Allow for shared Objenesis caching in ObjenesisCglibAopProxy

Issue: SPR-12755

spring-core/src/main/java/org/springframework/objenesis/SpringObjenesis.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2002-2015 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.objenesis;
+
+import org.springframework.objenesis.instantiator.ObjectInstantiator;
+import org.springframework.objenesis.strategy.InstantiatorStrategy;
+import org.springframework.objenesis.strategy.StdInstantiatorStrategy;
+import org.springframework.util.ConcurrentReferenceHashMap;
+
+/**
+ * Spring-specific variant of {@link ObjenesisStd} / {@link ObjenesisBase},
+ * providing a cache based on {@code Class} keys instead of class names.
+ *
+ * @author Juergen Hoeller
+ * @since 4.2
+ */
+public class SpringObjenesis implements Objenesis {
+
+	private final InstantiatorStrategy strategy = new StdInstantiatorStrategy();
+
+	private final ConcurrentReferenceHashMap<Class<?>, ObjectInstantiator<?>> cache =
+			new ConcurrentReferenceHashMap<Class<?>, ObjectInstantiator<?>>();
+
+
+	public <T> T newInstance(Class<T> clazz) {
+		return getInstantiatorOf(clazz).newInstance();
+	}
+
+	@SuppressWarnings("unchecked")
+	public <T> ObjectInstantiator<T> getInstantiatorOf(Class<T> clazz) {
+		ObjectInstantiator<?> instantiator = this.cache.get(clazz);
+		if (instantiator == null) {
+			ObjectInstantiator<?> newInstantiator = this.strategy.newInstantiatorOf(clazz);
+			instantiator = this.cache.putIfAbsent(clazz, newInstantiator);
+			if (instantiator == null) {
+				instantiator = newInstantiator;
+			}
+		}
+		return (ObjectInstantiator<T>) instantiator;
+	}
+
+}

spring-core/src/main/java/org/springframework/objenesis/package-info.java

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+/**
+ * Spring's repackaging of
+ * <a href="http://objenesis.org">Objenesis 2.1</a>
+ * (for internal use only).
+ *
+ * <p>This repackaging technique avoids any potential conflicts with
+ * dependencies on different Objenesis versions at the application
+ * level or from third-party libraries and frameworks.
+ *
+ * <p>As this repackaging happens at the class file level, sources
+ * and javadocs are not available here. See the original
+ * <a href="http://objenesis.org/tutorial.html">Objenesis docs</a>
+ * for details when working with these classes.
+ */
+package org.springframework.objenesis;