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- All Known Implementing Classes:
CompositeDataInvocationHandler,EventHandler,MBeanServerInvocationHandler,RemoteObjectInvocationHandler
public interface InvocationHandlerInvocationHandleris 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
invokemethod of its invocation handler.- Since:
- 1.3
- See Also:
Proxy
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description Objectinvoke(Object proxy, Method method, Object[] args)Processes a method invocation on a proxy instance and returns the result.
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Method Detail
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invoke
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:
proxy- the proxy instance that the method was invoked onmethod- theMethodinstance corresponding to the interface method invoked on the proxy instance. The declaring class of theMethodobject 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.args- an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, ornullif interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such asjava.lang.Integerorjava.lang.Boolean.- Returns:
- the value to return from the method invocation on the
proxy instance. If the declared return type of the interface
method is a primitive type, then the value returned by
this method must be an instance of the corresponding primitive
wrapper class; otherwise, it must be a type assignable to the
declared return type. If the value returned by this method is
nulland the interface method's return type is primitive, then aNullPointerExceptionwill be thrown by the method invocation on the proxy instance. If the value returned by this method is otherwise not compatible with the interface method's declared return type as described above, aClassCastExceptionwill be thrown by the method invocation on the proxy instance. - Throws:
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 thethrowsclause of the interface method or to the unchecked exception typesjava.lang.RuntimeExceptionorjava.lang.Error. If a checked exception is thrown by this method that is not assignable to any of the exception types declared in thethrowsclause of the interface method, then anUndeclaredThrowableExceptioncontaining the exception that was thrown by this method will be thrown by the method invocation on the proxy instance.- See Also:
UndeclaredThrowableException
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