Commit 70076265 authored by Ibnu Daru Aji's avatar Ibnu Daru Aji

uses safe-globals.

parent f8654529
......@@ -4,6 +4,7 @@ version: "0.0.0"
dependencies:
- base
- yesod-core
- safe-globals >= 0.2.0
# The library contains all of our application code. The executable
# defined below is just a thin wrapper.
......
......@@ -7,12 +7,11 @@ import Foundation
import Yesod.Core
getGlobR :: Int -> Handler Html
getGlobR x = do
UniqueRef r <- liftIO runOnceIO
lama <- liftIO $ readIORef r
baru <- liftIO $ somethingInt x
getGlobR youregg = do
myeggs <- liftIO $ readIORef egg
oureggs <- liftIO $ joinOurEggs youregg
defaultLayout
[whamlet|
<p>Lama: #{lama}
<p>Baru: #{baru}
<p>My Eggs: #{myeggs}
<p>Added by your Eggs: #{oureggs}
|]
......@@ -5,14 +5,21 @@
{-# LANGUAGE ViewPatterns #-}
module Foundation where
import Control.Concurrent.MVar (MVar, modifyMVar, newMVar)
import Control.Monad (liftM)
import Data.IORef (IORef, newIORef, readIORef,
writeIORef)
import System.IO.Unsafe (unsafePerformIO)
import Data.IORef (readIORef, writeIORef)
import Data.Global
import Yesod.Core
declareIORef "egg" [t|Int|] [|0|]
joinOurEggs :: Int -> IO Int
joinOurEggs youreggs = do
myeggs <- readIORef egg
let oureggs = myeggs + youreggs
writeIORef egg oureggs
return oureggs
data App = App
mkYesodData
......@@ -24,31 +31,3 @@ mkYesodData
instance Yesod App
class OnceInit a where
onceInit :: IO a
class OnceInit a => OnceIO a where
runOnceIO :: IO a
newtype UniqueRef =
UniqueRef (IORef Int)
instance OnceIO UniqueRef where
runOnceIO = modifyMVar onceUniqueRef $ \mx -> case mx of
Just x -> return (Just x, x)
Nothing -> do
x <- onceInit
return (Just x, x)
somethingInt :: Int -> IO Int
somethingInt i = do
UniqueRef r <- runOnceIO
n <- readIORef r
writeIORef r (n + i)
return (n + i)
onceUniqueRef :: MVar (Maybe a)
onceUniqueRef = unsafePerformIO $ newMVar Nothing
instance OnceInit UniqueRef where
onceInit = liftM UniqueRef (newIORef 0)
# This file was automatically generated by 'stack init'
#
# Some commonly used options have been documented as comments in this file.
# For advanced use and comprehensive documentation of the format, please see:
# https://docs.haskellstack.org/en/stable/yaml_configuration/
# Resolver to choose a 'specific' stackage snapshot or a compiler version.
# A snapshot resolver dictates the compiler version and the set of packages
# to be used for project dependencies. For example:
#
# resolver: lts-3.5
# resolver: nightly-2015-09-21
# resolver: ghc-7.10.2
# resolver: ghcjs-0.1.0_ghc-7.10.2
#
# The location of a snapshot can be provided as a file or url. Stack assumes
# a snapshot provided as a file might change, whereas a url resource does not.
#
# resolver: ./custom-snapshot.yaml
# resolver: https://example.com/snapshots/2018-01-01.yaml
resolver: lts-11.3
# User packages to be built.
# Various formats can be used as shown in the example below.
#
# packages:
# - some-directory
# - https://example.com/foo/bar/baz-0.0.2.tar.gz
# - location:
# git: https://github.com/commercialhaskell/stack.git
# commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
# subdirs:
# - auto-update
# - wai
packages:
- .
# Dependency packages to be pulled from upstream that are not in the resolver
# using the same syntax as the packages field.
# (e.g., acme-missiles-0.3)
# extra-deps: []
# Override default flag values for local packages and extra-deps
# flags: {}
# Extra package databases containing global packages
# extra-package-dbs: []
# Control whether we use the GHC we find on the path
# system-ghc: true
#
# Require a specific version of stack, using version ranges
# require-stack-version: -any # Default
# require-stack-version: ">=1.7"
#
# Override the architecture used by stack, especially useful on Windows
# arch: i386
# arch: x86_64
#
# Extra directories used by stack for building
# extra-include-dirs: [/path/to/dir]
# extra-lib-dirs: [/path/to/dir]
#
# Allow a newer minor version of GHC than the snapshot specifies
# compiler-check: newer-minor
extra-deps:
- git: https://github.com/ibnuda/safe-globals.git
commit: b3c1987a743afda58f53d5844cfba4e4ff7c449d
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