writeconcern

Documentation

Index

• Variables
• func AckWrite(wc *WriteConcern) bool
• func AcknowledgedElement(elem *bson.Element) bool
• type Option
  • func J(j bool) Option
  • func W(w int) Option
  • func WMajority() Option
  • func WTagSet(tag string) Option
  • func WTimeout(d time.Duration) Option
• type WriteConcern
  • func New(options ...Option) *WriteConcern
  • func (wc *WriteConcern) Acknowledged() bool
  • func (wc *WriteConcern) IsValid() bool
  • func (wc *WriteConcern) MarshalBSONElement() (*bson.Element, error)

Variables

var ErrInconsistent = errors.New("a write concern cannot have both w=0 and j=true")

ErrInconsistent indicates that an inconsistent write concern was specified.

var ErrNegativeW = errors.New("write concern `w` field cannot be a negative number")

ErrNegativeW indicates that a negative integer `w` field was specified.

var ErrNegativeWTimeout = errors.New("write concern `wtimeout` field cannot be negative")

ErrNegativeWTimeout indicates that a negative WTimeout was specified.

Functions

func AckWrite

func AckWrite(wc *WriteConcern) bool

AckWrite returns true if a write concern represents an acknowledged write

func AcknowledgedElement

func AcknowledgedElement(elem *bson.Element) bool

AcknowledgedElement returns true if a BSON element for a write concern represents an acknowledged write concern. The element's value must be a document representing a write concern.

Types

type Option

type Option func(concern *WriteConcern)

Option is an option to provide when creating a ReadConcern.

func J

func J(j bool) Option

J requests acknowledgement from MongoDB that write operations are written to the journal.

func W

func W(w int) Option

W requests acknowledgement that write operations propagate to the specified number of mongod instances.

func WMajority

func WMajority() Option

WMajority requests acknowledgement that write operations propagate to the majority of mongod instances.

func WTagSet

func WTagSet(tag string) Option

WTagSet requests acknowledgement that write operations propagate to the specified mongod instance.

func WTimeout

func WTimeout(d time.Duration) Option

WTimeout specifies specifies a time limit for the write concern.

type WriteConcern

type WriteConcern struct {
	// contains filtered or unexported fields
}

WriteConcern describes the level of acknowledgement requested from MongoDB for write operations to a standalone mongod or to replica sets or to sharded clusters.

func New

func New(options ...Option) *WriteConcern

New constructs a new WriteConcern.

func (*WriteConcern) Acknowledged

func (wc *WriteConcern) Acknowledged() bool

Acknowledged indicates whether or not a write with the given write concern will be acknowledged.

func (*WriteConcern) IsValid

func (wc *WriteConcern) IsValid() bool

IsValid checks whether the write concern is invalid.

func (*WriteConcern) MarshalBSONElement

func (wc *WriteConcern) MarshalBSONElement() (*bson.Element, error)

MarshalBSONElement marshals the write concern into a *bson.Element.