Add RunInChildContextAsync#2370
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Adds child-context support to the .NET Durable Execution SDK. A child context is a logical sub-workflow with its own deterministic operation-ID space, persisted as a CONTEXT operation so subsequent invocations replay the cached value without re-executing the function. Public surface: - IDurableContext.RunInChildContextAsync<T> (reflection + AOT-safe ICheckpointSerializer<T> overloads, plus a void overload). - ChildContextConfig with SubType (observability label) and ErrorMapping (transform exceptions before they surface to the caller). - ChildContextException for failure surfacing. Used as a building block for upcoming WaitForCallbackAsync. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
RunInChildContextAsynctoIDurableContext(3 overloads: reflection, AOT-safeICheckpointSerializer<T>, and void-returning).ChildContextConfig(SubTypefor observability,ErrorMappingfor exception remapping) andChildContextExceptionfor failure surfacing.Internal/ChildContextOperation<T>mirroring the Step/Wait pattern: sync-flush CONTEXT START → run user func → emit SUCCEED with serialized result, or FAIL with error and throwChildContextException. Replay: SUCCEEDED returns cached value, FAILED throws (afterErrorMapping), STARTED/PENDING re-runs the func and lets the child's own operations replay from their own checkpoints.LambdaDurableServiceClient.MapFromSdkOperationto copyContextDetails(Result+Error).This is a building block for upcoming
WaitForCallbackAsync, which (per the Java/JS reference SDKs) wrapsCreateCallbackAsync+ a submitter step inside a child context for observability and clean error mapping.Test plan
ChildContextOperationTests.cscovering: fresh execution + checkpoint emission, deterministic child operation IDs, replay SUCCEEDED, replay FAILED (with and withoutErrorMapping), suspended child (Wait inside child propagates termination), replay STARTED with completed inner step, void overload, AOT-safe serializer overload.🤖 Generated with Claude Code