Class: Stillwater::ConnectionPool

Inherits:
Object
  • Object
show all
Defined in:
lib/stillwater/connection_pool.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ConnectionPool

Returns a new instance of ConnectionPool.



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# File 'lib/stillwater/connection_pool.rb', line 7

def initialize
  @pool = []
  @reactivate_timeout = 5 * 60 # 5 minutes
  @retry_count = 3
  @polling = false
end

Instance Attribute Details

#reactivate_timeout ⇒ Object

Returns the value of attribute reactivate_timeout.



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# File 'lib/stillwater/connection_pool.rb', line 5

def reactivate_timeout
  @reactivate_timeout
end

#retry_count ⇒ Object

Returns the value of attribute retry_count.



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# File 'lib/stillwater/connection_pool.rb', line 5

def retry_count
  @retry_count
end

Instance Method Details

#add(&builder) ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 14

def add(&builder)
  @pool << connection_info_from(builder)
end

#available_count ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 80

def available_count
  available.size
end

#checkin(conn) ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 55

def checkin(conn)
  connection_info = in_use.detect { |info| info[:connection] == conn }
  connection_info[:state] = :available unless connection_info.nil?

  true
end

#checkout ⇒ Object

Raises:



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# File 'lib/stillwater/connection_pool.rb', line 46

def checkout
  reactivate_all if poll_timeout_exceeded?
  connection_info = available.respond_to?(:sample) ? available.sample : available.choice
  raise ConnectionNotAvailable if connection_info.nil?
  connection_info[:state] = :in_use

  connection_info[:connection]
end

#deactivate(conn) ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 62

def deactivate(conn)
  connection_info = @pool.detect { |info| info[:connection] == conn }
  connection_info[:connection] = nil
  connection_info[:state] = :inactive

  start_polling
  true
end

#in_use_count ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 88

def in_use_count
  in_use.size
end

#inactive_count ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 84

def inactive_count
  inactive.size
end

#reactivate_all ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 71

def reactivate_all
  inactive.each do |info|
    info[:connection] = info[:builder].call
    info[:state] = :available
  end

  true
end

#retry_connection_from(exception_class, &block) ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 31

def retry_connection_from(exception_class, &block)
  count = 0
  begin
    conn  = checkout
    yield conn
  rescue exception_class
    raise if count >= @retry_count
    deactivate conn
    count += 1
    retry
  ensure
    checkin conn
  end
end

#with_connection(&block) ⇒ Object 



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# File 'lib/stillwater/connection_pool.rb', line 23

def with_connection(&block)
  conn = checkout
  result = yield conn
  checkin conn

  result
end