Package org.springframework.aop.framework

Class ReflectiveMethodInvocation

java.lang.Object
org.springframework.aop.framework.ReflectiveMethodInvocation
All Implemented Interfaces:
Cloneable, Invocation, Joinpoint, MethodInvocation, ProxyMethodInvocation
public class ReflectiveMethodInvocation extends Object implements ProxyMethodInvocation, Cloneable
Spring's implementation of the AOP Alliance MethodInvocation interface, implementing the extended ProxyMethodInvocation interface.

Invokes the target object using reflection. Subclasses can override the invokeJoinpoint() method to change this behavior, so this is also a useful base class for more specialized MethodInvocation implementations.

It is possible to clone an invocation, to invoke proceed() repeatedly (once per clone), using the invocableClone() method. It is also possible to attach custom attributes to the invocation, using the setUserAttribute(java.lang.String, java.lang.Object) / getUserAttribute(java.lang.String) methods.

NOTE: This class is considered internal and should not be directly accessed. The sole reason for it being public is compatibility with existing framework integrations (e.g. Pitchfork). For any other purposes, use the ProxyMethodInvocation interface instead.

Author:
Rod Johnson, Juergen Hoeller, Adrian Colyer
See Also:

  • Field Details

    • proxy

      protected final Object proxy

    • target

      @Nullable protected final Object target

    • method

      protected final Method method

    • arguments

      protected Object[] arguments

    • interceptorsAndDynamicMethodMatchers

      protected final List<?> interceptorsAndDynamicMethodMatchers
      List of MethodInterceptor and InterceptorAndDynamicMethodMatcher that need dynamic checks.

  • Constructor Details

    • ReflectiveMethodInvocation

      protected ReflectiveMethodInvocation(Object proxy, @Nullable Object target, Method method, @Nullable Object[] arguments, @Nullable Class<?> targetClass, List<Object> interceptorsAndDynamicMethodMatchers)
      Construct a new ReflectiveMethodInvocation with the given arguments.
      Parameters:
      proxy - the proxy object that the invocation was made on
      target - the target object to invoke
      method - the method to invoke
      arguments - the arguments to invoke the method with
      targetClass - the target class, for MethodMatcher invocations
      interceptorsAndDynamicMethodMatchers - interceptors that should be applied, along with any InterceptorAndDynamicMethodMatchers that need evaluation at runtime. MethodMatchers included in this struct must already have been found to have matched as far as was possibly statically. Passing an array might be about 10% faster, but would complicate the code. And it would work only for static pointcuts.

  • Method Details

    • getProxy

      public final Object getProxy()
      Description copied from interface: ProxyMethodInvocation
      Return the proxy that this method invocation was made through.
      Specified by:
      getProxy in interface ProxyMethodInvocation
      Returns:
      the original proxy object

    • getThis

      @Nullable public final Object getThis()
      Description copied from interface: Joinpoint
      Return the object that holds the current joinpoint's static part.

      For instance, the target object for an invocation.

      Specified by:
      getThis in interface Joinpoint
      Returns:
      the object (can be null if the accessible object is static)

    • getStaticPart

      public final AccessibleObject getStaticPart()
      Description copied from interface: Joinpoint
      Return the static part of this joinpoint.

      The static part is an accessible object on which a chain of interceptors are installed.

      Specified by:
      getStaticPart in interface Joinpoint

    • getMethod

      public final Method getMethod()
      Return the method invoked on the proxied interface. May or may not correspond with a method invoked on an underlying implementation of that interface.
      Specified by:
      getMethod in interface MethodInvocation
      Returns:
      the method being called

    • getArguments

      public final Object[] getArguments()
      Description copied from interface: Invocation
      Get the arguments as an array object. It is possible to change element values within this array to change the arguments.
      Specified by:
      getArguments in interface Invocation
      Returns:
      the argument of the invocation

    • setArguments

      public void setArguments(Object... arguments)
      Description copied from interface: ProxyMethodInvocation
      Set the arguments to be used on subsequent invocations in the any advice in this chain.
      Specified by:
      setArguments in interface ProxyMethodInvocation
      Parameters:
      arguments - the argument array

    • proceed

      @Nullable public Object proceed() throws Throwable
      Description copied from interface: Joinpoint
      Proceed to the next interceptor in the chain.

      The implementation and the semantics of this method depends on the actual joinpoint type (see the children interfaces).

      Specified by:
      proceed in interface Joinpoint
      Returns:
      see the children interfaces' proceed definition
      Throws:
      Throwable - if the joinpoint throws an exception

    • invokeJoinpoint

      @Nullable protected Object invokeJoinpoint() throws Throwable
      Invoke the joinpoint using reflection. Subclasses can override this to use custom invocation.
      Returns:
      the return value of the joinpoint
      Throws:
      Throwable - if invoking the joinpoint resulted in an exception

    • invocableClone

      public MethodInvocation invocableClone()
      This implementation returns a shallow copy of this invocation object, including an independent copy of the original arguments array.

      We want a shallow copy in this case: We want to use the same interceptor chain and other object references, but we want an independent value for the current interceptor index.

      Specified by:
      invocableClone in interface ProxyMethodInvocation
      Returns:
      an invocable clone of this invocation. proceed() can be called once per clone.
      See Also:

    • invocableClone

      public MethodInvocation invocableClone(Object... arguments)
      This implementation returns a shallow copy of this invocation object, using the given arguments array for the clone.

      We want a shallow copy in this case: We want to use the same interceptor chain and other object references, but we want an independent value for the current interceptor index.

      Specified by:
      invocableClone in interface ProxyMethodInvocation
      Parameters:
      arguments - the arguments that the cloned invocation is supposed to use, overriding the original arguments
      Returns:
      an invocable clone of this invocation. proceed() can be called once per clone.
      See Also:

    • setUserAttribute

      public void setUserAttribute(String key, @Nullable Object value)
      Description copied from interface: ProxyMethodInvocation
      Add the specified user attribute with the given value to this invocation.

      Such attributes are not used within the AOP framework itself. They are just kept as part of the invocation object, for use in special interceptors.

      Specified by:
      setUserAttribute in interface ProxyMethodInvocation
      Parameters:
      key - the name of the attribute
      value - the value of the attribute, or null to reset it

    • getUserAttribute

      @Nullable public Object getUserAttribute(String key)
      Description copied from interface: ProxyMethodInvocation
      Return the value of the specified user attribute.
      Specified by:
      getUserAttribute in interface ProxyMethodInvocation
      Parameters:
      key - the name of the attribute
      Returns:
      the value of the attribute, or null if not set
      See Also:

    • getUserAttributes

      public Map<String,Object> getUserAttributes()
      Return user attributes associated with this invocation. This method provides an invocation-bound alternative to a ThreadLocal.

      This map is initialized lazily and is not used in the AOP framework itself.

      Returns:
      any user attributes associated with this invocation (never null)

    • toString

      public String toString()
      Overrides:
      toString in class Object