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The Java Developers Almanac 1.4Order this book from Amazon. |
e190. Passing Parameters to a Remote MethodArguments to remote methods must be primitive, serializable, or implementRemote . This example demonstrates the declaration and
use of all three parameter types.
1. Define the remote interface. import java.rmi.*; public interface RObject extends Remote { // This parameter is primitive. void primitiveArg(int num) throws RemoteException; // This parameter implements Serializable. void byValueArg(Integer num) throws RemoteException; // This parameter implements Remote. void byRefArg(ArgObject arg) throws RemoteException; } public interface ArgObject extends Remote { int aMethod() throws RemoteException; }2. Define the remote object implementation. import java.rmi.*; import java.rmi.server.UnicastRemoteObject; public class RObjectImpl extends UnicastRemoteObject implements RObject { public RObjectImpl() throws RemoteException { super(); } public void primitiveArg(int num) throws RemoteException { } public void byValueArg(Integer num) throws RemoteException { } public void byRefArg(ArgObject arg) throws RemoteException { } }3. Compile the remote object implementation. > javac RObject.java RObjectImpl.java4. Generate the skeletons and stubs. > rmic RObjectImpl5. Create an instance of the remote object and bind it to the RMI registry. try { RObject robj = new RObjectImpl(); Naming.rebind("//localhost/RObjectServer", robj); } catch (MalformedURLException e) { } catch (UnknownHostException e) { } catch (RemoteException e) { }6. Look up the remote object and pass the parameters. try { // Look up the remote object RObject robj = (RObject) Naming.lookup("//localhost/RObjectServer"); // Pass a primitive value as argument robj.primitiveArg(1998); // Pass a serializable object as argument robj.byValueArg(new Integer(9)); // Pass a Remote object as argument robj.byRefArg(new ArgObjectImpl()); } catch (MalformedURLException e) { } catch (UnknownHostException e) { } catch (NotBoundException e) { } catch (RemoteException e) { }
e188. Defining and Exporting a Remote Object e189. Looking Up a Remote Object and Invoking a Method e191. Returning Values from a Remote Method e192. Throwing an Exception from a Remote Method © 2002 Addison-Wesley. |