chore(components): configure baggage in process

Ref CAMEL-23349

Author: squakez

components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryTracer.java

@@ -108,7 +108,9 @@ public Span create(String spanName, Span parent, SpanContextPropagationExtractor
             if (parent != null) {
                 OpenTelemetrySpanAdapter otelParentSpan = (OpenTelemetrySpanAdapter) parent;
                 builder = builder.setParent(Context.current().with(otelParentSpan.getSpan()));
-                baggage = otelParentSpan.getBaggage();
+                if (baggage.isEmpty()) {
+                    baggage = otelParentSpan.getBaggage();
+                }
             } else {
                 Context current = Context.root();
                 // If the current span was generated by Camel, then, this is a "dirty" context.

components/camel-opentelemetry2/src/test/java/org/apache/camel/opentelemetry2/BaggageInjectionInternalTest.java

@@ -0,0 +1,94 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.opentelemetry2;
+
+import java.io.IOException;
+import java.util.Map;
+
+import io.opentelemetry.api.baggage.Baggage;
+import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.context.Scope;
+import org.apache.camel.CamelContext;
+import org.apache.camel.CamelContextAware;
+import org.apache.camel.Exchange;
+import org.apache.camel.Processor;
+import org.apache.camel.RoutesBuilder;
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.opentelemetry2.CamelOpenTelemetryExtension.OtelTrace;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BaggageInjectionInternalTest extends OpenTelemetryTracerTestSupport {
+
+    Tracer tracer = otelExtension.getOpenTelemetry().getTracer("spanInjection");
+
+    @Override
+    protected CamelContext createCamelContext() throws Exception {
+        OpenTelemetryTracer tst = new OpenTelemetryTracer();
+        tst.setTracer(tracer);
+        tst.setContextPropagators(otelExtension.getOpenTelemetry().getPropagators());
+        tst.setTraceProcessors(true);
+        CamelContext context = super.createCamelContext();
+        CamelContextAware.trySetCamelContext(tst, context);
+        tst.init(context);
+        return context;
+    }
+
+    @Test
+    void testRouteExternalBaggage() throws IOException {
+        template.sendBody("direct:start", "my-body");
+        Map<String, OtelTrace> traces = otelExtension.getTraces();
+        assertEquals(1, traces.size());
+    }
+
+    @Override
+    protected RoutesBuilder createRouteBuilder() {
+        return new RouteBuilder() {
+
+            Scope baggageScope;
+
+            @Override
+            public void configure() {
+                from("direct:start")
+                        .process(new Processor() {
+                            @Override
+                            public void process(Exchange exchange) throws Exception {
+                                // Open the scope to propagate some baggage info
+                                baggageScope = Baggage.current().toBuilder().put("my.id", "9876").build().makeCurrent();
+                            }
+                        })
+                        .routeId("start")
+                        .log("A message")
+                        .process(new Processor() {
+                            @Override
+                            public void process(Exchange exchange) throws Exception {
+                                assertEquals("9876", Baggage.current().getEntryValue("my.id"));
+                            }
+                        })
+                        .to("log:info")
+                        .process(new Processor() {
+                            @Override
+                            public void process(Exchange exchange) throws Exception {
+                                // Close the scope previously opened
+                                baggageScope.close();
+                            }
+                        });
+            }
+        };
+    }
+}