如何传递导出的 RMI-IIOP 对象的远程引用

Question

假设我想将以下 RMI-IIOP 导出对象的远程引用传递给接收器（这是另一个远程对象）：

public interface MyInterface extends Remote
{
    public void send(Receiver receiver);

    public String sayHello();

}

public class MyObject implements MyInterface
{
    public MyObject()
    {
        PortableRemoteObject.exportObject(this); // I know I could extend PortableRemoteObject instead
    }

    public void send(Receiver receiver)
    {
        // which one is correct?

        /* 1. */ receiver.receive(this);
        /* 2. */ receiver.receive(this.toStub());
        /* 3. */ // other things, such as narrow...
    }

    public String sayHello() { return "hello"; }
}

这是接收方法的实现：

public void receive(Remote remote)
{
    MyInterface myObjectRef = (MyInterface) PortableRemoteObject.narrow(remote, MyInterface.class);
    System.out.println(myObjectRef.sayHello());
}

目标是 sayHello() 方法的正确远程调用。

谢谢。

Answer 1

它们是等价的。 RMI 的语义规定导出的远程对象作为它们自己的存根传递。