Package 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()

    • 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()