Add BeanFactoryInitializer callback before preInstantiateSingletons

Closes gh-32836

spring-beans/src/main/java/org/springframework/beans/factory/BeanFactoryInitializer.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2002-2024 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
+ *
+ *      https://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.beans.factory;
+
+/**
+ * Callback interface for initializing a Spring {@link ListableBeanFactory}
+ * prior to entering the singleton pre-instantiation phase. Can be used to
+ * trigger early initialization of specific beans before regular singletons.
+ *
+ * <p>Can be programmatically applied to a {@code ListableBeanFactory} instance.
+ * In an {@code ApplicationContext}, beans of type {@code BeanFactoryInitializer}
+ * will be autodetected and automatically applied to the underlying bean factory.
+ *
+ * @author Juergen Hoeller
+ * @since 6.2
+ * @param <F> the bean factory type
+ * @see org.springframework.beans.factory.config.ConfigurableListableBeanFactory#preInstantiateSingletons()
+ */
+public interface BeanFactoryInitializer<F extends ListableBeanFactory> {
+
+	/**
+	 * Initialize the given bean factory.
+	 * @param beanFactory the bean factory to bootstrap
+	 */
+	void initialize(F beanFactory);
+
+}