Interface SmartFactoryBean<T>
- Type Parameters:
T
- the bean type
- All Superinterfaces:
FactoryBean<T>
public interface SmartFactoryBean<T> extends FactoryBean<T>
Extension of theFactoryBean
interface. Implementations may indicate whether they always return independent instances, for the case where theirFactoryBean.isSingleton()
implementation returningfalse
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 theirFactoryBean.isSingleton()
implementation returnsfalse
; 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
All Methods Instance Methods Default Methods Modifier and Type Method 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, willFactoryBean.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, willFactoryBean.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 ofFactoryBean.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. Returningtrue
from this method suggests thatFactoryBean.getObject()
should be called eagerly, also applying post-processors eagerly. This may make sense in case of asingleton
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()