## org.springframework.aop.interceptor
Class ExposeInvocationInterceptor

    java.lang.Object
      org.springframework.aop.interceptor.ExposeInvocationInterceptor

All Implemented Interfaces:
  Serializable, Advice, Interceptor, MethodInterceptor, Ordered

    public class ExposeInvocationInterceptor

extends Object
implements MethodInterceptor, Ordered, Serializable

Interceptor that exposes the current `MethodInvocation` as a thread-local object. We occasionally need to do this; for example, when a pointcut (e.g. an AspectJ expression pointcut) needs to know the full invocation context.

Don't use this interceptor unless this is really necessary. Target objects should not normally know about Spring AOP, as this creates a dependency on Spring API. Target objects should be plain POJOs as far as possible.

If used, this interceptor will normally be the first in the interceptor chain.

Author:
  Rod Johnson, Juergen Hoeller
See Also:
  Serialized Form

Field Summary
`static Advisor` `ADVISOR` Singleton advisor for this class.
`static ExposeInvocationInterceptor` `INSTANCE` Singleton instance of this class

Fields inherited from interface org.springframework.core.Ordered
`HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE`

Method Summary
`static MethodInvocation` `currentInvocation()` Return the AOP Alliance MethodInvocation object associated with the current invocation.
`int` `getOrder()` Return the order value of this object, with a higher value meaning greater in terms of sorting.
`Object` `invoke(MethodInvocation mi)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### INSTANCE

    public static final ExposeInvocationInterceptor INSTANCE

  Singleton instance of this class

### ADVISOR

    public static final Advisor ADVISOR

  Singleton advisor for this class. Use in preference to INSTANCE when using Spring AOP, as it prevents the need to create a new Advisor to wrap the instance.

Method Detail

### currentInvocation

    public static MethodInvocation currentInvocation()
                                              throws IllegalStateException

  Return the AOP Alliance MethodInvocation object associated with the current invocation.

  Returns:
    the invocation object associated with the current invocation
  Throws:
    `IllegalStateException` - if there is no AOP invocation in progress, or if the ExposeInvocationInterceptor was not added to this interceptor chain

### invoke

    public Object invoke(MethodInvocation mi)
                  throws Throwable

  Specified by:
    `invoke` in interface `MethodInterceptor`
  Throws:
    `Throwable`

### getOrder

    public int getOrder()

  Description copied from interface: `Ordered`
  Return the order value of this object, with a higher value meaning greater in terms of sorting.

  Normally starting with 0, with `Integer.MAX_VALUE` indicating the greatest value. Same order values will result in arbitrary positions for the affected objects.

  Higher values can be interpreted as lower priority. As a consequence, the object with the lowest value has highest priority (somewhat analogous to Servlet "load-on-startup" values).

  Specified by:
    `getOrder` in interface `Ordered`
  Returns:
    the order value