class Mongo::ServerSelector::Nearest
Encapsulates specifications for selecting near servers given a list
of candidates.
@since 2.0.0
Constants
- SERVER_FORMATTED_NAME
Name of the this read preference in the server’s format.
@since 2.5.0
Public Instance Methods
Whether the hedge option is allowed to be defined for this server preference.
@return [ true ] true
# File lib/mongo/server_selector/nearest.rb, line 65 def hedge_allowed? true end
Get the name of the server mode type.
@example Get the name of the server mode for this preference.
preference.name
@return [ Symbol
] :nearest
@since 2.0.0
# File lib/mongo/server_selector/nearest.rb, line 40 def name :nearest end
Whether the secondaryOk bit should be set on wire protocol messages.
I.e. whether the operation can be performed on a secondary server.
@return [ true ] true @api private
# File lib/mongo/server_selector/nearest.rb, line 49 def secondary_ok? true end
Convert this server preference definition into a format appropriate
for sending to a MongoDB server (i.e., as a command field).
@return [ Hash ] The server preference formatted as a command field value.
@since 2.0.0
# File lib/mongo/server_selector/nearest.rb, line 75 def to_doc full_doc end
Convert this server preference definition into a value appropriate
for sending to a mongos.
This method may return nil if the read preference should not be sent to a mongos.
@return [ Hash | nil ] The server preference converted to a mongos
command field value.
@since 2.0.0
Private Instance Methods
# File lib/mongo/server_selector/nearest.rb, line 105 def max_staleness_allowed? true end
Select the near servers taking into account any defined tag sets and
local threshold between the nearest server and other servers.
@return [ Array ] The nearest servers from the list of candidates.
@since 2.0.0
# File lib/mongo/server_selector/nearest.rb, line 99 def select_in_replica_set(candidates) matching_servers = filter_stale_servers(candidates, primary(candidates).first) matching_servers = match_tag_sets(matching_servers) unless tag_sets.empty? near_servers(matching_servers) end