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Remove restriction that SpanContext must be a final class, specify creation. #969

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merged 12 commits into from
Sep 26, 2020
Merged

Remove restriction that SpanContext must be a final class, specify creation. #969

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09c18ec
Remove restriction that SpanContext must be a final class
Sep 18, 2020
e5a7786
Methods for SpanContext.
Sep 19, 2020
9bd8dd7
Lint
Sep 19, 2020
1aa7d16
No bookmark?
Sep 19, 2020
e9fafdb
Root span needs sampling
Sep 23, 2020
b04b3d4
Non-root needs sampling too
Sep 23, 2020
7fb7b4b
API-only
Sep 24, 2020
5b5a5df
Update specification/trace/api.md
Sep 24, 2020
ca2a68b
Update specification/trace/api.md
Sep 24, 2020
6c37693
Note
Sep 24, 2020
d36af6c
less is more
Sep 24, 2020
c18cabc
Update specification/trace/api.md
Sep 24, 2020
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11 changes: 10 additions & 1 deletion specification/trace/api.md
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Expand Up @@ -158,7 +158,6 @@ the same `TracerProvider`.

A `SpanContext` represents the portion of a `Span` which must be serialized and
propagated along side of a distributed context. `SpanContext`s are immutable.
`SpanContext` MUST be a final (sealed) class.

The OpenTelemetry `SpanContext` representation conforms to the [W3C TraceContext
specification](https://www.w3.org/TR/trace-context/). It contains two
Expand All @@ -180,6 +179,16 @@ of key-value pairs. TraceState allows multiple tracing
systems to participate in the same trace. It is fully described in the [W3C Trace Context
specification](https://www.w3.org/TR/trace-context/#tracestate-header).

The API must provide methods to create a `SpanContext`. These methods SHOULD be the only way to
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create a `SpanContext` There are three ways to create a `SpanContext`:
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- By generating a new `SpanId`, `TraceId`, and `TraceFlags` when there is no in-process or remote parent.
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- By generating a new `SpanId` and `TraceFlags` and copying the `TraceId` and `TraceState` from
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an in-process parent.
- By accepting values for the `SpanId`, `TraceId`, `TraceFlags`, and `TraceState` for a remote
parent. In this case, the `SpanId`, `TraceId`, and `TraceFlags` must be used as is, and
`TraceState` may be modified based on the rules for modification described below.
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### Retrieving the TraceId and SpanId

The API MUST allow retrieving the `TraceId` and `SpanId` in the following forms:
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