Anonymous avatar Anonymous committed fb19c75

Added a function for folding over the phases of a MapReduce job.

Comments (0)

Files changed (1)


-{-# LANGUAGE OverloadedStrings, RecordWildCards #-}
+{-# LANGUAGE OverloadedStrings, RecordWildCards, DoAndIfThenElse #-}
 -- |
 -- Module:      Network.Riak.Basic
     , setBucket
     -- * Map/reduce
     , mapReduce
+    , foldMapReduce
     ) where
 import Control.Applicative ((<$>))
 -- | Launch a 'MapReduce' job.
 mapReduce :: Connection -> Job -> IO MapReduce
 mapReduce conn = exchange conn . Req.mapReduce
+foldMapReduce :: Connection -> Job -> (MapReduce -> a -> a) -> a -> IO a
+foldMapReduce conn job f start = do
+  mr <- mapReduce conn job
+  loop mr start
+    where loop mr s = do
+            let nextA = f mr s
+            if (maybe False id (Network.Riak.Protocol.MapReduce.done mr)) then
+              return nextA
+            else 
+              (recvResponse conn >>= \r -> loop r nextA)
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.