Exporting an Object

There are two choices when creating a remote object:

Extend UnicastRemoteObject class, or
Export the object by using one of the static functions of UnicastRemoteObject.

The central theme of this chapter is how to explicitly export a remote object. The source code needed for this example is stored in the examples\Greater directory. The "Greater" directory contains the following files:

• GreaterInterface.java
• GreaterServerImpl.java
• GreaterClient.java
• Compile.bat
• Rmicompile.bat
• RunServer.bat
• RunClient.bat

Server Architecture

The design of the server is simple. The server starts a registry service, registers itself with the registry, and exports a method.

Creating Remote Interface

The GreaterInterface contains only one method that returns a string object. The getGreater() method compares two given numbers and returns the larger number.

Listing 4.1 GreaterInterface.java (Complete code)

import java.rmi.*;

//server interface
public interface GreaterInterface 
	extends Remote{


//method used to compare two given numbers		
public String getGreater(int one,int two)
	throws RemoteException;
}