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GH-609 Fix support for missmatched Publishers

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Given that s-c-f-web always sends input as Flux, it creates issues for Function<Mono, Mono>, so this fixes it
Resolves #609
This commit is contained in:
Oleg Zhurakousky
2020-11-20 12:13:52 +01:00
parent 2e119a3dd6
commit 9d1d74cc76
2 changed files with 18 additions and 0 deletions
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6
spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/catalog/SimpleFunctionRegistry.java
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@@ -1088,6 +1088,12 @@ public class SimpleFunctionRegistry implements FunctionRegistry, FunctionInspect
*/
@SuppressWarnings("unchecked")
private Object convertInputPublisherIfNecessary(Publisher publisher, Type type) {
if (FunctionTypeUtils.isMono(type) && publisher instanceof Flux) {
publisher = Mono.from(publisher);
}
else if (FunctionTypeUtils.isFlux(type) && publisher instanceof Mono) {
publisher = Flux.from(publisher);
}
Type actualType = type != null ? FunctionTypeUtils.getGenericType(type) : type;
return publisher instanceof Mono
? Mono.from(publisher).map(v -> this.convertInputIfNecessary(v, actualType))

12
spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/catalog/BeanFactoryAwareFunctionRegistryTests.java
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@@ -33,6 +33,7 @@ import java.util.stream.Collectors;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.util.function.Tuple2;
@@ -530,6 +531,17 @@ public class BeanFactoryAwareFunctionRegistryTests {
assertThat(((Person) config.consumerInputRef.get()).getName()).isEqualTo("Ricky");
}
@Test
public void testGH_609() {
FunctionCatalog catalog = this.configureCatalog(SampleFunctionConfiguration.class);
Function<Publisher<String>, Publisher<String>> f = catalog.lookup("monoToMono");
Mono<String> result = (Mono<String>) f.apply(Mono.just("hello"));
assertThat(result.block()).isEqualTo("hello");
result = (Mono<String>) f.apply(Flux.just("hello"));
assertThat(result.block()).isEqualTo("hello");
}
@EnableAutoConfiguration
public static class PojoToMessageFunctionCompositionConfiguration {