Recent trend towards bringing asynchronous messaging closer to scripting world is very encouraging (in my opinion) as it will bring completely new programming concepts to script developers and much wider adoption of asynchronous messaging patterns.
Apache ActiveMQ is the most popular and powerful open source Message Broker and Enterprise Integration Patterns provider. Apache ActiveMQ is fast, supports many Cross Language Clients and Protocols, comes with easy to use Enterprise Integration Patterns
Asynchronous method invocation and callback support by Lingo is an awesome feature and there are several usecases where these are an absolute must. Lets consider a simple and rather common use case : You have a server side application (say an optimizer) f