Class RemoteObjectInvocationHandler
java.lang.Object
java.rmi.server.RemoteObject
java.rmi.server.RemoteObjectInvocationHandler
- All Implemented Interfaces:
Serializable
,InvocationHandler
,Remote
An implementation of the
InvocationHandler
interface for
use with Java Remote Method Invocation (Java RMI). This invocation
handler can be used in conjunction with a dynamic proxy instance as a
replacement for a pregenerated stub class.
Applications are not expected to use this class directly. A remote
object exported to use a dynamic proxy with UnicastRemoteObject
has an instance of this class as that proxy's invocation handler.
- Since:
- 1.5
- See Also:
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Field Summary
Fields inherited from class java.rmi.server.RemoteObject
ref
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Constructor Summary
ConstructorDescriptionCreates a newRemoteObjectInvocationHandler
constructed with the specifiedRemoteRef
. -
Method Summary
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Constructor Details
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RemoteObjectInvocationHandler
Creates a newRemoteObjectInvocationHandler
constructed with the specifiedRemoteRef
.- Parameters:
ref
- the remote ref- Throws:
NullPointerException
- ifref
isnull
-
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Method Details
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invoke
Processes a method invocation made on the encapsulating proxy instance,proxy
, and returns the result.RemoteObjectInvocationHandler
implements this method as follows:If
method
is one of the following methods, it is processed as described below:Object.hashCode
: Returns the hash code value for the proxy.Object.equals
: Returnstrue
if the argument (args[0]
) is an instance of a dynamic proxy class and this invocation handler is equal to the invocation handler of that argument, and returnsfalse
otherwise.Object.toString
: Returns a string representation of the proxy.
If
method
overridesObject.finalize
, it is ignored.Otherwise, a remote call is made as follows:
- If
proxy
is not an instance of the interfaceRemote
, then anIllegalArgumentException
is thrown. - Otherwise, the
invoke
method is invoked on this invocation handler'sRemoteRef
, passingproxy
,method
,args
, and the method hash (defined in section 8.3 of the "Java Remote Method Invocation (RMI) Specification") formethod
, and the result is returned. - If an exception is thrown by
RemoteRef.invoke
and that exception is a checked exception that is not assignable to any exception in thethrows
clause of the method implemented by theproxy
's class, then that exception is wrapped in anUnexpectedException
and the wrapped exception is thrown. Otherwise, the exception thrown byinvoke
is thrown by this method.
The semantics of this method are unspecified if the arguments could not have been produced by an instance of some valid dynamic proxy class containing this invocation handler.
- Specified by:
invoke
in interfaceInvocationHandler
- Parameters:
proxy
- the proxy instance that the method was invoked onmethod
- theMethod
instance corresponding to the interface method invoked on the proxy instanceargs
- an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, ornull
if the method takes no arguments- Returns:
- the value to return from the method invocation on the proxy instance
- Throws:
Throwable
- the exception to throw from the method invocation on the proxy instance- See Also:
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