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# Copyright (C) 2017 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
class Session
# A pool of server sessions.
#
# @api private
#
# @since 2.5.0
class SessionPool
# Create a SessionPool.
#
# @example
# SessionPool.create(cluster)
#
# @param [ Mongo::Cluster ] cluster The cluster that will be associated with this
# session pool.
#
# @since 2.5.0
def self.create(cluster)
pool = new(cluster)
cluster.instance_variable_set(:@session_pool, pool)
end
# Initialize a SessionPool.
#
# @example
# SessionPool.new(cluster)
#
# @param [ Mongo::Cluster ] cluster The cluster that will be associated with this
# session pool.
#
# @since 2.5.0
def initialize(cluster)
@queue = []
@mutex = Mutex.new
@cluster = cluster
end
# Get a formatted string for use in inspection.
#
# @example Inspect the session pool object.
# session_pool.inspect
#
# @return [ String ] The session pool inspection.
#
# @since 2.5.0
def inspect
"#<Mongo::Session::SessionPool:0x#{object_id} current_size=#{@queue.size}>"
end
# Checkout a server session from the pool.
#
# @example Checkout a session.
# pool.checkout
#
# @return [ ServerSession ] The server session.
#
# @since 2.5.0
def checkout
@mutex.synchronize do
loop do
if @queue.empty?
return ServerSession.new
else
session = @queue.shift
unless about_to_expire?(session)
return session
end
end
end
end
end
# Checkin a server session to the pool.
#
# @example Checkin a session.
# pool.checkin(session)
#
# @param [ Session::ServerSession ] session The session to checkin.
#
# @since 2.5.0
def checkin(session)
@mutex.synchronize do
prune!
unless about_to_expire?(session)
@queue.unshift(session)
end
end
end
# End all sessions in the pool by sending the endSessions command to the server.
#
# @example End all sessions.
# pool.end_sessions
#
# @since 2.5.0
def end_sessions
while !@queue.empty?
server = ServerSelector.get(mode: :primary_preferred).select_server(@cluster)
Operation::Commands::Command.new(
:selector => {endSessions: @queue.shift(10_000).collect { |s| s.session_id }},
:db_name => Database::ADMIN).execute(server)
end
rescue
end
private
def about_to_expire?(session)
if @cluster.logical_session_timeout
idle_time_minutes = (Time.now - session.last_use) / 60
(idle_time_minutes + 1) >= @cluster.logical_session_timeout
end
end
def prune!
while !@queue.empty?
if about_to_expire?(@queue[-1])
@queue.pop
else
break
end
end
end
end
end
end
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