Implementing Data interface in local and network mode

[Aruneesh Salhotra]

The interface describes the interface method as
readRecord throws RecordNotFoundException ... etc etc..

In local mode, one could simply do
localInterface implements DataMain

But in case of network mode,
networkInterface implements DataMain, would require methods also throwing RemoteException.

This wont compile.

How are others handling this when doing the same with RMI. The base interface has to be Data I would assume.

[Kevin Conaway]

Aruneesh,

I would suggest buying a book on design patterns and studying up on the Adapter pattern.

Kevin

[Aruneesh Salhotra]

One of the books I have by "Apress" suggests that I created Interface

public interface DVDDatabaseRemote extends Remote, DBClient
{
}

public interface DBClient
{
public DVD getDVD(String upc) throws IOException, ClassNotFoundException;
}

public class DVDDatabaseImp extends UnicastRemoteObject implements DVDDatabaseRemote
{
public DVDDatabaseImpl() throws RemoteException{
}

public DVD getDVD(String upc) throws RemoteException, IOException, CLassNotFoundException{
return <somevalue>;
}
}



But doing a similar thing, I get compilation errors, that RemoteException is not defined in the interface DBClient.

[Kevin Conaway]

Aruneesh,

Try something like

interface Foo {
void foo();
}
 
interface RemoteFoo() {
void foo() throws RemoteException;
}
 
class FooImpl() implements Foo {
void foo() {
System.out.println("bar");
}
}
 
class RemoteFooImpl() implements RemoteFoo {
void foo() throws RemoteException {
System.out.println("remote bar");
}
}
 
class FooAdapter implements Foo {

RemoteFoo remoteFoo;

FooAdapter(RemoteFoo foo) {
remoteFoo = foo;
}
 
void foo() {
try {
remoteFoo.foo();
} catch( RemoteException ex) { 
// oops
}
}
}
 

Kevin
[ February 17, 2006: Message edited by: Kevin Conaway ]

[Aruneesh Salhotra]

I am not sure if this mentioned in the assignment. I specifies a Data interface with few methods. Ofcourse none of the methods throw any RemoteException.

Are we at luxury of defining similar interface for RMI.