refactor: Use ValueTask on plumbing methods #185
Closed
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
austindrenski
force-pushed
the
value-task
branch
2 times, most recently
from
adaf67d
to
e7d66d0
Compare
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #185 +/- ##
=========================================
+ Coverage 0 94.11% +94.11%
=========================================
Files 0 23 +23
Lines 0 951 +951
Branches 0 101 +101
=========================================
+ Hits 0 895 +895
- Misses 0 32 +32
- Partials 0 24 +24 ☔ View full report in Codecov by Sentry. |
Signed-off-by: Austin Drenski <austin@austindrenski.io>
Switch to ValueTask on methods that are likely to complete synchronously and/or be populated with contrib-/user-provided delegates. Signed-off-by: Austin Drenski <austin@austindrenski.io>
austindrenski
force-pushed
the
value-task
branch
from
e7d66d0
to
0c7fabf
Compare
|
I've started updating this and #184 |
|
Closing and continuing with #268 |
toddbaert
added a commit
that referenced
this pull request
Jun 17, 2024
This PR is a combination of #184 and #185. Changes include: - adding cancellation tokens - in all cases where async operations include side-effects (`setProviderAsync`, `InitializeAsync`, I've specified in the in-line doc that the cancellation token's purpose is to cancel such side-effects - so setting a provider and canceling that operation still results in that provider's being set, but async side-effect should be cancelled. I'm interested in feedback here, I think we need to consider the semantics around this... I suppose the alternative would be to always ensure any state changes only occur after async side-effects, if they weren't cancelled beforehand. - adding "Async" suffix to all async methods - remove deprecated sync `SetProvider` methods - Using `ValueTask` for hook methods - I've decided against converting all `Tasks` to `ValueTasks`, from the [official .NET docs](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.valuetask?view=net-8.0): > the default choice for any asynchronous method that does not return a result should be to return a [Task](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task?view=net-8.0). Only if performance analysis proves it worthwhile should a ValueTask be used instead of a [Task](https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.task?view=net-8.0). - I think for hooks, `ValueTask` especially makes sense since often hooks are synchronous, in fact async hooks are probably the less likely variant. - I've kept the resolver methods as `Task`, but there could be an argument for making them `ValueTask`, since some providers resolve asynchronously. - I'm still a bit dubious on the entire idea of `ValueTask`, so I'm really interested in feedback here - associated test updates UPDATE: After chewing on this for a night, I'm starting to feel: - We should simply remove cancellation tokens from Init/Shutdown. We can always add them later, which would be non-breaking. I think the value is low and the complexity is potentially high. - ValueTask is only a good idea for hooks, because: - Hooks will very often be synchronous under the hood - We (SDK authors) await the hooks, not consumer code, so we can be careful of the potential pitfalls of ValueTask. I think everywhere else we should stick to Task. --------- Signed-off-by: Austin Drenski <austin@austindrenski.io> Signed-off-by: Todd Baert <todd.baert@dynatrace.com> Co-authored-by: Austin Drenski <austin@austindrenski.io> Co-authored-by: André Silva <2493377+askpt@users.noreply.github.com> Co-authored-by: Ryan Lamb <4955475+kinyoklion@users.noreply.github.com>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Switch to
ValueTaskon methods that are likely to complete synchronously and/or be populated with contrib-/user-provided delegates.See: #184
This follows #184 with an idea (probably best punted for post-
2.0.0) to switch plumbing-type methods fromTasktoValueTaskto take advantage of the zero-cost-sync-completion sugar that thedotnet/runtimefolks have generously given us to play with.I've got a bigger PR planned where I'll propose returning
ValueTask<T>on theIFeatureClientmethods in order to hide a TTL caching layer that users can use to amortize provider requests (e.g. users could configureIFeatureClientto cache a value for flagKforNseconds, and for thoseNseconds any subsequent requests to anyIFeatureClientfor flagKwould result in a sync read from a memory cache).But that's for later, and for now this PR just looks to make those user-/contrib-provided plumbing methods super lightweight on the scalding hotpath.