module ALife.Creatur.Universe
(
Universe(..),
SimpleUniverse,
mkSimpleUniverse,
agentDB,
clock,
logger,
multiLookup,
extra,
agentIds,
addAgent,
storeOrArchive
) where
import ALife.Creatur (Agent, AgentId, agentId, isAlive)
import ALife.Creatur.AgentNamer (AgentNamer, SimpleAgentNamer,
mkSimpleAgentNamer)
import qualified ALife.Creatur.AgentNamer as N (genName)
import ALife.Creatur.Clock (Clock, currentTime, incTime)
import ALife.Creatur.Counter (PersistentCounter, mkPersistentCounter)
import ALife.Creatur.Database as D (Database, DBRecord, Record,
delete, keys, lookup, store)
import ALife.Creatur.Database.FileSystem (FSDatabase, mkFSDatabase)
import ALife.Creatur.Logger (Logger, SimpleRotatingLogger,
mkSimpleRotatingLogger, writeToLog)
import Control.Lens (makeLenses, zoom)
import Control.Monad (unless)
import Control.Monad.State (StateT)
import Data.Either (partitionEithers)
import Data.Serialize (Serialize)
data Universe c l d n x a = Universe {
_clock :: c,
_logger :: l,
_agentDB :: d,
_namer :: n,
_extra :: x
}
makeLenses ''Universe
instance (Clock c, Logger l) => Logger (Universe c l d n x a) where
writeToLog msg = do
t <- currentTime
zoom logger $ writeToLog $ show t ++ "\t" ++ msg
instance Clock c => Clock (Universe c l d n x a) where
currentTime = zoom clock currentTime
incTime = zoom clock incTime
instance AgentNamer n => AgentNamer (Universe c l d n x a) where
genName = zoom namer N.genName
agentIds :: Database d => StateT (Universe c l d n x a) IO [String]
agentIds = zoom agentDB keys
multiLookup :: (Serialize a, Database d, Record a, a ~ DBRecord d) =>
[AgentId] -> StateT d IO (Either String [DBRecord d])
multiLookup names = do
results <- mapM D.lookup names
let (msgs, agents) = partitionEithers results
if null msgs
then return $ Right agents
else return . Left . show $ msgs
storeOrArchive ::
(Serialize a, Database d, Record a, Agent a, a ~ DBRecord d) =>
a -> StateT d IO ()
storeOrArchive a = do
store a
unless (isAlive a) $ (delete . agentId) a
addAgent :: (Serialize a, Database d, Record a, a ~ DBRecord d) =>
DBRecord d -> StateT (Universe c l d n x a) IO ()
addAgent a = zoom agentDB (store a)
type SimpleUniverse a =
Universe PersistentCounter SimpleRotatingLogger (FSDatabase a)
SimpleAgentNamer () a
mkSimpleUniverse :: String -> FilePath -> Int -> SimpleUniverse a
mkSimpleUniverse name dir rotateCount = Universe c l d n ()
where c = mkPersistentCounter (dir ++ "/clock")
l = mkSimpleRotatingLogger (dir ++ "/log/") name rotateCount
d = mkFSDatabase (dir ++ "/db")
n = mkSimpleAgentNamer (name ++ "_") (dir ++ "/namer")