InvocationHandler documentation

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java.lang.reflect

Interface InvocationHandler

public interface InvocationHandler

InvocationHandler is the interface implemented by the invocation handler of a proxy instance.

Each proxy instance has an associated invocation handler. When a method is invoked on a proxy instance, the method invocation is encoded and dispatched to the invoke method of its invocation handler.

Since1.3

Version1.17, 07/05/05

AuthorPeter Jones

See also

Proxy

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Method Summary
Object	invoke( Object proxy, Method method, Object [] args ) Processes a method invocation on a proxy instance and returns the result.

Method Detail

invoke

public Object invoke ( Object proxy, Method method, Object [] args )

throws

Throwable

Processes a method invocation on a proxy instance and returns the result. This method will be invoked on an invocation handler when a method is invoked on a proxy instance that it is associated with.

Parameters

Type	Name	Description
Object	proxy	the proxy instance that the method was invoked on
Method	method	the `Method` instance corresponding to the interface method invoked on the proxy instance. The declaring class of the `Method` object will be the interface that the method was declared in, which may be a superinterface of the proxy interface that the proxy class inherits the method through.
Object []	args	an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, or `null` if interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such as `java.lang.Integer` or `java.lang.Boolean`.

Exceptions

Throwable the exception to throw from the method invocation on the proxy instance. The exception's type must be assignable either to any of the exception types declared in the throws clause of the interface method or to the unchecked exception types java.lang.RuntimeException or java.lang.Error. If a checked exception is thrown by this method that is not assignable to any of the exception types declared in the throws clause of the interface method, then an UndeclaredThrowableException containing the exception that was thrown by this method will be thrown by the method invocation on the proxy instance.