This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
package suncertify.db; ---------------------- class Data - implements criteriaFind() - lock()/unlock() not implemented - deprecated methods replaced package suncertify.db.server; ---------------------------- interface RemoteDataInterface: - same methods as Data plus RemoteException interface DataServerInterface - is a factory of ServerConnection - Has only one method: RemoteDataInterface Connect() class DataServer: - one instance per database - extends Data - implements DataServerInterface - implements lock/unlock behaviour. keeps all locks granted to all clients in a list - Connect returns an instance of ServerConnection. class ServerConnection - Is an adapter class that delegates calls to the single DataServer instance - implements RemoteDataInterface - one instance per client connection - keeps a list of locks granted to this client. lock()/unlock() keep this list updated to validate calls. like to avoid unlocking records not locked by the client.
package suncertify.client; ----------------------- interface DataConnection: - same methods as Data class. - throws only DatabaseException in all methods. - The gui client uses this interface to access the database. class RemoteDataConnection - implements DataConnection - Adapter class that delegates all calls to an instance of RemoteDataInterface - when delegating calls to the internal RemoteDataInterface, all exceptions catched are bubbled up canned in a new DatabaseException class LocalDataConnection - implements DataConnection - Adapter class that delegates all calls to an instance of Data - All exceptions catched when delegating calls to the internal Data are thrown wrapped in a new DatabaseException. class DataConnector - singleton with only two static methods: DataConnection connectLocal (databasefile); DataConnection connectRemote(String host); - these methods returns instances of RemoteDataConnection or LocalDataConnection depending on the connection mode. [ March 24, 2003: Message edited by: Marcos Motta ] [ March 24, 2003: Message edited by: Marcos Motta ]