# RMI Example – Numerical Integration, a more realistic RMI example that sends an evaluatable object (function) from a client to a server for numerical integration. #Programming Code Examples #Java/J2EE/J2ME #Network Programming

# RMI Example - Numerical Integration, a more realistic RMI example that sends an evaluatable object (function) from a client to a server for numerical integration. 

Integral.java  Performs actual numerical integration of the function (evaluatable object).

/** A class to calculate summations and numeric integrals. The
 *  integral is calculated according to the midpoint rule.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class Integral {
  /** Returns the sum of f(x) from x=start to x=stop, where the
   *  function f is defined by the evaluate method of the
   *  Evaluatable object.
   */

  public static double sum(double start, double stop,
                           double stepSize,
                           Evaluatable evalObj) {
    double sum = 0.0, current = start;
    while (current  0) ? args[0] : "localhost";
      RemoteIntegral remoteIntegral =
        (RemoteIntegral)Naming.lookup("rmi://" + host +
                                      "/RemoteIntegral");
      for(int steps=10; steps 0) ? args[0] : "localhost";
      RemoteIntegral remoteIntegral =
        (RemoteIntegral)Naming.lookup("rmi://" + host +
                                      "/RemoteIntegral");
      for(int steps=10; steps< =10000; steps*=10) {
        System.out.println
          ("Approximated with " + steps + " steps:" +
           "n  Integral from 0 to pi of sin(x)=" +
           remoteIntegral.integrate(0.0, Math.PI,
                                    steps, new Sin()) +
           "n  Integral from pi/2 to pi of cos(x)=" +
           remoteIntegral.integrate(Math.PI/2.0, Math.PI,
                                    steps, new Cos()) +
           "n  Integral from 0 to 5 of x^2=" +
           remoteIntegral.integrate(0.0, 5.0, steps,
                                    new Quadratic()));
      }
      System.out.println
        ("`Correct' answer using Math library:" +
         "n  Integral from 0 to pi of sin(x)=" +
         (-Math.cos(Math.PI) - -Math.cos(0.0)) +
         "n  Integral from pi/2 to pi of cos(x)=" +
         (Math.sin(Math.PI) - Math.sin(Math.PI/2.0)) +
         "n  Integral from 0 to 5 of x^2=" +
         (Math.pow(5.0, 3.0) / 3.0));
    } catch(RemoteException re) {
      System.out.println("RemoteException: " + re);
    } catch(NotBoundException nbe) {
      System.out.println("NotBoundException: " + nbe);
    } catch(MalformedURLException mfe) {
      System.out.println("MalformedURLException: " + mfe);
    }
  }
}

rmiclient.policy  Policy file for the client. Grants permissions for the client to connect to the RMI server and Web server. 

//  Taken from Core Web Programming from
//  Prentice Hall and Sun Microsystems Press,
//  .
//  © 2001 Marty Hall and Larry Brown;
//  may be freely used or adapted.

grant {
  // rmihost - RMI registry and the server
  // webhost - HTTP server for stub classes
  permission java.net.SocketPermission 
    "rmihost:1024-65535", "connect";
  permission java.net.SocketPermission 
    "webhost:80", "connect";
};

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10239
Categories:Programming Code Examples, Java/J2EE/J2ME, Network Programming
Tags:Java/J2EE/J2MENetwork Programming
Post Data:2017-01-02 16:04:28

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