Pinto.GenServer

type InitFn cont stop msg state = ResultT cont stop msg state (InitResult cont state)

The callback invoked on GenServer startup: see gen_server:init

data InitResult cont state

The various return values from an init callback These roughly map onto the tuples in the OTP documentation

Constructors

• InitOk state
• InitOkTimeout state Int
• InitOkContinue state cont
• InitOkHibernate state
• InitStop Foreign
• InitIgnore

type ServerSpec cont stop msg state = { handleContinue :: Maybe (ContinueFn cont stop msg state), handleInfo :: Maybe (InfoFn cont stop msg state), init :: InitFn cont stop msg state, name :: Maybe (RegistryName (ServerType cont stop msg state)), terminate :: Maybe (TerminateFn cont stop msg state), trapExits :: Maybe (ExitMessage -> msg) }

The configuration passed into startLink in order to start a gen server Everything except the 'init' callback is optional Note: GenServers started without a name will not be callable without some means of retrieving the pid

newtype ServerType cont stop msg state

newtype ServerPid cont stop msg state

Instances

• Eq (ServerPid cont stop msg state)
• HasPid (ServerPid cont stop msg state)
• HasProcess msg (ServerPid const stop msg state)
• Show (ServerPid cont stop msg state)

type ServerRef cont stop msg state = RegistryReference (ServerPid cont stop msg state) (ServerType cont stop msg state)

The typed reference of a GenServer, containing all the information required to get hold of an instance

type CallFn reply cont stop msg state = From reply -> state -> ResultT cont stop msg state (CallResult reply cont stop state)

The callback invoked within a GenServer.call: see gen_server:call

data CallResult reply cont stop state

The result of a GenServer.call (handle_call) action

Constructors

• CallResult (Maybe reply) (Maybe (Action cont stop)) state

Instances

• Functor (CallResult reply cont stop)

type CastFn cont stop msg state = state -> ResultT cont stop msg state (ReturnResult cont stop state)

The type of the handleCast callback see gen_server:cast

type InfoFn cont stop msg state = msg -> state -> ResultT cont stop msg state (ReturnResult cont stop state)

The type of the handleInfo callback see gen_server:handle_info

type TerminateFn cont stop msg state = ShutdownReason -> state -> ResultT cont stop msg state Unit

The type of the terminate callback see gen_server:terminate

type ContinueFn cont stop msg state = cont -> state -> ResultT cont stop msg state (ReturnResult cont stop state)

The type of the handleContinue callback see gen_server:handle_continue

data ReturnResult cont stop state

The result of a GenServer.handle_info or GenServer.handle_cast callback

Constructors

• ReturnResult (Maybe (Action cont stop)) state

Instances

• Functor (ReturnResult cont stop)

newtype From reply

newtype ResultT cont stop msg state result

The reader monad in which all GenServer operations take place

• cont is the type that will be passed into a handle_continue callback, if there is no handleContinue present, this can just be 'Unit'
• stop is the data type that can be returned with the StopOther action if StopOther is not being used, then this can simply 'Unit'
• msg represents the type of message that this gen server will receive in its handleInfo callback, if no messages are expected, this can simply be 'Unit'
• state represents the internal state of this GenServer, created in 'init and then passed into each subsequent callback
• result is the result of any operation within a ResultT context

Instances

• Functor (ResultT cont stop msg state)
• Apply (ResultT cont stop msg state)
• Applicative (ResultT cont stop msg state)
• Bind (ResultT cont stop msg state)
• Monad (ResultT cont stop msg state)
• MonadEffect (ResultT cont stop msg state)
• ReceivesMessage (ResultT cont stop msg state) msg
• HasSelf (ResultT cont stop msg state) msg

newtype Context cont stop msg state

data Action cont stop

An action to be returned to OTP See {shutdown, reason}, {timeout...} etc in the gen_server documentation This should be constructed and returned with the xxWithAction methods inside GenServer callbacks

Constructors

• Timeout Int
• Hibernate
• Continue cont
• StopNormal
• StopOther stop

defaultSpec :: forall cont stop msg state. InitFn cont stop msg state -> ServerSpec cont stop msg state

Given an InitFn callback, create a default GenServer specification with all of the optionals set to default values This is the preferred method of creating the config passed into GenServer.startLink

startLink :: forall cont stop msg state. (ServerSpec cont stop msg state) -> Effect (StartLinkResult (ServerPid cont stop msg state))

Given a specification, starts a GenServer

Standard usage:

GenServer.startLink $ GenServer.defaultSpec init
  where
  init :: InitFn Unit Unit Unit {}
  init = pure $ InitOk {}

call :: forall reply cont stop msg state. ServerRef cont stop msg state -> CallFn reply cont stop msg state -> Effect reply

cast :: forall cont stop msg state. ServerRef cont stop msg state -> CastFn cont stop msg state -> Effect Unit

stop :: forall cont stop msg state. ServerRef cont stop msg state -> Effect Unit

reply :: forall reply cont stop state. reply -> state -> CallResult reply cont stop state

Creates a result from inside a GenServer 'handle_call' that results in the 'reply' result being sent to the caller and the new state being stored

replyWithAction :: forall reply cont stop state. reply -> Action cont stop -> state -> CallResult reply cont stop state

Creates a result from inside a GenServer 'handle_call' that results in the 'reply' result being sent to the caller , the new state being stored and the attached action being returned to OTP for processing

noReply :: forall reply cont stop state. state -> CallResult reply cont stop state

Creates a result from inside a GenServer 'handle_call' that results in the new state being stored and nothing being returned to the caller (yet)

noReplyWithAction :: forall reply cont stop state. Action cont stop -> state -> CallResult reply cont stop state

Creates a result from inside a GenServer 'handle_call' that results in the new state being stored and nothing being returned to the caller (yet) and the attached action being returned to OTP for processing

return :: forall cont stop state. state -> ReturnResult cont stop state

Creates a result from inside a GenServer 'handle_info/handle_cast' that results in the new state being stored

returnWithAction :: forall cont stop state. Action cont stop -> state -> ReturnResult cont stop state

Creates a result from inside a GenServer 'handle_info/handle_cast' that results in the new state being stored and the attached action being returned to OTP for processing

replyTo :: forall cont stop msg state reply. From reply -> reply -> ResultT cont stop msg state Unit

whereIs :: forall cont stop msg state. RegistryName (ServerType cont stop msg state) -> Effect (Maybe (ServerPid cont stop msg state))

Given a RegistryName with a valid (ServerType), get hold of a typed Process msg to which messages can be sent (arriving in the handleInfo callback)

init :: forall cont state. EffectFn1 (List (Effect (InitResult cont state))) (NativeInitResult state)

handle_call :: forall reply cont stop msg state. EffectFn3 (CallFn reply cont stop msg state) (From reply) (OuterState cont stop msg state) (NativeCallResult reply cont stop (OuterState cont stop msg state))

handle_cast :: forall cont stop msg state. EffectFn2 (CastFn cont stop msg state) (OuterState cont stop msg state) (NativeReturnResult cont stop (OuterState cont stop msg state))

handle_info :: forall cont stop msg state. EffectFn2 Foreign (OuterState cont stop msg state) (NativeReturnResult cont stop (OuterState cont stop msg state))

handle_continue :: forall cont stop msg state. EffectFn2 cont (OuterState cont stop msg state) (NativeReturnResult cont stop (OuterState cont stop msg state))

terminate :: forall cont stop msg state. EffectFn2 Foreign (OuterState cont stop msg state) Atom

data NativeInitResult t0

data NativeCallResult t0 t1 t2 t3

data NativeReturnResult t0 t1 t2

exportInitResult :: forall cont state. InitResult cont state -> NativeInitResult state

exportCallResult :: forall reply cont stop outerState. CallResult reply cont stop outerState -> NativeCallResult reply cont stop outerState

exportReturnResult :: forall cont stop outerState. ReturnResult cont stop outerState -> NativeReturnResult cont stop outerState

liftEffect :: forall m a. MonadEffect m => Effect a -> m a

data ShutdownReason

Constructors

• ReasonNormal
• ReasonShutdown (Maybe Foreign)
• ReasonOther Foreign

data ExitMessage

Constructors

• Exit Pid Foreign