Class: Legion::Transport::Helpers::Pool

Inherits:
Object
  • Object
show all
Includes:
Logging::Helper
Defined in:
lib/legion/transport/helpers/pool.rb

Instance Method Summary collapse

Constructor Details

#initialize(size: 1, timeout: 5, &block) ⇒ Pool

Returns a new instance of Pool.



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# File 'lib/legion/transport/helpers/pool.rb', line 11

def initialize(size: 1, timeout: 5, &block)
  @size        = size
  @timeout     = timeout
  @factory     = block
  @available   = []
  @in_use      = []
  @mutex       = Mutex.new
  @condition   = ConditionVariable.new
end

Instance Method Details

#checkin(connection) ⇒ Object 



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# File 'lib/legion/transport/helpers/pool.rb', line 53

def checkin(connection)
  @mutex.synchronize do
    @in_use.delete(connection)
    @available << connection if connection.respond_to?(:open?) && connection.open?
    log.debug "Pool checkin (available=#{@available.size} in_use=#{@in_use.size})"
    @condition.signal
  end
end

#checkout ⇒ Object 



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# File 'lib/legion/transport/helpers/pool.rb', line 21

def checkout
  deadline = Time.now + @timeout

  @mutex.synchronize do
    loop do
      @available.reject! { |c| c.respond_to?(:closed?) && c.closed? }

      if (conn = @available.pop)
        @in_use << conn
        log.debug "Pool checkout (available=#{@available.size} in_use=#{@in_use.size})"
        return conn
      end

      total = @available.size + @in_use.size
      if total < @size
        conn = @factory.call
        @in_use << conn
        log.debug "Pool checkout new connection (available=#{@available.size} in_use=#{@in_use.size})"
        return conn
      end

      remaining = deadline - Time.now
      if remaining <= 0
        log.warn "Pool timeout after #{@timeout}s (size=#{@size} in_use=#{@in_use.size})"
        raise Legion::Transport::PoolTimeout, 'timed out waiting for available connection'
      end

      @condition.wait(@mutex, remaining)
    end
  end
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/transport/helpers/pool.rb', line 79

def connected?
  @mutex.synchronize do
    (@available + @in_use).any? { |c| c.respond_to?(:open?) && c.open? }
  end
end

#shutdown ⇒ Object 



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# File 'lib/legion/transport/helpers/pool.rb', line 66

def shutdown
  @mutex.synchronize do
    (@available + @in_use).each do |conn|
      conn.close
    rescue StandardError => e
      handle_exception(e, level: :warn, handled: true, operation: 'transport.pool.shutdown', size: @size)
    end
    @available.clear
    @in_use.clear
  end
  log.info "Pool shutdown complete size=#{@size}"
end

#size ⇒ Object 



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# File 'lib/legion/transport/helpers/pool.rb', line 62

def size
  @mutex.synchronize { @available.size + @in_use.size }
end