spring-framework / org.springframework.beans.factory / SmartFactoryBean

SmartFactoryBean

interface SmartFactoryBean<T : Any> : FactoryBean<T>

Extension of the FactoryBean interface. Implementations may indicate whether they always return independent instances, for the case where their #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 #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.

Author
Juergen Hoeller

Since
2.0.3

See Also
#isPrototype()#isSingleton()

Functions

isEagerInit

 open fun isEagerInit(): Boolean

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 #getObject() will only be called for actual access, even in case of a singleton object. Returning true from this method suggests that #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.

isPrototype

 open fun isPrototype(): Boolean

Is the object managed by this factory a prototype? That is, will #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 #isSingleton().

The default implementation returns false.