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Turns out we do still need a Start() method after all. Not for lack
of trying, but I can't get away from the client and server doing some
sort of handshake at the beginning to avoid either raciness on the
client side or artificial delays on the server side.
I don't particularly like the "start" signal I've added -- I'd much
prefer subclassing -- but I'm trying to keep the changes incremental.
Expose the instance and class structures, move instance members to a
private structure. This is also towards having the TransactionClass
follow a template pattern.
A few changes:
- Modify the D-Bus API to include a Finish() method instead of a Start()
method, the idea being the client calls Finish() to obtain the final
status and optional message once the transaction indicates it's done.
Calling Finish() also removes the transaction object from the bus.
- Introduce Transaction class as a thin wrapper for RPMOSTreeTransaction.
Stores the status info for Finish(), detects when the caller's bus name
vanishes, and emits various status signals to TransactionMonitor.
- Introduce TransactionMonitor as a factory class for Transactions that
also handles book keeping chores like tracking the active Transaction.
The Sysroot and OS interfaces share a TransactionMonitor instance.
