org.springframework.beans.factory

Interface SmartFactoryBean<T>

Type Parameters:

T - the bean type

All Superinterfaces:

FactoryBean<T>

public interface SmartFactoryBean<T>
extends FactoryBean<T>

Extension of the FactoryBean interface. Implementations may indicate whether they always return independent instances, for the case where their FactoryBean.isSingleton() implementation returning false does not clearly indicate independent instances.

Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if their FactoryBean.isSingleton() implementation returns false; the exposed object is only accessed on demand.

NOTE: This interface is a special purpose interface, mainly for internal use within the framework and within collaborating frameworks. In general, application-provided FactoryBeans should simply implement the plain FactoryBean interface. New methods might be added to this extended interface even in point releases.

Since:

2.0.3

Author:

Juergen Hoeller

See Also:

isPrototype(), FactoryBean.isSingleton()

Field Summary

Fields inherited from interface org.springframework.beans.factory.FactoryBean

OBJECT_TYPE_ATTRIBUTE

Method Summary

Modifier and Type	Method and Description
default boolean	isEagerInit() Does this FactoryBean expect eager initialization, that is, eagerly initialize itself as well as expect eager initialization of its singleton object (if any)?
default boolean	isPrototype() Is the object managed by this factory a prototype? That is, will FactoryBean.getObject() always return an independent instance?

Methods inherited from interface org.springframework.beans.factory.FactoryBean

getObject, getObjectType, isSingleton

Method Detail

isPrototype

default boolean isPrototype()

Is the object managed by this factory a prototype? That is, will FactoryBean.getObject() always return an independent instance?

The prototype status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

This method is supposed to strictly check for independent instances; it should not return true for scoped objects or other kinds of non-singleton, non-independent objects. For this reason, this is not simply the inverted form of FactoryBean.isSingleton().

The default implementation returns false.

Returns:

whether the exposed object is a prototype

See Also:

FactoryBean.getObject(), FactoryBean.isSingleton()

isEagerInit

default boolean isEagerInit()

Does this FactoryBean expect eager initialization, that is, eagerly initialize itself as well as expect eager initialization of its singleton object (if any)?

A standard FactoryBean is not expected to initialize eagerly: Its FactoryBean.getObject() will only be called for actual access, even in case of a singleton object. Returning true from this method suggests that FactoryBean.getObject() should be called eagerly, also applying post-processors eagerly. This may make sense in case of a singleton object, in particular if post-processors expect to be applied on startup.

The default implementation returns false.

Returns:

whether eager initialization applies

See Also:

ConfigurableListableBeanFactory.preInstantiateSingletons()