本文整理匯總了Golang中github.com/cockroachdb/cockroach/proto.BatchRequest.IsReadOnly方法的典型用法代碼示例。如果您正苦於以下問題:Golang BatchRequest.IsReadOnly方法的具體用法?Golang BatchRequest.IsReadOnly怎麽用?Golang BatchRequest.IsReadOnly使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/cockroachdb/cockroach/proto.BatchRequest
的用法示例。
在下文中一共展示了BatchRequest.IsReadOnly方法的1個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: Send
// Send implements the batch.Sender interface. If the request is part of a
// transaction, the TxnCoordSender adds the transaction to a map of active
// transactions and begins heartbeating it. Every subsequent request for the
// same transaction updates the lastUpdate timestamp to prevent live
// transactions from being considered abandoned and garbage collected.
// Read/write mutating requests have their key or key range added to the
// transaction's interval tree of key ranges for eventual cleanup via resolved
// write intents; they're tagged to an outgoing EndTransaction request, with
// the receiving replica in charge of resolving them.
func (tc *TxnCoordSender) Send(ctx context.Context, ba proto.BatchRequest) (*proto.BatchResponse, *proto.Error) {
tc.maybeBeginTxn(&ba)
ba.CmdID = ba.GetOrCreateCmdID(tc.clock.PhysicalNow())
var startNS int64
// This is the earliest point at which the request has a ClientCmdID and/or
// TxnID (if applicable). Begin a Trace which follows this request.
trace := tc.tracer.NewTrace(&ba)
defer trace.Finalize()
// TODO(tschottdorf): always "Batch"
defer trace.Epoch(fmt.Sprintf("sending %s", ba.Method()))()
ctx = tracer.ToCtx(ctx, trace)
// TODO(tschottdorf): No looping through the batch will be necessary once
// we've eliminated all the redundancies.
for _, arg := range ba.Requests {
trace.Event(fmt.Sprintf("%T", arg.GetValue()))
if err := updateForBatch(arg.GetInner(), ba.RequestHeader); err != nil {
return nil, proto.NewError(err)
}
}
var id string // optional transaction ID
if ba.Txn != nil {
// If this request is part of a transaction...
id = string(ba.Txn.ID)
// Verify that if this Transaction is not read-only, we have it on
// file. If not, refuse writes - the client must have issued a write on
// another coordinator previously.
if ba.Txn.Writing && ba.IsTransactionWrite() {
tc.Lock()
_, ok := tc.txns[id]
tc.Unlock()
if !ok {
return nil, proto.NewError(util.Errorf("transaction must not write on multiple coordinators"))
}
}
// Set the timestamp to the original timestamp for read-only
// commands and to the transaction timestamp for read/write
// commands.
if ba.IsReadOnly() {
ba.Timestamp = ba.Txn.OrigTimestamp
} else {
ba.Timestamp = ba.Txn.Timestamp
}
if rArgs, ok := ba.GetArg(proto.EndTransaction); ok {
et := rArgs.(*proto.EndTransactionRequest)
// Remember when EndTransaction started in case we want to
// be linearizable.
startNS = tc.clock.PhysicalNow()
if len(et.Intents) > 0 {
// TODO(tschottdorf): it may be useful to allow this later.
// That would be part of a possible plan to allow txns which
// write on multiple coordinators.
return nil, proto.NewError(util.Errorf("client must not pass intents to EndTransaction"))
}
if len(et.Key) != 0 {
return nil, proto.NewError(util.Errorf("EndTransaction must not have a Key set"))
}
et.Key = ba.Txn.Key
tc.Lock()
txnMeta, metaOK := tc.txns[id]
if id != "" && metaOK {
et.Intents = txnMeta.intents()
}
tc.Unlock()
if intents := ba.GetIntents(); len(intents) > 0 {
// Writes in Batch, so EndTransaction is fine. Should add
// outstanding intents to EndTransaction, though.
// TODO(tschottdorf): possible issues when the batch fails,
// but the intents have been added anyways.
// TODO(tschottdorf): some of these intents may be covered
// by others, for example {[a,b), a}). This can lead to
// some extra requests when those are non-local to the txn
// record. But it doesn't seem worth optimizing now.
et.Intents = append(et.Intents, intents...)
} else if !metaOK {
// If we don't have the transaction, then this must be a retry
// by the client. We can no longer reconstruct a correct
// request so we must fail.
//
// TODO(bdarnell): if we had a GetTransactionStatus API then
// we could lookup the transaction and return either nil or
// TransactionAbortedError instead of this ambivalent error.
return nil, proto.NewError(util.Errorf("transaction is already committed or aborted"))
}
if len(et.Intents) == 0 {
//.........這裏部分代碼省略.........