// Code generated by protoc-gen-go. DO NOT EDIT.
// source: google/spanner/v1/transaction.proto

package spanner // import "google.golang.org/genproto/googleapis/spanner/v1"

import proto "github.com/golang/protobuf/proto"
import fmt "fmt"
import math "math"
import duration "github.com/golang/protobuf/ptypes/duration"
import timestamp "github.com/golang/protobuf/ptypes/timestamp"
import _ "google.golang.org/genproto/googleapis/api/annotations"

// Reference imports to suppress errors if they are not otherwise used.
var _ = proto.Marshal
var _ = fmt.Errorf
var _ = math.Inf

// This is a compile-time assertion to ensure that this generated file
// is compatible with the proto package it is being compiled against.
// A compilation error at this line likely means your copy of the
// proto package needs to be updated.
const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package

// # Transactions
//
//
// Each session can have at most one active transaction at a time. After the
// active transaction is completed, the session can immediately be
// re-used for the next transaction. It is not necessary to create a
// new session for each transaction.
//
// # Transaction Modes
//
// Cloud Spanner supports two transaction modes:
//
//   1. Locking read-write. This type of transaction is the only way
//      to write data into Cloud Spanner. These transactions rely on
//      pessimistic locking and, if necessary, two-phase commit.
//      Locking read-write transactions may abort, requiring the
//      application to retry.
//
//   2. Snapshot read-only. This transaction type provides guaranteed
//      consistency across several reads, but does not allow
//      writes. Snapshot read-only transactions can be configured to
//      read at timestamps in the past. Snapshot read-only
//      transactions do not need to be committed.
//
// For transactions that only read, snapshot read-only transactions
// provide simpler semantics and are almost always faster. In
// particular, read-only transactions do not take locks, so they do
// not conflict with read-write transactions. As a consequence of not
// taking locks, they also do not abort, so retry loops are not needed.
//
// Transactions may only read/write data in a single database. They
// may, however, read/write data in different tables within that
// database.
//
// ## Locking Read-Write Transactions
//
// Locking transactions may be used to atomically read-modify-write
// data anywhere in a database. This type of transaction is externally
// consistent.
//
// Clients should attempt to minimize the amount of time a transaction
// is active. Faster transactions commit with higher probability
// and cause less contention. Cloud Spanner attempts to keep read locks
// active as long as the transaction continues to do reads, and the
// transaction has not been terminated by
// [Commit][google.spanner.v1.Spanner.Commit] or
// [Rollback][google.spanner.v1.Spanner.Rollback].  Long periods of
// inactivity at the client may cause Cloud Spanner to release a
// transaction's locks and abort it.
//
// Reads performed within a transaction acquire locks on the data
// being read. Writes can only be done at commit time, after all reads
// have been completed.
// Conceptually, a read-write transaction consists of zero or more
// reads or SQL queries followed by
// [Commit][google.spanner.v1.Spanner.Commit]. At any time before
// [Commit][google.spanner.v1.Spanner.Commit], the client can send a
// [Rollback][google.spanner.v1.Spanner.Rollback] request to abort the
// transaction.
//
// ### Semantics
//
// Cloud Spanner can commit the transaction if all read locks it acquired
// are still valid at commit time, and it is able to acquire write
// locks for all writes. Cloud Spanner can abort the transaction for any
// reason. If a commit attempt returns `ABORTED`, Cloud Spanner guarantees
// that the transaction has not modified any user data in Cloud Spanner.
//
// Unless the transaction commits, Cloud Spanner makes no guarantees about
// how long the transaction's locks were held for. It is an error to
// use Cloud Spanner locks for any sort of mutual exclusion other than
// between Cloud Spanner transactions themselves.
//
// ### Retrying Aborted Transactions
//
// When a transaction aborts, the application can choose to retry the
// whole transaction again. To maximize the chances of successfully
// committing the retry, the client should execute the retry in the
// same session as the original attempt. The original session's lock
// priority increases with each consecutive abort, meaning that each
// attempt has a slightly better chance of success than the previous.
//
// Under some circumstances (e.g., many transactions attempting to
// modify the same row(s)), a transaction can abort many times in a
// short period before successfully committing. Thus, it is not a good
// idea to cap the number of retries a transaction can attempt;
// instead, it is better to limit the total amount of wall time spent
// retrying.
//
// ### Idle Transactions
//
// A transaction is considered idle if it has no outstanding reads or
// SQL queries and has not started a read or SQL query within the last 10
// seconds. Idle transactions can be aborted by Cloud Spanner so that they
// don't hold on to locks indefinitely. In that case, the commit will
// fail with error `ABORTED`.
//
// If this behavior is undesirable, periodically executing a simple
// SQL query in the transaction (e.g., `SELECT 1`) prevents the
// transaction from becoming idle.
//
// ## Snapshot Read-Only Transactions
//
// Snapshot read-only transactions provides a simpler method than
// locking read-write transactions for doing several consistent
// reads. However, this type of transaction does not support writes.
//
// Snapshot transactions do not take locks. Instead, they work by
// choosing a Cloud Spanner timestamp, then executing all reads at that
// timestamp. Since they do not acquire locks, they do not block
// concurrent read-write transactions.
//
// Unlike locking read-write transactions, snapshot read-only
// transactions never abort. They can fail if the chosen read
// timestamp is garbage collected; however, the default garbage
// collection policy is generous enough that most applications do not
// need to worry about this in practice.
//
// Snapshot read-only transactions do not need to call
// [Commit][google.spanner.v1.Spanner.Commit] or
// [Rollback][google.spanner.v1.Spanner.Rollback] (and in fact are not
// permitted to do so).
//
// To execute a snapshot transaction, the client specifies a timestamp
// bound, which tells Cloud Spanner how to choose a read timestamp.
//
// The types of timestamp bound are:
//
//   - Strong (the default).
//   - Bounded staleness.
//   - Exact staleness.
//
// If the Cloud Spanner database to be read is geographically distributed,
// stale read-only transactions can execute more quickly than strong
// or read-write transaction, because they are able to execute far
// from the leader replica.
//
// Each type of timestamp bound is discussed in detail below.
//
// ### Strong
//
// Strong reads are guaranteed to see the effects of all transactions
// that have committed before the start of the read. Furthermore, all
// rows yielded by a single read are consistent with each other -- if
// any part of the read observes a transaction, all parts of the read
// see the transaction.
//
// Strong reads are not repeatable: two consecutive strong read-only
// transactions might return inconsistent results if there are
// concurrent writes. If consistency across reads is required, the
// reads should be executed within a transaction or at an exact read
// timestamp.
//
// See [TransactionOptions.ReadOnly.strong][google.spanner.v1.TransactionOptions.ReadOnly.strong].
//
// ### Exact Staleness
//
// These timestamp bounds execute reads at a user-specified
// timestamp. Reads at a timestamp are guaranteed to see a consistent
// prefix of the global transaction history: they observe
// modifications done by all transactions with a commit timestamp <=
// the read timestamp, and observe none of the modifications done by
// transactions with a larger commit timestamp. They will block until
// all conflicting transactions that may be assigned commit timestamps
// <= the read timestamp have finished.
//
// The timestamp can either be expressed as an absolute Cloud Spanner commit
// timestamp or a staleness relative to the current time.
//
// These modes do not require a "negotiation phase" to pick a
// timestamp. As a result, they execute slightly faster than the
// equivalent boundedly stale concurrency modes. On the other hand,
// boundedly stale reads usually return fresher results.
//
// See [TransactionOptions.ReadOnly.read_timestamp][google.spanner.v1.TransactionOptions.ReadOnly.read_timestamp] and
// [TransactionOptions.ReadOnly.exact_staleness][google.spanner.v1.TransactionOptions.ReadOnly.exact_staleness].
//
// ### Bounded Staleness
//
// Bounded staleness modes allow Cloud Spanner to pick the read timestamp,
// subject to a user-provided staleness bound. Cloud Spanner chooses the
// newest timestamp within the staleness bound that allows execution
// of the reads at the closest available replica without blocking.
//
// All rows yielded are consistent with each other -- if any part of
// the read observes a transaction, all parts of the read see the
// transaction. Boundedly stale reads are not repeatable: two stale
// reads, even if they use the same staleness bound, can execute at
// different timestamps and thus return inconsistent results.
//
// Boundedly stale reads execute in two phases: the first phase
// negotiates a timestamp among all replicas needed to serve the
// read. In the second phase, reads are executed at the negotiated
// timestamp.
//
// As a result of the two phase execution, bounded staleness reads are
// usually a little slower than comparable exact staleness
// reads. However, they are typically able to return fresher
// results, and are more likely to execute at the closest replica.
//
// Because the timestamp negotiation requires up-front knowledge of
// which rows will be read, it can only be used with single-use
// read-only transactions.
//
// See [TransactionOptions.ReadOnly.max_staleness][google.spanner.v1.TransactionOptions.ReadOnly.max_staleness] and
// [TransactionOptions.ReadOnly.min_read_timestamp][google.spanner.v1.TransactionOptions.ReadOnly.min_read_timestamp].
//
// ### Old Read Timestamps and Garbage Collection
//
// Cloud Spanner continuously garbage collects deleted and overwritten data
// in the background to reclaim storage space. This process is known
// as "version GC". By default, version GC reclaims versions after they
// are one hour old. Because of this, Cloud Spanner cannot perform reads
// at read timestamps more than one hour in the past. This
// restriction also applies to in-progress reads and/or SQL queries whose
// timestamp become too old while executing. Reads and SQL queries with
// too-old read timestamps fail with the error `FAILED_PRECONDITION`.
type TransactionOptions struct {
	// Required. The type of transaction.
	//
	// Types that are valid to be assigned to Mode:
	//	*TransactionOptions_ReadWrite_
	//	*TransactionOptions_ReadOnly_
	Mode                 isTransactionOptions_Mode `protobuf_oneof:"mode"`
	XXX_NoUnkeyedLiteral struct{}                  `json:"-"`
	XXX_unrecognized     []byte                    `json:"-"`
	XXX_sizecache        int32                     `json:"-"`
}

func (m *TransactionOptions) Reset()         { *m = TransactionOptions{} }
func (m *TransactionOptions) String() string { return proto.CompactTextString(m) }
func (*TransactionOptions) ProtoMessage()    {}
func (*TransactionOptions) Descriptor() ([]byte, []int) {
	return fileDescriptor_transaction_ec0699010b3c5244, []int{0}
}
func (m *TransactionOptions) XXX_Unmarshal(b []byte) error {
	return xxx_messageInfo_TransactionOptions.Unmarshal(m, b)
}
func (m *TransactionOptions) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
	return xxx_messageInfo_TransactionOptions.Marshal(b, m, deterministic)
}
func (dst *TransactionOptions) XXX_Merge(src proto.Message) {
	xxx_messageInfo_TransactionOptions.Merge(dst, src)
}
func (m *TransactionOptions) XXX_Size() int {
	return xxx_messageInfo_TransactionOptions.Size(m)
}
func (m *TransactionOptions) XXX_DiscardUnknown() {
	xxx_messageInfo_TransactionOptions.DiscardUnknown(m)
}

var xxx_messageInfo_TransactionOptions proto.InternalMessageInfo

type isTransactionOptions_Mode interface {
	isTransactionOptions_Mode()
}

type TransactionOptions_ReadWrite_ struct {
	ReadWrite *TransactionOptions_ReadWrite `protobuf:"bytes,1,opt,name=read_write,json=readWrite,proto3,oneof"`
}
type TransactionOptions_ReadOnly_ struct {
	ReadOnly *TransactionOptions_ReadOnly `protobuf:"bytes,2,opt,name=read_only,json=readOnly,proto3,oneof"`
}

func (*TransactionOptions_ReadWrite_) isTransactionOptions_Mode() {}
func (*TransactionOptions_ReadOnly_) isTransactionOptions_Mode()  {}

func (m *TransactionOptions) GetMode() isTransactionOptions_Mode {
	if m != nil {
		return m.Mode
	}
	return nil
}

func (m *TransactionOptions) GetReadWrite() *TransactionOptions_ReadWrite {
	if x, ok := m.GetMode().(*TransactionOptions_ReadWrite_); ok {
		return x.ReadWrite
	}
	return nil
}

func (m *TransactionOptions) GetReadOnly() *TransactionOptions_ReadOnly {
	if x, ok := m.GetMode().(*TransactionOptions_ReadOnly_); ok {
		return x.ReadOnly
	}
	return nil
}

// XXX_OneofFuncs is for the internal use of the proto package.
func (*TransactionOptions) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
	return _TransactionOptions_OneofMarshaler, _TransactionOptions_OneofUnmarshaler, _TransactionOptions_OneofSizer, []interface{}{
		(*TransactionOptions_ReadWrite_)(nil),
		(*TransactionOptions_ReadOnly_)(nil),
	}
}

func _TransactionOptions_OneofMarshaler(msg proto.Message, b *proto.Buffer) error {
	m := msg.(*TransactionOptions)
	// mode
	switch x := m.Mode.(type) {
	case *TransactionOptions_ReadWrite_:
		b.EncodeVarint(1<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.ReadWrite); err != nil {
			return err
		}
	case *TransactionOptions_ReadOnly_:
		b.EncodeVarint(2<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.ReadOnly); err != nil {
			return err
		}
	case nil:
	default:
		return fmt.Errorf("TransactionOptions.Mode has unexpected type %T", x)
	}
	return nil
}

func _TransactionOptions_OneofUnmarshaler(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error) {
	m := msg.(*TransactionOptions)
	switch tag {
	case 1: // mode.read_write
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(TransactionOptions_ReadWrite)
		err := b.DecodeMessage(msg)
		m.Mode = &TransactionOptions_ReadWrite_{msg}
		return true, err
	case 2: // mode.read_only
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(TransactionOptions_ReadOnly)
		err := b.DecodeMessage(msg)
		m.Mode = &TransactionOptions_ReadOnly_{msg}
		return true, err
	default:
		return false, nil
	}
}

func _TransactionOptions_OneofSizer(msg proto.Message) (n int) {
	m := msg.(*TransactionOptions)
	// mode
	switch x := m.Mode.(type) {
	case *TransactionOptions_ReadWrite_:
		s := proto.Size(x.ReadWrite)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case *TransactionOptions_ReadOnly_:
		s := proto.Size(x.ReadOnly)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case nil:
	default:
		panic(fmt.Sprintf("proto: unexpected type %T in oneof", x))
	}
	return n
}

// Message type to initiate a read-write transaction. Currently this
// transaction type has no options.
type TransactionOptions_ReadWrite struct {
	XXX_NoUnkeyedLiteral struct{} `json:"-"`
	XXX_unrecognized     []byte   `json:"-"`
	XXX_sizecache        int32    `json:"-"`
}

func (m *TransactionOptions_ReadWrite) Reset()         { *m = TransactionOptions_ReadWrite{} }
func (m *TransactionOptions_ReadWrite) String() string { return proto.CompactTextString(m) }
func (*TransactionOptions_ReadWrite) ProtoMessage()    {}
func (*TransactionOptions_ReadWrite) Descriptor() ([]byte, []int) {
	return fileDescriptor_transaction_ec0699010b3c5244, []int{0, 0}
}
func (m *TransactionOptions_ReadWrite) XXX_Unmarshal(b []byte) error {
	return xxx_messageInfo_TransactionOptions_ReadWrite.Unmarshal(m, b)
}
func (m *TransactionOptions_ReadWrite) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
	return xxx_messageInfo_TransactionOptions_ReadWrite.Marshal(b, m, deterministic)
}
func (dst *TransactionOptions_ReadWrite) XXX_Merge(src proto.Message) {
	xxx_messageInfo_TransactionOptions_ReadWrite.Merge(dst, src)
}
func (m *TransactionOptions_ReadWrite) XXX_Size() int {
	return xxx_messageInfo_TransactionOptions_ReadWrite.Size(m)
}
func (m *TransactionOptions_ReadWrite) XXX_DiscardUnknown() {
	xxx_messageInfo_TransactionOptions_ReadWrite.DiscardUnknown(m)
}

var xxx_messageInfo_TransactionOptions_ReadWrite proto.InternalMessageInfo

// Message type to initiate a read-only transaction.
type TransactionOptions_ReadOnly struct {
	// How to choose the timestamp for the read-only transaction.
	//
	// Types that are valid to be assigned to TimestampBound:
	//	*TransactionOptions_ReadOnly_Strong
	//	*TransactionOptions_ReadOnly_MinReadTimestamp
	//	*TransactionOptions_ReadOnly_MaxStaleness
	//	*TransactionOptions_ReadOnly_ReadTimestamp
	//	*TransactionOptions_ReadOnly_ExactStaleness
	TimestampBound isTransactionOptions_ReadOnly_TimestampBound `protobuf_oneof:"timestamp_bound"`
	// If true, the Cloud Spanner-selected read timestamp is included in
	// the [Transaction][google.spanner.v1.Transaction] message that describes the transaction.
	ReturnReadTimestamp  bool     `protobuf:"varint,6,opt,name=return_read_timestamp,json=returnReadTimestamp,proto3" json:"return_read_timestamp,omitempty"`
	XXX_NoUnkeyedLiteral struct{} `json:"-"`
	XXX_unrecognized     []byte   `json:"-"`
	XXX_sizecache        int32    `json:"-"`
}

func (m *TransactionOptions_ReadOnly) Reset()         { *m = TransactionOptions_ReadOnly{} }
func (m *TransactionOptions_ReadOnly) String() string { return proto.CompactTextString(m) }
func (*TransactionOptions_ReadOnly) ProtoMessage()    {}
func (*TransactionOptions_ReadOnly) Descriptor() ([]byte, []int) {
	return fileDescriptor_transaction_ec0699010b3c5244, []int{0, 1}
}
func (m *TransactionOptions_ReadOnly) XXX_Unmarshal(b []byte) error {
	return xxx_messageInfo_TransactionOptions_ReadOnly.Unmarshal(m, b)
}
func (m *TransactionOptions_ReadOnly) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
	return xxx_messageInfo_TransactionOptions_ReadOnly.Marshal(b, m, deterministic)
}
func (dst *TransactionOptions_ReadOnly) XXX_Merge(src proto.Message) {
	xxx_messageInfo_TransactionOptions_ReadOnly.Merge(dst, src)
}
func (m *TransactionOptions_ReadOnly) XXX_Size() int {
	return xxx_messageInfo_TransactionOptions_ReadOnly.Size(m)
}
func (m *TransactionOptions_ReadOnly) XXX_DiscardUnknown() {
	xxx_messageInfo_TransactionOptions_ReadOnly.DiscardUnknown(m)
}

var xxx_messageInfo_TransactionOptions_ReadOnly proto.InternalMessageInfo

type isTransactionOptions_ReadOnly_TimestampBound interface {
	isTransactionOptions_ReadOnly_TimestampBound()
}

type TransactionOptions_ReadOnly_Strong struct {
	Strong bool `protobuf:"varint,1,opt,name=strong,proto3,oneof"`
}
type TransactionOptions_ReadOnly_MinReadTimestamp struct {
	MinReadTimestamp *timestamp.Timestamp `protobuf:"bytes,2,opt,name=min_read_timestamp,json=minReadTimestamp,proto3,oneof"`
}
type TransactionOptions_ReadOnly_MaxStaleness struct {
	MaxStaleness *duration.Duration `protobuf:"bytes,3,opt,name=max_staleness,json=maxStaleness,proto3,oneof"`
}
type TransactionOptions_ReadOnly_ReadTimestamp struct {
	ReadTimestamp *timestamp.Timestamp `protobuf:"bytes,4,opt,name=read_timestamp,json=readTimestamp,proto3,oneof"`
}
type TransactionOptions_ReadOnly_ExactStaleness struct {
	ExactStaleness *duration.Duration `protobuf:"bytes,5,opt,name=exact_staleness,json=exactStaleness,proto3,oneof"`
}

func (*TransactionOptions_ReadOnly_Strong) isTransactionOptions_ReadOnly_TimestampBound()           {}
func (*TransactionOptions_ReadOnly_MinReadTimestamp) isTransactionOptions_ReadOnly_TimestampBound() {}
func (*TransactionOptions_ReadOnly_MaxStaleness) isTransactionOptions_ReadOnly_TimestampBound()     {}
func (*TransactionOptions_ReadOnly_ReadTimestamp) isTransactionOptions_ReadOnly_TimestampBound()    {}
func (*TransactionOptions_ReadOnly_ExactStaleness) isTransactionOptions_ReadOnly_TimestampBound()   {}

func (m *TransactionOptions_ReadOnly) GetTimestampBound() isTransactionOptions_ReadOnly_TimestampBound {
	if m != nil {
		return m.TimestampBound
	}
	return nil
}

func (m *TransactionOptions_ReadOnly) GetStrong() bool {
	if x, ok := m.GetTimestampBound().(*TransactionOptions_ReadOnly_Strong); ok {
		return x.Strong
	}
	return false
}

func (m *TransactionOptions_ReadOnly) GetMinReadTimestamp() *timestamp.Timestamp {
	if x, ok := m.GetTimestampBound().(*TransactionOptions_ReadOnly_MinReadTimestamp); ok {
		return x.MinReadTimestamp
	}
	return nil
}

func (m *TransactionOptions_ReadOnly) GetMaxStaleness() *duration.Duration {
	if x, ok := m.GetTimestampBound().(*TransactionOptions_ReadOnly_MaxStaleness); ok {
		return x.MaxStaleness
	}
	return nil
}

func (m *TransactionOptions_ReadOnly) GetReadTimestamp() *timestamp.Timestamp {
	if x, ok := m.GetTimestampBound().(*TransactionOptions_ReadOnly_ReadTimestamp); ok {
		return x.ReadTimestamp
	}
	return nil
}

func (m *TransactionOptions_ReadOnly) GetExactStaleness() *duration.Duration {
	if x, ok := m.GetTimestampBound().(*TransactionOptions_ReadOnly_ExactStaleness); ok {
		return x.ExactStaleness
	}
	return nil
}

func (m *TransactionOptions_ReadOnly) GetReturnReadTimestamp() bool {
	if m != nil {
		return m.ReturnReadTimestamp
	}
	return false
}

// XXX_OneofFuncs is for the internal use of the proto package.
func (*TransactionOptions_ReadOnly) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
	return _TransactionOptions_ReadOnly_OneofMarshaler, _TransactionOptions_ReadOnly_OneofUnmarshaler, _TransactionOptions_ReadOnly_OneofSizer, []interface{}{
		(*TransactionOptions_ReadOnly_Strong)(nil),
		(*TransactionOptions_ReadOnly_MinReadTimestamp)(nil),
		(*TransactionOptions_ReadOnly_MaxStaleness)(nil),
		(*TransactionOptions_ReadOnly_ReadTimestamp)(nil),
		(*TransactionOptions_ReadOnly_ExactStaleness)(nil),
	}
}

func _TransactionOptions_ReadOnly_OneofMarshaler(msg proto.Message, b *proto.Buffer) error {
	m := msg.(*TransactionOptions_ReadOnly)
	// timestamp_bound
	switch x := m.TimestampBound.(type) {
	case *TransactionOptions_ReadOnly_Strong:
		t := uint64(0)
		if x.Strong {
			t = 1
		}
		b.EncodeVarint(1<<3 | proto.WireVarint)
		b.EncodeVarint(t)
	case *TransactionOptions_ReadOnly_MinReadTimestamp:
		b.EncodeVarint(2<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.MinReadTimestamp); err != nil {
			return err
		}
	case *TransactionOptions_ReadOnly_MaxStaleness:
		b.EncodeVarint(3<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.MaxStaleness); err != nil {
			return err
		}
	case *TransactionOptions_ReadOnly_ReadTimestamp:
		b.EncodeVarint(4<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.ReadTimestamp); err != nil {
			return err
		}
	case *TransactionOptions_ReadOnly_ExactStaleness:
		b.EncodeVarint(5<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.ExactStaleness); err != nil {
			return err
		}
	case nil:
	default:
		return fmt.Errorf("TransactionOptions_ReadOnly.TimestampBound has unexpected type %T", x)
	}
	return nil
}

func _TransactionOptions_ReadOnly_OneofUnmarshaler(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error) {
	m := msg.(*TransactionOptions_ReadOnly)
	switch tag {
	case 1: // timestamp_bound.strong
		if wire != proto.WireVarint {
			return true, proto.ErrInternalBadWireType
		}
		x, err := b.DecodeVarint()
		m.TimestampBound = &TransactionOptions_ReadOnly_Strong{x != 0}
		return true, err
	case 2: // timestamp_bound.min_read_timestamp
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(timestamp.Timestamp)
		err := b.DecodeMessage(msg)
		m.TimestampBound = &TransactionOptions_ReadOnly_MinReadTimestamp{msg}
		return true, err
	case 3: // timestamp_bound.max_staleness
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(duration.Duration)
		err := b.DecodeMessage(msg)
		m.TimestampBound = &TransactionOptions_ReadOnly_MaxStaleness{msg}
		return true, err
	case 4: // timestamp_bound.read_timestamp
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(timestamp.Timestamp)
		err := b.DecodeMessage(msg)
		m.TimestampBound = &TransactionOptions_ReadOnly_ReadTimestamp{msg}
		return true, err
	case 5: // timestamp_bound.exact_staleness
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(duration.Duration)
		err := b.DecodeMessage(msg)
		m.TimestampBound = &TransactionOptions_ReadOnly_ExactStaleness{msg}
		return true, err
	default:
		return false, nil
	}
}

func _TransactionOptions_ReadOnly_OneofSizer(msg proto.Message) (n int) {
	m := msg.(*TransactionOptions_ReadOnly)
	// timestamp_bound
	switch x := m.TimestampBound.(type) {
	case *TransactionOptions_ReadOnly_Strong:
		n += 1 // tag and wire
		n += 1
	case *TransactionOptions_ReadOnly_MinReadTimestamp:
		s := proto.Size(x.MinReadTimestamp)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case *TransactionOptions_ReadOnly_MaxStaleness:
		s := proto.Size(x.MaxStaleness)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case *TransactionOptions_ReadOnly_ReadTimestamp:
		s := proto.Size(x.ReadTimestamp)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case *TransactionOptions_ReadOnly_ExactStaleness:
		s := proto.Size(x.ExactStaleness)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case nil:
	default:
		panic(fmt.Sprintf("proto: unexpected type %T in oneof", x))
	}
	return n
}

// A transaction.
type Transaction struct {
	// `id` may be used to identify the transaction in subsequent
	// [Read][google.spanner.v1.Spanner.Read],
	// [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql],
	// [Commit][google.spanner.v1.Spanner.Commit], or
	// [Rollback][google.spanner.v1.Spanner.Rollback] calls.
	//
	// Single-use read-only transactions do not have IDs, because
	// single-use transactions do not support multiple requests.
	Id []byte `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
	// For snapshot read-only transactions, the read timestamp chosen
	// for the transaction. Not returned by default: see
	// [TransactionOptions.ReadOnly.return_read_timestamp][google.spanner.v1.TransactionOptions.ReadOnly.return_read_timestamp].
	//
	// A timestamp in RFC3339 UTC \"Zulu\" format, accurate to nanoseconds.
	// Example: `"2014-10-02T15:01:23.045123456Z"`.
	ReadTimestamp        *timestamp.Timestamp `protobuf:"bytes,2,opt,name=read_timestamp,json=readTimestamp,proto3" json:"read_timestamp,omitempty"`
	XXX_NoUnkeyedLiteral struct{}             `json:"-"`
	XXX_unrecognized     []byte               `json:"-"`
	XXX_sizecache        int32                `json:"-"`
}

func (m *Transaction) Reset()         { *m = Transaction{} }
func (m *Transaction) String() string { return proto.CompactTextString(m) }
func (*Transaction) ProtoMessage()    {}
func (*Transaction) Descriptor() ([]byte, []int) {
	return fileDescriptor_transaction_ec0699010b3c5244, []int{1}
}
func (m *Transaction) XXX_Unmarshal(b []byte) error {
	return xxx_messageInfo_Transaction.Unmarshal(m, b)
}
func (m *Transaction) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
	return xxx_messageInfo_Transaction.Marshal(b, m, deterministic)
}
func (dst *Transaction) XXX_Merge(src proto.Message) {
	xxx_messageInfo_Transaction.Merge(dst, src)
}
func (m *Transaction) XXX_Size() int {
	return xxx_messageInfo_Transaction.Size(m)
}
func (m *Transaction) XXX_DiscardUnknown() {
	xxx_messageInfo_Transaction.DiscardUnknown(m)
}

var xxx_messageInfo_Transaction proto.InternalMessageInfo

func (m *Transaction) GetId() []byte {
	if m != nil {
		return m.Id
	}
	return nil
}

func (m *Transaction) GetReadTimestamp() *timestamp.Timestamp {
	if m != nil {
		return m.ReadTimestamp
	}
	return nil
}

// This message is used to select the transaction in which a
// [Read][google.spanner.v1.Spanner.Read] or
// [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] call runs.
//
// See [TransactionOptions][google.spanner.v1.TransactionOptions] for more information about transactions.
type TransactionSelector struct {
	// If no fields are set, the default is a single use transaction
	// with strong concurrency.
	//
	// Types that are valid to be assigned to Selector:
	//	*TransactionSelector_SingleUse
	//	*TransactionSelector_Id
	//	*TransactionSelector_Begin
	Selector             isTransactionSelector_Selector `protobuf_oneof:"selector"`
	XXX_NoUnkeyedLiteral struct{}                       `json:"-"`
	XXX_unrecognized     []byte                         `json:"-"`
	XXX_sizecache        int32                          `json:"-"`
}

func (m *TransactionSelector) Reset()         { *m = TransactionSelector{} }
func (m *TransactionSelector) String() string { return proto.CompactTextString(m) }
func (*TransactionSelector) ProtoMessage()    {}
func (*TransactionSelector) Descriptor() ([]byte, []int) {
	return fileDescriptor_transaction_ec0699010b3c5244, []int{2}
}
func (m *TransactionSelector) XXX_Unmarshal(b []byte) error {
	return xxx_messageInfo_TransactionSelector.Unmarshal(m, b)
}
func (m *TransactionSelector) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
	return xxx_messageInfo_TransactionSelector.Marshal(b, m, deterministic)
}
func (dst *TransactionSelector) XXX_Merge(src proto.Message) {
	xxx_messageInfo_TransactionSelector.Merge(dst, src)
}
func (m *TransactionSelector) XXX_Size() int {
	return xxx_messageInfo_TransactionSelector.Size(m)
}
func (m *TransactionSelector) XXX_DiscardUnknown() {
	xxx_messageInfo_TransactionSelector.DiscardUnknown(m)
}

var xxx_messageInfo_TransactionSelector proto.InternalMessageInfo

type isTransactionSelector_Selector interface {
	isTransactionSelector_Selector()
}

type TransactionSelector_SingleUse struct {
	SingleUse *TransactionOptions `protobuf:"bytes,1,opt,name=single_use,json=singleUse,proto3,oneof"`
}
type TransactionSelector_Id struct {
	Id []byte `protobuf:"bytes,2,opt,name=id,proto3,oneof"`
}
type TransactionSelector_Begin struct {
	Begin *TransactionOptions `protobuf:"bytes,3,opt,name=begin,proto3,oneof"`
}

func (*TransactionSelector_SingleUse) isTransactionSelector_Selector() {}
func (*TransactionSelector_Id) isTransactionSelector_Selector()        {}
func (*TransactionSelector_Begin) isTransactionSelector_Selector()     {}

func (m *TransactionSelector) GetSelector() isTransactionSelector_Selector {
	if m != nil {
		return m.Selector
	}
	return nil
}

func (m *TransactionSelector) GetSingleUse() *TransactionOptions {
	if x, ok := m.GetSelector().(*TransactionSelector_SingleUse); ok {
		return x.SingleUse
	}
	return nil
}

func (m *TransactionSelector) GetId() []byte {
	if x, ok := m.GetSelector().(*TransactionSelector_Id); ok {
		return x.Id
	}
	return nil
}

func (m *TransactionSelector) GetBegin() *TransactionOptions {
	if x, ok := m.GetSelector().(*TransactionSelector_Begin); ok {
		return x.Begin
	}
	return nil
}

// XXX_OneofFuncs is for the internal use of the proto package.
func (*TransactionSelector) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
	return _TransactionSelector_OneofMarshaler, _TransactionSelector_OneofUnmarshaler, _TransactionSelector_OneofSizer, []interface{}{
		(*TransactionSelector_SingleUse)(nil),
		(*TransactionSelector_Id)(nil),
		(*TransactionSelector_Begin)(nil),
	}
}

func _TransactionSelector_OneofMarshaler(msg proto.Message, b *proto.Buffer) error {
	m := msg.(*TransactionSelector)
	// selector
	switch x := m.Selector.(type) {
	case *TransactionSelector_SingleUse:
		b.EncodeVarint(1<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.SingleUse); err != nil {
			return err
		}
	case *TransactionSelector_Id:
		b.EncodeVarint(2<<3 | proto.WireBytes)
		b.EncodeRawBytes(x.Id)
	case *TransactionSelector_Begin:
		b.EncodeVarint(3<<3 | proto.WireBytes)
		if err := b.EncodeMessage(x.Begin); err != nil {
			return err
		}
	case nil:
	default:
		return fmt.Errorf("TransactionSelector.Selector has unexpected type %T", x)
	}
	return nil
}

func _TransactionSelector_OneofUnmarshaler(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error) {
	m := msg.(*TransactionSelector)
	switch tag {
	case 1: // selector.single_use
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(TransactionOptions)
		err := b.DecodeMessage(msg)
		m.Selector = &TransactionSelector_SingleUse{msg}
		return true, err
	case 2: // selector.id
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		x, err := b.DecodeRawBytes(true)
		m.Selector = &TransactionSelector_Id{x}
		return true, err
	case 3: // selector.begin
		if wire != proto.WireBytes {
			return true, proto.ErrInternalBadWireType
		}
		msg := new(TransactionOptions)
		err := b.DecodeMessage(msg)
		m.Selector = &TransactionSelector_Begin{msg}
		return true, err
	default:
		return false, nil
	}
}

func _TransactionSelector_OneofSizer(msg proto.Message) (n int) {
	m := msg.(*TransactionSelector)
	// selector
	switch x := m.Selector.(type) {
	case *TransactionSelector_SingleUse:
		s := proto.Size(x.SingleUse)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case *TransactionSelector_Id:
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(len(x.Id)))
		n += len(x.Id)
	case *TransactionSelector_Begin:
		s := proto.Size(x.Begin)
		n += 1 // tag and wire
		n += proto.SizeVarint(uint64(s))
		n += s
	case nil:
	default:
		panic(fmt.Sprintf("proto: unexpected type %T in oneof", x))
	}
	return n
}

func init() {
	proto.RegisterType((*TransactionOptions)(nil), "google.spanner.v1.TransactionOptions")
	proto.RegisterType((*TransactionOptions_ReadWrite)(nil), "google.spanner.v1.TransactionOptions.ReadWrite")
	proto.RegisterType((*TransactionOptions_ReadOnly)(nil), "google.spanner.v1.TransactionOptions.ReadOnly")
	proto.RegisterType((*Transaction)(nil), "google.spanner.v1.Transaction")
	proto.RegisterType((*TransactionSelector)(nil), "google.spanner.v1.TransactionSelector")
}

func init() {
	proto.RegisterFile("google/spanner/v1/transaction.proto", fileDescriptor_transaction_ec0699010b3c5244)
}

var fileDescriptor_transaction_ec0699010b3c5244 = []byte{
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