A Library for Asynchronous Concurrent Service Orchestration

With the emergence of service oriented architecture, service orchestration has been an important paradigm of building large-scale distribute systems. The performance of orchestrating services is critical to the entire system. Meanwhile,with the growing complexity the programmability of writing service orchestration program has became a pressing concern. In this paper, we presents a service orchestration library which provides C# function API for orchestration constructs derived from the web-service workflow language WS-BPEL. The library implements those constructs by mapping WS-BPEL concurrent semantic into asynchronous events and join-patterns provided in Microsoft CCR; meanwhile the library provides the abstraction to ease the service orchestration programming. We will demonstrate how to use this library together with Microsoft DSS, a lightweight service runtime, to program service workflows which can efficiently scale to platforms from single multicore CPU, to clusters of distributed computers.