Hello all,
I've been through many of the basic EJB tutorials/examples listed in
books
or on web sites, but I'm looking for a different type of example. The
ones
I've seen all seem to touch on the same type of subject, for example: A
user/client accesses his/her bank account and can add or withdraw money
from
it. The EJB server authenticates the user and updates the user's
account as
necessary and persists the account information in some for, etc, etc.
What I'm looking for is an example, direction, or advice on the
following
type of scenario: The server provides a stock ticker type of service.
The
server is continually receiving "live" stock data for some data feed and
is
storing the data in some database. Users can connect to the server to
receive this live stock data.
How does this type of service get implemented in an EJB server? I can't
see
the stock ticker service being a session bean since it exists and is
"running" even when there are no clients. Does than mean that it should
be
an entity bean? All of the examples I've seen describe entity beans as
EJBs
that represent objects that are to be persisted, so that would seen to
suggest that the actual stock data would be represented by an entity
bean,
not the stock ticker service itself.
Would the stock ticker service be a non-EJB service that session EJBs
accessed on behalf of the client? Any help, suggestions, examples would
be
greatly appreciated.
Doug
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