Support timeout property for GraphQL over SSE

See gh-42966

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/GraphQlProperties.java

@@ -43,6 +43,8 @@ public class GraphQlProperties {
 
 	private final Rsocket rsocket = new Rsocket();
 
+	private final Sse sse = new Sse();
+
 	public Graphiql getGraphiql() {
 		return this.graphiql;
 	}
@@ -67,6 +69,10 @@ public class GraphQlProperties {
 		return this.rsocket;
 	}
 
+	public Sse getSse() {
+		return this.sse;
+	}
+
 	public static class Schema {
 
 		/**
@@ -265,4 +271,21 @@ public class GraphQlProperties {
 
 	}
 
+	public static class Sse {
+
+		/**
+		 * Time required for concurrent handling to complete.
+		 */
+		private Duration timeout;
+
+		public Duration getTimeout() {
+			return this.timeout;
+		}
+
+		public void setTimeout(Duration timeout) {
+			this.timeout = timeout;
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/servlet/GraphQlWebMvcAutoConfiguration.java

@@ -37,6 +37,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.graphql.GraphQlAutoConfiguration;
 import org.springframework.boot.autoconfigure.graphql.GraphQlCorsProperties;
 import org.springframework.boot.autoconfigure.graphql.GraphQlProperties;
+import org.springframework.boot.autoconfigure.graphql.GraphQlProperties.Sse;
 import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
@@ -97,8 +98,9 @@ public class GraphQlWebMvcAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public GraphQlSseHandler graphQlSseHandler(WebGraphQlHandler webGraphQlHandler) {
-		return new GraphQlSseHandler(webGraphQlHandler);
+	public GraphQlSseHandler graphQlSseHandler(WebGraphQlHandler webGraphQlHandler, GraphQlProperties properties) {
+		Sse sse = properties.getSse();
+		return new GraphQlSseHandler(webGraphQlHandler, sse.getTimeout());
 	}
 
 	@Bean

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/graphql/servlet/GraphQlWebMvcAutoConfigurationTests.java

@@ -41,6 +41,7 @@ import org.springframework.graphql.execution.RuntimeWiringConfigurer;
 import org.springframework.graphql.server.WebGraphQlHandler;
 import org.springframework.graphql.server.WebGraphQlInterceptor;
 import org.springframework.graphql.server.webmvc.GraphQlHttpHandler;
+import org.springframework.graphql.server.webmvc.GraphQlSseHandler;
 import org.springframework.graphql.server.webmvc.GraphQlWebSocketHandler;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
@@ -78,6 +79,15 @@ class GraphQlWebMvcAutoConfigurationTests {
 			.doesNotHaveBean(GraphQlWebSocketHandler.class));
 	}
 
+	@Test
+	void shouldConfigureSseTimeout() {
+		this.contextRunner.withPropertyValues("spring.graphql.sse.timeout=10s").run((context) -> {
+			assertThat(context).hasSingleBean(GraphQlSseHandler.class);
+			GraphQlSseHandler handler = context.getBean(GraphQlSseHandler.class);
+			assertThat(handler).hasFieldOrPropertyWithValue("timeout", Duration.ofSeconds(10));
+		});
+	}
+
 	@Test
 	void simpleQueryShouldWork() {
 		withMockMvc((mvc) -> {