-- Copyright (c) 2013-2014 PivotCloud, Inc.
-- Control.Concurrent.STM.BoundedQueue
-- Please feel free to contact us at licensing@pivotmail.com with any
-- contributions, additions, or other feedback; we would love to hear from
-- you.
-- Licensed under the Apache License, Version 2.0 (the "License"); you may
-- not use this file except in compliance with the License. You may obtain a
-- copy of the License at http://www.apache.org/licenses/LICENSE-2.0
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-- License for the specific language governing permissions and limitations
-- under the License.

{-# LANGUAGE Safe #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UnicodeSyntax #-}

module Control.Concurrent.STM.BoundedQueue
( BoundedQueue(..)
) where

import Control.Applicative
import Control.Concurrent.STM
import Control.Concurrent.STM.TBMQueue
import Control.Concurrent.STM.Queue

class Queue q  BoundedQueue q where
     q α
     STM (QueueValue q Bool)

     q α
     STM Bool

instance BoundedQueue TBQueue where
  tryWriteQueue q x = do
   True <$ writeTBQueue q x
     <|> pure False

  isFullQueue = isFullTBQueue

instance BoundedQueue TBMQueue where
  tryWriteQueue = tryWriteTBMQueue
  isFullQueue = isFullTBMQueue