CSE 660 Lab 2 Khoi Pham Thanh Ho April 27 th, 2015

Transcription

1 CSE 660 Lab 2 Khoi Pham Thanh Ho April 27 th, 2015 Comment and Evaluation: This lab focuses on two ways to call a function from Client to Server: Remote Procedure Call (RPC) is basic method in C for Server to call a remote function from Client. Java Remote Method Invocation (RMI): is used in Java to reference to remote objects and invoke their methods. Overall, RMI is more powerful for complicated Client Server programs, while RPC is easier and more useful for pure send receive architecture. Evaluation: We have done everything in the lab successfully, therefore, I would rate our works 50/50. Part I Remote Procedure Call 1. What is XDR and what is it for: XDR is the routines of library for external data representation. It allows us to explain arbitrary data structures in a machine-independent fashion, and it uses for Remote Procedure Call. 2. How do you compile an input file into XDR routine: We use the operation c 3. $rpcgen -C -a rand.x In this command, -C generates code in ANSI C, this option also generates code that could be compiled with the C++ compiler. a generates all the files including sample code for client and server side. Write our own 20 Random numbers Generator: Code: In Client: //rand_client.c #include "rand.h" double radn_prog_1(char host) { CLIENT clnt;

2 void result_1; long initialize_random_1_arg; double result_2; char get_next_random_1_arg; #ifndef DEBUG clnt = clnt_create (host, RADN_PROG, RAND_VERS, "udp"); if (clnt == NULL) { clnt_pcreateerror (host); exit (1); #endif / DEBUG result_1 = initialize_random_1(&initialize_random_1_arg, clnt); if (result_1 == (void ) NULL) { clnt_perror (clnt, "call failed"); result_2 = get_next_random_1((void)&get_next_random_1_arg, clnt); if (result_2 == (double ) NULL) { clnt_perror (clnt, "call failed"); #ifndef DEBUG clnt_destroy (clnt); #endif / DEBUG return result_2; int main (int argc, char argv[]) { char host; if (argc < 2) { printf ("usage: %s server_host\n", argv[0]); exit (1); host = argv[1]; radn_prog_1 (host); double x; int i; printf("\n twenty random numbers "); for ( i = 0; i < 20; ++i ){ x = radn_prog_1 (host); printf(" %f, ", x );

3 exit (0); In Server: //rand_server.c #include "rand.h" #include <time.h> void initialize_random_1_svc(long argp, struct svc_req rqstp) { static char result; / insert server code here return (void ) &result; double get_next_random_1_svc(void argp, struct svc_req rqstp) { static double result; / insert server code here srand(time(null)); result += rand(); // if ( result >= 1.0 ) result -= 0.713; return &result;

4 Running Program: Description: We ran Server from jb356-0 and jb-356-1, then we ran Client on jb They both returned 20 random generated numbers.

5 Part II Java Remote Method Invocation ( RMI ) 2. Program that invoke addition function: Source code: Client program for the RMI Addition //Client.java import java.rmi.naming; import java.util.scanner; public class Client { public static void main(string[] argv) { Scanner reader = new Scanner(System.in); System.out.print("Enter the first number: "); double firstnumber = reader.nextdouble(); System.out.print("Enter the second number: "); double secondnumber = reader.nextdouble(); double result; try { RmiAdditionInterface addtionremoteobject = (RmiAdditionInterface) Naming.lookup("rmi://" + argv[0] + "/RmiAddition"); result = addtionremoteobject.add(firstnumber, secondnumber); System.out.printf("The sum is: %f\n", result); catch (Exception e) { System.out.println("RMI Addition exception: " + e); Remote Class for the RMI Addition: //RmiAddition.java import java.rmi.; import java.rmi.server.; public class RmiAddition extends UnicastRemoteObject implements RmiAdditionInterface { private static final long serialversionuid = 1L;

6 / Construct a remote object public RmiAddition() throws RemoteException { / Implementation of the remotely the sum of the remote RemoteException if the remote invocation public double add(double firstnumber, double secondnumber) throws RemoteException { return firstnumber + secondnumber; Remote Interface for RMI Addition // RmiAdditionInterface.java import java.rmi.; public interface RmiAdditionInterface extends Remote { the sum of the two RemoteException if the remote invocation fails. public double add(double firstnumber, double secondnumber) throws RemoteException; Server program for the Rmi addition //Server.java import java.rmi.; public class Server { public static void main(string[] argv) { try {

7 Naming.rebind("RmiAddition", new RmiAddition()); System.out.println("Rmi Addition Server is ready."); catch (Exception e) { System.out.println("Rmi Addition Server failed: " + e); Manifest for Server: // Manifest.mf Manifest-Version: 1.0 Main-Class: Server Manifest for Client: // Manifest.mf Manifest-Version: 1.0 Main-Class: Client Compile and Running Program: First we try to compile and run pure command without using.jar:

8 Description: I ran Server on koi-aspire-vn7-591g and Client on Jodi-Inspiron There was an error creating connection because of my /ect/hosts file was all led to Then I used root access to edit it to my IP address as the right side of the picture above. Everything worked perfect after that. Then, we try to compile again using.jar files: Description: As we can see, in the directory windows, the.jar files are generated.

9 3. Program that invoke random generate function: Source code: Client program for the RMI Addition //Client.java import java.rmi.naming; public class Client { public static void main(string[] argv) { / getting the argument from the command line int numberargument = argv.length; if (numberargument!= 2 && numberargument!= 4) { System.out.println("Usage (check arguments): Server <host> <n> <lower bound> <upper bound>"); System.exit(0); int[] randomarray = new int[integer.parseint(argv[1])]; try { RmiRandGenInterface randomgenremoteobject = (RmiRandGenInterface) Naming.lookup("rmi://" + argv[0] + "/RmiRandGen"); if (numberargument == 2) { randomarray = randomgenremoteobject.nrandgen(integer.parseint(argv[1])); / if the range is provided if (numberargument == 4) { randomarray = randomgenremoteobject.nrandgenwithrange( Integer.parseInt(argv[1]), Integer.parseInt(argv[2]), Integer.parseInt(argv[3])); / print out the array for (int i = 0; i < Integer.parseInt(argv[1]); i++) { System.out.printf("%d\n", randomarray[i]);

10 catch (Exception e) { System.out.println("RMI Random Number Generator exception: " + e); Remote Class for the RMI Addition. // RmiRandGen.java import java.rmi.remoteexception; import java.rmi.server.unicastremoteobject; import java.util.random; public class RmiRandGen extends UnicastRemoteObject implements RmiRandGenInterface { private static final long serialversionuid = 1L; / Construct a remote the message of the remote RemoteException if the object handle cannot be constructed. public RmiRandGen() throws RemoteException { / Implementation of the remotely an int array with n random RemoteException if the remote invocation fails. public int[] nrandgen(int n) throws RemoteException { int[] randarray = new int[n]; Random randomgen = new Random(); for (int i = 0; i < n; i++) {

11 randarray[i] = (int) randomgen.nextint( ); return randarray; / Implementation of the remotely array of n random numbers within the range min, RemoteException if the remote invocation public int[] nrandgenwithrange(int n, int min, int max) throws RemoteException { int[] randarray = new int[n]; Random randomgen = new Random(); for (int i = 0; i < n; i++) { randarray[i] = min + (int) randomgen.nextint((max - min) + 1); return randarray; Remote Interface for the "Hello, world!" example. // RmiRandGenInterface.java import java.rmi.; public interface RmiRandGenInterface extends Remote { array of n random RemoteException if the remote invocation fails. public int[] nrandgen(int n) throws RemoteException; array of n random numbers within the range min, RemoteException if the remote invocation fails.

12 public int[] nrandgenwithrange(int n, int min, int max) throws RemoteException; Server program //Server.java import java.rmi.; public class Server { public static void main(string[] argv) { try { Naming.rebind("RmiRandGen", new RmiRandGen()); System.out.println("Random Number Generator Server is ready."); catch (Exception e) { System.out.println("Rmi Random Number Generator Server failed: " + e); Manifest.mf files in Client and Server are similar to question number 2.

13 Compile and Running Program: Description: In Client input, the format is: java Client <host> <n> if no range java Client <host> <n> <min> <max> if there is a range. For example, in the picture above, the Client command was: java jar RmiRandGen-Client.jar This meant I commanded to generate 5 random numbers from 10 to 99.