Java Remote Method Invocation: 2 - Java Distributed Object Model - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

Java Remote Method Invocation

2.3 The Distributed and Nondistributed Models Contrasted

The Java distributed object model is similar to the Java object model in the following ways:

A reference to a remote object can be passed as an argument or returned as a result in any method invocation (local or remote).

A remote object can be cast to any of the set of remote interfaces supported by the implementation using the built-in Java syntax for casting.

The built-in Java instanceof operator can be used to test the remote interfaces supported by a remote object.

The Java distributed object model differs from the Java object model in these ways:

Clients of remote objects interact with remote interfaces, never with the implementation classes of those interfaces.

Non-remote arguments to, and results from, a remote method invocation are passed by copy rather than by reference. This is because references to objects are only useful within a single virtual machine.

A remote object is passed by reference, not by copying the actual remote implementation.

The semantics of some of the methods defined by class java.lang.Object are specialized for remote objects.

Since the failure modes of invoking remote objects are inherently more complicated than the failure modes of invoking local objects, clients must deal with additional exceptions that can occur during a remote method invocation.

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