Revert "Cache MethodParameter annotation lookup results"

This reverts commit c10d63dc01.

spring-core/src/main/java/org/springframework/core/MethodParameter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -26,8 +26,6 @@ import java.lang.reflect.Type;
 import java.lang.reflect.TypeVariable;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
 
 import org.springframework.util.Assert;
 
@@ -39,21 +37,11 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @author Rob Harrop
  * @author Andy Clement
- * @author Nikita Tovstoles
- * @author Chris Beams
  * @since 2.0
  * @see GenericCollectionTypeResolver
  */
 public class MethodParameter {
 
-
-	private static final Annotation[][] EMPTY_ANNOTATION_MATRIX = new Annotation[0][0];
-
-	private static final Annotation[] EMPTY_ANNOTATION_ARRAY = new Annotation[0];
-
-	static final ConcurrentMap<Method, Annotation[][]> methodParamAnnotationsCache =
-			new ConcurrentHashMap<Method, Annotation[][]>();
-
 	private final Method method;
 
 	private final Constructor constructor;
@@ -291,7 +279,7 @@ public class MethodParameter {
 	public Annotation[] getParameterAnnotations() {
 		if (this.parameterAnnotations == null) {
 			Annotation[][] annotationArray = (this.method != null ?
-					getMethodParameterAnnotations(this.method) : this.constructor.getParameterAnnotations());
+					this.method.getParameterAnnotations() : this.constructor.getParameterAnnotations());
 			if (this.parameterIndex >= 0 && this.parameterIndex < annotationArray.length) {
 				this.parameterAnnotations = annotationArray[this.parameterIndex];
 			}
@@ -450,41 +438,6 @@ public class MethodParameter {
 		}
 	}
 
-	/**
-	 * Return the parameter annotations for the given method, retrieving cached values
-	 * if a lookup has already been performed for this method, otherwise perform a fresh
-	 * lookup and populate the cache with the result before returning. <strong>For
-	 * internal use only.</strong>
-	 * @param method the method to introspect for parameter annotations
-	 */
-	static Annotation[][] getMethodParameterAnnotations(Method method) {
-		Assert.notNull(method);
-
-		Annotation[][] result = methodParamAnnotationsCache.get(method);
-		if (result == null) {
-			result = method.getParameterAnnotations();
-
-			if(result.length == 0) {
-				result = EMPTY_ANNOTATION_MATRIX;
-			}
-			else {
-				for (int i = 0; i < result.length; i++) {
-					if (result[i].length == 0) {
-						result[i] = EMPTY_ANNOTATION_ARRAY;
-					}
-				}
-			}
-			methodParamAnnotationsCache.put(method, result);
-		}
-
-		//always return deep copy to prevent caller from modifying cache state
-		Annotation[][] resultCopy = new Annotation[result.length][0];
-		for(int i = 0; i < result.length; i++) {
-			resultCopy[i] = result[i].clone();
-		}
-		return resultCopy;
-	}
-
 	@Override
 	public boolean equals(Object obj) {
 		if (this == obj) {
@@ -506,6 +459,7 @@ public class MethodParameter {
 		return false;
 	}
 
+
 	@Override
 	public int hashCode() {
 		int result = this.hash;

spring-core/src/test/java/org/springframework/core/MethodParameterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -16,11 +16,6 @@
 
 package org.springframework.core;
 
-import java.lang.annotation.Annotation;
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
 import java.lang.reflect.Method;
 
 import org.junit.Before;
@@ -30,7 +25,6 @@ import static org.junit.Assert.*;
 
 /**
  * @author Arjen Poutsma
- * @author Nikita Tovstoles
  */
 public class MethodParameterTests {
 
@@ -49,6 +43,7 @@ public class MethodParameterTests {
 	}
 
 
+	
 	@Test
 	public void testEquals() throws NoSuchMethodException {
 		assertEquals(stringParameter, stringParameter);
@@ -82,30 +77,9 @@ public class MethodParameterTests {
 		assertTrue(longParameter.hashCode() != methodParameter.hashCode());
 	}
 
-	@Test
-	public void testGetMethodParamaterAnnotations() {
-		Method method = stringParameter.getMethod();
-		Annotation[][] expectedAnnotations = method.getParameterAnnotations();
-		assertEquals(2, expectedAnnotations.length);
-		assertEquals(DummyAnnotation.class, expectedAnnotations[0][0].annotationType());
 
-		//start with empty cache
+	public int method(String p1, long p2) {
-		MethodParameter.methodParamAnnotationsCache.clear();
-
-		//check correctness
-		assertArrayEquals(expectedAnnotations, MethodParameter.getMethodParameterAnnotations(method));
-		//check that return value's been cached
-		assertArrayEquals(expectedAnnotations, MethodParameter.methodParamAnnotationsCache.get(method));
-	}
-
-
-	public int method(@DummyAnnotation String p1, long p2) {
 		return 42;
 	}
 
-	@Target(ElementType.PARAMETER)
-	@Retention(RetentionPolicy.RUNTIME)
-	public @interface DummyAnnotation {
-
-	}
 }