org.springframework.beans.factory

## Interface SmartFactoryBean<T>

- All Superinterfaces:
    FactoryBean<T>
  All Known Implementing Classes:
    BeanReferenceFactoryBean

      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 Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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)?
    `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

          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()`.

      Returns:
        whether the exposed object is a prototype
      See Also:
        `FactoryBean.getObject()`, `FactoryBean.isSingleton()`

    - #### isEagerInit

          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.

      Returns:
        whether eager initialization applies
      See Also:
        `ConfigurableListableBeanFactory.preInstantiateSingletons()`