Polish 'Add support for multiple tracing propagation formats'

See gh-35611

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfiguration.java

@@ -167,8 +167,7 @@ public class BraveAutoConfiguration {
 		@Bean
 		@ConditionalOnMissingBean
 		Factory propagationFactory(TracingProperties properties) {
-			return CompositePropagationFactory.create(properties.getPropagation().getEffectiveProducedTypes(),
-					properties.getPropagation().getEffectiveConsumedTypes());
+			return CompositePropagationFactory.create(properties.getPropagation(), null);
 		}
 
 	}
@@ -187,10 +186,9 @@ public class BraveAutoConfiguration {
 		@ConditionalOnMissingBean
 		BaggagePropagation.FactoryBuilder propagationFactoryBuilder(
 				ObjectProvider<BaggagePropagationCustomizer> baggagePropagationCustomizers) {
-			Factory delegate = CompositePropagationFactory.create(BRAVE_BAGGAGE_MANAGER,
-					this.tracingProperties.getPropagation().getEffectiveProducedTypes(),
-					this.tracingProperties.getPropagation().getEffectiveConsumedTypes());
-			FactoryBuilder builder = BaggagePropagation.newFactoryBuilder(delegate);
+			CompositePropagationFactory factory = CompositePropagationFactory
+				.create(this.tracingProperties.getPropagation(), BRAVE_BAGGAGE_MANAGER);
+			FactoryBuilder builder = BaggagePropagation.newFactoryBuilder(factory);
 			baggagePropagationCustomizers.orderedStream().forEach((customizer) -> customizer.customize(builder));
 			return builder;
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/CompositePropagationFactory.java

@@ -19,183 +19,206 @@ package org.springframework.boot.actuate.autoconfigure.tracing;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.function.Predicate;
 import java.util.stream.Stream;
 
 import brave.internal.propagation.StringPropagationAdapter;
 import brave.propagation.B3Propagation;
 import brave.propagation.Propagation;
+import brave.propagation.Propagation.Factory;
 import brave.propagation.TraceContext;
 import brave.propagation.TraceContextOrSamplingFlags;
+import graphql.com.google.common.collect.Streams;
 import io.micrometer.tracing.BaggageManager;
 import io.micrometer.tracing.brave.bridge.W3CPropagation;
 
+import org.springframework.boot.actuate.autoconfigure.tracing.TracingProperties.Propagation.PropagationType;
+
 /**
- * {@link Factory} which supports multiple tracing formats. It is able to configure
- * different formats for injecting and for extracting.
+ * {@link brave.propagation.Propagation.Factory Propagation factory} which supports
+ * multiple tracing formats. It is able to configure different formats for injecting and
+ * for extracting.
  *
  * @author Marcin Grzejszczak
  * @author Moritz Halbritter
+ * @author Phillip Webb
  */
-class CompositePropagationFactory extends Propagation.Factory implements Propagation<String> {
-
-	private final Collection<Propagation.Factory> injectorFactories;
-
-	private final Collection<Propagation.Factory> extractorFactories;
-
-	private final List<Propagation<String>> injectors;
+class CompositePropagationFactory extends Propagation.Factory {
 
-	private final List<Propagation<String>> extractors;
+	private final PropagationFactories injectors;
 
-	private final boolean supportsJoin;
+	private final PropagationFactories extractors;
 
-	private final boolean requires128BitTraceId;
-
-	private final List<String> keys;
+	private final CompositePropagation propagation;
 
 	CompositePropagationFactory(Collection<Factory> injectorFactories, Collection<Factory> extractorFactories) {
-		this.injectorFactories = injectorFactories;
-		this.extractorFactories = extractorFactories;
-		this.injectors = this.injectorFactories.stream().map(Factory::get).toList();
-		this.extractors = this.extractorFactories.stream().map(Factory::get).toList();
-		this.supportsJoin = Stream.concat(this.injectorFactories.stream(), this.extractorFactories.stream())
-			.allMatch(Factory::supportsJoin);
-		this.requires128BitTraceId = Stream.concat(this.injectorFactories.stream(), this.extractorFactories.stream())
-			.anyMatch(Factory::requires128BitTraceId);
-		this.keys = Stream.concat(this.injectors.stream(), this.extractors.stream())
-			.flatMap((entry) -> entry.keys().stream())
-			.distinct()
-			.toList();
-	}
-
-	Collection<Factory> getInjectorFactories() {
-		return this.injectorFactories;
+		this.injectors = new PropagationFactories(injectorFactories);
+		this.extractors = new PropagationFactories(extractorFactories);
+		this.propagation = new CompositePropagation(this.injectors, this.extractors);
 	}
 
-	@Override
-	public List<String> keys() {
-		return this.keys;
+	Stream<Factory> getInjectors() {
+		return this.injectors.stream();
 	}
 
 	@Override
-	public <R> TraceContext.Injector<R> injector(Setter<R, String> setter) {
-		return (traceContext, request) -> {
-			for (Propagation<String> injector : this.injectors) {
-				injector.injector(setter).inject(traceContext, request);
-			}
-		};
+	public boolean supportsJoin() {
+		return this.injectors.supportsJoin() && this.extractors.supportsJoin();
 	}
 
 	@Override
-	public <R> TraceContext.Extractor<R> extractor(Getter<R, String> getter) {
-		return (request) -> {
-			for (Propagation<String> extractor : this.extractors) {
-				TraceContextOrSamplingFlags extract = extractor.extractor(getter).extract(request);
-				if (extract != TraceContextOrSamplingFlags.EMPTY) {
-					return extract;
-				}
-			}
-			return TraceContextOrSamplingFlags.EMPTY;
-		};
+	public boolean requires128BitTraceId() {
+		return this.injectors.requires128BitTraceId() || this.extractors.requires128BitTraceId();
 	}
 
 	@Override
 	@SuppressWarnings("deprecation")
-	public <K> Propagation<K> create(KeyFactory<K> keyFactory) {
-		return StringPropagationAdapter.create(this, keyFactory);
-	}
-
-	@Override
-	public boolean supportsJoin() {
-		return this.supportsJoin;
-	}
-
-	@Override
-	public boolean requires128BitTraceId() {
-		return this.requires128BitTraceId;
+	public <K> Propagation<K> create(Propagation.KeyFactory<K> keyFactory) {
+		return StringPropagationAdapter.create(this.propagation, keyFactory);
 	}
 
 	@Override
 	public TraceContext decorate(TraceContext context) {
-		for (Factory injectorFactory : this.injectorFactories) {
-			TraceContext decorated = injectorFactory.decorate(context);
-			if (decorated != context) {
-				return decorated;
-			}
-		}
-		for (Factory extractorFactory : this.extractorFactories) {
-			TraceContext decorated = extractorFactory.decorate(context);
-			if (decorated != context) {
-				return decorated;
-			}
-		}
-		return super.decorate(context);
+		return Streams.concat(this.injectors.stream(), this.extractors.stream())
+			.map((factory) -> factory.decorate(context))
+			.filter((decorated) -> decorated != context)
+			.findFirst()
+			.orElse(context);
 	}
 
 	/**
 	 * Creates a new {@link CompositePropagationFactory}, which uses the given
 	 * {@code injectionTypes} for injection and {@code extractionTypes} for extraction.
+	 * @param properties the propagation properties
 	 * @param baggageManager the baggage manager to use, or {@code null}
-	 * @param injectionTypes the propagation types for injection
-	 * @param extractionTypes the propagation types for extraction
 	 * @return the {@link CompositePropagationFactory}
 	 */
-	static CompositePropagationFactory create(BaggageManager baggageManager,
-			Collection<TracingProperties.Propagation.PropagationType> injectionTypes,
-			Collection<TracingProperties.Propagation.PropagationType> extractionTypes) {
-		List<Factory> injectors = injectionTypes.stream()
-			.map((injection) -> factoryForType(baggageManager, injection))
-			.toList();
-		List<Factory> extractors = extractionTypes.stream()
-			.map((extraction) -> factoryForType(baggageManager, extraction))
-			.toList();
+	static CompositePropagationFactory create(TracingProperties.Propagation properties, BaggageManager baggageManager) {
+		PropagationFactoryMapper mapper = new PropagationFactoryMapper(baggageManager);
+		List<Factory> injectors = properties.getEffectiveProducedTypes().stream().map(mapper::map).toList();
+		List<Factory> extractors = properties.getEffectiveConsumedTypes().stream().map(mapper::map).toList();
 		return new CompositePropagationFactory(injectors, extractors);
 	}
 
 	/**
-	 * Creates a new {@link CompositePropagationFactory}, which uses the given
-	 * {@code injectionTypes} for injection and {@code extractionTypes} for extraction.
-	 * @param injectionTypes the propagation types for injection
-	 * @param extractionTypes the propagation types for extraction
-	 * @return the {@link CompositePropagationFactory}
+	 * Mapper used to create a {@link brave.propagation.Propagation.Factory Propagation
+	 * factory} from a {@link PropagationType}.
 	 */
-	static CompositePropagationFactory create(Collection<TracingProperties.Propagation.PropagationType> injectionTypes,
-			Collection<TracingProperties.Propagation.PropagationType> extractionTypes) {
-		return create(null, injectionTypes, extractionTypes);
-	}
+	private static class PropagationFactoryMapper {
 
-	private static Factory factoryForType(BaggageManager baggageManager,
-			TracingProperties.Propagation.PropagationType type) {
-		return switch (type) {
-			case B3 -> b3Single();
-			case B3_MULTI -> b3Multi();
-			case W3C -> w3c(baggageManager);
-		};
-	}
+		private final BaggageManager baggageManager;
+
+		PropagationFactoryMapper(BaggageManager baggageManager) {
+			this.baggageManager = baggageManager;
+		}
+
+		Propagation.Factory map(PropagationType type) {
+			return switch (type) {
+				case B3 -> b3Single();
+				case B3_MULTI -> b3Multi();
+				case W3C -> w3c();
+			};
+		}
+
+		/**
+		 * Creates a new B3 propagation factory using a single B3 header.
+		 * @return the B3 propagation factory
+		 */
+		private Propagation.Factory b3Single() {
+			return B3Propagation.newFactoryBuilder().injectFormat(B3Propagation.Format.SINGLE_NO_PARENT).build();
+		}
+
+		/**
+		 * Creates a new B3 propagation factory using multiple B3 headers.
+		 * @return the B3 propagation factory
+		 */
+		private Propagation.Factory b3Multi() {
+			return B3Propagation.newFactoryBuilder().injectFormat(B3Propagation.Format.MULTI).build();
+		}
+
+		/**
+		 * Creates a new W3C propagation factory.
+		 * @return the W3C propagation factory
+		 */
+		private Propagation.Factory w3c() {
+			return (this.baggageManager != null) ? new W3CPropagation(this.baggageManager, Collections.emptyList())
+					: new W3CPropagation();
+		}
 
-	/**
-	 * Creates a new B3 propagation factory using a single B3 header.
-	 * @return the B3 propagation factory
-	 */
-	private static Factory b3Single() {
-		return B3Propagation.newFactoryBuilder().injectFormat(B3Propagation.Format.SINGLE_NO_PARENT).build();
 	}
 
 	/**
-	 * Creates a new B3 propagation factory using multiple B3 headers.
-	 * @return the B3 propagation factory
+	 * A collection of propagation factories.
 	 */
-	private static Factory b3Multi() {
-		return B3Propagation.newFactoryBuilder().injectFormat(B3Propagation.Format.MULTI).build();
+	private static class PropagationFactories {
+
+		private final List<Propagation.Factory> factories;
+
+		PropagationFactories(Collection<Factory> factories) {
+			this.factories = List.copyOf(factories);
+		}
+
+		boolean requires128BitTraceId() {
+			return stream().anyMatch(Propagation.Factory::requires128BitTraceId);
+		}
+
+		boolean supportsJoin() {
+			return stream().allMatch(Propagation.Factory::supportsJoin);
+		}
+
+		List<Propagation<String>> get() {
+			return stream().map(Factory::get).toList();
+		}
+
+		Stream<Factory> stream() {
+			return this.factories.stream();
+		}
+
 	}
 
 	/**
-	 * Creates a new W3C propagation factory.
-	 * @param baggageManager baggage manager to use, or {@code null}
-	 * @return the W3C propagation factory
+	 * A composite {@link Propagation}.
 	 */
-	private static W3CPropagation w3c(BaggageManager baggageManager) {
-		return (baggageManager != null) ? new W3CPropagation(baggageManager, Collections.emptyList())
-				: new W3CPropagation();
+	private static class CompositePropagation implements Propagation<String> {
+
+		private final List<Propagation<String>> injectors;
+
+		private final List<Propagation<String>> extractors;
+
+		private final List<String> keys;
+
+		CompositePropagation(PropagationFactories injectorFactories, PropagationFactories extractorFactories) {
+			this.injectors = injectorFactories.get();
+			this.extractors = extractorFactories.get();
+			this.keys = Stream.concat(keys(this.injectors), keys(this.extractors)).distinct().toList();
+		}
+
+		private Stream<String> keys(List<Propagation<String>> propagations) {
+			return propagations.stream().flatMap((propagation) -> propagation.keys().stream());
+		}
+
+		@Override
+		public List<String> keys() {
+			return this.keys;
+		}
+
+		@Override
+		public <R> TraceContext.Injector<R> injector(Setter<R, String> setter) {
+			return (traceContext, request) -> this.injectors.stream()
+				.map((propagation) -> propagation.injector(setter))
+				.forEach((injector) -> injector.inject(traceContext, request));
+		}
+
+		@Override
+		public <R> TraceContext.Extractor<R> extractor(Getter<R, String> getter) {
+			return (request) -> this.extractors.stream()
+				.map((propagation) -> propagation.extractor(getter))
+				.map((extractor) -> extractor.extract(request))
+				.filter(Predicate.not(TraceContextOrSamplingFlags.EMPTY::equals))
+				.findFirst()
+				.orElse(TraceContextOrSamplingFlags.EMPTY);
+		}
+
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/CompositeTextMapPropagator.java

@@ -19,6 +19,7 @@ package org.springframework.boot.actuate.autoconfigure.tracing;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -32,6 +33,8 @@ import io.opentelemetry.context.propagation.TextMapPropagator;
 import io.opentelemetry.context.propagation.TextMapSetter;
 import io.opentelemetry.extension.trace.propagation.B3Propagator;
 
+import org.springframework.boot.actuate.autoconfigure.tracing.TracingProperties.Propagation.PropagationType;
+
 /**
  * {@link TextMapPropagator} which supports multiple tracing formats. It is able to
  * configure different formats for injecting and for extracting.
@@ -42,9 +45,9 @@ class CompositeTextMapPropagator implements TextMapPropagator {
 
 	private final Collection<TextMapPropagator> injectors;
 
-	private final Collection<TextMapPropagator> mutuallyExclusiveExtractors;
+	private final Collection<TextMapPropagator> extractors;
 
-	private final Collection<TextMapPropagator> alwaysRunningExtractors;
+	private final TextMapPropagator baggagePropagator;
 
 	private final Set<String> fields;
 
@@ -54,19 +57,24 @@ class CompositeTextMapPropagator implements TextMapPropagator {
 	 * @param mutuallyExclusiveExtractors the mutually exclusive extractors. They are
 	 * applied in order, and as soon as an extractor extracts a context, the other
 	 * extractors after it are no longer invoked
-	 * @param alwaysRunningExtractors the always running extractors. They always run in
-	 * order, regardless of the mutually exclusive extractors or whether the extractor
-	 * before it has already extracted a context
+	 * @param baggagePropagator the baggage propagator to use, or {@code null}
 	 */
 	CompositeTextMapPropagator(Collection<TextMapPropagator> injectors,
-			Collection<TextMapPropagator> mutuallyExclusiveExtractors,
-			Collection<TextMapPropagator> alwaysRunningExtractors) {
+			Collection<TextMapPropagator> mutuallyExclusiveExtractors, TextMapPropagator baggagePropagator) {
 		this.injectors = injectors;
-		this.mutuallyExclusiveExtractors = mutuallyExclusiveExtractors;
-		this.alwaysRunningExtractors = alwaysRunningExtractors;
-		this.fields = concat(this.injectors, this.mutuallyExclusiveExtractors, this.alwaysRunningExtractors)
-			.flatMap((entry) -> entry.fields().stream())
-			.collect(Collectors.toSet());
+		this.extractors = mutuallyExclusiveExtractors;
+		this.baggagePropagator = baggagePropagator;
+		Set<String> fields = new LinkedHashSet<>();
+		fields(this.injectors).forEach(fields::add);
+		fields(this.extractors).forEach(fields::add);
+		if (baggagePropagator != null) {
+			fields.addAll(baggagePropagator.fields());
+		}
+		this.fields = Collections.unmodifiableSet(fields);
+	}
+
+	private Stream<String> fields(Collection<TextMapPropagator> propagators) {
+		return propagators.stream().flatMap((propagator) -> propagator.fields().stream());
 	}
 
 	Collection<TextMapPropagator> getInjectors() {
@@ -80,11 +88,8 @@ class CompositeTextMapPropagator implements TextMapPropagator {
 
 	@Override
 	public <C> void inject(Context context, C carrier, TextMapSetter<C> setter) {
-		if (context == null || setter == null) {
-			return;
-		}
-		for (TextMapPropagator injector : this.injectors) {
-			injector.inject(context, carrier, setter);
+		if (context != null && setter != null) {
+			this.injectors.forEach((injector) -> injector.inject(context, carrier, setter));
 		}
 	}
 
@@ -96,99 +101,81 @@ class CompositeTextMapPropagator implements TextMapPropagator {
 		if (getter == null) {
 			return context;
 		}
-		Context currentContext = context;
-		for (TextMapPropagator extractor : this.mutuallyExclusiveExtractors) {
-			Context extractedContext = extractor.extract(currentContext, carrier, getter);
-			if (extractedContext != currentContext) {
-				currentContext = extractedContext;
-				break;
-			}
+		Context result = this.extractors.stream()
+			.map((extractor) -> extractor.extract(context, carrier, getter))
+			.filter((extracted) -> extracted != context)
+			.findFirst()
+			.orElse(context);
+		if (this.baggagePropagator != null) {
+			result = this.baggagePropagator.extract(result, carrier, getter);
 		}
-		for (TextMapPropagator extractor : this.alwaysRunningExtractors) {
-			currentContext = extractor.extract(currentContext, carrier, getter);
-		}
-		return currentContext;
-	}
-
-	/**
-	 * Creates a new {@link CompositeTextMapPropagator}, which uses the given
-	 * {@code injectionTypes} for injection and {@code extractionTypes} for extraction.
-	 * @param injectionTypes the propagation types for injection
-	 * @param extractionTypes the propagation types for extraction
-	 * @return the {@link CompositeTextMapPropagator}
-	 */
-	static TextMapPropagator create(Collection<TracingProperties.Propagation.PropagationType> injectionTypes,
-			Collection<TracingProperties.Propagation.PropagationType> extractionTypes) {
-		return create(null, injectionTypes, extractionTypes);
+		return result;
 	}
 
 	/**
 	 * Creates a new {@link CompositeTextMapPropagator}, which uses the given
 	 * {@code injectionTypes} for injection and {@code extractionTypes} for extraction.
+	 * @param properties the tracing properties
 	 * @param baggagePropagator the baggage propagator to use, or {@code null}
-	 * @param injectionTypes the propagation types for injection
-	 * @param extractionTypes the propagation types for extraction
 	 * @return the {@link CompositeTextMapPropagator}
 	 */
-	static CompositeTextMapPropagator create(TextMapPropagator baggagePropagator,
-			Collection<TracingProperties.Propagation.PropagationType> injectionTypes,
-			Collection<TracingProperties.Propagation.PropagationType> extractionTypes) {
-		List<TextMapPropagator> injectors = injectionTypes.stream()
-			.map((injection) -> forType(injection, baggagePropagator != null))
+	static TextMapPropagator create(TracingProperties.Propagation properties, TextMapPropagator baggagePropagator) {
+		TextMapPropagatorMapper mapper = new TextMapPropagatorMapper(baggagePropagator != null);
+		List<TextMapPropagator> injectors = properties.getEffectiveProducedTypes()
+			.stream()
+			.map(mapper::map)
 			.collect(Collectors.toCollection(ArrayList::new));
 		if (baggagePropagator != null) {
 			injectors.add(baggagePropagator);
 		}
-		List<TextMapPropagator> extractors = extractionTypes.stream()
-			.map((extraction) -> forType(extraction, baggagePropagator != null))
-			.toList();
-		return new CompositeTextMapPropagator(injectors, extractors,
-				(baggagePropagator != null) ? List.of(baggagePropagator) : Collections.emptyList());
-	}
-
-	@SafeVarargs
-	private static <T> Stream<T> concat(Collection<T>... collections) {
-		Stream<T> result = Stream.empty();
-		for (Collection<T> collection : collections) {
-			result = Stream.concat(result, collection.stream());
-		}
-		return result;
+		List<TextMapPropagator> extractors = properties.getEffectiveProducedTypes().stream().map(mapper::map).toList();
+		return new CompositeTextMapPropagator(injectors, extractors, baggagePropagator);
 	}
 
 	/**
-	 * Creates a new B3 propagator using a single B3 header.
-	 * @return the B3 propagator
+	 * Mapper used to create a {@link TextMapPropagator} from a {@link PropagationType}.
 	 */
-	private static TextMapPropagator b3Single() {
-		return B3Propagator.injectingSingleHeader();
-	}
+	private static class TextMapPropagatorMapper {
 
-	/**
-	 * Creates a new B3 propagator using multiple B3 headers.
-	 * @return the B3 propagator
-	 */
-	private static TextMapPropagator b3Multi() {
-		return B3Propagator.injectingMultiHeaders();
-	}
+		private final boolean baggage;
 
-	/**
-	 * Creates a new W3C propagator.
-	 * @param baggage whether baggage propagation should be supported
-	 * @return the W3C propagator
-	 */
-	private static TextMapPropagator w3c(boolean baggage) {
-		if (!baggage) {
-			return W3CTraceContextPropagator.getInstance();
+		TextMapPropagatorMapper(boolean baggage) {
+			this.baggage = baggage;
+		}
+
+		TextMapPropagator map(PropagationType type) {
+			return switch (type) {
+				case B3 -> b3Single();
+				case B3_MULTI -> b3Multi();
+				case W3C -> w3c();
+			};
+		}
+
+		/**
+		 * Creates a new B3 propagator using a single B3 header.
+		 * @return the B3 propagator
+		 */
+		private TextMapPropagator b3Single() {
+			return B3Propagator.injectingSingleHeader();
+		}
+
+		/**
+		 * Creates a new B3 propagator using multiple B3 headers.
+		 * @return the B3 propagator
+		 */
+		private TextMapPropagator b3Multi() {
+			return B3Propagator.injectingMultiHeaders();
+		}
+
+		/**
+		 * Creates a new W3C propagator.
+		 * @return the W3C propagator
+		 */
+		private TextMapPropagator w3c() {
+			return (!this.baggage) ? W3CTraceContextPropagator.getInstance() : TextMapPropagator
+				.composite(W3CTraceContextPropagator.getInstance(), W3CBaggagePropagator.getInstance());
 		}
-		return TextMapPropagator.composite(W3CTraceContextPropagator.getInstance(), W3CBaggagePropagator.getInstance());
-	}
 
-	private static TextMapPropagator forType(TracingProperties.Propagation.PropagationType type, boolean baggage) {
-		return switch (type) {
-			case B3 -> b3Single();
-			case B3_MULTI -> b3Multi();
-			case W3C -> w3c(baggage);
-		};
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/OpenTelemetryAutoConfiguration.java

@@ -187,9 +187,7 @@ public class OpenTelemetryAutoConfiguration {
 			List<String> remoteFields = this.tracingProperties.getBaggage().getRemoteFields();
 			BaggageTextMapPropagator baggagePropagator = new BaggageTextMapPropagator(remoteFields,
 					new OtelBaggageManager(otelCurrentTraceContext, remoteFields, Collections.emptyList()));
-			return CompositeTextMapPropagator.create(baggagePropagator,
-					this.tracingProperties.getPropagation().getEffectiveProducedTypes(),
-					this.tracingProperties.getPropagation().getEffectiveConsumedTypes());
+			return CompositeTextMapPropagator.create(this.tracingProperties.getPropagation(), baggagePropagator);
 		}
 
 		@Bean
@@ -208,8 +206,7 @@ public class OpenTelemetryAutoConfiguration {
 
 		@Bean
 		TextMapPropagator textMapPropagator(TracingProperties properties) {
-			return CompositeTextMapPropagator.create(properties.getPropagation().getEffectiveProducedTypes(),
-					properties.getPropagation().getEffectiveConsumedTypes());
+			return CompositeTextMapPropagator.create(properties.getPropagation(), null);
 		}
 
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/TracingProperties.java

@@ -212,10 +212,7 @@ public class TracingProperties {
 		 * @return the effective context propagation types produced by the application
 		 */
 		List<PropagationType> getEffectiveProducedTypes() {
-			if (this.type != null) {
-				return this.type;
-			}
-			return this.produce;
+			return (this.type != null) ? this.type : this.produce;
 		}
 
 		/**
@@ -224,10 +221,7 @@ public class TracingProperties {
 		 * @return the effective context propagation types consumed by the application
 		 */
 		List<PropagationType> getEffectiveConsumedTypes() {
-			if (this.type != null) {
-				return this.type;
-			}
-			return this.consume;
+			return (this.type != null) ? this.type : this.consume;
 		}
 
 		/**

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfigurationTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.autoconfigure.tracing;
 
 import java.util.Collections;
 import java.util.List;
+import java.util.stream.Stream;
 
 import brave.Span;
 import brave.SpanCustomizer;
@@ -131,8 +132,8 @@ class BraveAutoConfigurationTests {
 		this.contextRunner.run((context) -> {
 			assertThat(context).hasBean("propagationFactory");
 			Factory factory = context.getBean(Factory.class);
-			List<Factory> injectors = getInjectors(factory);
-			assertThat(injectors).extracting(Factory::getClass).containsExactly(W3CPropagation.class);
+			Stream<Class<?>> injectors = getInjectors(factory).stream().map(Object::getClass);
+			assertThat(injectors).containsExactly(W3CPropagation.class);
 			assertThat(context).hasSingleBean(BaggagePropagation.FactoryBuilder.class);
 		});
 	}
@@ -165,8 +166,8 @@ class BraveAutoConfigurationTests {
 		this.contextRunner.withPropertyValues("management.tracing.baggage.enabled=false").run((context) -> {
 			assertThat(context).hasBean("propagationFactory");
 			Factory factory = context.getBean(Factory.class);
-			List<Factory> injectors = getInjectors(factory);
-			assertThat(injectors).extracting(Factory::getClass).containsExactly(W3CPropagation.class);
+			Stream<Class<?>> injectors = getInjectors(factory).stream().map(Object::getClass);
+			assertThat(injectors).containsExactly(W3CPropagation.class);
 			assertThat(context).doesNotHaveBean(BaggagePropagation.FactoryBuilder.class);
 		});
 	}
@@ -270,7 +271,7 @@ class BraveAutoConfigurationTests {
 	private List<Factory> getInjectors(Factory factory) {
 		assertThat(factory).as("factory").isNotNull();
 		if (factory instanceof CompositePropagationFactory compositePropagationFactory) {
-			return compositePropagationFactory.getInjectorFactories().stream().toList();
+			return compositePropagationFactory.getInjectors().toList();
 		}
 		Assertions.fail("Expected CompositePropagationFactory, found %s".formatted(factory.getClass()));
 		throw new AssertionError("Unreachable");

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/CompositePropagationFactoryTests.java

@@ -25,6 +25,7 @@ import brave.internal.propagation.StringPropagationAdapter;
 import brave.propagation.Propagation;
 import brave.propagation.TraceContext;
 import brave.propagation.TraceContextOrSamplingFlags;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
@@ -39,72 +40,80 @@ import static org.mockito.BDDMockito.given;
  */
 class CompositePropagationFactoryTests {
 
-	@Test
-	void returnsAllKeys() {
-		CompositePropagationFactory factory = new CompositePropagationFactory(List.of(field("a")), List.of(field("b")));
-		assertThat(factory.keys()).containsExactly("a", "b");
-	}
-
 	@Test
 	void supportsJoin() {
-		Propagation.Factory supportsJoin = Mockito.mock(Propagation.Factory.class);
-		given(supportsJoin.supportsJoin()).willReturn(true);
-		given(supportsJoin.get()).willReturn(new DummyPropagation("a"));
-		Propagation.Factory doesNotSupportsJoin = Mockito.mock(Propagation.Factory.class);
-		given(doesNotSupportsJoin.supportsJoin()).willReturn(false);
-		given(doesNotSupportsJoin.get()).willReturn(new DummyPropagation("a"));
-		CompositePropagationFactory factory = new CompositePropagationFactory(List.of(supportsJoin),
-				List.of(doesNotSupportsJoin));
+		Propagation.Factory supported = Mockito.mock(Propagation.Factory.class);
+		given(supported.supportsJoin()).willReturn(true);
+		given(supported.get()).willReturn(new DummyPropagation("a"));
+		Propagation.Factory unsupported = Mockito.mock(Propagation.Factory.class);
+		given(unsupported.supportsJoin()).willReturn(false);
+		given(unsupported.get()).willReturn(new DummyPropagation("a"));
+		CompositePropagationFactory factory = new CompositePropagationFactory(List.of(supported), List.of(unsupported));
 		assertThat(factory.supportsJoin()).isFalse();
 	}
 
 	@Test
 	void requires128BitTraceId() {
-		Propagation.Factory requires128BitTraceId = Mockito.mock(Propagation.Factory.class);
-		given(requires128BitTraceId.requires128BitTraceId()).willReturn(true);
-		given(requires128BitTraceId.get()).willReturn(new DummyPropagation("a"));
-		Propagation.Factory doesNotRequire128BitTraceId = Mockito.mock(Propagation.Factory.class);
-		given(doesNotRequire128BitTraceId.requires128BitTraceId()).willReturn(false);
-		given(doesNotRequire128BitTraceId.get()).willReturn(new DummyPropagation("a"));
-		CompositePropagationFactory factory = new CompositePropagationFactory(List.of(requires128BitTraceId),
-				List.of(doesNotRequire128BitTraceId));
+		Propagation.Factory required = Mockito.mock(Propagation.Factory.class);
+		given(required.requires128BitTraceId()).willReturn(true);
+		given(required.get()).willReturn(new DummyPropagation("a"));
+		Propagation.Factory notRequired = Mockito.mock(Propagation.Factory.class);
+		given(notRequired.requires128BitTraceId()).willReturn(false);
+		given(notRequired.get()).willReturn(new DummyPropagation("a"));
+		CompositePropagationFactory factory = new CompositePropagationFactory(List.of(required), List.of(notRequired));
 		assertThat(factory.requires128BitTraceId()).isTrue();
 	}
 
-	@Test
-	void inject() {
-		CompositePropagationFactory factory = new CompositePropagationFactory(List.of(field("a"), field("b")),
-				List.of(field("c")));
-		TraceContext context = context();
-		Map<String, String> request = new HashMap<>();
-		factory.injector(new MapSetter()).inject(context, request);
-		assertThat(request).containsOnly(entry("a", "a-value"), entry("b", "b-value"));
-	}
+	@Nested
+	static class CompostePropagationTests {
 
-	@Test
-	void extractorStopsAfterSuccessfulExtraction() {
-		CompositePropagationFactory factory = new CompositePropagationFactory(Collections.emptyList(),
-				List.of(field("a"), field("b")));
-		Map<String, String> request = Map.of("a", "a-value", "b", "b-value");
-		TraceContextOrSamplingFlags context = factory.extractor(new MapGetter()).extract(request);
-		assertThat(context.context().extra()).containsExactly("a");
-	}
+		@Test
+		void keys() {
+			CompositePropagationFactory factory = new CompositePropagationFactory(List.of(field("a")),
+					List.of(field("b")));
+			Propagation<String> propagation = factory.get();
+			assertThat(propagation.keys()).containsExactly("a", "b");
+		}
 
-	@Test
-	void returnsEmptyContextWhenNoExtractorMatches() {
-		CompositePropagationFactory factory = new CompositePropagationFactory(Collections.emptyList(),
-				Collections.emptyList());
-		Map<String, String> request = Collections.emptyMap();
-		TraceContextOrSamplingFlags context = factory.extractor(new MapGetter()).extract(request);
-		assertThat(context.context()).isNull();
-	}
+		@Test
+		void inject() {
+			CompositePropagationFactory factory = new CompositePropagationFactory(List.of(field("a"), field("b")),
+					List.of(field("c")));
+			Propagation<String> propagation = factory.get();
+			TraceContext context = context();
+			Map<String, String> request = new HashMap<>();
+			propagation.injector(new MapSetter()).inject(context, request);
+			assertThat(request).containsOnly(entry("a", "a-value"), entry("b", "b-value"));
+		}
 
-	private static TraceContext context() {
-		return TraceContext.newBuilder().traceId(1).spanId(2).build();
-	}
+		@Test
+		void extractorWhenDelegateExtractsReturnsExtraction() {
+			CompositePropagationFactory factory = new CompositePropagationFactory(Collections.emptyList(),
+					List.of(field("a"), field("b")));
+			Propagation<String> propagation = factory.get();
+			Map<String, String> request = Map.of("a", "a-value", "b", "b-value");
+			TraceContextOrSamplingFlags context = propagation.extractor(new MapGetter()).extract(request);
+			assertThat(context.context().extra()).containsExactly("a");
+		}
+
+		@Test
+		void extractorWhenWhenNoExtractorMatchesReturnsEmptyContext() {
+			CompositePropagationFactory factory = new CompositePropagationFactory(Collections.emptyList(),
+					Collections.emptyList());
+			Propagation<String> propagation = factory.get();
+			Map<String, String> request = Collections.emptyMap();
+			TraceContextOrSamplingFlags context = propagation.extractor(new MapGetter()).extract(request);
+			assertThat(context.context()).isNull();
+		}
+
+		private static TraceContext context() {
+			return TraceContext.newBuilder().traceId(1).spanId(2).build();
+		}
+
+		private static DummyPropagation field(String field) {
+			return new DummyPropagation(field);
+		}
 
-	private static DummyPropagation field(String field) {
-		return new DummyPropagation(field);
 	}
 
 	private static final class MapSetter implements Propagation.Setter<Map<String, String>, String> {

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/CompositeTextMapPropagatorTests.java

@@ -51,14 +51,14 @@ class CompositeTextMapPropagatorTests {
 	@Test
 	void collectsAllFields() {
 		CompositeTextMapPropagator propagator = new CompositeTextMapPropagator(List.of(field("a")), List.of(field("b")),
-				List.of(field("c")));
+				field("c"));
 		assertThat(propagator.fields()).containsExactly("a", "b", "c");
 	}
 
 	@Test
 	void injectAllFields() {
 		CompositeTextMapPropagator propagator = new CompositeTextMapPropagator(List.of(field("a"), field("b")),
-				Collections.emptyList(), Collections.emptyList());
+				Collections.emptyList(), null);
 		TextMapSetter<Object> setter = setter();
 		Object carrier = carrier();
 		propagator.inject(context(), carrier, setter);
@@ -68,9 +68,9 @@ class CompositeTextMapPropagatorTests {
 	}
 
 	@Test
-	void extractMutuallyExclusive() {
+	void extractWithoutBaggagePropagator() {
 		CompositeTextMapPropagator propagator = new CompositeTextMapPropagator(Collections.emptyList(),
-				List.of(field("a"), field("b")), Collections.emptyList());
+				List.of(field("a"), field("b")), null);
 		Context context = context();
 		Map<String, String> carrier = Map.of("a", "a-value", "b", "b-value");
 		context = propagator.extract(context, carrier, new MapTextMapGetter());
@@ -81,9 +81,9 @@ class CompositeTextMapPropagatorTests {
 	}
 
 	@Test
-	void extractAlwaysRunning() {
+	void extractWithBaggagePropagator() {
 		CompositeTextMapPropagator propagator = new CompositeTextMapPropagator(Collections.emptyList(),
-				List.of(field("a"), field("b")), List.of(field("c")));
+				List.of(field("a"), field("b")), field("c"));
 		Context context = context();
 		Map<String, String> carrier = Map.of("a", "a-value", "b", "b-value", "c", "c-value");
 		context = propagator.extract(context, carrier, new MapTextMapGetter());

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/OpenTelemetryAutoConfigurationTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.autoconfigure.tracing;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Stream;
 
 import io.micrometer.tracing.SpanCustomizer;
 import io.micrometer.tracing.otel.bridge.OtelCurrentTraceContext;
@@ -174,9 +175,8 @@ class OpenTelemetryAutoConfigurationTests {
 	void shouldSupplyB3PropagationIfPropagationPropertySet() {
 		this.contextRunner.withPropertyValues("management.tracing.propagation.type=B3").run((context) -> {
 			TextMapPropagator propagator = context.getBean(TextMapPropagator.class);
-			List<TextMapPropagator> injectors = getInjectors(propagator);
-			assertThat(injectors).extracting(TextMapPropagator::getClass)
-				.containsExactly(B3Propagator.class, BaggageTextMapPropagator.class);
+			Stream<Class<?>> injectors = getInjectors(propagator).stream().map(Object::getClass);
+			assertThat(injectors).containsExactly(B3Propagator.class, BaggageTextMapPropagator.class);
 		});
 	}
 
@@ -186,8 +186,8 @@ class OpenTelemetryAutoConfigurationTests {
 			.withPropertyValues("management.tracing.propagation.type=B3", "management.tracing.baggage.enabled=false")
 			.run((context) -> {
 				TextMapPropagator propagator = context.getBean(TextMapPropagator.class);
-				List<TextMapPropagator> injectors = getInjectors(propagator);
-				assertThat(injectors).extracting(TextMapPropagator::getClass).containsExactly(B3Propagator.class);
+				Stream<Class<?>> injectors = getInjectors(propagator).stream().map(Object::getClass);
+				assertThat(injectors).containsExactly(B3Propagator.class);
 			});
 	}
 
@@ -208,9 +208,8 @@ class OpenTelemetryAutoConfigurationTests {
 	void shouldSupplyW3CPropagationWithoutBaggageWhenDisabled() {
 		this.contextRunner.withPropertyValues("management.tracing.baggage.enabled=false").run((context) -> {
 			TextMapPropagator propagator = context.getBean(TextMapPropagator.class);
-			List<TextMapPropagator> injectors = getInjectors(propagator);
-			assertThat(injectors).extracting(TextMapPropagator::getClass)
-				.containsExactly(W3CTraceContextPropagator.class);
+			Stream<Class<?>> injectors = getInjectors(propagator).stream().map(Object::getClass);
+			assertThat(injectors).containsExactly(W3CTraceContextPropagator.class);
 		});
 	}