concurrent-batch alternatives and similar packages
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Concurrent STM Batch
This package facilitates batch processing based on STM. Batches are both sized, and have automatic timeout functionality.
The batch handler lives inside STM. Batches should not be processed at this stage but instead pushed somewhere else for processing. In this simple example we store the results in a TMVar and process them with
putStrLn. Requiring the initial handler to be in STM instead of IO increases async exception safety without having to mask on a potentially blocked action.
import Control.Concurrent.STM import Control.Concurrent.STM.TMVar import Control.Concurrent.STM.Batch main :: IO () main = do -- Create variable that batches are pushed to output <- newEmptyTMVarIO -- Create batches of 3 elements with a timeout of 10 seconds batcher <- newBatch 3 (Just $ fromSecs 10) (putTMVar output) -- Write 3 items to the batcher mapM_ (writeBatch batcher) [1 2 3] -- Get the first result batch batch1 <- atomically $ takeTMVar output -- See [3 2 1] putStrLn batch1