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Methods Defined by Modifier That Determine Modifiers
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Remote Method Invocation (RMI)
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Remote Method Invocation (RMI) allows a Java object that executes on one machine to invoke a method of a Java object that executes on another machine This is an important feature, because it allows you to build distributed applications While a complete discussion of RMI is outside the scope of this book, the following example describes the basic principles involved
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A Simple Client/Server Application Using RMI
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This section provides step-by-step directions for building a simple client/server application by using RMI The server receives a request from a client, processes it, and returns a result In this example, the request specifies two numbers The server adds these together and returns the sum
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Step One: Enter and Compile the Source Code
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This application uses four source files The first file, AddServerIntfjava, defines the remote interface that is provided by the server It contains one method that accepts two double arguments and returns their sum All remote interfaces must extend the Remote interface, which is part of javarmi Remote defines no members Its purpose is simply to indicate that an interface uses remote methods All remote methods can throw a RemoteException
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import javarmi*; public interface AddServerIntf extends Remote { double add(double d1, double d2) throws RemoteException; }
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The second source file, AddServerImpljava, implements the remote interface The implementation of the add( ) method is straightforward All remote objects must extend UnicastRemoteObject, which provides functionality that is needed to make objects available from remote machines
import javarmi*; import javarmiserver*; public class AddServerImpl extends UnicastRemoteObject implements AddServerIntf { public AddServerImpl() throws RemoteException { } public double add(double d1, double d2) throws RemoteException { return d1 + d2; } }
The third source file, AddServerjava, contains the main program for the server machine Its primary function is to update the RMI registry on that machine This is done by using the rebind( ) method of the Naming class (found in javarmi) That method associates a name with an object reference The first argument to the rebind( ) method is a string that names the server as AddServer Its second argument is a reference to an instance of AddServerImpl
import javanet*; import javarmi*; public class AddServer { public static void main(String args[]) {
Part II:
The Java Library
try { AddServerImpl addServerImpl = new AddServerImpl(); Namingrebind("AddServer", addServerImpl); } catch(Exception e) { Systemoutprintln("Exception: " + e); } } }
The fourth source file, AddClientjava, implements the client side of this distributed application AddClientjava requires three command-line arguments The first is the IP address or name of the server machine The second and third arguments are the two numbers that are to be summed The application begins by forming a string that follows the URL syntax This URL uses the rmi protocol The string includes the IP address or name of the server and the string AddServer The program then invokes the lookup( ) method of the Naming class This method accepts one argument, the rmi URL, and returns a reference to an object of type AddServerIntf All remote method invocations can then be directed to this object The program continues by displaying its arguments and then invokes the remote add( ) method The sum is returned from this method and is then printed
import javarmi*; public class AddClient { public static void main(String args[]) { try { String addServerURL = "rmi://" + args[0] + "/AddServer"; AddServerIntf addServerIntf = (AddServerIntf)Naminglookup(addServerURL); Systemoutprintln("The first number is: " + args[1]); double d1 = DoublevalueOf(args[1])doubleValue(); Systemoutprintln("The second number is: " + args[2]); double d2 = DoublevalueOf(args[2])doubleValue(); Systemoutprintln("The sum is: " + addServerIntfadd(d1, d2)); } catch(Exception e) { Systemoutprintln("Exception: " + e); } } }
After you enter all the code, use javac to compile the four source files that you created
Step Two: Generate a Stub
Before you can use the client and server, you must generate the necessary stub In the context of RMI, a stub is a Java object that resides on the client machine Its function is to present the same interfaces as the remote server Remote method calls initiated by the client are actually directed to the stub The stub works with the other parts of the RMI system to formulate a request that is sent to the remote machine A remote method may accept arguments that are simple types or objects In the latter case, the object may have references to other objects All of this information must be sent to
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