storages::mongo::options::ReadPreference Class Reference

Table of Contents

• Public Types
• Public Member Functions
• Detailed Description
• Member Enumeration Documentation
• Mode
• Member Function Documentation
• AddTag()
• SetMaxStaleness()

Read preference. More...

#include <userver/storages/mongo/options.hpp>

Public Types
enum	Mode {   kPrimary ,   kSecondary ,   kPrimaryPreferred ,   kSecondaryPreferred ,   kNearest }

Public Member Functions
	ReadPreference (Mode mode)
	ReadPreference (Mode mode, std::vector< formats::bson::Document > tags)
Mode	GetMode () const
std::optional< std::chrono::seconds >	GetMaxStaleness () const
const std::vector< formats::bson::Document > &	GetTags () const
ReadPreference &	SetMaxStaleness (std::optional< std::chrono::seconds > max_staleness)
	Sets maximum replication lag for eligible replica.
ReadPreference &	AddTag (formats::bson::Document tag)
	Adds a tag to the tag set.

Detailed Description

Read preference.

See also

https://docs.mongodb.com/manual/reference/read-preference/

Definition at line 27 of file options.hpp.

Member Enumeration Documentation

Mode

enum storages::mongo::options::ReadPreference::Mode

Enumerator
kPrimary	read from primary, default mode
kSecondary	read from secondary
kPrimaryPreferred	read from primary if available, fallback to secondary
kSecondaryPreferred	read from secondary if available, fallback to primary
kNearest	read from any host with the lowest latency

Definition at line 29 of file options.hpp.

Member Function Documentation

AddTag()

ReadPreference & storages::mongo::options::ReadPreference::AddTag

(

formats::bson::Document

tag

)

Adds a tag to the tag set.

Note

Cannot be used with kPrimary mode.

SetMaxStaleness()

ReadPreference & storages::mongo::options::ReadPreference::SetMaxStaleness

(

std::optional< std::chrono::seconds >

max_staleness

)

Sets maximum replication lag for eligible replica.

Note

Must be at least 90 seconds, cannot be used with kPrimary mode.

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The documentation for this class was generated from the following file:

• userver/storages/mongo/options.hpp