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"Service Component Architecture", SCA; is it worth it; at this time?
Popularity and Adoption of SCA
Adoption has been limited to the supporters of the specification. To make matters worse, IBM, Oracle (BEA) ended up building their own proprietary SCA implementations (runtimes and extensions to the SCA programming model) to run their own SOA-related product offerings. So, if you build on top of these proprietary implementations, vendor lock-in is a given and you compromise portability of your composites/services.
Contrary to the above, there are some open implementations like Fabric3 and Apache Tuscany. Portability remains a question even with these open implementations because of non-standard extensions to the OASIS SCA specifications.
Google searches on SCA return results that are dated (pre-2009).
Process messages in parallel with the option of processing messages in a "certain group" in sequence. The solution needs to work in a cluster.
Problem Statement
You want to process a stream of messages in parallel, which would mean processing messages out of sequence. That would be fine in general, but you would want to process messages in a group sequentially in order. For example, you might process orders in parallel and sequencing might not matter between differen orders. But would like to process amendments to the same order in sequence.
Solution
Spring Integration Resequencer
Locking mechanism in the Resequencer is local to the JVM and will not work in the cluster; possible alternatives could be (as mentioned in Resequencer MessageGroup Lock