keera-hails-reactive-polling (empty) → 0.0.3.3

raw patch · 4 files changed

+111/−0 lines, 4 filesdep +basedep +keera-callbacksdep +keera-hails-reactivevaluessetup-changed

Dependencies added: base, keera-callbacks, keera-hails-reactivevalues

Files

• LICENSE +30/−0
• Setup.hs +2/−0
• keera-hails-reactive-polling.cabal +56/−0
• src/Hails/Polling.hs +23/−0

@@ -0,0 +1,30 @@+Copyright (c) 2015, Ivan Perez++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * Redistributions in binary form must reproduce the above+      copyright notice, this list of conditions and the following+      disclaimer in the documentation and/or other materials provided+      with the distribution.++    * Neither the name of Ivan Perez nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,56 @@+-- hails.cabal auto-generated by cabal init. For additional options,+-- see+-- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr.+-- The name of the package.+Name:                keera-hails-reactive-polling++-- The package version. See the Haskell package versioning policy+-- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for+-- standards guiding when and how versions should be incremented.+Version:             0.0.3.3++-- A short (one-line) description of the package.+Synopsis:            Haskell on Rails - Polling based Readable RVs++-- URL for the project homepage or repository.+Homepage:            http://www.keera.es/blog/community/++-- The license under which the package is released.+License:             BSD3++-- The file containing the license text.+License-file:        LICENSE++-- The package author(s).+Author:              Ivan Perez++-- An email address to which users can send suggestions, bug reports,+-- and patches.+Maintainer:          ivan.perez@keera.co.uk++-- A copyright notice.+-- Copyright:           ++Category:            Development++Build-type:          Simple++-- Extra files to be distributed with the package, such as examples or+-- a README.+-- Extra-source-files:  ++-- Constraint on the version of Cabal needed to build this package.+Cabal-version:       >=1.2++Library+  hs-source-dirs: src/+  +  ghc-options: -Wall -fno-warn-unused-do-bind -O2++  -- Modules exported by the library.+  Exposed-modules: Hails.Polling+  +  -- Packages needed in order to build this package.+  Build-depends: base >= 4 && < 5+               , keera-hails-reactivevalues+               , keera-callbacks

@@ -0,0 +1,23 @@+module Hails.Polling where++import Control.Concurrent (forkIO, threadDelay)+import Control.Monad (forever, void)+import Data.CBMVar+import Data.ReactiveValue++pollingReactive :: IO a +                -> Maybe Int+                -> IO (ReactiveFieldRead IO a)+pollingReactive sensor delay = do+  initialV <- sensor+  mvar <- newCBMVar initialV++  forkIO $ forever $ do v <- sensor+                        writeCBMVar mvar v+                        maybe (return ()) (void . threadDelay) delay+              +  -- RV fields+  let getter   = readCBMVar mvar+      notifier = installCallbackCBMVar mvar++  return $ ReactiveFieldRead getter notifier