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Articles : Advanced Topics in Java :
Bi-Directional Communication in Distributed Remote Objects :

Contents
Introduction to Remote Method Invocation
The Problem Definition
Creating the Remote Interface
Implementing the Interfaces
The Server Starter
The Client Starter
Running the Application

The triggers that fire the gun!

Once the client and server objects are ready, let's write some code to get these objects in place. Two small programs that start off the process on the server and the client respectively are called ServerStarter and ClientStarter.

The Server Starter:

  1. Starts the registry on the server
  2. Creates an instance of our PopupServerImpl and binds it to the registry
  3. Waits for the any of the clients or the console to transmit a message to all other clients
The registry can be started by independently invoking the registry from the prompt (by launching rmiregisrty.exe) or from within the code like this:

public static void main(String args[]){
   LocateRegistry.createRegistry(5000);
   ServerImpl serverobj = new SevrerImpl();
   Naming.rebind("//:5000/ServerPop" , serverobj);
   }

That's all it takes for the server to bind the object to the registry. The rest of the code puts the server in a loop and waits for a message to be typed on the console by the admin to be sent to all users who are logged on.

BufferedReader br = new BufferReader( new InputStreamReader( System.in));

while(true){
	String message = br.readLine();
	 Serverobj.sendMessage(message);
}

NEXT


Sameer Tyagi is a Software Engineer with several years of programming experience in iNet application development and has conducted multiple training workshops in Java. Besides holding an Engineering degree in Electronics he is a Sun Certified Java 1.1 Programmer.
Email: sameertyagi@usa.net

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