org.springframework.aop.aspectj

## Class SingletonAspectInstanceFactory

- java.lang.Object
- - org.springframework.aop.aspectj.SingletonAspectInstanceFactory

- All Implemented Interfaces:
    Serializable, AspectInstanceFactory, Ordered
  Direct Known Subclasses:
    SingletonMetadataAwareAspectInstanceFactory

      public class SingletonAspectInstanceFactory
      extends Object
      implements AspectInstanceFactory, Serializable

  Implementation of `AspectInstanceFactory` that is backed by a specified singleton object, returning the same instance for every `getAspectInstance()` call.
  Since:
    2.0
  Author:
    Rod Johnson, Juergen Hoeller
  See Also:
    `SimpleAspectInstanceFactory`, Serialized Form

- - ### Field Summary

    - ### Fields inherited from interface org.springframework.core.Ordered

      `HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SingletonAspectInstanceFactory(Object aspectInstance)` Create a new SingletonAspectInstanceFactory for the given aspect instance.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `ClassLoader` | `getAspectClassLoader()` Expose the aspect class loader that this factory uses.
    `Object` | `getAspectInstance()` Create an instance of this factory's aspect.
    `int` | `getOrder()` Determine the order for this factory's aspect instance, either an instance-specific order expressed through implementing the `Ordered` interface, or a fallback order.
    `protected int` | `getOrderForAspectClass(Class<?> aspectClass)` Determine a fallback order for the case that the aspect instance does not express an instance-specific order through implementing the `Ordered` interface.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### SingletonAspectInstanceFactory

          public SingletonAspectInstanceFactory(Object aspectInstance)

      Create a new SingletonAspectInstanceFactory for the given aspect instance.
      Parameters:
        `aspectInstance` - the singleton aspect instance

  - ### Method Detail

    - #### getAspectInstance

          public final Object getAspectInstance()

      Description copied from interface: `AspectInstanceFactory`
      Create an instance of this factory's aspect.
      Specified by:
        `getAspectInstance` in interface `AspectInstanceFactory`
      Returns:
        the aspect instance (never `null`)

    - #### getAspectClassLoader

          @Nullable
          public ClassLoader getAspectClassLoader()

      Description copied from interface: `AspectInstanceFactory`
      Expose the aspect class loader that this factory uses.
      Specified by:
        `getAspectClassLoader` in interface `AspectInstanceFactory`
      Returns:
        the aspect class loader (or `null` for the bootstrap loader)
      See Also:
        `ClassUtils.getDefaultClassLoader()`

    - #### getOrder

          public int getOrder()

      Determine the order for this factory's aspect instance, either an instance-specific order expressed through implementing the `Ordered` interface, or a fallback order.
      Specified by:
        `getOrder` in interface `Ordered`
      Returns:
        the order value
      See Also:
        `Ordered`, `getOrderForAspectClass(java.lang.Class<?>)`

    - #### getOrderForAspectClass

          protected int getOrderForAspectClass(Class<?> aspectClass)

      Determine a fallback order for the case that the aspect instance does not express an instance-specific order through implementing the `Ordered` interface.

      The default implementation simply returns `Ordered.LOWEST_PRECEDENCE`.

      Parameters:
        `aspectClass` - the aspect class