MTS: MICROSOFT
TRANSACTION SERVER
Introducing MTS Microsoft's Component Server, providing transactions through
DCOM channels from client to server and component methods! Component pooling
provided by MTS allocates components to applications transparent to the
applications! One component is re-used by
persistent context by
multiple applications! MTS provides connections by virtual reference to
context objects rather than
CreateObject!
The Lady Avatar provides virtual
connections signified by her two fingers by making and breaking the connections
after use! If you see three fingers you are correct, given she provides a third
saving grace by connecting to the component again after it is available.
Pooling of resources is thereby provided by our Lady of Avatar! The hand is
quicker than the eye! When the component completes the job by notifying our Lady
of Avatar with SetComplete or SetAbort she returns the component
to the pool. Traditionally stateful components kept their lock on memory
and the system for the entire application, however MTS provides a stateless
environment so that components are re-used over and over again without concern
of the state!
TRANSACTIONS
Transactions that are atomic (either complete or not complete),
consistent (no rules are broken), isolated (not affected by other
transactions) and durable (persist) pass the ACID test! MTS
provides stable, reliable database and customer transactions.
EXAMPLE
MTS provides by the Transaction Server an interface for the
Client to the Component. A database connection is setup from the component
by ADO Data Access and OLEDB/ODBC with a Resource Manager that accesses the Data
Tables. The DTC (Distributed Transaction Coordinator)
provides management of driver software for the above connection.
A Retail store acts as the Transaction Server to provide the interface
for the Client to purchase an item or component. This provides the
connection to the component analogous to MTS. Once the Client purchases
the item the Salesperson provides the ADO connection that accesses the
register that access the database by OLEDB/ODBC. Entering the customer
information at the register is stored in the database, with purchase price and
method of payment.
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