55:182/22C:182. Distributed Application Frameworks Java RMI, CORBA, Web Services (SOAP)
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1 55:182/22C:182 Distributed Application Frameworks Java RMI, CORBA, Web Services (SOAP) Broker Architecture Example Java Remote Method Invocation (RMI) Invoking a method which lies in a different address space Invoking a method in another JVM Transfer of control and passing of objects between JVMs Dynamic class loading, call backs to applets, and distributed objects 1
2 RMI Reference Java Tutorial ml RMI Structure 2
3 RMI Structure Server registers a service (remote object) with the registry RMI Structure Client looks up remote object (by name) in registry 3
4 RMI Structure Client transparently invokes method(s) on remote object via a local interface RMI Structure Existing web server(s) used to load class bytecodes for objects as needed 4
5 RMI General Approach to Creating a Distributed Application Design and implement and compile the individual components remote interface(s) remote objects (server) client(s) Use the rmic compiler to create stubs and skeletons for remote objects Make classes network accessible (via a web server) Client Server Calendar Example Use Remote Method Invocation to communicate Server Files Client Files CalendarImpl.java CalendarUser.java icalendar.java icalendar.java Calendarimpl.class Calendaruser.class Calendarimpl_Stub.class CalendarImpl_Stub.class Calendarimpl _ Skel.class rmic creates stub & skeleton skel acts as Server Side Proxy Copied from Server Acts as Client Side Proxy 5
6 Remote Interface package compute; import java.rmi.remote; import java.rmi.remoteexception; public interface Compute extends Remote { <T> T executetask(task<t> t) throws RemoteException; 6
7 Compute Interface package compute; public interface Task<T> { T execute(); Implementing the Remote Interface package engine; import java.rmi.remoteexception; import java.rmi.registry.locateregistry; import tjava.rmi.registry.registry; i i t import java.rmi.server.unicastremoteobject; import compute.compute; import compute.task; public class ComputeEngine implements Compute { public ComputeEngine() { super(); public <T> T executetask(task<t> t) { return t.execute(); public static void main(string[] args) { if (System.getSecurityManager() == null) System.setSecurityManager(new SecurityManager()); 7
8 Remote Interface Implementation (continued try { String name = "Compute"; Compute engine = new ComputeEngine(); Compute stub = (Compute)UnicastRemoteObject.exportObject(engine, 0); Registry registry = LocateRegistry.getRegistry(); registry.rebind(name, stub); System.out.println("ComputeEngine bound"); catch (Exception e) { System.err.println("ComputeEngine exception:"); e.printstacktrace(); package client; Client Implementation import java.rmi.registry.locateregistry; import java.rmi.registry.registry; import java.math.bigdecimal; import compute.compute; public class ComputePi { public static void main(string args[]) { if (System.getSecurityManager() == null) { System.setSecurityManager(new SecurityManager()); try { String name = "Compute"; Registry registry = LocateRegistry.getRegistry(args[0]); Compute comp = (Compute) registry.lookup(name); Pi task = new Pi(Integer.parseInt(args[1])); BigDecimal pi = comp.executetask(task); System.out.println(pi); catch (Exception e) { System.err.println("ComputePi exception:"); e.printstacktrace(); 8
9 Task Interface Implementaton package client; import compute.task; import java.io.serializable; import java.math.bigdecimal; public class Pi implements Task<BigDecimal>, Serializable { private static final long serialversionuid = 227L; /** constants used in pi computation */ private static final BigDecimal FOUR = BigDecimal.valueOf(4); /** rounding mode to use during pi computation */ private static final int roundingmode = BigDecimal.ROUND_HALF_EVEN; /** digits of precision after the decimal point */ private final int digits; /** * Construct a task to calculate pi to the specified *precision. */ public Pi(int digits) { this.digits = digits; see Java RMI tutorial for remaining code. 9
10 RMI Security Manager Since RMI permits dynamic downloading of new classes and passing of objects between systems, it has obvious potential security risks Current version of RMI requires the use of security managers which were not shown in the previous example See the Java Tutorial for details CORBA (Common Object Request Broker Architecture) 10
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