"True reservation" process in Trove

gistfile1.txt

Resource reservation - assigning resource to specific 
instance via database model for short period of time.

Resource assigning - temporary resource registration 
as component of specific instance by database model.

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What Resource reservation consists of?

1. Reserver (wants resource itself, expiration time, instance id). 
Creates record that tells "This resource is reserved for Instance 
with ID for N minutes". 

2. Watchdog (periodic task that checks if reservation is expired 
and clear record if it is so)

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What Resource reservation model looks like ?
|--------------------------------------------------------------|
|            |          |                 |         |          |
|instance_id | resource | expiration time | expired | consumed |
|            |          |                 |         |          |
|--------------------------------------------------------------|


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Use case ?
 - If we need any resource be reserved for any reasons, we are able to do that.

Where it came from ?
 - Reserving floating ips vai nova before nova server is active.

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