Package org.springframework.beans.factory.support

Interface InstantiationStrategy

All Known Implementing Classes:

CglibSubclassingInstantiationStrategy, SimpleInstantiationStrategy

public interface InstantiationStrategy

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.

Since:

1.1

Author:

Rod Johnson, Juergen Hoeller

Method Summary

Modifier and Type	Method	Description
default Class<?>	getActualBeanClass(RootBeanDefinition bd, String beanName, BeanFactory owner)	Determine the actual class for the given bean definition, as instantiated at runtime.
Object	instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner)	Return an instance of the bean with the given name in this factory.
Object	instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner, Object factoryBean, Method factoryMethod, Object... args)	Return an instance of the bean with the given name in this factory, creating it via the given factory method.
Object	instantiate(RootBeanDefinition bd, String beanName, BeanFactory owner, Constructor<?> ctor, Object... args)	Return an instance of the bean with the given name in this factory, creating it via the given constructor.

Method Details

instantiate

Object instantiate(RootBeanDefinition bd,
 @Nullable
 String beanName,
 BeanFactory owner)
            throws BeansException

Return an instance of the bean with the given name in this factory.

Parameters:

bd - the bean definition

beanName - the name of the bean when it is created in this context. The name can be null if we are autowiring a bean which doesn't belong to the factory.

owner - the owning BeanFactory

Returns:

a bean instance for this bean definition

Throws:

BeansException - if the instantiation attempt failed

instantiate

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 constructor.

Parameters:

bd - the bean definition

beanName - the name of the bean when it is created in this context. The name can be null if we are autowiring a bean which doesn't belong to the factory.

owner - the owning BeanFactory

ctor - the constructor to use

args - the constructor arguments to apply

Returns:

a bean instance for this bean definition

Throws:

BeansException - if the instantiation attempt failed

instantiate

Object instantiate(RootBeanDefinition bd,
 @Nullable
 String beanName,
 BeanFactory owner,
 @Nullable
 Object factoryBean,
 Method factoryMethod,
 Object... args)
            throws BeansException

Return an instance of the bean with the given name in this factory, creating it via the given factory method.

Parameters:

bd - the bean definition

beanName - the name of the bean when it is created in this context. The name can be null if we are autowiring a bean which doesn't belong to the factory.

owner - the owning BeanFactory

factoryBean - the factory bean instance to call the factory method on, or null in case of a static factory method

factoryMethod - the factory method to use

args - the factory method arguments to apply

Returns:

a bean instance for this bean definition

Throws:

BeansException - if the instantiation attempt failed

getActualBeanClass

default Class<?> getActualBeanClass(RootBeanDefinition bd,
 @Nullable
 String beanName,
 BeanFactory owner)

Determine the actual class for the given bean definition, as instantiated at runtime.

Since:

6.0