title Commit in FoundationDB

participant "Client" as C
participant "GetReadVersionProxy" as GRV
participant "CommitProxy" as P
participant "Master" as M
participant "Resolver" as R
participant "TLog" as T
	
C ->> GRV: Request read version
GRV ->> M: Request committed version
M ->> GRV: Respond committed version
GRV ->> C: Respond read version
	
C ->> P: Commit a mutation with read version
  
box right of P: Pre-resolution
P ->> M: Request a commit version
alt New request
	M ->> P: Commit version
else Replied before with a commit version
	M ->> P: Commit version
else Replied before without commit version
	M --x P: Never
end
  
box right of P: Resolution
P ->> R: Send the transaction to the resolver
alt No conflict
	R ->> P: TransactionCommitted
else Conflict
	R ->> P: TransactionConflict
else Read snapshot older than oldest version
	R ->> P: TransactionTooOld
end
  
box right of P: Post-resolution
P ->> T: Push the transaction data to TLog
alt TLog not stopped
	T ->> P: The version of the transactions that are already durable
else TLog stopped
	T ->> P: tlog_stopped
end  
  
box right of P: Reply
P ->> M: Report raw commit version
M -->> P: Void
alt Commit successful
	P ->> C: Commit version
else Conflict
	P ->> C: Not committed: conflict
else Transaction too old
	P ->> C: Not committed: too old
end