Class: ConnectionPool::TimedStack

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

Instance Method Summary collapse

Constructor Details

#initialize(size = 0, &block) ⇒ TimedStack

Returns a new instance of TimedStack.



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# File 'lib/connection_pool/timed_stack.rb', line 8

def initialize(size = 0, &block)
  @create_block = block
  @created = 0
  @que = []
  @max = size
  @mutex = Mutex.new
  @resource = ConditionVariable.new
  @shutdown_block = nil
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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

def empty?
  (@created - @que.length) >= @max
end

#length ⇒ Object 



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# File 'lib/connection_pool/timed_stack.rb', line 66

def length
  @max - @created + @que.length
end

#pop(timeout = 0.5) ⇒ Object 



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

def pop(timeout=0.5)
  deadline = Time.now + timeout
  @mutex.synchronize do
    loop do
      raise ConnectionPool::PoolShuttingDownError if @shutdown_block
      return @que.pop unless @que.empty?
      unless @created == @max
        @created += 1
        return @create_block.call
      end
      to_wait = deadline - Time.now
      raise Timeout::Error, "Waited #{timeout} sec" if to_wait <= 0
      @resource.wait(@mutex, to_wait)
    end
  end
end

#push(obj) ⇒ Object Also known as: << 



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# File 'lib/connection_pool/timed_stack.rb', line 18

def push(obj)
  @mutex.synchronize do
    if @shutdown_block
      @shutdown_block.call(obj)
    else
      @que.push obj
    end

    @resource.broadcast
  end
end

#shutdown(&block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/connection_pool/timed_stack.rb', line 48

def shutdown(&block)
  raise ArgumentError, "shutdown must receive a block" unless block_given?

  @mutex.synchronize do
    @shutdown_block = block
    @resource.broadcast

    @que.size.times do
      conn = @que.pop
      block.call(conn)
    end
  end
end