001/* 002 * Copyright 2002-2014 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.factory.support; 018 019import java.lang.reflect.Constructor; 020import java.lang.reflect.Method; 021 022import org.springframework.beans.BeansException; 023import org.springframework.beans.factory.BeanFactory; 024 025/** 026 * Interface responsible for creating instances corresponding to a root bean definition. 027 * 028 * <p>This is pulled out into a strategy as various approaches are possible, 029 * including using CGLIB to create subclasses on the fly to support Method Injection. 030 * 031 * @author Rod Johnson 032 * @author Juergen Hoeller 033 * @since 1.1 034 */ 035public interface InstantiationStrategy { 036 037 /** 038 * Return an instance of the bean with the given name in this factory. 039 * @param bd the bean definition 040 * @param beanName the name of the bean when it's created in this context. 041 * The name can be {@code null} if we're autowiring a bean which doesn't 042 * belong to the factory. 043 * @param owner the owning BeanFactory 044 * @return a bean instance for this bean definition 045 * @throws BeansException if the instantiation attempt failed 046 */ 047 Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner) 048 throws BeansException; 049 050 /** 051 * Return an instance of the bean with the given name in this factory, 052 * creating it via the given constructor. 053 * @param bd the bean definition 054 * @param beanName the name of the bean when it's created in this context. 055 * The name can be {@code null} if we're autowiring a bean which doesn't 056 * belong to the factory. 057 * @param owner the owning BeanFactory 058 * @param ctor the constructor to use 059 * @param args the constructor arguments to apply 060 * @return a bean instance for this bean definition 061 * @throws BeansException if the instantiation attempt failed 062 */ 063 Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner, 064 Constructor<?> ctor, Object... args) throws BeansException; 065 066 /** 067 * Return an instance of the bean with the given name in this factory, 068 * creating it via the given factory method. 069 * @param bd the bean definition 070 * @param beanName the name of the bean when it's created in this context. 071 * The name can be {@code null} if we're autowiring a bean which doesn't 072 * belong to the factory. 073 * @param owner the owning BeanFactory 074 * @param factoryBean the factory bean instance to call the factory method on, 075 * or {@code null} in case of a static factory method 076 * @param factoryMethod the factory method to use 077 * @param args the factory method arguments to apply 078 * @return a bean instance for this bean definition 079 * @throws BeansException if the instantiation attempt failed 080 */ 081 Object instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner, 082 Object factoryBean, Method factoryMethod, Object... args) throws BeansException; 083 084}