java.rmi.server
Interface RemoteRef

All Superinterfaces:

java.io.Externalizable, java.io.Serializable

public interface RemoteRef

extends java.io.Externalizable

RemoteRef represents the handle for a remote object. A RemoteStub uses a remote reference to carry out a remote method invocation to a remote object.

Since:

JDK1.1

See Also:

RemoteStub

Field Summary

static java.lang.String	packagePrefix Initialize the server package prefix: assumes that the implementation of server ref classes (e.g., UnicastRef, UnicastServerRef) are located in the package defined by the prefix.
static long	serialVersionUID indicate compatibility with JDK 1.1.x version of class.

Method Summary

java.lang.String	getRefClass(java.io.ObjectOutput out) Returns the class name of the ref type to be serialized onto the stream 'out'.
java.lang.Object	invoke(Remote obj, java.lang.reflect.Method method, java.lang.Object[] params, long opnum) Invoke a method.
boolean	remoteEquals(RemoteRef obj) Compares two remote objects for equality.
int	remoteHashCode() Returns a hashcode for a remote object.
java.lang.String	remoteToString() Returns a String that represents the reference of this remote object.

Methods inherited from interface java.io.Externalizable

readExternal, writeExternal

Field Detail

serialVersionUID

public static final long serialVersionUID

indicate compatibility with JDK 1.1.x version of class.

packagePrefix

public static final java.lang.String packagePrefix

Initialize the server package prefix: assumes that the implementation of server ref classes (e.g., UnicastRef, UnicastServerRef) are located in the package defined by the prefix.

Method Detail

invoke

public java.lang.Object invoke(Remote obj,
                               java.lang.reflect.Method method,
                               java.lang.Object[] params,
                               long opnum)
                        throws java.lang.Exception

Invoke a method. This form of delegating method invocation to the reference allows the reference to take care of setting up the connection to the remote host, marshaling some representation for the method and parameters, then communicating the method invocation to the remote host. This method either returns the result of a method invocation on the remote object which resides on the remote host or throws a RemoteException if the call failed or an application-level exception if the remote invocation throws an exception.

Parameters:

obj - the object that contains the RemoteRef (e.g., the RemoteStub for the object.

method - the method to be invoked

params - the parameter list

opnum - a hash that may be used to represent the method

Returns:

result of remote method invocation

Throws:

java.lang.Exception - if any exception occurs during remote method invocation

Since:

1.2

getRefClass

public java.lang.String getRefClass(java.io.ObjectOutput out)

Returns the class name of the ref type to be serialized onto the stream 'out'.

Parameters:

out - the output stream to which the reference will be serialized

Returns:

the class name (without package qualification) of the reference type

Since:

JDK1.1

remoteHashCode

public int remoteHashCode()

Returns a hashcode for a remote object. Two remote object stubs that refer to the same remote object will have the same hash code (in order to support remote objects as keys in hash tables).

Returns:

remote object hashcode

Since:

JDK1.1

See Also:

Hashtable

remoteEquals

public boolean remoteEquals(RemoteRef obj)

Compares two remote objects for equality. Returns a boolean that indicates whether this remote object is equivalent to the specified Object. This method is used when a remote object is stored in a hashtable.

Parameters:

obj - the Object to compare with

Returns:

true if these Objects are equal; false otherwise.

Since:

JDK1.1

See Also:

Hashtable

remoteToString

public java.lang.String remoteToString()

Returns a String that represents the reference of this remote object.

Returns:

string representing remote object reference

Since:

JDK1.1