Blocking Problem

[phil999]

I have a user input blocking problem. I have a menu where thne user enters commands at the command prompt. The application is always listening for user input with the following line which is blocking:

String InputRead.readLine();

However this code is for the client of an RMI Callback server. The server can callback the client with messages that need client feedback. So I have another blocking readLine(); call for user input.

So when the callback looks for user feedback, what the user enters goes to the menu readline() rather than the callback readline(). Is there anyway I can send the menu class to sleep while I give the server feedback - or is there a better way around this?

client menu code:

boolean userDone = false;
	while (!userDone) {
		//Get User Response
         String userResponse = br.readLine();

         // SEND CHAT MESSAGE
			 if ((userResponse.trim()).equals("1") || (userResponse.trim()).equals("1.") || (userResponse.trim()).equals("Send")) {//   Send a Chat Message

				  System.out.println( // Get UserName
						"Who do you want to send a message to?");
					String sendToUser = br.readLine();
					
				  System.out.println( // Get Message
						"Enter message to send to " + sendToUser + " :");
					String sendMessage = br.readLine();
					
				  serverInterface.directMessage(sendToUser, UserName, sendMessage);
					
					
				//Show User the Main Menu
				 clientMenu();
			}
		 
		 // LIST CHATROOM MEMBERS
			 else if ((userResponse.trim()).equals("2") || (userResponse.trim()).equals("2.") || (userResponse.trim()).equals("List")) {//   List all members in Chatroom
				
				//Call List Members from Server
				 String listMembers = serverInterface.listChatMembers();
				 System.out.println("Members in Chatroom: \n" + listMembers);
				//Show User the Main Menu
				 clientMenu();
			}
		 
		 // DISCONNECT FROM SERVER
			 else if ((userResponse.trim()).equals("3") || (userResponse.trim()).equals("3.") || (userResponse.trim()).equals("Leave")) {//    if user wants to disconnect

				 serverInterface.unregisterForCallback(UserName, callbackObj);
				 System.out.println("You have left the Chatroom.");
				//Show User the Connect / End Program Menu
				connectMenu();
			}
			//INCORRECT USER SELECTION
			else { // if user makes wrong selection
				System.out.println("Select a number from the menu !");
			} // end if
		} // end while
	   } // end try

      catch (Exception ex) {
         ex.printStackTrace( );
      } //end catch

client server callback:

public class CallbackClientImpl extends UnicastRemoteObject
     implements CallbackClientInterface {
  
   public CallbackClientImpl() throws RemoteException {
      super( );
   }

   public String notifyMe(String message){
      String returnMessage = message;
      System.out.println(returnMessage);
      return returnMessage;
   }      
   
   public String getMessage(int messageNumber, String userName, String message) throws RemoteException, IOException {
      boolean userDone = false;
	  String userResponse = "";
	  
      System.out.println("Do you wish to receive a message from " + userName + "? (Y/N)");
	  
	  
	  InputStreamReader is = new InputStreamReader(System.in);
	  BufferedReader br = new BufferedReader(is);
	  
	  
	  while (!userDone) {
	  
		 userResponse = br.readLine();
		
		//USER ACCEPTS MESSAGE
		if ((userResponse.trim()).equals("Y") || (userResponse.trim()).equals("Y.") || (userResponse.trim()).equals("Yes")) {
			userDone = true;
			System.out.println(userName + ": " + message);
		//USER REJECTS MESSAGE
		} else if ((userResponse.trim()).equals("N") || (userResponse.trim()).equals("N.") || (userResponse.trim()).equals("No")) {
			userDone = true;
			System.out.println("Message Rejected.");
		}
		//INCORRECT USER SELECTION
		else { // if user makes wrong selection
				System.out.println("Please enter 'Y' for Yes or 'N' for No !");

		}//end if
	  }// loop
	  
      return userResponse.trim();
   } 

}// end CallbackClientImpl class