Control.Eff.Concurrent.Protocol.EffectfulServer

A better, more safe implementation of the Erlang/OTP gen_server behaviour.

Since: 0.24.0

Documentation

class Server (a :: Type) (e :: [Type -> Type]) where

A type class for building supervised processes, that handle Events with Requests for Pdu instance.

Since: 0.24.1

Minimal complete definition

Nothing

Associated Types

data Init a e

The value that defines what is required to initiate a Server loop.

type ServerPdu a :: Type

The index type of the Events that this server processes. This is the first parameter to the Request and therefore of the Pdu family.

type Effects a e :: [Type -> Type]

Effects of the implementation

Since: 0.24.1

Methods

serverTitle :: Init a e -> ProcessTitle

Return the ProcessTitle.

Usually you should rely on the default implementation

serverTitle :: Typeable (ServerPdu a) => Init a e -> ProcessTitle

Return the ProcessTitle.

Usually you should rely on the default implementation

runEffects :: Init a e -> Eff (Effects a e) x -> Eff e x

Process the effects of the implementation

runEffects :: Effects a e ~ e => Init a e -> Eff (Effects a e) x -> Eff e x

Process the effects of the implementation

onEvent :: Init a e -> Event (ServerPdu a) -> Eff (Effects a e) ()

Update the Model based on the Event.

onEvent :: (Show (Init a e), Member Logs (Effects a e)) => Init a e -> Event (ServerPdu a) -> Eff (Effects a e) ()

Update the Model based on the Event.

Instances

TangibleGenServer tag eLoop e => Server (GenServer tag eLoop e) (InterruptableProcess e)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Associated Types

data Init (GenServer tag eLoop e) (InterruptableProcess e) :: Type

type ServerPdu (GenServer tag eLoop e) :: Type

type Effects (GenServer tag eLoop e) (InterruptableProcess e) :: [Type -> Type]

Methods

serverTitle :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> ProcessTitle

runEffects :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> Eff (Effects (GenServer tag eLoop e) (InterruptableProcess e)) x -> Eff (InterruptableProcess e) x

onEvent :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> Event (ServerPdu (GenServer tag eLoop e)) -> Eff (Effects (GenServer tag eLoop e) (InterruptableProcess e)) ()

data Event a where

Internal protocol to communicate incoming messages and other events to the instances of Server.

Note that this is required to receive any kind of messages in protocolServerLoop.

Since: 0.24.0

Constructors

OnCall :: forall a r. (Tangible r, TangiblePdu a (Synchronous r)) => Serializer (Reply a r) -> RequestOrigin a r -> Pdu a (Synchronous r) -> Event a

A Synchronous message was received. If an implementation wants to delegate nested Pdus, it can contramap the reply Serializer such that the Reply received by the caller has the correct type.

Since: 0.24.1

OnCast :: forall a. TangiblePdu a Asynchronous => Pdu a Asynchronous -> Event a

OnInterrupt :: Interrupt Recoverable -> Event a

OnDown :: ProcessDown -> Event a

OnTimeOut :: TimerElapsed -> Event a

OnMessage :: StrictDynamic -> Event a

Instances

Show (Event a)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

showsPrec :: Int -> Event a -> ShowS

show :: Event a -> String

showList :: [Event a] -> ShowS

NFData a => NFData (Event a)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

rnf :: Event a -> ()

type ToPretty (Event a :: Type)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

type ToPretty (Event a :: Type) = ToPretty a <+> PutStr "event"

start :: forall a q h. (Server a (InterruptableProcess q), Typeable a, Typeable (ServerPdu a), LogsTo h (InterruptableProcess q), SetMember Process (Process q) (Effects a (InterruptableProcess q)), Member Interrupts (Effects a (InterruptableProcess q)), HasCallStack) => Init a (InterruptableProcess q) -> Eff (InterruptableProcess q) (Endpoint (ServerPdu a))

Execute the server loop.

Since: 0.24.0

startLink :: forall a q h. (Typeable a, Typeable (ServerPdu a), Server a (InterruptableProcess q), LogsTo h (InterruptableProcess q), SetMember Process (Process q) (Effects a (InterruptableProcess q)), Member Interrupts (Effects a (InterruptableProcess q)), HasCallStack) => Init a (InterruptableProcess q) -> Eff (InterruptableProcess q) (Endpoint (ServerPdu a))

Execute the server loop.

Since: 0.24.0

protocolServerLoop :: forall q h a. (Server a (InterruptableProcess q), LogsTo h (InterruptableProcess q), SetMember Process (Process q) (Effects a (InterruptableProcess q)), Member Interrupts (Effects a (InterruptableProcess q)), Typeable a, Typeable (ServerPdu a)) => Init a (InterruptableProcess q) -> Eff (InterruptableProcess q) ()

Execute the server loop.

Since: 0.24.0

GenServer

type TangibleGenServer tag eLoop e = (LogIo e, SetMember Process (Process e) eLoop, Member Interrupts eLoop, Typeable e, Typeable eLoop, Typeable tag)

The constraints for a tangible GenServer instance.

Since: 0.24.1

data GenServer tag eLoop e

Make a Server from a data record instead of type-class instance.

Sometimes it is much more concise to create an inline server-loop. In those cases it might not be practical to go through all this type class boilerplate.

In these cases specifying a server by from a set of callback functions seems much more appropriate.

This is such a helper. The GenServer is a record with to callbacks, and a Server instance that simply invokes the given callbacks.

Servers that are directly based on LogIo and InterruptableProcess effects.

The name prefix Gen indicates the inspiration from Erlang's gen_server module.

Since: 0.24.1

Instances

Typeable tag => Show (Init (GenServer tag eLoop e) (InterruptableProcess e))

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

showsPrec :: Int -> Init (GenServer tag eLoop e) (InterruptableProcess e) -> ShowS

show :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> String

showList :: [Init (GenServer tag eLoop e) (InterruptableProcess e)] -> ShowS

NFData (Init (GenServer tag eLoop e) (InterruptableProcess e))

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

rnf :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> ()

TangibleGenServer tag eLoop e => Server (GenServer tag eLoop e) (InterruptableProcess e)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Associated Types

data Init (GenServer tag eLoop e) (InterruptableProcess e) :: Type

type ServerPdu (GenServer tag eLoop e) :: Type

type Effects (GenServer tag eLoop e) (InterruptableProcess e) :: [Type -> Type]

Methods

serverTitle :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> ProcessTitle

runEffects :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> Eff (Effects (GenServer tag eLoop e) (InterruptableProcess e)) x -> Eff (InterruptableProcess e) x

onEvent :: Init (GenServer tag eLoop e) (InterruptableProcess e) -> Event (ServerPdu (GenServer tag eLoop e)) -> Eff (Effects (GenServer tag eLoop e) (InterruptableProcess e)) ()

type ServerPdu (GenServer tag eLoop e)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

type ServerPdu (GenServer tag eLoop e) = tag

data Init (GenServer tag eLoop e) (InterruptableProcess e)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

data Init (GenServer tag eLoop e) (InterruptableProcess e) = GenServerInit {

• genServerCallbacks :: GenServer tag eLoop e
• genServerId :: GenServerId tag

}

type Effects (GenServer tag eLoop e) (InterruptableProcess e)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

type Effects (GenServer tag eLoop e) (InterruptableProcess e) = eLoop

newtype GenServerId tag

The name/id of a GenServer for logging purposes.

Since: 0.24.0

Constructors

MkGenServerId

Fields

• _fromGenServerId :: Text

Instances

Eq (GenServerId tag)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

(==) :: GenServerId tag -> GenServerId tag -> Bool

(/=) :: GenServerId tag -> GenServerId tag -> Bool

Ord (GenServerId tag)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

compare :: GenServerId tag -> GenServerId tag -> Ordering

(<) :: GenServerId tag -> GenServerId tag -> Bool

(<=) :: GenServerId tag -> GenServerId tag -> Bool

(>) :: GenServerId tag -> GenServerId tag -> Bool

(>=) :: GenServerId tag -> GenServerId tag -> Bool

max :: GenServerId tag -> GenServerId tag -> GenServerId tag

min :: GenServerId tag -> GenServerId tag -> GenServerId tag

(Typeable k, Typeable tag) => Show (GenServerId tag)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

showsPrec :: Int -> GenServerId tag -> ShowS

show :: GenServerId tag -> String

showList :: [GenServerId tag] -> ShowS

IsString (GenServerId tag)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

fromString :: String -> GenServerId tag

NFData (GenServerId tag)

Defined in Control.Eff.Concurrent.Protocol.EffectfulServer

Methods

rnf :: GenServerId tag -> ()

genServer :: forall tag eLoop e. (HasCallStack, TangibleGenServer tag eLoop e, Server (GenServer tag eLoop e) (InterruptableProcess e)) => (forall x. GenServerId tag -> Eff eLoop x -> Eff (InterruptableProcess e) x) -> (GenServerId tag -> Event tag -> Eff eLoop ()) -> GenServerId tag -> Init (GenServer tag eLoop e) (InterruptableProcess e)

Create a GenServer.

This requires the callback for Events, a initial Model and a GenServerId.

There must be a GenServerProtocol instance.

This is Haskell, so if this functions is partially applied to some Event callback, you get a function back, that generates Inits from GenServerIds, like a factory

Since: 0.24.0

Re-exports

data RequestOrigin (proto :: Type) reply

Wraps the source ProcessId and a unique identifier for a Call.

Since: 0.15.0

Constructors

RequestOrigin

Fields

• _requestOriginPid :: !ProcessId
• _requestOriginCallRef :: !Int

Instances

Eq (RequestOrigin proto reply)

Defined in Control.Eff.Concurrent.Protocol.Request

Methods

(==) :: RequestOrigin proto reply -> RequestOrigin proto reply -> Bool

(/=) :: RequestOrigin proto reply -> RequestOrigin proto reply -> Bool

Ord (RequestOrigin proto reply)

Defined in Control.Eff.Concurrent.Protocol.Request

Methods

compare :: RequestOrigin proto reply -> RequestOrigin proto reply -> Ordering

(<) :: RequestOrigin proto reply -> RequestOrigin proto reply -> Bool

(<=) :: RequestOrigin proto reply -> RequestOrigin proto reply -> Bool

(>) :: RequestOrigin proto reply -> RequestOrigin proto reply -> Bool

(>=) :: RequestOrigin proto reply -> RequestOrigin proto reply -> Bool

max :: RequestOrigin proto reply -> RequestOrigin proto reply -> RequestOrigin proto reply

min :: RequestOrigin proto reply -> RequestOrigin proto reply -> RequestOrigin proto reply

Show (RequestOrigin p r)

Defined in Control.Eff.Concurrent.Protocol.Request

Methods

showsPrec :: Int -> RequestOrigin p r -> ShowS

show :: RequestOrigin p r -> String

showList :: [RequestOrigin p r] -> ShowS

Generic (RequestOrigin proto reply)

Defined in Control.Eff.Concurrent.Protocol.Request

Associated Types

type Rep (RequestOrigin proto reply) :: Type -> Type

Methods

from :: RequestOrigin proto reply -> Rep (RequestOrigin proto reply) x

to :: Rep (RequestOrigin proto reply) x -> RequestOrigin proto reply

NFData (RequestOrigin p r)

Defined in Control.Eff.Concurrent.Protocol.Request

Methods

rnf :: RequestOrigin p r -> ()

type Rep (RequestOrigin proto reply)

Defined in Control.Eff.Concurrent.Protocol.Request

type Rep (RequestOrigin proto reply) = D1 (MetaData "RequestOrigin" "Control.Eff.Concurrent.Protocol.Request" "extensible-effects-concurrent-0.24.1-7VbTaDuu8D6CKvnzB0ZvnK" False) (C1 (MetaCons "RequestOrigin" PrefixI True) (S1 (MetaSel (Just "_requestOriginPid") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 ProcessId) :*: S1 (MetaSel (Just "_requestOriginCallRef") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Int)))

data Reply protocol reply where

The wrapper around replies to Calls.

Since: 0.15.0

Constructors

Reply

Fields

• :: Tangible reply
• => { _replyTo :: RequestOrigin protocol reply
•    , _replyValue :: reply
•    } -> Reply protocol reply

Instances

Show r => Show (Reply p r)

Defined in Control.Eff.Concurrent.Protocol.Request

Methods

showsPrec :: Int -> Reply p r -> ShowS

show :: Reply p r -> String

showList :: [Reply p r] -> ShowS

NFData (Reply p r)

Defined in Control.Eff.Concurrent.Protocol.Request

Methods

rnf :: Reply p r -> ()

sendReply :: (SetMember Process (Process q) eff, Member Interrupts eff, Tangible reply, Typeable protocol) => Serializer (Reply protocol reply) -> RequestOrigin protocol reply -> reply -> Eff eff ()

Send a Reply to a Call.

The reply will be deeply evaluated to rnf.

Since: 0.15.0