func (txn *Txn) populate(actionIndices capn.UInt16List, actions msgs.Action_List) {
localActions := make([]localAction, actionIndices.Len())
txn.localActions = localActions
var action *localAction
actionIndicesIdx := 0
actionIndex := -1
if actionIndicesIdx < actionIndices.Len() {
actionIndex = int(actionIndices.At(actionIndicesIdx))
action = &localActions[actionIndicesIdx]
}
for idx, l := 0, actions.Len(); idx < l; idx++ {
actionCap := actions.At(idx)
if idx == actionIndex {
action.Txn = txn
action.vUUId = common.MakeVarUUId(actionCap.VarId())
}
switch actionCap.Which() {
case msgs.ACTION_READ:
if idx == actionIndex {
readCap := actionCap.Read()
readVsn := common.MakeTxnId(readCap.Version())
action.readVsn = readVsn
}
case msgs.ACTION_WRITE:
if idx == actionIndex {
action.writeTxnActions = &actions
action.writeAction = &actionCap
txn.writes = append(txn.writes, action.vUUId)
} else {
txn.writes = append(txn.writes, common.MakeVarUUId(actionCap.VarId()))
}
case msgs.ACTION_READWRITE:
if idx == actionIndex {
readWriteCap := actionCap.Readwrite()
readVsn := common.MakeTxnId(readWriteCap.Version())
action.readVsn = readVsn
action.writeTxnActions = &actions
action.writeAction = &actionCap
txn.writes = append(txn.writes, action.vUUId)
} else {
txn.writes = append(txn.writes, common.MakeVarUUId(actionCap.VarId()))
}
case msgs.ACTION_CREATE:
if idx == actionIndex {
createCap := actionCap.Create()
positions := common.Positions(createCap.Positions())
action.writeTxnActions = &actions
action.writeAction = &actionCap
action.createPositions = &positions
txn.writes = append(txn.writes, action.vUUId)
} else {
txn.writes = append(txn.writes, common.MakeVarUUId(actionCap.VarId()))
}
case msgs.ACTION_ROLL:
if idx == actionIndex {
rollCap := actionCap.Roll()
readVsn := common.MakeTxnId(rollCap.Version())
action.readVsn = readVsn
action.writeTxnActions = &actions
action.writeAction = &actionCap
action.roll = true
txn.writes = append(txn.writes, action.vUUId)
} else {
txn.writes = append(txn.writes, common.MakeVarUUId(actionCap.VarId()))
}
default:
panic(fmt.Sprintf("Unexpected action type: %v", actionCap.Which()))
}
if idx == actionIndex {
actionIndicesIdx++
if actionIndicesIdx < actionIndices.Len() {
actionIndex = int(actionIndices.At(actionIndicesIdx))
action = &localActions[actionIndicesIdx]
}
}
}
if actionIndicesIdx != actionIndices.Len() {
panic(fmt.Sprintf("Expected to find %v local actions, but only found %v", actionIndices.Len(), actionIndicesIdx))
}
}
func (sts *SimpleTxnSubmitter) translateActions(outgoingSeg *capn.Segment, picker *ch.CombinationPicker, actions *msgs.Action_List, clientActions *msgs.ClientAction_List) (map[common.RMId]*[]int, error) {
referencesInNeedOfPositions := []*msgs.VarIdPos{}
rmIdToActionIndices := make(map[common.RMId]*[]int)
createdPositions := make(map[common.VarUUId]*common.Positions)
for idx, l := 0, clientActions.Len(); idx < l; idx++ {
clientAction := clientActions.At(idx)
action := actions.At(idx)
action.SetVarId(clientAction.VarId())
var err error
var hashCodes []common.RMId
switch clientAction.Which() {
case msgs.CLIENTACTION_READ:
sts.translateRead(&action, &clientAction)
case msgs.CLIENTACTION_WRITE:
sts.translateWrite(outgoingSeg, &referencesInNeedOfPositions, &action, &clientAction)
case msgs.CLIENTACTION_READWRITE:
sts.translateReadWrite(outgoingSeg, &referencesInNeedOfPositions, &action, &clientAction)
case msgs.CLIENTACTION_CREATE:
var positions *common.Positions
positions, hashCodes, err = sts.translateCreate(outgoingSeg, &referencesInNeedOfPositions, &action, &clientAction)
if err != nil {
return nil, err
}
vUUId := common.MakeVarUUId(clientAction.VarId())
createdPositions[*vUUId] = positions
case msgs.CLIENTACTION_ROLL:
sts.translateRoll(outgoingSeg, &referencesInNeedOfPositions, &action, &clientAction)
default:
panic(fmt.Sprintf("Unexpected action type: %v", clientAction.Which()))
}
if hashCodes == nil {
hashCodes, err = sts.hashCache.GetHashCodes(common.MakeVarUUId(action.VarId()))
if err != nil {
return nil, err
}
if clientAction.Which() == msgs.CLIENTACTION_ROLL && hashCodes[0] != sts.rmId {
return nil, AbortRollError
}
}
hashCodes = hashCodes[:sts.topology.TwoFInc]
picker.AddPermutation(hashCodes)
for _, rmId := range hashCodes {
if listPtr, found := rmIdToActionIndices[rmId]; found {
*listPtr = append(*listPtr, idx)
} else {
// Use of l for capacity guarantees an upper bound: there
// are only l actions in total, so each RM can't possibly
// be involved in > l actions. May waste a tiny amount of
// memory, but minimises mallocs and copying.
list := make([]int, 1, l)
list[0] = idx
rmIdToActionIndices[rmId] = &list
}
}
}
// Some of the references may be to vars that are being
// created. Consequently, we must process all of the actions first
// to make sure all the positions actually exist before adding the
// positions into the references.
for _, vUUIdPos := range referencesInNeedOfPositions {
vUUId := common.MakeVarUUId(vUUIdPos.Id())
positions, found := createdPositions[*vUUId]
if !found {
positions = sts.hashCache.GetPositions(vUUId)
}
if positions == nil {
return nil, fmt.Errorf("Txn contains reference to unknown var %v", vUUId)
}
vUUIdPos.SetPositions((capn.UInt8List)(*positions))
}
return rmIdToActionIndices, nil
}