discourse/lib/freedom_patches/pool_drainer.rb

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if Rails.version >= "4.2.0"
class ActiveRecord::ConnectionAdapters::AbstractAdapter
module LastUseExtension
attr_reader :last_use, :first_use
def initialize(connection, logger = nil, pool = nil)
super
@last_use = false
@first_use = Time.now
end
def lease
@lock.synchronize do
unless in_use?
@last_use = Time.now
super
end
end
end
end
prepend LastUseExtension
end
end
class ActiveRecord::ConnectionAdapters::ConnectionPool
# drain all idle connections
# if idle_time is specified only connections idle for N seconds will be drained
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def drain(idle_time = nil, max_age = nil)
synchronize do
@available.clear
@connections.delete_if do |conn|
try_drain?(conn, idle_time, max_age)
end
@connections.each do |conn|
@available.add conn if !conn.in_use?
end
end
end
private
def try_drain?(conn, idle_time, max_age)
if !conn.in_use?
if !idle_time || conn.last_use < idle_time.seconds.ago || (max_age && conn.first_use < max_age.seconds.ago)
conn.disconnect!
return true
end
end
false
end
end