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B3PropagatorInjectorMultipleHeaders.java
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B3PropagatorInjectorMultipleHeaders.java
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/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.extension.trace.propagation;
import static io.opentelemetry.extension.trace.propagation.B3Propagator.SAMPLED_HEADER;
import static io.opentelemetry.extension.trace.propagation.B3Propagator.SPAN_ID_HEADER;
import static io.opentelemetry.extension.trace.propagation.B3Propagator.TRACE_ID_HEADER;
import io.opentelemetry.api.trace.Span;
import io.opentelemetry.api.trace.SpanContext;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.propagation.TextMapSetter;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
@Immutable
final class B3PropagatorInjectorMultipleHeaders implements B3PropagatorInjector {
private static final Collection<String> FIELDS =
Collections.unmodifiableList(Arrays.asList(TRACE_ID_HEADER, SPAN_ID_HEADER, SAMPLED_HEADER));
@Override
public <C> void inject(Context context, @Nullable C carrier, TextMapSetter<C> setter) {
if (context == null) {
return;
}
if (setter == null) {
return;
}
SpanContext spanContext = Span.fromContext(context).getSpanContext();
if (!spanContext.isValid()) {
return;
}
String sampled = spanContext.isSampled() ? Common.TRUE_INT : Common.FALSE_INT;
if (Boolean.TRUE.equals(context.get(B3Propagator.DEBUG_CONTEXT_KEY))) {
setter.set(carrier, B3Propagator.DEBUG_HEADER, Common.TRUE_INT);
sampled = Common.TRUE_INT;
}
setter.set(carrier, TRACE_ID_HEADER, spanContext.getTraceId());
setter.set(carrier, SPAN_ID_HEADER, spanContext.getSpanId());
setter.set(carrier, SAMPLED_HEADER, sampled);
}
@Override
public Collection<String> fields() {
return FIELDS;
}
@Override
public String toString() {
return "B3PropagatorInjectorMultipleHeaders";
}
}