Writing Data Client

[Valeri Mikhailov]

My instruction:
“To connect with your server, you should create a client program. This implementation should include a class that implements the same public methods as the suncertify.db.Data class, although it will need different constructors to allow it to support the network configuration.”
But my implementation include tow classes: DBClient that implements the same public methods as the suncertify.db.Data class and DBController that has different constructors to allow it to support the network configuration. Am I going to have less points as I don’t follow the instruction?

[Jawad Kakar]

I have only one interfac which implements all public method of data and one more method

 public interface DataClient{
  public FieldInfo [] getFieldInfo() throws IOException;
  public int getRecordCount() throws IOException;
  public DataInfo getRecord(int recNum) throws DatabaseException, IOException;
  public DataInfo find(String toMatch) throws DatabaseException, IOException;
  public void add(String [] newData) throws DatabaseException, IOException;
  public void modify(DataInfo newData) throws DatabaseException, IOException;
  public void delete(DataInfo toDelete) throws DatabaseException, IOException;
  public void close() throws IOException;
  public DataInfo[] criteriaFind(String criteria )throws InvalidCriteriaException, DatabaseException, IOException;
  public void lock(int recNum)throws IOException;
  public void unlock(int recNum)throws IOException;
  public DataClient getConnection() throws IOException;
}
 

RemoteServer interface extends DataClient.

 
public interface RemoteServer extends java.rmi.Remote, DataClient{
 // no methods
}

LocaldataAccess class implements DataClient.
RemotedataAccess class implements RemoteServer.
Jawad
[ December 25, 2002: Message edited by: Jawad Kakar ]

[Valeri Mikhailov]

But they ask: “although it will need different constructors to allow it to support the network configuration.”
And I don’t have getConnection () method in my Data class?

[John Smith]

But my implementation include tow classes: DBClient that implements the same public methods as the suncertify.db.Data class and DBController that has different constructors to allow it to support the network configuration. Am I going to have less points as I don�t follow the instruction?

What Sun has in mind is some sort of a factory that creates instances of Data based on the database location, something like this:

public class DataFactory {
...
    public Database getData(String serverDNS, int serverPort, String databaseName) {
...
    }
    public Database getData(String databaseName) {
...
    }
}

If this is what your DBController does, that will do it, although I wouldn't name this class as "DbController".
Eugene.