Performance improvements in `ReactiveWrappers` and `ConvertingPropertyAccessor`.

We now cache whether types are reactive wrappers and bypass the ConversionService for assignable primitive values.

Closes #2546

src/main/java/org/springframework/data/mapping/model/ConvertingPropertyAccessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2021 the original author or authors.
+ * Copyright 2014-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import org.springframework.data.mapping.PersistentPropertyAccessor;
 import org.springframework.data.mapping.PersistentPropertyPath;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 
 /**
  * {@link PersistentPropertyAccessor} that potentially converts the value handed to
@@ -103,7 +104,7 @@ public class ConvertingPropertyAccessor<T> extends SimplePersistentPropertyPathA
 
 		return (S) (source == null //
 				? null //
-				: type.isAssignableFrom(source.getClass()) //
+				: ClassUtils.resolvePrimitiveIfNecessary(type).isAssignableFrom(source.getClass()) //
 						? source //
 						: conversionService.convert(source, type));
 	}

src/main/java/org/springframework/data/repository/util/ReactiveWrappers.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2021 the original author or authors.
+ * Copyright 2016-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,9 @@ import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
 import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
 import java.util.Optional;
 
 import org.springframework.core.ReactiveTypeDescriptor;
@@ -26,6 +29,7 @@ import org.springframework.data.util.ProxyUtils;
 import org.springframework.data.util.ReflectionUtils;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.ConcurrentReferenceHashMap;
 
 /**
  * Utility class to expose details about reactive wrapper types. This class exposes whether a reactive wrapper is
@@ -65,6 +69,11 @@ public abstract class ReactiveWrappers {
 	private static final boolean MUTINY_PRESENT = ClassUtils.isPresent("io.smallrye.mutiny.Multi",
 			ReactiveWrappers.class.getClassLoader());
 
+	private static final Map<Class<?>, Boolean> IS_REACTIVE_TYPE = new ConcurrentReferenceHashMap<>();
+
+	private static final boolean IS_REACTIVE_AVAILABLE = Arrays.stream(ReactiveLibrary.values())
+			.anyMatch(ReactiveWrappers::isAvailable);
+
 	private ReactiveWrappers() {}
 
 	/**
@@ -84,7 +93,7 @@ public abstract class ReactiveWrappers {
 	 * @return {@literal true} if reactive support is available.
 	 */
 	public static boolean isAvailable() {
-		return Arrays.stream(ReactiveLibrary.values()).anyMatch(ReactiveWrappers::isAvailable);
+		return IS_REACTIVE_AVAILABLE;
 	}
 
 	/**
@@ -118,7 +127,7 @@ public abstract class ReactiveWrappers {
 	 * @return {@literal true} if the {@code type} is a supported reactive wrapper type.
 	 */
 	public static boolean supports(Class<?> type) {
-		return isAvailable() && isWrapper(ProxyUtils.getUserClass(type));
+		return isAvailable() && IS_REACTIVE_TYPE.computeIfAbsent(type, key -> isWrapper(ProxyUtils.getUserClass(key)));
 	}
 
 	/**