Comments (8)
Sure - I think a little toy HTTP server would make sense as a decent example.
from rust-zipkin.
If you have an OpenSpan
and want to fully transfer it to the other thread, you can use the detach
and attach
methods:
let span = my_tracer.next_span()
.with_name("background-thingy")
.detach();
thread::spawn(move || {
let span = span.attach();
// do stuff...
});
If you don't have an OpenSpan
(or have one but don't want to transfer ownership), you can just grab the context from it and send that to the other thread:
let context = current_guard.context();
thread::spawn(move || {
let current_guard = tracer.set_current(context);
// do stuff...
});
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In particular I'm wanting to see how to transfer contexts across threads. Since CurrentGuard can't be Send, I'm missing what the pattern in practice looks like
from rust-zipkin.
In that first example, does the span information associated with "background-thing" get discarded when detaching? It seems the both detach/attach operations discard any built up span state. When attaching, it seems all operations on the open span would have no effect. I'm I understanding this right?
from rust-zipkin.
No, attaching and detaching doesn't discard any state. The only thing it changes is if the OpenSpan acts as a CurrentGuard in addition.
from rust-zipkin.
I'm looking to understand the use of mem::replace
here
from rust-zipkin.
Detach consumes the old OpenSpan by value and returns a new one with the span's state.
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Ah I see. Thanks!
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