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f7f4067968
Rework the internal plumbing of the server. This change does not modify the
exported interfaces or semantics of the package, and all the existing tests
still pass.
The main changes here are to:
- Simplify the interface for subscription indexing with a typed index rather
than a single nested map.
- Ensure orderly shutdown of channels, so that there is no longer a dynamic
race with concurrent publishers & subscribers at shutdown.
- Remove a layer of indirection between publishers and subscribers. This mainly
helps legibility.
- Remove order dependencies between registration and delivery.
- Add documentation comments where they seemed helpful, and clarified the
existing comments where it was practical.
Although performance was not a primary goal of this change, the simplifications
did very slightly reduce memory use and increase throughput on the existing
benchmarks, though the delta is not statistically significant.
BENCHMARK BEFORE AFTER SPEEDUP (%) B/op (B) B/op (A)
Benchmark10Clients-12 5947 5566 6.4 2017 1942
Benchmark100Clients-12 6111 5762 5.7 1992 1910
Benchmark1000Clients-12 6983 6344 9.2 2046 1959