Refactor channel connectivity to avoid multiple spin loops #380
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The current Swift implementation of the gRPC channel's connectivity observer spins up a new ConnectivityObserver instance which then starts a new "spin loop" thread and continually runs, observing changes to the underlying gRPC Core channel's connectivity and piping those back through a callback closure. This means that there's a new spin loop spun up for each observer for each channel. We can avoid having to spin up multiple spin loops for each observer (keeping only 0 or 1 per channel) by allowing a single ConnectivityObserver instance to pipe changes back to multiple callbacks.
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@MrMage thank you for the review! Updated with feedback addressed if you'd like to take another look |
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Just noticed what looks like an existing issue where |
MrMage
approved these changes
Feb 26, 2019
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The current Swift implementation of the gRPC channel's connectivity observer spins up a new ConnectivityObserver instance which then starts a new "spin loop" thread and continually runs, observing changes to the underlying gRPC Core channel's connectivity and piping those back through a callback closure. This means that there's a new spin loop spun up for each observer for each channel.
We can avoid having to spin up multiple spin loops for each observer (keeping only 0 or 1 per channel) by allowing a single ConnectivityObserver instance to pipe changes back to multiple callbacks.