Refactor virtual database total order queue with unique typing
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Key: SEQUOIA-1091
URL: https://forge.continuent.org/jira/browse/SEQUOIA-1091
Project: Sequoia
Type: Improvement
Components: Core
Reporter: Emmanuel Cecchet
Assigned to: Emmanuel Cecchet
Priority: Critical
Fix For: Sequoia 4.0
The DistributedVirtualDatabase total order queue currently just takes objects
and it is currently stuffed with multiple data types leading to a big mess.
When trying to clean the code with generics I found a number of issues with
incompatible data types being put in the total order queue.
I came up with the conclusion that the total order queue should contain
DistributedVirtualDatabaseMessages (DVDM) since it is the incoming queue for
distributed virtual database messages.
Don't be confused with the other total order queue used in backend task queue
which contains tasks and represents the total order queue for each backend
(this one is naturally and properly converted to a list if
BackendTaskQueueEntries with generics without problems).
The proposed refactoring changes some method signatures in load balancers to
use DVDMs instead of objects. It also forces a cleaner split between
RequestManager and DistributedRequestManager.
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