Event Adapter

Question

Hi,
Am using WLI2.1 te develop my adapter. When one is defining Application
Views, one can define different connection parameters, say for DBMS adapter,
2 application views can connect to 2 separate databases. Now, if I define 2
events, 1 each in each application view, then these events should listen for
the particular events on their respective databases. I was looking at the
DBMS sampe adapter, in this the EventGenerator makes connection to the
database,
using the values (username, password, dbName etc) defined in EventRouter's
web.xml file, and it listens to events in the database which is define in
web.xml file.
Can anyone suggest, how the 2 different events can listen for the events on
their respective databases, means, event generator creates connection using
the paramters,
defined for the application views, rather than using web.xml file.
One way I can think of is to create separate instances of a 'handler' class
from the method setUpNewTypes for each 'type' of connection.
Can anyone suggest any other way, or may be something ADK provides which am
not aware of.
Thanks
Amit

Answer 1

Many thanks for the reply! From the reply, it seems that my finding above about TopLink caching is valid and there is a difference in TopLink cache handling between 9.0.3 and 9.0.4 in this case.
Since it would be a lot of code changes for me to register the change of the Last_Updated field within each and every unit of work, I have to take the approach of using an event listener, in this case, the Descriptor Event Adapter.
I am not clear about the way I should do from your reply, to ensure that TopLink cache can recoganize the change in value for the field Last_Updated.
Here are the class and methods that I have implemented and they do not work with 9.0.4 but works correctly with 9.0.3:
public class LastUpdateHandler extends oracle.toplink.descriptors.DescriptorEventAdapter {
public void aboutToUpdate(DescriptorEvent event) {
               MyObject mo=(MyObject)event.getObject();
               if (event.getDescriptor().getMappingForAttributeName("lastUpdated")!=null) {
                    mo.setLastUpdated(new Timestamp(System.currentTimeMillis()));
                    event.getRow().remove("LAST_UPDATED");
                    event.applyAttributeValuesIntoRow("lastUpdated");
     public void aboutToInsert(DescriptorEvent event) {
               MyObject mo=(VisionObject)event.getObject();
               if (event.getDescriptor().getMappingForAttributeName("lastUpdated")!=null) {
                    mo.setLastUpdated(new Timestamp(System.currentTimeMillis()));
                    event.getRow().remove("LAST_UPDATED");
                    event.applyAttributeValuesIntoRow("lastUpdated");
Any guidance or suggestion?