func TxnFromCap(exe *dispatcher.Executor, vd *VarDispatcher, stateChange TxnLocalStateChange, ourRMId common.RMId, txnCap *msgs.Txn) *Txn {
txnId := common.MakeTxnId(txnCap.Id())
actions := txnCap.Actions()
txn := &Txn{
Id: txnId,
Retry: txnCap.Retry(),
writes: make([]*common.VarUUId, 0, actions.Len()),
TxnCap: txnCap,
exe: exe,
vd: vd,
stateChange: stateChange,
}
allocations := txnCap.Allocations()
for idx, l := 0, allocations.Len(); idx < l; idx++ {
alloc := allocations.At(idx)
rmId := common.RMId(alloc.RmId())
if ourRMId == rmId {
txn.populate(alloc.ActionIndices(), actions)
break
}
}
return txn
}
func deflateTxn(txn *msgs.Txn, seg *capn.Segment) *msgs.Txn {
if isDeflated(txn) {
return txn
}
deflatedTxn := msgs.NewTxn(seg)
deflatedTxn.SetId(txn.Id())
deflatedTxn.SetRetry(txn.Retry())
deflatedTxn.SetSubmitter(txn.Submitter())
deflatedTxn.SetSubmitterBootCount(txn.SubmitterBootCount())
deflatedTxn.SetFInc(txn.FInc())
deflatedTxn.SetTopologyVersion(txn.TopologyVersion())
deflatedTxn.SetAllocations(txn.Allocations())
actionsList := txn.Actions()
deflatedActionsList := msgs.NewActionList(seg, actionsList.Len())
deflatedTxn.SetActions(deflatedActionsList)
for idx, l := 0, actionsList.Len(); idx < l; idx++ {
deflatedAction := deflatedActionsList.At(idx)
deflatedAction.SetVarId(actionsList.At(idx).VarId())
deflatedAction.SetMissing()
}
return &deflatedTxn
}
func NewBallotAccumulator(txnId *common.TxnId, txn *msgs.Txn) *BallotAccumulator {
actions := txn.Actions()
ba := &BallotAccumulator{
Txn: txn,
txnId: txnId,
vUUIdToBallots: make(map[common.VarUUId]*varBallot),
outcome: nil,
incompleteVars: actions.Len(),
dirty: false,
}
vBallots := make([]varBallot, ba.incompleteVars)
for idx := 0; idx < ba.incompleteVars; idx++ {
action := actions.At(idx)
vUUId := common.MakeVarUUId(action.VarId())
vBallot := &vBallots[idx]
vBallot.vUUId = vUUId
ba.vUUIdToBallots[*vUUId] = vBallot
}
allocs := txn.Allocations()
for idx, l := 0, allocs.Len(); idx < l; idx++ {
alloc := allocs.At(idx)
if alloc.Active() == 0 {
break
}
indices := alloc.ActionIndices()
for idy, m := 0, indices.Len(); idy < m; idy++ {
vBallots[int(indices.At(idy))].voters++
}
}
return ba
}
func MakeAbortBallots(txn *msgs.Txn, alloc *msgs.Allocation) []*eng.Ballot {
actions := txn.Actions()
actionIndices := alloc.ActionIndices()
ballots := make([]*eng.Ballot, actionIndices.Len())
for idx, l := 0, actionIndices.Len(); idx < l; idx++ {
action := actions.At(int(actionIndices.At(idx)))
vUUId := common.MakeVarUUId(action.VarId())
ballots[idx] = eng.NewBallot(vUUId, eng.AbortDeadlock, nil)
}
return ballots
}
func TxnToRootBytes(txn *msgs.Txn) []byte {
seg := capn.NewBuffer(nil)
txnCap := msgs.NewRootTxn(seg)
txnCap.SetId(txn.Id())
txnCap.SetRetry(txn.Retry())
txnCap.SetSubmitter(txn.Submitter())
txnCap.SetSubmitterBootCount(txn.SubmitterBootCount())
txnCap.SetActions(txn.Actions())
txnCap.SetAllocations(txn.Allocations())
txnCap.SetFInc(txn.FInc())
txnCap.SetTopologyVersion(txn.TopologyVersion())
return server.SegToBytes(seg)
}
func isDeflated(txn *msgs.Txn) bool {
actions := txn.Actions()
return actions.Len() != 0 && actions.At(0).Which() == msgs.ACTION_MISSING
}