realtime inter-VM communication in front desk trading sys

Inter-VM is our focus.

* [s] MOM — async
** FIX over RV in Lehman Eq
* [s] distributed cache — async?

Above mechanisms notify listeners. Note Listeners are usually async and multi-threaded.

* DB writes by one app, and periodic DB polling by receiving app
* [s] RMI
* [s] EJB? infrequent. I think this is less efficient than MOM
* [s] web service? not sure
* FTP? not real-time but at SOD (startOfDay) and EOD
* email? none

MOM is the clear favorite. Most efficient. Guaranteed

Within my front office app, RMI, MOM and cache are dominant. Within a related ticketing system (iticket), MOM and RMI are dominant.

DB is an extreme form of synchronous pub/sub.

[s=needs object serialization. cross-VM often requires serializable]

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