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From Knut Anders Hatlen <Knut.Hat...@Sun.COM>
Subject Re: [jira] Updated: (DERBY-796) jdbc 4.0 specific Blob and Clob method support
Date Thu, 16 Feb 2006 16:17:05 GMT

I have one additional comment to the patch.

ClientJDBCObjectFactory, ClientJDBCObjectFactoryImpl and
ClientJDBCObjectFactoryImpl40 are in the org.apache.derby.jdbc
package. I think only classes that are part of our external interface
should be part of that package. The classes that are currently there
are ClientDriver, ClientDataSource and
ClientConnectionPoolDataSource. I don't feel the factory classes
belong there. I also think it's a problem that the constructor for the
NetResultSet class must be made public because the factory
implementation is in the "wrong" package.

The package hierarchy in the client driver is something like this (I
apologize to the client driver experts if my explanation is a

  * org.apache.derby.jdbc which contains the external interface,
  * org.apache.derby.client.am with the internal interface, and
  * org.apache.derby.client.net with the actual (protocol-specific)

My feeling is that the ClientJDBCObjectFactory interface belongs in
am, and ClientJDBCObjectFactoryImpl* in net. In order to follow the
naming convention that is already used in the client driver, I would
suggest these class/interface names (or something similar):


Additionally, I wonder if the method signatures in the factory
interface are as generic as they should be. There are a lot of newNet*
methods. I thought the whole point with factory methods was to hide
the implementation details.

For instance, the method newNetConnection() has this signature:

 NetConnection newNetConnection(NetLogWriter netLogWriter,
                                String databaseName,
                                java.util.Properties properties)
      throws SqlException;

Wouldn't it be more the Derby way (not that the Derby way necessarily
is the best way...) to rename it to newConnection() and let it have
the following signature:

 Connection newConnection(LogWriter logWriter,
                          String databaseName,
                          java.util.Properties properties)
      throws SqlException;

Knut Anders

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