WashNGo-2.9: WASH is a family of embedded domain specific languages (EDSL) for programming Web applications in Haskell. Contents Index

WASH.CGI.CGIHistory

Synopsis

historyTimeout :: Int type StateID = (String, String) history :: MVar (Map StateID TableEntry) data TableEntry = TableEntry { myID :: StateID parentID :: (Maybe StateID) nextparm :: PARAMETER timeout :: Int threads :: (MVar [MVar (CGIParameters, Handle)]) } createEntry :: StateID -> Maybe StateID -> PARAMETER -> Maybe Int -> IO () readParameters :: StateID -> IO (CGIParameters, Handle) notify :: StateID -> CGIParameters -> Handle -> IO Bool

Documentation

historyTimeout :: Int

standard value for timeout of interaction threads: one hundred seconds

type StateID = (String, String)

comprises the name of the application and a hash value.

history :: MVar (Map StateID TableEntry)

data TableEntry

Constructors TableEntry myID :: StateID script name and hash key parentID :: (Maybe StateID) root has no parent nextparm :: PARAMETER timeout :: Int timeout for this stage of interaction threads :: (MVar [MVar (CGIParameters, Handle)]) next round of parameters and output handle

createEntry :: StateID -> Maybe StateID -> PARAMETER -> Maybe Int -> IO ()

Takes the id of the current node, the id of the father node (if any), the current parameter, and (perhaps) a timeout value for the current interaction and enters a corresponding record into the history table.

readParameters :: StateID -> IO (CGIParameters, Handle)

Suspends the current thread by waiting on an entry with the current node's id. Returns the parameters passed to this node.

notify :: StateID -> CGIParameters -> Handle -> IO Bool

Attempts to pass parameters and a handle to a thread waiting for the given stateID. Returns True if successful and False if no such thread was found.

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