Implementation concretization / parking requests

Question

Hi,
how would you implement the following problem?
I’ve got 4 Objects:
E (Enquirer) and R (Receiver);
M (Message) and P (Packet)
M(id) := Message with id x
P(id, nr) := Packet with id x and number y.
A set of P(id, nr) represents a message M(id).
R receives, stores and manages objects of type P(id, nr) and builds M(id) if all P(id, nr) are available.
Now, E asks R (E ->> R) for M(id) by calling r.getMessage(id)
[R contains method: [code]Message getMessage(int id)]
If all packets are available R returns M(id). But in general it needs some time to get access of all packets. So, the call of E for M(id) must be parked as long as the packets aren’t available.
My solution:
I generate for every request of E a thread which implements the interface and returns the message M(id) if ready. But I think it isn’t a very good solution: If 500 E’s asks for M’s it could be critical regarding performance issues. Ok, an Thread pool can be helpful in this situation.
Do you see a better solution to implement this case?
Thanks for help!!!
Chris

Answer 1

Hi:
Refer to this documentation.
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCBMTWFMMM/BCBMTWFMMM.pdf
Please let me know if you need more information.
Assign points if useful.
Regards
MSReddy