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95 lines
2.1 KiB
95 lines
2.1 KiB
# frozen_string_literal: true
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class ConnectionPool::SharedTimedStack
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def initialize(max = 0, &block)
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@create_block = block
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@max = max
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@created = 0
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@queue = []
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@tagged_queue = Hash.new { |hash, key| hash[key] = [] }
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@mutex = Mutex.new
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@resource = ConditionVariable.new
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end
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def push(connection)
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@mutex.synchronize do
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store_connection(connection)
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@resource.broadcast
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end
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end
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alias << push
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def pop(preferred_tag, timeout = 5.0)
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deadline = current_time + timeout
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@mutex.synchronize do
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loop do
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return fetch_preferred_connection(preferred_tag) unless @tagged_queue[preferred_tag].empty?
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connection = try_create(preferred_tag)
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return connection if connection
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to_wait = deadline - current_time
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raise Timeout::Error, "Waited #{timeout} sec" if to_wait <= 0
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@resource.wait(@mutex, to_wait)
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end
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end
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end
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def empty?
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size.zero?
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end
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def size
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@mutex.synchronize do
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@queue.size
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end
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end
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def flush
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@mutex.synchronize do
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@queue.delete_if do |connection|
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delete = !connection.in_use && (connection.dead || connection.seconds_idle >= RequestPool::MAX_IDLE_TIME)
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if delete
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@tagged_queue[connection.site].delete(connection)
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connection.close
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@created -= 1
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end
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delete
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end
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end
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end
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private
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def try_create(preferred_tag)
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if @created == @max && !@queue.empty?
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throw_away_connection = @queue.pop
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@tagged_queue[throw_away_connection.site].delete(throw_away_connection)
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@create_block.call(preferred_tag)
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elsif @created != @max
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connection = @create_block.call(preferred_tag)
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@created += 1
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connection
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end
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end
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def fetch_preferred_connection(preferred_tag)
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connection = @tagged_queue[preferred_tag].pop
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@queue.delete(connection)
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connection
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end
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def current_time
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Process.clock_gettime(Process::CLOCK_MONOTONIC)
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end
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def store_connection(connection)
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@tagged_queue[connection.site].push(connection)
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@queue.push(connection)
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end
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end
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