spring-framework/framework-docs/src
Brian Clozel ef2a403df6 Add PropagationContextElement Kotlin operator
Prior to this commit, the Micrometer context-propagation project would
help propagating information from `ThreadLocal`, Reactor `Context` and
other context objects. This is already well supported for Micrometer
Observations.

In the case of Kotlin suspending functions, the processing of tasks
would not necessarily update the `ThreadLocal` when the function is
scheduled on a different thread.

This commit introduces the `PropagationContextElement` operator that
connects the `ThreadLocal`, Reactor `Context` and Coroutine `Context`
for all libraries using the "context-propagation" project.

Applications must manually use this operator in suspending functions
like so:

```
suspend fun suspendingFunction() {
  return withContext(PropagationContextElement(currentCoroutineContext())) {
    logger.info("Suspending function with traceId")
  }
}
```

Closes gh-35185
2025-09-09 21:42:08 +02:00
..
docs Upgrade to Objenesis 3.4 2024-09-11 17:15:37 +02:00
main Add PropagationContextElement Kotlin operator 2025-09-09 21:42:08 +02:00