I've composed a series blog entries on Ode architecture, because riftsaw leverages the Ode's bpel runtime, so it applies to the riftsaw project also, hope it will help you easily understood how riftsaw works.
1.
Bpel Compiler and its internal model.
2.
Jacob framework.
3.
Ode's architecture and module introduction.
4.
BpelServer API illustration.
5.
Architecture of simple scheduler module.
Another good BPEL resource is http://bpelresource.com/
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