content: {--*-Mode:haskell;coding:utf-8;tab-width:4;c-basic-offset:4;indent-tabs-mode:()-*-
    ex: set ft=haskell fenc=utf-8 sts=4 ts=4 sw=4 et nomod: -}
  
  {-
  
    MIT License
  
    Copyright (c) 2017-2020 Michael Truog <mjtruog at protonmail dot com>
  
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:
  
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
  
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
  
   -}
  
  module Main where
  
  import Data.Typeable (Typeable)
  import System.Exit (ExitCode(ExitFailure),exitWith)
  import qualified Control.Concurrent as Concurrent
  import qualified Data.ByteString as ByteString
  import qualified Data.ByteString.Char8 as Char8
  import qualified Data.Map.Strict as Map
  import qualified Foreign.CloudI as CloudI
  import qualified System.IO as SysIO
  type ByteString = ByteString.ByteString
  type RequestType = CloudI.RequestType
  type Source = CloudI.Source
  
  data CountState = State
      { count_value :: !Int
      }
      deriving (Typeable)
  
  request_ :: RequestType -> ByteString -> ByteString ->
      ByteString -> ByteString -> Int -> Int -> ByteString -> Source ->
      CountState -> CloudI.T CountState -> IO (CloudI.Response CountState)
  request_ _ _ _ _ _ _ _ _ _ state@State{count_value = count0} api = do
      let count1 = if count0 == 4294967295 then 0 else count0 + 1
          count_str = show count1
      putStrLn $ "count == " ++ count_str ++ " haskell"
      let response = Char8.pack count_str
          responseInfo = CloudI.infoKeyValueNew Map.empty Nothing
      return $ CloudI.ResponseInfo (responseInfo, response,
                                    state{count_value = count1}, api)
  
  task :: Int -> IO ()
  task threadIndex = do
      let prerr = SysIO.hPutStrLn SysIO.stderr
          prout = putStrLn
      apiValue <- CloudI.api threadIndex State{count_value = 0} Nothing
      case apiValue of
          Left err ->
              prerr err
          Right api0 -> do
              let suffix = Char8.pack "haskell/get"
              subscribeValue <- CloudI.subscribe api0 suffix request_
              case subscribeValue of
                  Left err ->
                      prerr err
                  Right api1 -> do
                      pollValue <- CloudI.poll api1 (-1)
                      case pollValue of
                          Left err ->
                              prerr err
                          Right (_, _) ->
                              prout "terminate count haskell"
  
  main :: IO ()
  main = do
      threadCountValue <- CloudI.threadCount
      case threadCountValue of
          Left err -> do
              SysIO.hPutStrLn SysIO.stderr err
              _ <- exitWith (ExitFailure 1)
              return ()
          Right threadCount -> do
              Concurrent.setNumCapabilities threadCount
              mapM_ (CloudI.threadCreate task) [0..threadCount - 1]
              CloudI.threadsWait
  
  