示例#1
0
文件: cache.go 项目: chang290/client
func (c *cache) updateFromTxnCommit(txn *msgs.ClientTxn, txnId *common.TxnId) {
	actions := txn.Actions()
	c.Lock()
	defer c.Unlock()
	for idx, l := 0, actions.Len(); idx < l; idx++ {
		action := actions.At(idx)
		vUUId := common.MakeVarUUId(action.VarId())
		switch action.Which() {
		case msgs.CLIENTACTION_WRITE:
			write := action.Write()
			refs := write.References()
			c.updateFromWrite(txnId, vUUId, write.Value(), &refs)
		case msgs.CLIENTACTION_READWRITE:
			rw := action.Readwrite()
			refs := rw.References()
			c.updateFromWrite(txnId, vUUId, rw.Value(), &refs)
		case msgs.CLIENTACTION_CREATE:
			create := action.Create()
			refs := create.References()
			c.updateFromWrite(txnId, vUUId, create.Value(), &refs)
		case msgs.CLIENTACTION_READ:
			// do nothing
		}
	}
}
示例#2
0
func (cr *connectionRun) clientTxnError(ctxn *cmsgs.ClientTxn, err error, origTxnId *common.TxnId) error {
	seg := capn.NewBuffer(nil)
	msg := cmsgs.NewRootClientMessage(seg)
	outcome := cmsgs.NewClientTxnOutcome(seg)
	msg.SetClientTxnOutcome(outcome)
	if origTxnId == nil {
		outcome.SetId(ctxn.Id())
	} else {
		outcome.SetId(origTxnId[:])
	}
	outcome.SetFinalId(ctxn.Id())
	outcome.SetError(err.Error())
	return cr.sendMessage(server.SegToBytes(seg))
}
示例#3
0
func (sts *SimpleTxnSubmitter) clientToServerTxn(clientTxnCap *cmsgs.ClientTxn, topologyVersion uint32) (*msgs.Txn, []common.RMId, []common.RMId, error) {
	outgoingSeg := capn.NewBuffer(nil)
	txnCap := msgs.NewTxn(outgoingSeg)

	txnCap.SetId(clientTxnCap.Id())
	txnCap.SetRetry(clientTxnCap.Retry())
	txnCap.SetSubmitter(uint32(sts.rmId))
	txnCap.SetSubmitterBootCount(sts.bootCount)
	txnCap.SetFInc(sts.topology.FInc)
	txnCap.SetTopologyVersion(topologyVersion)

	clientActions := clientTxnCap.Actions()
	actions := msgs.NewActionList(outgoingSeg, clientActions.Len())
	txnCap.SetActions(actions)
	picker := ch.NewCombinationPicker(int(sts.topology.FInc), sts.disabledHashCodes)

	rmIdToActionIndices, err := sts.translateActions(outgoingSeg, picker, &actions, &clientActions)
	if err != nil {
		return nil, nil, nil, err
	}

	// NB: we're guaranteed that activeRMs and passiveRMs are
	// disjoint. Thus there is no RM that has some active and some
	// passive actions.
	activeRMs, passiveRMs, err := picker.Choose()
	if err != nil {
		return nil, nil, nil, err
	}
	allocations := msgs.NewAllocationList(outgoingSeg, len(activeRMs)+len(passiveRMs))
	txnCap.SetAllocations(allocations)
	sts.setAllocations(0, rmIdToActionIndices, &allocations, outgoingSeg, true, activeRMs)
	sts.setAllocations(len(activeRMs), rmIdToActionIndices, &allocations, outgoingSeg, false, passiveRMs)
	return &txnCap, activeRMs, passiveRMs, nil
}
示例#4
0
func (cts *ClientTxnSubmitter) SubmitClientTransaction(ctxnCap *cmsgs.ClientTxn, continuation ClientTxnCompletionConsumer) {
	if cts.txnLive {
		continuation(nil, fmt.Errorf("Cannot submit client as a live txn already exists"))
		return
	}

	seg := capn.NewBuffer(nil)
	clientOutcome := cmsgs.NewClientTxnOutcome(seg)
	clientOutcome.SetId(ctxnCap.Id())

	curTxnId := common.MakeTxnId(ctxnCap.Id())

	delay := time.Duration(0)
	retryCount := 0

	var cont TxnCompletionConsumer
	cont = func(txnId *common.TxnId, outcome *msgs.Outcome, err error) {
		if outcome == nil || err != nil { // node is shutting down or error
			cts.txnLive = false
			continuation(nil, err)
			return
		}
		switch outcome.Which() {
		case msgs.OUTCOME_COMMIT:
			cts.versionCache.UpdateFromCommit(txnId, outcome)
			clientOutcome.SetFinalId(txnId[:])
			clientOutcome.SetCommit()
			cts.addCreatesToCache(outcome)
			cts.txnLive = false
			continuation(&clientOutcome, nil)
			return

		default:
			abort := outcome.Abort()
			resubmit := abort.Which() == msgs.OUTCOMEABORT_RESUBMIT
			if !resubmit {
				updates := abort.Rerun()
				validUpdates := cts.versionCache.UpdateFromAbort(&updates)
				server.Log("Updates:", updates.Len(), "; valid: ", len(validUpdates))
				resubmit = len(validUpdates) == 0
				if !resubmit {
					clientOutcome.SetFinalId(txnId[:])
					clientOutcome.SetAbort(cts.translateUpdates(seg, validUpdates))
					cts.txnLive = false
					continuation(&clientOutcome, nil)
					return
				}
			}
			server.Log("Resubmitting", txnId, "; orig resubmit?", abort.Which() == msgs.OUTCOMEABORT_RESUBMIT)
			retryCount++
			switch {
			case retryCount == server.SubmissionInitialAttempts:
				delay = server.SubmissionInitialBackoff
			case retryCount > server.SubmissionInitialAttempts:
				delay = delay + time.Duration(cts.rng.Intn(int(delay)))
				if delay > server.SubmissionMaxSubmitDelay {
					delay = time.Duration(cts.rng.Intn(int(server.SubmissionMaxSubmitDelay)))
				}
			}

			curTxnIdNum := binary.BigEndian.Uint64(txnId[:8])
			curTxnIdNum += 1 + uint64(cts.rng.Intn(8))
			binary.BigEndian.PutUint64(curTxnId[:8], curTxnIdNum)
			ctxnCap.SetId(curTxnId[:])

			cts.SimpleTxnSubmitter.SubmitClientTransaction(ctxnCap, cont, delay, false)
		}
	}

	cts.txnLive = true
	cts.SimpleTxnSubmitter.SubmitClientTransaction(ctxnCap, cont, 0, false)
}