[Observation] Proposal to add a transactional observation of values #2726
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heckj
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Mar 5, 2025
| `AsyncSequence` of values emitted from changes to a property on a given model | ||
| type. For example, DockKit provides `trackingStates` and Group Activities | ||
| provides `localParticipantStates`. These are much like other APIs that provide | ||
| `AsyncSequence` from a model type; they hand crafted to provide events from when |
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| `AsyncSequence` from a model type; they hand crafted to provide events from when | |
| `AsyncSequence` from a model type; they are hand crafted to provide events from when |
| prime for the next call to the iterator's `next` method. | ||
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| The closure has two other features that are important for common usage; firstly | ||
| the closure is typed-throws such that any access to that emission closure will |
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| the closure is typed-throws such that any access to that emission closure will | |
| the closure uses typed-throws such that any access to that emission closure will |
rjmccall
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…aviors and potential edge cases
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@Jumhyn I added a new section for |
jamieQ
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Apr 9, 2025
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| Numerous frameworks in the Darwin SDKs provide APIs for accessing an | ||
| `AsyncSequence` of values emitted from changes to a property on a given model | ||
| type. For example, DockKit provides `trackingStates` and Group Activities |
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given that (AFAICT) the cited examples are closed source, it's not self-evident that they have semantics compatible with what's being proposed here. are you asserting that they do – i.e. these API could be re-implemented with the proposed Observed type? are there open source examples that could be used here instead?
…version for explicitly constructing Observed untilFinished
phausler
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Jun 10, 2025
…acked values over time (#79817) This is an implementation for the feature swiftlang/swift-evolution#2726
phausler
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Jun 11, 2025
…acked values over time (swiftlang#79817) This is an implementation for the feature swiftlang/swift-evolution#2726
stephentyrone
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Jun 12, 2025
…acked values over time (#79817) (#82197) - **Explanation**: This is an implementation for the feature swiftlang/swift-evolution#2726 - **Scope**: This is targeted specifically to the Observation module, no language or runtime changes - **Issues**: - **Original PRs**: #79817 - **Risk**: Low - **Testing**: This was tested in external forms (which need to be merged in) - **Reviewers**: --------- Co-authored-by: Stephen Canon <[email protected]>
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This proposal contains a modification to the Observation module that adds a new type. This type is an
AsyncSequencethat produces values over time by tracking transactional changes to@Observablemarked types.