Improve event loop locality of client requests #11300
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Also adds cancellation support to ExecutionFlow.
Implement "proper" context propagation in the client to get rid of the old ClientServerContextFilter. Because context propagation uses its own key for the reactor context instead of ServerRequestContext.KEY, I've deprecated ServerRequestContext.KEY and added a more general API that can use the propagated context from the ContextView.
- In toPublisher, return a specialized FlowAsMono that (a) directly extends Mono so does not need a reactor wrapper and (b) supports SYNC fusion so that when the flow completes after the toPublisher call but before subscribe, we can take advantage of reactor fusion operations. - Introduce a new method fromPublisherEager that can unwrap FluxAsMono directly (to short-circuit the direct ExecutionFlow->Publisher->ExecutionFlow transform) but can also transform Monos that complete immediately (e.g. Mono.just(…).map(…)) directly to ImperativeExecutionFlow.
If a request is made on an event loop that is part of the same event loop group that the client is configured to use, prefer making the connection on that same event loop. This keeps all the relevant processing on the same thread and may improve performance.
graemerocher
approved these changes
Nov 11, 2024
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If a request is made on an event loop that is part of the same event loop group that the client is configured to use, prefer making the connection on that same event loop. This keeps all the relevant processing on the same thread and may improve performance.