obviously it is very nicely integrated with ColdFusion. This is the most familiar purpose for this kind of tool. But what else can BlazeDS do?

Messaging. Publish and Subscribe functionality becomes trivial. We can have real-time pushes over the web. What exactly does this mean? Your Flash/Flex apps can push data from one client to the next without refreshes or polling the server.

These services use AMF (Action Messaging Format). It is fast and small: Rather than being verbose text, it is a compact binary protocol. Not that you would ever have to know that, because it just happens behind the scenes. And its specs have been released, which means it can be supported by open source and third party developers.

So why would you still get LCDS? Well, you get certified builds with warranty coverage and support. You’re paying for Adobe to back the product. There will even be an LCDS “Community Edition” that will basically be BlazeDS with this support. Somewhat reminiscent to Red Hat vs. CentOS: Why get Red Hat when CentOS is everything Red Hat is? Because Red Hat has official support for its product. So Adobe is making the technology freely available, and giving you the option to pay for support and official builds and bug fixes.

LCDS “Enterprise Edition” is still the mother of data services. This version adds the data management capability of data services.

The installation of ColdFusion 8 gives you the free express edition of LCDS. But this is a single CPU license. If it doesn’t meet your needs, you can configure BlazeDS for ColdFusion 8. But to do this, you WILL have to remove the LCDS Express Edition that installed with CF8. Now, if you’re just using Flash Remoting, there isn’t any burning need to go to BlazeDS with CF8. However, the messaging features have no CPU restrictions with BlazeDS, so if you are using the messaging features, you may want to go with BlazeDS.

What do you use with BlazeDS vs. LCDS? LCDS has the data management features: Real-time data updates, conflict detection, caching, paging, more! RTMP channels: Direct socket connection to server, instead of the more resource-expensive HTTP. Scalability is also better with LCDS.

Tom indicated that Flex and BlazeDS will not be standing still. He certainly implied that Silverlight is in Adobe’s sights by indicating that it is “nipping at [Flex’s] heels”, suggesting that the AIR, Flex, and BlazeDS technologies will be progressing in development at a rapid pace by Adobe.

Tom explained BlazeDS and LCDS very clearly, albeit at a quick pace at first. My development rarely calls for the messaging features that would especially drive me to BlazeDS, but even so, it was beneficial to understand what BlazeDS is and it is good to know even when a product is not needed in your development arsenal, as in my case. For me, I will be using remoting only, so will stick with LCDS Express that comes with CF8.

Thanks, Tom.