98 lines
2.5 KiB
Ruby
98 lines
2.5 KiB
Ruby
raise "Remove no-longer-needed #{__FILE__}!" if Rails::VERSION::MAJOR >= 6
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require "weakref"
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module ActiveRecord
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# Backport https://github.com/rails/rails/pull/36998 and https://github.com/rails/rails/pull/36999
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# to avoid `ThreadError: can't create Thread: Resource temporarily unavailable` issues
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module ConnectionAdapters
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class ConnectionPool
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class Reaper
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@mutex = Mutex.new
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@pools = {}
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@threads = {}
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class << self
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def register_pool(pool, frequency) # :nodoc:
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@mutex.synchronize do
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unless @threads[frequency]&.alive?
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@threads[frequency] = spawn_thread(frequency)
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end
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@pools[frequency] ||= []
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@pools[frequency] << WeakRef.new(pool)
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end
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end
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private
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def spawn_thread(frequency)
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Thread.new(frequency) do |t|
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running = true
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while running
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sleep t
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@mutex.synchronize do
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@pools[frequency].select!(&:weakref_alive?)
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@pools[frequency].each do |p|
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p.reap
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p.flush
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rescue WeakRef::RefError
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end
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if @pools[frequency].empty?
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@pools.delete(frequency)
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@threads.delete(frequency)
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running = false
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end
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end
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end
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end
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end
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end
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def run
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return unless frequency && frequency > 0
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self.class.register_pool(pool, frequency)
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end
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end
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def reap
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stale_connections = synchronize do
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return unless @connections
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@connections.select do |conn|
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conn.in_use? && !conn.owner.alive?
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end.each(&:steal!)
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end
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stale_connections.each do |conn|
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if conn.active?
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conn.reset!
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checkin conn
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else
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remove conn
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end
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end
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end
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def flush(minimum_idle = @idle_timeout)
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return if minimum_idle.nil?
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idle_connections = synchronize do
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return unless @connections
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@connections.select do |conn|
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!conn.in_use? && conn.seconds_idle >= minimum_idle
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end.each do |conn|
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conn.lease
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@available.delete conn
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@connections.delete conn
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end
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end
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idle_connections.each(&:disconnect!)
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end
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end
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end
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end
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