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, @Nullable String beanName, BeanFactory owner)	Determine the actual class for the given bean definition, as instantiated at runtime.
Object	instantiate(RootBeanDefinition bd, @Nullable String beanName, BeanFactory owner)	Return an instance of the bean with the given name in this factory.
Object	instantiate(RootBeanDefinition bd, @Nullable String beanName, BeanFactory owner, @Nullable Object factoryBean, Method factoryMethod, @Nullable 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, @Nullable 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,
 @Nullable 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