What is a VM transport in the context of an ESB?

I'm reading the Mule ESB documentation, and there is a lot of references to VM Queues. Is this some sort of JMS implementation? What开发者_如何学Go is meant by it, and where can I find more info?

Thanks in advance,

It is a Mule specific transport for messaging within the same VM (i.e. the mule standalone server or the tomcat instance mule has been deployed to). The transport can implement queuing with in-memory or on-disk storage, but there aren't any reliability guarantees.

See here:

http://www.mulesoft.org/documentation/display/MULE2USER/VM+Transport

http://mulesux.tumblr.com/post/3102264921/murphys-law-or-dropping-the-ball

I've never worked with Mule, but I read some docs a few years ago.

I believe VM queues would reside in memory within the JVM. I think it's a way to use SOA constructs between Java Beans, so that local POJO methods can be treated as services. That way, if you some day want to replace that POJO with an external service or host it elsewhere, you only have to change the configuration of that service.

This is all conjecture from the small amount of Mule I recall, so definitely verify, verify, verify. :-)