IKH331-07-java-rmi

Java RMI, 17 November 2011

 Methods can be called by another JVM on a different host Interface is remote if it extends Remote Remote object implements a remote interface and extends UnicastRemoteObjectPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 2

 Primitive types are passed by value Objects (that are not remote)  They are serialized and then passed by value.  At the other end the objects are deserialized  Any references inside the object are also serialized Remote Objects  Passed as remote references (stubs)Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 3

 Obtain a reference for the remote object URL for the remote object is specified as  rmi://host:port/namePemrograman Terdistribusi Sistem Terdistribusi (IKH331) 4

public class HiDunia { public String sayHalo() { return "Halo dunia!"; } public static void main (String args[]) { String response = this.sayHalo(); System.out.println(response); }}Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 5

public class Halo { public String sayHalo() { return "Hello, world!"; }}public class HaloDunia { public static void main (String args[]) { Halo kelas = new Halo(); String response = kelas.sayHalo(); System.out.println(response); }}Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 6

 Satu address space  Code segment  Data segment  Stack segmentPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 7

 Proses berbeda  class Halo  class HaloDunia  mungkin berjalan di node yang sama  atau node berbeda Different address space stub method Remote objectPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 8

 Mendefinisikan remote interface Mengimplementasikan interface (server)  Buat dan ekspor remote object  Registrasi remote object dengan Java RMI registry Mengimplementasikan client Jalankan server Jalankan clientPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 9

import java.rmi.Remote;import java.rmi.RemoteException;public interface Hello extends Remote { String sayHello() throws RemoteException;}Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 10

import java.rmi.Remote;import java.rmi.registry.Registry;import java.rmi.registry.LocateRegistry;import java.rmi.RemoteException;import java.rmi.server.UnicastRemoteObject;public class Server implements Hello { public Server() {} public String sayHello() { return "Hello, world!"; }Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 11

public static void main(String args[]) { try { Server obj = new Server(); Hello stub = (Hello) UnicastRemoteObject.exportObject(obj, 0); // Bind the remote objects stub in the registry Registry registry = LocateRegistry.getRegistry(); registry.bind("Hello", stub); System.err.println("Server ready"); } catch (Exception e) { System.err.println("Server exception: " + e.toString()); e.printStackTrace(); } }}Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 12

import java.rmi.registry.LocateRegistry;import java.rmi.registry.Registry;public class Client { private Client() {} public static void main(String[] args) { String host = (args.length < 1) ? null : args[0]; try { Registry registry = LocateRegistry.getRegistry(host); Hello stub = (Hello) registry.lookup("Hello"); String response = stub.sayHello(); System.out.println("response: " + response); } catch (Exception e) { System.err.println("Client exception: " + e.toString()); e.printStackTrace(); } }}Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 13

javac –d destDir Server.javajavac –d destDir Client.javastart rmiregistryjava –Djava.rmi.server.codebase=file:destDir/ Serverjava –Djava.rmi.server.codebase=file:destDir/ ClientPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 14

 Default pada port 1099 start rmiregistry 2011 Registry reg = LocateRegistry.getRegistry(2011);Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 15

 Implementasikan sebuah aplikasi kalkulator sederhana dengan RMI  Client menerima ekspresi matematika (+, x, /, -)  Server mengimplementasikan method-method yang sesuai Parsing ekspresi matematika dengan StringTokenizer  untuk menentukan method apa yang dipanggilPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 16

 Kerangka program Client  Baca ekspresi matematika  Tokenize, untuk mendapatkan ekspresi matematik yang digunakan  Jika operatornya +, panggil method RMI penjumlahan()  Jika operatornya x, panggil method RMI perkalian()  dstPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 17

 Program Server  Implementasikan method-method untuk operasi dasar matematika  int perkalian(int a, int b);  int pembagian(int a, int b);  int penjumlahan(int a, int b);  int pengurangan(int a, int b);Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 18

 Waktu pengerjaan  Dua pekan (30 November 2011, pukul 12.00 WIB)  By e-mail barliant@gmail.com  Subject "IKH331 RMI" Bonus  Evaluasi ekspresi yang lebih kompleks  3+4x2  (3 + 4) x 2  Pengumpulan sebelum tenggat waktuPemrograman Terdistribusi Sistem Terdistribusi (IKH331) 19

 Java RMI Hello World, http://download.oracle.com/javase/6/docs/tec hnotes/guides/rmi/hello/hello-world.html Vijay Garg, "Concurrent and Distributed Programming in Java" Source code http://users.ece.utexas.edu/~garg/jbk.html http://tjerdastangkas.blogspot.com/search/la bel/ikh331Pemrograman Terdistribusi Sistem Terdistribusi (IKH331) 20

Kamis, 17 November 2011

IKH331-07-java-rmi

by Anung Ariwibowo on Nov 16, 2011

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IKH331-07-java-rmi — Presentation Transcript