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Contents
# Copyright (C) 2014-2015 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
module Mongo
module Operation
# Adds behaviour for updating the options and the selector for operations
# that need to take read preference into account.
#
# @since 2.0.0
module ReadPreference
# The constant for slave ok flags.
#
# @since 2.0.6
SLAVE_OK = :slave_ok
private
def update_selector(context)
if context.mongos? && read_pref = read.to_mongos
sel = selector[:$query] ? selector : { :$query => selector }
sel.merge(:$readPreference => read_pref)
else
selector
end
end
def slave_ok?(context)
(context.cluster.single? && !context.mongos?) || read.slave_ok?
end
def update_options(context)
if slave_ok?(context)
options.dup.tap do |opts|
(opts[:flags] ||= []) << SLAVE_OK
end
else
options
end
end
def message(context)
sel = update_selector(context)
opts = update_options(context)
Protocol::Query.new(db_name, query_coll, sel, opts)
end
end
end
end
Version data entries
16 entries across 15 versions & 3 rubygems