org.springframework.beans.factory.support.InstantiationStrategy Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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.support;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.lang.Nullable;
/**
* Interface responsible for creating instances corresponding to a root bean definition.
*
* This is pulled out into a strategy as various approaches are possible,
* including using CGLIB to create subclasses on the fly to support Method Injection.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 1.1
*/
public interface InstantiationStrategy {
/**
* Return an instance of the bean with the given name in this factory.
* @param bd the bean definition
* @param beanName the name of the bean when it is created in this context.
* The name can be {@code null} if we are autowiring a bean which doesn't
* belong to the factory.
* @param owner the owning BeanFactory
* @return a bean instance for this bean definition
* @throws BeansException if the instantiation attempt failed
*/
Object instantiate(RootBeanDefinition bd, @Nullable String beanName, BeanFactory owner)
throws BeansException;
/**
* Return an instance of the bean with the given name in this factory,
* creating it via the given constructor.
* @param bd the bean definition
* @param beanName the name of the bean when it is created in this context.
* The name can be {@code null} if we are autowiring a bean which doesn't
* belong to the factory.
* @param owner the owning BeanFactory
* @param ctor the constructor to use
* @param args the constructor arguments to apply
* @return a bean instance for this bean definition
* @throws BeansException if the instantiation attempt failed
*/
Object instantiate(RootBeanDefinition bd, @Nullable String beanName, BeanFactory owner,
Constructor ctor, Object... args) throws BeansException;
/**
* Return an instance of the bean with the given name in this factory,
* creating it via the given factory method.
* @param bd the bean definition
* @param beanName the name of the bean when it is created in this context.
* The name can be {@code null} if we are autowiring a bean which doesn't
* belong to the factory.
* @param owner the owning BeanFactory
* @param factoryBean the factory bean instance to call the factory method on,
* or {@code null} in case of a static factory method
* @param factoryMethod the factory method to use
* @param args the factory method arguments to apply
* @return a bean instance for this bean definition
* @throws BeansException if the instantiation attempt failed
*/
Object instantiate(RootBeanDefinition bd, @Nullable String beanName, BeanFactory owner,
@Nullable Object factoryBean, Method factoryMethod, Object... args)
throws BeansException;
}