Externalizing Java Server Concurrency With CAL

One of the most important decisions about the architecture of a server program is its concurrency mechanisms. However, a good concurrency model for general-purpose server programs is increasingly difficult to conceive as the runtime conditions are hard to predict. This paper advocates that the concurrency code is to be decoupled from server programs. To enable such separation, this paper proposes and evaluate CAL, - the Concurrency Aspect Library. CAL provides uniform concurrency programming abstractions and mediates the intrinsic differences among concurrency models.