thrift/tutorial/hs/HaskellServer.hs
2010-01-11 19:13:18 +00:00

103 lines
3.0 KiB
Haskell

--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements. See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership. The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License. You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing,
-- software distributed under the License is distributed on an
-- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-- KIND, either express or implied. See the License for the
-- specific language governing permissions and limitations
-- under the License.
--
import qualified Calculator
import Calculator_Iface
import Tutorial_Types
import SharedService_Iface
import Shared_Types
import Thrift
import Thrift.Protocol.Binary
import Thrift.Transport
import Thrift.Server
import Data.Maybe
import Text.Printf
import Control.Exception (throw)
import Control.Concurrent.MVar
import qualified Data.Map as M
import Data.Map ((!))
import Data.Monoid
data CalculatorHandler = CalculatorHandler {mathLog :: MVar (M.Map Int SharedStruct)}
newCalculatorHandler = do
log <- newMVar mempty
return $ CalculatorHandler log
instance SharedService_Iface CalculatorHandler where
getStruct self k = do
myLog <- readMVar (mathLog self)
return $ (myLog ! (fromJust k))
instance Calculator_Iface CalculatorHandler where
ping _ =
print "ping()"
add _ n1 n2 = do
printf "add(%d,%d)\n" (fromJust n1) (fromJust n2)
return ((fromJust n1)+(fromJust n2))
calculate self mlogid mwork = do
printf "calculate(%d, %s)\n" logid (show work)
let val = case op work of
ADD ->
num1 work + num2 work
SUBTRACT ->
num1 work - num2 work
MULTIPLY ->
num1 work * num2 work
DIVIDE ->
if num2 work == 0 then
throw $
InvalidOperation {
f_InvalidOperation_what = Just $ fromEnum $ op work,
f_InvalidOperation_why = Just "Cannot divide by 0"
}
else
num1 work `div` num2 work
let logEntry = SharedStruct (Just logid) (Just (show val))
modifyMVar_ (mathLog self) $ return .(M.insert logid logEntry)
return val
where
-- stupid dynamic languages f'ing it up
num1 = fromJust . f_Work_num1
num2 = fromJust . f_Work_num2
op = fromJust . f_Work_op
logid = fromJust mlogid
work = fromJust mwork
--return val
zip _ =
print "zip()"
main = do
handler <- newCalculatorHandler
print "Starting the server..."
runBasicServer handler Calculator.process 9090
print "done."