Information Technology Reference
In-Depth Information
F
IG
. 4. Order entry sample application: orders.
that will actually be used by the application, and replicate that subset to the device.
This is often done through ad hoc, but effective, business rules. For example, a sales-
man may not need to have the entire set of customer data replicated; only the set of
customers in her district is typically needed.
After this initial setup is performed, the mobile device repeatedly executes the
following life-cycle:
Stage 1 (Propagate server updates):
Before disconnecting, the server's updates
are propagated to the device.
Stage 2 (Execution):
User executes one or more business applications on the dis-
connected device.
Stage 3 (Propagate client updates):
Device reconnects to server, and propagates
its updates to the server-side database.
