Polish "Add ServerWebExchange a new attribute for PathContainer to avoid repeating parsePath in PathRoutePredicateFactory."

See gh-2884

spring-cloud-gateway-server/pom.xml

@@ -174,12 +174,13 @@
 			<groupId>org.openjdk.jmh</groupId>
 			<artifactId>jmh-core</artifactId>
 			<version>1.20</version>
+			<scope>test</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.openjdk.jmh</groupId>
 			<artifactId>jmh-generator-annprocess</artifactId>
 			<version>1.20</version>
-			<scope>provided</scope>
+			<scope>test</scope>
 		</dependency>
 	</dependencies>
 	<build>

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/handler/predicate/PathRoutePredicateFactory.java

@@ -90,12 +90,9 @@ public class PathRoutePredicateFactory extends AbstractRoutePredicateFactory<Pat
 		return new GatewayPredicate() {
 			@Override
 			public boolean test(ServerWebExchange exchange) {
-				PathContainer path = (PathContainer) exchange.getAttributes()
-						.get(GATEWAY_PREDICATE_PATH_CONTAINER_ATTR);
-				if (path == null) {
-					path = parsePath(exchange.getRequest().getURI().getRawPath());
-					exchange.getAttributes().put(GATEWAY_PREDICATE_PATH_CONTAINER_ATTR, path);
-				}
+				PathContainer path = (PathContainer) exchange.getAttributes().computeIfAbsent(
+						GATEWAY_PREDICATE_PATH_CONTAINER_ATTR,
+						s -> parsePath(exchange.getRequest().getURI().getRawPath()));
 
 				PathPattern match = null;
 				for (int i = 0; i < pathPatterns.size(); i++) {

spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/handler/predicate/PathRoutePredicatePathContainerAttrBenchMarkTests.java

@@ -75,4 +75,8 @@ public class PathRoutePredicatePathContainerAttrBenchMarkTests {
 		}
 	}
 
+	public static void main(String[] args) throws Exception {
+		org.openjdk.jmh.Main.main(args);
+	}
+
 }