How to declare a variable value during running java RMI server?

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Hi, I am new in Java RMI and trying to do some learning in different condition. I don't know what I am trying to do is appropriate or not.  I am trying to set a variable value during starting the server which is accessible to client. Let me explain what I have tried so far and what I am trying to do.

What I have tried:

So far I have developed an RMI application where client gives an input & get the factorial for that. I have 4 class for the application.
Those along with code are following.

Server class - FacServer

Java

import java.rmi.*;
public class FacServer.java
{
public static void main(String a[]) throws Exception
{
    FacImpl obj = new FacImpl();
    Naming.rebind("FAC",obj);
    System.out.println("Server started");
}
}

Client Class - FacClient.java

Java

import java.util.*;
import java.io.*;
import java.rmi.*;

public class FacClient
{
public static void main(String a[]) throws Exception
{
  FacInt obj = (FacInt)Naming.lookup("FAC");
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  System.out.print("Enter a number: ");
  String s = null;
  try {
     s = br.readLine();
  } catch(IOException ioe) {
     System.err.println(ioe.getMessage());
  }
    int r = Integer.parseInt(s);
    int n= obj.fac(r);

    System.out.println("Factorial is "+n);
}
}

Implementation Class - FacImpl.java

Java

<pre>import java.rmi.server.*;
public class FacImpl extends UnicastRemoteObject implements FacInt 
{
public FacImpl() throws Exception
{
    super();
}
public int fac(int x)
{
int i,j=1;
for(i=x;i>1;i--)
j=j*i;
return j;
}
}

Interface Class - FacInt.java

Java

import java.rmi.Remote;
public interface FacInt extends Remote
{
public int fac(int x) throws Exception;
}

It works fine. Now I want to set some limitation in server side. For example server won't calculate the factorial value for more than 5. I know I can do it in implementation class easily. But I want to declare it when I start the server. For example to set limitation 5 I should start the server in following way.

java FacServer 5

So if client input a value more than 5 it will get an error reply. Is it possible to do so?

Also can I show the factorial value in server side also if client provide an accepted value?

Posted 3-Nov-17 19:00pm

Member 13441993

Updated 4-Nov-17 4:28am

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Richard MacCutchan · Accepted Answer · 2017-11-03T23:28:00

You can modify your server and implementation as follows:

Java

public class FacServer.java
{
public static void main(String a[]) throws Exception
{
    int maximum = 5; // default max value
    if (a.length > 0)
        maximum = Integer.parseInt(a[0]);
    FacImpl obj = new FacImpl(maximum);
    Naming.rebind("FAC",obj);
    System.out.println("Server started");
}
}

Java

<pre>public class FacImpl extends UnicastRemoteObject implements FacInt 
{
    int maxValue;
    public FacImpl(int max) throws Exception
    {
        super();
        maxValue = max;
    }

    public int fac(int x)
    {
        if (x > maxValue)
        {
             // error code here
        }
        int i,j=1;
        for(i=x;i>1;i--)
        j=j*i;
        return j;
    }
}

Member 13441993 · Accepted Answer · 2017-11-04T04:28:00

Thanks a lot. That worked like a charm.

I have edited the code in following way.

FacImpl

Java

import java.rmi.server.*;
import java.util.*;
import http://java.io.*;
import java.math.*;
public class FacImpl extends UnicastRemoteObject implements FacInt
{
int limit;
public FacImpl(int limit) throws Exception
{
super();
this.limit = limit;
}
public int fac(int x) throws Exception
{
if (x > limit)
throw new IllegalArgumentException(
String.format("Cannot calulate Fac beyond %1", limit));
else{
int i,j=1;
for(i=x;i>1;i--)
j=j*i;
return j;
}
}
}

FacServer

Java

import java.rmi.*;
import java.util.*;
import java.io.*;
import java.math.*;
public class FacServer
{
public static void main(String a[]) throws Exception
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter a number: ");
String s = null;
try {
s = br.readLine();
} catch(IOException ioe) {
System.err.println(ioe.getMessage());
}
int limit = Integer.parseInt(s);
if ((a != null) && (a.length > 0)) {
try {
int temp = Integer.parseInt(a[0]);
if (temp > 0)
limit = temp;
} catch (NumberFormatException e) {
}
}
FacImpl obj = new FacImpl(limit);
Naming.rebind("FAC",obj);
System.out.println("Server started");
}
}

Also I wanted to show the factorial result in server instead of client. Is it possible to do so?

How to declare a variable value during running java RMI server?

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