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SEDA is an acronym for staged event-driven architecture, and
decomposes a complex, event-driven application into a set of
stages connected by queues. This design
avoids the high overhead associated with thread-based concurrency
models, and decouples event and thread scheduling from application
logic. By performing admission control on each
event queue, the service can be well-conditioned to load, preventing
resources from being overcommitted when demand exceeds service
capacity.
SEDA employs dynamic control to automatically tune runtime parameters
(such as the scheduling parameters of each stage), as well as to
manage load, for example, by performing adaptive load shedding.
Decomposing services into a set of stages also enables modularity and
code reuse, as well as the development of debugging tools for complex
event-driven applications.