ConnectionManager interface provides a hook for the resource adapter to
pass a connection request to the application server.
An application server provides implementation of the ConnectionManager
interface. This implementation is not specific to any particular type of
the resource adapter or connection factory interface.
The ConnectionManager implementation delegates to the application
server to enable latter to provide quality of services (QoS) - security,
connection pool management, transaction management and error
logging/tracing.
An application server implements these services in a generic manner,
independent of any resource adapter and EIS specific mechanisms. The
connector architecture does not specify how an application server
implements these services; the implementation is specific to an
application server.
After an application server hooks-in its services, the connection
request gets delegated to a ManagedConnectionFactory instance either
for the creation of a new physical connection or for the matching of
an already existing physical connection.
An implementation class for ConnectionManager interface is
required to implement the java.io.Serializable interface.
In the non-managed application scenario, the ConnectionManager
implementation class can be provided either by a resource adapter (as
a default ConnectionManager implementation) or by application
developers. In both cases, QOS can be provided as components by third
party vendors. | 