squakez commented on PR #22677:
URL: https://github.com/apache/camel/pull/22677#issuecomment-4281691600
We should have all the elements required to make it works. I have some POC
that could be good. Here the deal:
You can "decorate" your route with some headers (or property), for example:
```
@Override
public void configure() {
from("direct:start")
.routeId("start")
.log("A message")
.process(new Processor() {
@Override
public void process(Exchange exchange) throws
Exception {
exchange.getIn().setHeader("BAGGAGE_XYZ",
"fake");
}
})
.process(new Processor() {
@Override
public void process(Exchange exchange) throws
Exception {
exchange.getIn().setHeader("operation",
"fake");
}
})
.to("log:info");
}
```
on the otel side (hence, neither touching the general abstraction), we could
introduce a check to evaluate the presence of those headers:
```
...
if (extractor.get("BAGGAGE_XYZ") != null) {
baggage = baggage.toBuilder().put("XYZ", "my-val").build();
}
System.out.println("********** Span (" + spanName + ") baggage "
+ baggage);
return new OpenTelemetrySpanAdapter(builder.startSpan(),
baggage);
```
In this way the baggage is going to be correctly propagated:
```
********** Span (start) baggage {}
********** Span (start) baggage {camelScope=ImmutableEntry{value=true,
metadata=ImmutableEntryMetadata{value=}}}
********** Span (log1-log) baggage {camelScope=ImmutableEntry{value=true,
metadata=ImmutableEntryMetadata{value=}}}
********** Span (process1-process) baggage
{camelScope=ImmutableEntry{value=true, metadata=ImmutableEntryMetadata{value=}}}
********** Span (process2-process) baggage {XYZ=ImmutableEntry{value=my-val,
metadata=ImmutableEntryMetadata{value=}}, camelScope=ImmutableEntry{value=true,
metadata=ImmutableEntryMetadata{value=}}}
********** Span (to1-to) baggage {XYZ=ImmutableEntry{value=my-val,
metadata=ImmutableEntryMetadata{value=}}, camelScope=ImmutableEntry{value=true,
metadata=ImmutableEntryMetadata{value=}}}
********** Span (log) baggage {XYZ=ImmutableEntry{value=my-val,
metadata=ImmutableEntryMetadata{value=}}, camelScope=ImmutableEntry{value=true,
metadata=ImmutableEntryMetadata{value=}}}
```
I think this one could be a nice solution and it would introduce the
possibility to "program" the baggage in whichever DSL, not necessarily in Java,
and, above all, without the need to know the programming concepts of Otel.
wdyt?
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