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Update 2nd chapter of tutorial #22

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Update 2nd chapter of tutorial #22

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15 changes: 10 additions & 5 deletions tutorials/2ch.md
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Original file line number Diff line number Diff line change
Expand Up @@ -26,18 +26,23 @@ searches for a list of peer nodes, and sends a message to a registered (named) p
{% highlight haskell %}
import System.Environment (getArgs)
import Control.Distributed.Process
import Control.Distributed.Process.Node (initRemoteTable)
import Control.Distributed.Process.Backend.SimpleLocalnet
import Control.Distributed.Process.Node (initRemoteTable, runProcess, LocalNode)
import Control.Distributed.Process.Backend.SimpleLocalnet (initializeBackend, newLocalNode, findPeers, Backend)
import Control.Monad (forever, mapM_)

main :: IO()
main = do
[host, port] <- getArgs

backend <- initializeBackend host port initRemoteTable
node <- newLocalNode backend
runProcess node $ forever $ do
findPeers backend >>= mapM_ $ \peer -> nsendRemote peer "echo-server" "hello!"
peers <- findPeers backend 1000000
runProcess node (messagePeers peers)

messagePeers :: [NodeId] -> Process()
messagePeers = mapM_ (\peer -> sendMessage peer "hello!")

sendMessage :: NodeId -> String -> Process()
sendMessage peer = nsendRemote peer "echo-server"
{% endhighlight %}

Clearly the program isn't very useful, but it illustrates the two key concepts that
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