-- |
-- Module     : Simulation.Aivika.Trans.GPSS.Block.Depart
-- Copyright  : Copyright (c) 2017, David Sorokin <david.sorokin@gmail.com>
-- License    : BSD3
-- Maintainer : David Sorokin <david.sorokin@gmail.com>
-- Stability  : experimental
-- Tested with: GHC 8.0.2
--
-- This module defines the GPSS block DEPART.
--
module Simulation.Aivika.Trans.GPSS.Block.Depart
       (departBlock) where

import Simulation.Aivika.Trans
import Simulation.Aivika.Trans.GPSS.Transact
import Simulation.Aivika.Trans.GPSS.Block
import qualified Simulation.Aivika.Trans.GPSS.Queue as Q

-- | This is the GPSS construct
--
-- @DEPART A,B@
departBlock :: MonadDES m
               => Q.Queue m
               -- ^ the queue
               -> Int
               -- ^ the content decrement
               -> Block m (Transact m a) (Transact m a)
{-# INLINABLE departBlock #-}
departBlock :: forall (m :: * -> *) a.
MonadDES m =>
Queue m -> Int -> Block m (Transact m a) (Transact m a)
departBlock Queue m
q Int
decrement =
  Block { blockProcess :: Transact m a -> Process m (Transact m a)
blockProcess = \Transact m a
a -> (forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
EventLift t m =>
Event m a -> t m a
liftEvent forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a.
MonadDES m =>
Queue m -> Transact m a -> Int -> Event m ()
Q.dequeue Queue m
q Transact m a
a Int
decrement) forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> forall (m :: * -> *) a. Monad m => a -> m a
return Transact m a
a }