Safe Haskell | None |
---|---|
Language | Haskell2010 |
Erlang style processes with message passing concurrency based on
(more) extensible-effects
.
This module re-exports most of the library.
There are several scheduler implementations to choose from.
This module re-exports Control.Eff.Concurrent.Process.ForkIOScheduler.
To use another scheduler implementation, don't import this module, but instead import one of:
Synopsis
- newtype ProcessId = ProcessId {}
- data ProcessDown = ProcessDown {}
- data MonitorReference = MonitorReference {}
- data SomeExitReason where
- SomeExitReason :: Interrupt x -> SomeExitReason
- type Interrupts = Exc (Interrupt Recoverable)
- type HasSafeProcesses e inner = SetMember Process (Process inner) e
- type SafeProcesses r = Process r ': r
- type HasProcesses e inner = (HasSafeProcesses e inner, Member Interrupts e)
- type Processes e = Interrupts ': SafeProcesses e
- type RecoverableInterrupt = Interrupt Recoverable
- data Interrupt (t :: ExitRecovery) where
- NormalExitRequested :: Interrupt Recoverable
- OtherProcessNotRunning :: ProcessId -> Interrupt Recoverable
- TimeoutInterrupt :: String -> Interrupt Recoverable
- LinkedProcessCrashed :: ProcessId -> Interrupt Recoverable
- ErrorInterrupt :: String -> Interrupt Recoverable
- ExitNormally :: Interrupt NoRecovery
- ExitUnhandledError :: Text -> Interrupt NoRecovery
- ExitProcessCancelled :: Interrupt NoRecovery
- data ExitSeverity
- = NormalExit
- | Crash
- data ExitRecovery
- data MessageSelector a
- data ResumeProcess v where
- Interrupted :: Interrupt Recoverable -> ResumeProcess v
- ResumeWith :: a -> ResumeProcess a
- newtype Serializer message = MkSerializer {
- runSerializer :: message -> StrictDynamic
- data StrictDynamic
- newtype ProcessDetails = MkProcessDetails {}
- newtype ProcessTitle = MkProcessTitle {}
- data Process (r :: [Type -> Type]) b where
- FlushMessages :: Process r (ResumeProcess [StrictDynamic])
- YieldProcess :: Process r (ResumeProcess ())
- SelfPid :: Process r (ResumeProcess ProcessId)
- Spawn :: ProcessTitle -> Eff (Process r ': r) () -> Process r (ResumeProcess ProcessId)
- SpawnLink :: ProcessTitle -> Eff (Process r ': r) () -> Process r (ResumeProcess ProcessId)
- Shutdown :: Interrupt NoRecovery -> Process r a
- SendShutdown :: ProcessId -> Interrupt NoRecovery -> Process r (ResumeProcess ())
- SendInterrupt :: ProcessId -> Interrupt Recoverable -> Process r (ResumeProcess ())
- SendMessage :: ProcessId -> StrictDynamic -> Process r (ResumeProcess ())
- ReceiveSelectedMessage :: forall r a. MessageSelector a -> Process r (ResumeProcess a)
- MakeReference :: Process r (ResumeProcess Int)
- Monitor :: ProcessId -> Process r (ResumeProcess MonitorReference)
- Demonitor :: MonitorReference -> Process r (ResumeProcess ())
- Link :: ProcessId -> Process r (ResumeProcess ())
- Unlink :: ProcessId -> Process r (ResumeProcess ())
- UpdateProcessDetails :: ProcessDetails -> Process r (ResumeProcess ())
- GetProcessState :: ProcessId -> Process r (ResumeProcess (Maybe (ProcessTitle, ProcessDetails, ProcessState)))
- fromProcessTitle :: Lens' ProcessTitle Text
- fromProcessDetails :: Lens' ProcessDetails Text
- toStrictDynamic :: (Typeable a, NFData a) => a -> StrictDynamic
- fromStrictDynamic :: Typeable a => StrictDynamic -> Maybe a
- unwrapStrictDynamic :: StrictDynamic -> Dynamic
- selectMessage :: Typeable t => MessageSelector t
- filterMessage :: Typeable a => (a -> Bool) -> MessageSelector a
- selectMessageWith :: Typeable a => (a -> Maybe b) -> MessageSelector b
- selectDynamicMessage :: (StrictDynamic -> Maybe a) -> MessageSelector a
- selectAnyMessage :: MessageSelector StrictDynamic
- toExitRecovery :: Interrupt r -> ExitRecovery
- toExitSeverity :: Interrupt e -> ExitSeverity
- interruptToExit :: Interrupt Recoverable -> Interrupt NoRecovery
- isProcessDownInterrupt :: Maybe ProcessId -> Interrupt r -> Bool
- provideInterruptsShutdown :: forall e a. Eff (Processes e) a -> Eff (SafeProcesses e) a
- handleInterrupts :: (HasCallStack, Member Interrupts r) => (Interrupt Recoverable -> Eff r a) -> Eff r a -> Eff r a
- tryUninterrupted :: (HasCallStack, Member Interrupts r) => Eff r a -> Eff r (Either (Interrupt Recoverable) a)
- logInterrupts :: forall r. (Member Logs r, HasCallStack, Member Interrupts r) => Eff r () -> Eff r ()
- exitOnInterrupt :: (HasCallStack, HasProcesses r q) => Eff r a -> Eff r a
- provideInterrupts :: HasCallStack => Eff (Interrupts ': r) a -> Eff r (Either (Interrupt Recoverable) a)
- mergeEitherInterruptAndExitReason :: Either (Interrupt Recoverable) (Interrupt NoRecovery) -> Interrupt NoRecovery
- interrupt :: (HasCallStack, Member Interrupts r) => Interrupt Recoverable -> Eff r a
- isCrash :: Interrupt x -> Bool
- isRecoverable :: Interrupt x -> Bool
- fromSomeExitReason :: SomeExitReason -> Either (Interrupt NoRecovery) (Interrupt Recoverable)
- toCrashReason :: Interrupt x -> Maybe Text
- logProcessExit :: forall e x. (Member Logs e, HasCallStack) => Interrupt x -> Eff e ()
- executeAndResume :: forall q r v. (HasSafeProcesses r q, HasCallStack) => Process q (ResumeProcess v) -> Eff r (Either (Interrupt Recoverable) v)
- executeAndResumeOrExit :: forall r q v. (HasSafeProcesses r q, HasCallStack) => Process q (ResumeProcess v) -> Eff r v
- executeAndResumeOrThrow :: forall q r v. (HasProcesses r q, HasCallStack) => Process q (ResumeProcess v) -> Eff r v
- yieldProcess :: forall r q. (HasProcesses r q, HasCallStack) => Eff r ()
- sendMessage :: forall r q o. (HasProcesses r q, HasCallStack, Typeable o, NFData o) => ProcessId -> o -> Eff r ()
- sendAnyMessage :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> StrictDynamic -> Eff r ()
- sendShutdown :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Interrupt NoRecovery -> Eff r ()
- sendInterrupt :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Interrupt Recoverable -> Eff r ()
- spawn :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (Processes q) () -> Eff r ProcessId
- spawn_ :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (Processes q) () -> Eff r ()
- spawnLink :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (Processes q) () -> Eff r ProcessId
- spawnRaw :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (SafeProcesses q) () -> Eff r ProcessId
- spawnRaw_ :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (SafeProcesses q) () -> Eff r ()
- isProcessAlive :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r Bool
- getProcessState :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r (Maybe (ProcessTitle, ProcessDetails, ProcessState))
- updateProcessDetails :: forall r q. (HasCallStack, HasProcesses r q) => ProcessDetails -> Eff r ()
- receiveAnyMessage :: forall r q. (HasCallStack, HasProcesses r q) => Eff r StrictDynamic
- receiveSelectedMessage :: forall r q a. (HasCallStack, Show a, HasProcesses r q) => MessageSelector a -> Eff r a
- receiveMessage :: forall a r q. (HasCallStack, Typeable a, NFData a, Show a, HasProcesses r q) => Eff r a
- flushMessages :: forall r q. (HasCallStack, HasProcesses r q) => Eff r [StrictDynamic]
- receiveSelectedLoop :: forall r q a endOfLoopResult. (HasSafeProcesses r q, HasCallStack) => MessageSelector a -> (Either (Interrupt Recoverable) a -> Eff r (Maybe endOfLoopResult)) -> Eff r endOfLoopResult
- receiveAnyLoop :: forall r q endOfLoopResult. (HasSafeProcesses r q, HasCallStack) => (Either (Interrupt Recoverable) StrictDynamic -> Eff r (Maybe endOfLoopResult)) -> Eff r endOfLoopResult
- receiveLoop :: forall r q a endOfLoopResult. (HasSafeProcesses r q, HasCallStack, NFData a, Typeable a) => (Either (Interrupt Recoverable) a -> Eff r (Maybe endOfLoopResult)) -> Eff r endOfLoopResult
- self :: (HasCallStack, HasSafeProcesses r q) => Eff r ProcessId
- makeReference :: (HasCallStack, HasProcesses r q) => Eff r Int
- monitor :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r MonitorReference
- demonitor :: forall r q. (HasCallStack, HasProcesses r q) => MonitorReference -> Eff r ()
- withMonitor :: (HasCallStack, HasProcesses r q) => ProcessId -> (MonitorReference -> Eff r a) -> Eff r a
- receiveWithMonitor :: (HasCallStack, HasProcesses r q, Typeable a, Show a) => ProcessId -> MessageSelector a -> Eff r (Either ProcessDown a)
- becauseProcessIsDown :: ProcessDown -> Interrupt Recoverable
- selectProcessDown :: MonitorReference -> MessageSelector ProcessDown
- selectProcessDownByProcessId :: ProcessId -> MessageSelector ProcessDown
- linkProcess :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r ()
- unlinkProcess :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r ()
- exitBecause :: forall r q a. (HasCallStack, HasSafeProcesses r q) => Interrupt NoRecovery -> Eff r a
- exitNormally :: forall r q a. (HasCallStack, HasSafeProcesses r q) => Eff r a
- exitWithError :: forall r q a. (HasCallStack, HasSafeProcesses r q) => String -> Eff r a
- fromProcessId :: Iso' ProcessId Int
- type BaseEffects = Reader SchedulerState ': LoggingAndIo
- type HasBaseEffects r = (HasCallStack, Lifted IO r, BaseEffects <:: r)
- type Effects = Processes BaseEffects
- type SafeEffects = SafeProcesses BaseEffects
- defaultMain :: HasCallStack => Eff Effects () -> IO ()
- defaultMainWithLogWriter :: HasCallStack => LogWriter IO -> Eff Effects () -> IO ()
- schedule :: HasCallStack => Eff Effects () -> Eff LoggingAndIo ()
- data TimerElapsed
- data TimerReference
- data Timeout
- receiveAfter :: forall a r q. (Lifted IO q, HasCallStack, HasProcesses r q, Typeable a, NFData a, Show a) => Timeout -> Eff r (Maybe a)
- receiveSelectedAfter :: forall a r q. (Lifted IO q, HasCallStack, HasProcesses r q, Show a) => MessageSelector a -> Timeout -> Eff r (Either TimerElapsed a)
- receiveSelectedWithMonitorAfter :: forall a r q. (Lifted IO q, HasCallStack, HasProcesses r q, Show a) => ProcessId -> MessageSelector a -> Timeout -> Eff r (Either (Either ProcessDown TimerElapsed) a)
- selectTimerElapsed :: TimerReference -> MessageSelector TimerElapsed
- sendAfter :: forall r q message. (Lifted IO q, HasCallStack, HasProcesses r q, Typeable message, NFData message) => ProcessId -> Timeout -> (TimerReference -> message) -> Eff r TimerReference
- startTimer :: forall r q. (Lifted IO q, HasCallStack, HasProcesses r q) => Timeout -> Eff r TimerReference
- cancelTimer :: forall r q. (Lifted IO q, HasCallStack, HasProcesses r q) => TimerReference -> Eff r ()
- type family ProtocolReply (s :: Synchronicity) where ...
- data Synchronicity
- type TangiblePdu p r = (Typeable p, Typeable r, Tangible (Pdu p r), HasPdu p r)
- type Tangible i = (NFData i, Typeable i, Show i)
- class (Tangible (Pdu protocol reply), Typeable protocol, Typeable reply) => HasPdu (protocol :: Type) (reply :: Synchronicity) where
- data Pdu protocol reply
- deserializePdu :: Dynamic -> Maybe (Pdu protocol reply)
- newtype Endpoint protocol = Endpoint {}
- class (HasPdu protocol result, HasPdu embeddedProtocol result) => EmbedProtocol protocol embeddedProtocol (result :: Synchronicity) where
- fromEndpoint :: forall protocol protocol. Iso (Endpoint protocol) (Endpoint protocol) ProcessId ProcessId
- proxyAsEndpoint :: proxy protocol -> ProcessId -> Endpoint protocol
- asEndpoint :: forall protocol. ProcessId -> Endpoint protocol
- toEmbeddedEndpoint :: forall inner outer r. EmbedProtocol outer inner r => Endpoint outer -> Endpoint inner
- fromEmbeddedEndpoint :: forall outer inner r. EmbedProtocol outer inner r => Endpoint inner -> Endpoint outer
- type EndpointReader o = Reader (Endpoint o)
- type ServesProtocol o r q = (Typeable o, HasSafeProcesses r q, Member (EndpointReader o) r)
- cast :: forall destination protocol r q. (HasCallStack, HasProcesses r q, HasPdu destination Asynchronous, HasPdu protocol Asynchronous, EmbedProtocol destination protocol Asynchronous) => Endpoint destination -> Pdu protocol Asynchronous -> Eff r ()
- call :: forall result destination protocol r q. (HasProcesses r q, TangiblePdu destination (Synchronous result), TangiblePdu protocol (Synchronous result), EmbedProtocol destination protocol (Synchronous result), Tangible result, HasCallStack) => Endpoint destination -> Pdu protocol (Synchronous result) -> Eff r result
- callWithTimeout :: forall result destination protocol r q. (HasProcesses r q, TangiblePdu destination (Synchronous result), TangiblePdu protocol (Synchronous result), EmbedProtocol destination protocol (Synchronous result), Tangible result, Member Logs r, Lifted IO q, Lifted IO r, HasCallStack) => Endpoint destination -> Pdu protocol (Synchronous result) -> Timeout -> Eff r result
- runEndpointReader :: HasCallStack => Endpoint o -> Eff (EndpointReader o ': r) a -> Eff r a
- askEndpoint :: Member (EndpointReader o) e => Eff e (Endpoint o)
- callEndpointReader :: forall reply o r q. (ServesProtocol o r q, HasCallStack, Tangible reply, TangiblePdu o (Synchronous reply), Member Interrupts r) => Pdu o (Synchronous reply) -> Eff r reply
- castEndpointReader :: forall o r q. (ServesProtocol o r q, HasCallStack, Member Interrupts r, HasPdu o Asynchronous) => Pdu o Asynchronous -> Eff r ()
- callSingleton :: forall outer inner reply q e. (HasCallStack, EmbedProtocol outer inner (Synchronous reply), Member (EndpointReader outer) e, HasProcesses e q, TangiblePdu outer (Synchronous reply), TangiblePdu inner (Synchronous reply), Tangible reply) => Pdu inner (Synchronous reply) -> Eff e reply
- castSingleton :: forall outer inner q e. (HasCallStack, EmbedProtocol outer inner Asynchronous, Member (EndpointReader outer) e, HasProcesses e q, HasPdu outer Asynchronous, HasPdu inner Asynchronous) => Pdu inner Asynchronous -> Eff e ()
- newtype ReplyTarget p r = MkReplyTarget (Arg (RequestOrigin p r) (Serializer (Reply p r)))
- data RequestOrigin (proto :: Type) reply = RequestOrigin {}
- data Reply protocol reply where
- data Request protocol where
- Call :: forall protocol reply. (Tangible reply, TangiblePdu protocol (Synchronous reply)) => RequestOrigin protocol reply -> Pdu protocol (Synchronous reply) -> Request protocol
- Cast :: forall protocol. (TangiblePdu protocol Asynchronous, NFData (Pdu protocol Asynchronous)) => Pdu protocol Asynchronous -> Request protocol
- makeRequestOrigin :: (Typeable r, NFData r, HasProcesses e q0) => Eff e (RequestOrigin p r)
- toEmbeddedOrigin :: forall outer inner reply. EmbedProtocol outer inner (Synchronous reply) => RequestOrigin outer reply -> RequestOrigin inner reply
- embedRequestOrigin :: forall outer inner reply. EmbedProtocol outer inner (Synchronous reply) => RequestOrigin inner reply -> RequestOrigin outer reply
- embedReplySerializer :: forall outer inner reply. EmbedProtocol outer inner (Synchronous reply) => Serializer (Reply outer reply) -> Serializer (Reply inner reply)
- sendReply :: (HasProcesses eff q, Tangible reply, Typeable protocol) => ReplyTarget protocol reply -> reply -> Eff eff ()
- replyTarget :: Serializer (Reply p reply) -> RequestOrigin p reply -> ReplyTarget p reply
- replyTargetOrigin :: Lens' (ReplyTarget p reply) (RequestOrigin p reply)
- replyTargetSerializer :: Lens' (ReplyTarget p reply) (Serializer (Reply p reply))
- embeddedReplyTarget :: EmbedProtocol outer inner (Synchronous reply) => Serializer (Reply outer reply) -> RequestOrigin outer reply -> ReplyTarget inner reply
- toEmbeddedReplyTarget :: EmbedProtocol outer inner (Synchronous reply) => ReplyTarget outer reply -> ReplyTarget inner reply
- data family Pdu protocol reply
- type ObserverRegistryState event = State (ObserverRegistry event)
- data ObserverRegistry (event :: Type) = MkObserverRegistry {
- _observerRegistry :: Map ProcessId (ObservationSink event)
- type CanObserve eventSink event = (Tangible event, EmbedProtocol eventSink (Observer event) Asynchronous)
- type IsObservable eventSource event = (Tangible event, EmbedProtocol eventSource (ObserverRegistry event) Asynchronous)
- data ObservationSink event
- newtype Observer event = MkObserver (Arg ProcessId (ObservationSink event))
- registerObserver :: forall event eventSink eventSource r q. (HasCallStack, HasProcesses r q, IsObservable eventSource event, CanObserve eventSink event) => Endpoint eventSource -> Endpoint eventSink -> Eff r ()
- forgetObserver :: forall event eventSink eventSource r q. (HasProcesses r q, HasCallStack, IsObservable eventSource event, CanObserve eventSink event) => Endpoint eventSource -> Endpoint eventSink -> Eff r ()
- forgetObserverUnsafe :: forall event eventSource r q. (HasProcesses r q, HasCallStack, IsObservable eventSource event) => Endpoint eventSource -> ProcessId -> Eff r ()
- observerRegistryHandlePdu :: forall event q r. (HasCallStack, Typeable event, HasProcesses r q, Member (ObserverRegistryState event) r, Member Logs r) => Pdu (ObserverRegistry event) Asynchronous -> Eff r ()
- observerRegistryRemoveProcess :: forall event q r. (HasCallStack, Typeable event, HasProcesses r q, Member (ObserverRegistryState event) r, Member Logs r) => ProcessId -> Eff r Bool
- evalObserverRegistryState :: HasCallStack => Eff (ObserverRegistryState event ': r) a -> Eff r a
- emptyObserverRegistry :: ObserverRegistry event
- observerRegistryNotify :: forall event r q. (HasProcesses r q, Member (ObserverRegistryState event) r, Tangible event, HasCallStack) => event -> Eff r ()
- module Control.Eff.Log
- module Control.Eff.LogWriter.Async
- module Control.Eff.LogWriter.Console
- module Control.Eff.LogWriter.File
- module Control.Eff.LogWriter.UDP
- module Control.Eff.LogWriter.Capture
- module Control.Eff.LogWriter.DebugTrace
- module Control.Eff.LogWriter.IO
- module Control.Eff.LogWriter.UnixSocket
- module Control.Eff.Loop
Concurrent Processes with Message Passing Concurrency
Each process is identified by a single process id, that stays constant throughout the life cycle of a process. Also, message sending relies on these values to address messages to processes.
Instances
Bounded ProcessId Source # | |
Enum ProcessId Source # | |
Defined in Control.Eff.Concurrent.Process succ :: ProcessId -> ProcessId # pred :: ProcessId -> ProcessId # fromEnum :: ProcessId -> Int # enumFrom :: ProcessId -> [ProcessId] # enumFromThen :: ProcessId -> ProcessId -> [ProcessId] # enumFromTo :: ProcessId -> ProcessId -> [ProcessId] # enumFromThenTo :: ProcessId -> ProcessId -> ProcessId -> [ProcessId] # | |
Eq ProcessId Source # | |
Integral ProcessId Source # | |
Defined in Control.Eff.Concurrent.Process | |
Num ProcessId Source # | |
Defined in Control.Eff.Concurrent.Process | |
Ord ProcessId Source # | |
Defined in Control.Eff.Concurrent.Process | |
Read ProcessId Source # | |
Real ProcessId Source # | |
Defined in Control.Eff.Concurrent.Process toRational :: ProcessId -> Rational # | |
Show ProcessId Source # | |
NFData ProcessId Source # | |
Defined in Control.Eff.Concurrent.Process |
data ProcessDown Source #
A monitored process exited. This message is sent to a process by the scheduler, when a process that was monitored died.
Since: 0.12.0
Instances
data MonitorReference Source #
A value that contains a unique reference of a process monitoring.
Since: 0.12.0
Instances
data SomeExitReason where Source #
An existential wrapper around Interrupt
SomeExitReason :: Interrupt x -> SomeExitReason |
Instances
Eq SomeExitReason Source # | |
Defined in Control.Eff.Concurrent.Process (==) :: SomeExitReason -> SomeExitReason -> Bool # (/=) :: SomeExitReason -> SomeExitReason -> Bool # | |
Ord SomeExitReason Source # | |
Defined in Control.Eff.Concurrent.Process compare :: SomeExitReason -> SomeExitReason -> Ordering # (<) :: SomeExitReason -> SomeExitReason -> Bool # (<=) :: SomeExitReason -> SomeExitReason -> Bool # (>) :: SomeExitReason -> SomeExitReason -> Bool # (>=) :: SomeExitReason -> SomeExitReason -> Bool # max :: SomeExitReason -> SomeExitReason -> SomeExitReason # min :: SomeExitReason -> SomeExitReason -> SomeExitReason # | |
Show SomeExitReason Source # | |
Defined in Control.Eff.Concurrent.Process showsPrec :: Int -> SomeExitReason -> ShowS # show :: SomeExitReason -> String # showList :: [SomeExitReason] -> ShowS # | |
NFData SomeExitReason Source # | |
Defined in Control.Eff.Concurrent.Process rnf :: SomeExitReason -> () # |
type Interrupts = Exc (Interrupt Recoverable) Source #
Exc
eptions containing Interrupt
s.
See handleInterrupts
, exitOnInterrupt
or provideInterrupts
type HasSafeProcesses e inner = SetMember Process (Process inner) e Source #
A constraint for an effect set that requires the presence of SafeProcesses
.
This constrains the effect list to look like this:
[e1 ... eN,
Process
[e(N+1) .. e(N+k)], e(N+1) .. e(N+k)]
It contrains e
to support the (only) Process
effect.
This is more relaxed that HasProcesses
since it does not require Interrupts
.
Since: 0.27.1
type SafeProcesses r = Process r ': r Source #
Cons Process
onto a list of effects. This is called SafeProcesses
because
the the actions cannot be interrupted in.
type HasProcesses e inner = (HasSafeProcesses e inner, Member Interrupts e) Source #
A constraint for an effect set that requires the presence of Processes
.
This constrains the effect list to look like this:
[e1 ... eN,
Interrupts
, Process
[e(N+1) .. e(N+k)], e(N+1) .. e(N+k)]
It contrains e
beyond HasSafeProcesses
to encompass Interrupts
.
Since: 0.27.1
type Processes e = Interrupts ': SafeProcesses e Source #
This adds a layer of the Interrupts
effect on top of Processes
type RecoverableInterrupt = Interrupt Recoverable Source #
Interrupt
s which are Recoverable
.
data Interrupt (t :: ExitRecovery) where Source #
A sum-type with reasons for why a process operation, such as receiving messages, is interrupted in the scheduling loop.
This includes errors, that can occur when scheduling messages.
Since: 0.23.0
NormalExitRequested :: Interrupt Recoverable | A process has finished a unit of work and might exit or work on
something else. This is primarily used for interrupting infinite
server loops, allowing for additional cleanup work before
exiting (e.g. with Since: 0.13.2 |
OtherProcessNotRunning :: ProcessId -> Interrupt Recoverable | A process that should be running was not running. |
TimeoutInterrupt :: String -> Interrupt Recoverable | A |
LinkedProcessCrashed :: ProcessId -> Interrupt Recoverable | A linked process is down |
ErrorInterrupt :: String -> Interrupt Recoverable | An exit reason that has an error message and is |
ExitNormally :: Interrupt NoRecovery | A process function returned or exited without any error. |
ExitUnhandledError :: Text -> Interrupt NoRecovery | An error causes the process to exit immediately.
For example an unexpected runtime exception was thrown, i.e. an exception
derived from |
ExitProcessCancelled :: Interrupt NoRecovery | A process shall exit immediately, without any cleanup was cancelled (e.g. killed, in |
Instances
data ExitSeverity Source #
This value indicates whether a process exited in way consistent with the planned behaviour or not.
Instances
data ExitRecovery Source #
This kind is used to indicate if a Interrupt
can be treated like
a short interrupt which can be handled or ignored.
Instances
data MessageSelector a Source #
A function that decided if the next message will be received by
ReceiveSelectedMessage
. It conveniently is an instance of
Alternative
so the message selector can be combined:
>
> selectInt :: MessageSelector Int
> selectInt = selectMessage
>
> selectString :: MessageSelector String
> selectString = selectMessage
>
> selectIntOrString :: MessageSelector (Either Int String)
> selectIntOrString =
> Left $ selectTimeout| Right $ selectString
Instances
data ResumeProcess v where Source #
Every Process
action returns it's actual result wrapped in this type. It
will allow to signal errors as well as pass on normal results such as
incoming messages.
Interrupted :: Interrupt Recoverable -> ResumeProcess v | The current operation of the process was interrupted with a
|
ResumeWith :: a -> ResumeProcess a | The process may resume to do work, using the given result. |
Instances
newtype Serializer message Source #
Serialize a message
into a StrictDynamic
value to be sent via sendAnyMessage
.
This indirection allows, among other things, the composition of
Server
s.
Since: 0.24.1
MkSerializer | |
|
Instances
Contravariant Serializer Source # | |
Defined in Control.Eff.Concurrent.Process contramap :: (a -> b) -> Serializer b -> Serializer a # (>$) :: b -> Serializer b -> Serializer a # | |
Typeable message => Show (Serializer message) Source # | |
Defined in Control.Eff.Concurrent.Process showsPrec :: Int -> Serializer message -> ShowS # show :: Serializer message -> String # showList :: [Serializer message] -> ShowS # | |
NFData (Serializer message) Source # | |
Defined in Control.Eff.Concurrent.Process rnf :: Serializer message -> () # |
data StrictDynamic Source #
Data flows between Process
es via these messages.
This is just a newtype wrapper around Dynamic
.
The reason this type exists is to force construction through the code in this
module, which always evaluates a message to normal form before
sending it to another process.
Since: 0.22.0
Instances
Show StrictDynamic Source # | |
Defined in Control.Eff.Concurrent.Process showsPrec :: Int -> StrictDynamic -> ShowS # show :: StrictDynamic -> String # showList :: [StrictDynamic] -> ShowS # | |
NFData StrictDynamic Source # | |
Defined in Control.Eff.Concurrent.Process rnf :: StrictDynamic -> () # |
newtype ProcessDetails Source #
A multi-line text describing the current state of a process for debugging purposes.
Since: 0.24.1
Instances
newtype ProcessTitle Source #
A short title for a Process
for logging purposes.
Since: 0.24.1
Instances
data Process (r :: [Type -> Type]) b where Source #
The process effect is the basis for message passing concurrency. This effect describes an interface for concurrent, communicating isolated processes identified uniquely by a process-id.
Processes can raise exceptions that can be caught, exit gracefully or with an error, or be killed by other processes, with the option of ignoring the shutdown request.
Process Scheduling is implemented in different modules. All scheduler implementations should follow some basic rules:
- fair scheduling
- sending a message does not block
- receiving a message does block
- spawning a child blocks only a very moment
- a newly spawned process shall be scheduled before the parent process after
- the spawnRaw
- when the first process exists, all process should be killed immediately
FlushMessages :: Process r (ResumeProcess [StrictDynamic]) | Remove all messages from the process' message queue |
YieldProcess :: Process r (ResumeProcess ()) | In cooperative schedulers, this will give processing time to the scheduler. Every other operation implicitly serves the same purpose. Since: 0.12.0 |
SelfPid :: Process r (ResumeProcess ProcessId) | Return the current |
Spawn :: ProcessTitle -> Eff (Process r ': r) () -> Process r (ResumeProcess ProcessId) | Start a new process, the new process will execute an effect, the function
will return immediately with a |
SpawnLink :: ProcessTitle -> Eff (Process r ': r) () -> Process r (ResumeProcess ProcessId) | Start a new process, and Since: 0.12.0 |
Shutdown :: Interrupt NoRecovery -> Process r a | Shutdown the process; irregardless of the exit reason, this function never returns, |
SendShutdown :: ProcessId -> Interrupt NoRecovery -> Process r (ResumeProcess ()) | Shutdown another process immediately, the other process has no way of handling this! |
SendInterrupt :: ProcessId -> Interrupt Recoverable -> Process r (ResumeProcess ()) | Request that another a process interrupts. The targeted process is interrupted
and gets an |
SendMessage :: ProcessId -> StrictDynamic -> Process r (ResumeProcess ()) | Send a message to a process addressed by the |
ReceiveSelectedMessage :: forall r a. MessageSelector a -> Process r (ResumeProcess a) | Receive a message that matches a criteria.
This should block until an a message was received. The message is returned
as a |
MakeReference :: Process r (ResumeProcess Int) | Generate a unique |
Monitor :: ProcessId -> Process r (ResumeProcess MonitorReference) | Monitor another process. When the monitored process exits a
Since: 0.12.0 |
Demonitor :: MonitorReference -> Process r (ResumeProcess ()) | Remove a monitor. Since: 0.12.0 |
Link :: ProcessId -> Process r (ResumeProcess ()) | Connect the calling process to another process, such that
if one of the processes crashes (i.e. Since: 0.12.0 |
Unlink :: ProcessId -> Process r (ResumeProcess ()) | Unlink the calling process from the other process. Since: 0.12.0 |
UpdateProcessDetails :: ProcessDetails -> Process r (ResumeProcess ()) | Update the |
GetProcessState :: ProcessId -> Process r (ResumeProcess (Maybe (ProcessTitle, ProcessDetails, ProcessState))) | Get the |
Instances
fromProcessTitle :: Lens' ProcessTitle Text Source #
An isomorphism lens for the ProcessTitle
Since: 0.24.1
fromProcessDetails :: Lens' ProcessDetails Text Source #
An isomorphism lens for the ProcessDetails
Since: 0.24.1
toStrictDynamic :: (Typeable a, NFData a) => a -> StrictDynamic Source #
Deeply evaluate the given value and wrap it into a StrictDynamic
.
Since: 0.22.0
fromStrictDynamic :: Typeable a => StrictDynamic -> Maybe a Source #
Convert a StrictDynamic
back to a value.
Since: 0.22.0
unwrapStrictDynamic :: StrictDynamic -> Dynamic Source #
Convert a StrictDynamic
back to an unwrapped Dynamic
.
Since: 0.22.0
selectMessage :: Typeable t => MessageSelector t Source #
Create a message selector for a value that can be obtained by fromStrictDynamic
.
Since: 0.9.1
filterMessage :: Typeable a => (a -> Bool) -> MessageSelector a Source #
Create a message selector from a predicate.
Since: 0.9.1
selectMessageWith :: Typeable a => (a -> Maybe b) -> MessageSelector b Source #
Select a message of type a
and apply the given function to it.
If the function returns Just
The ReceiveSelectedMessage
function will
return the result (sans Maybe
).
Since: 0.9.1
selectDynamicMessage :: (StrictDynamic -> Maybe a) -> MessageSelector a Source #
Create a message selector.
Since: 0.9.1
selectAnyMessage :: MessageSelector StrictDynamic Source #
Create a message selector that will match every message. This is lazy
because the result is not force
ed.
Since: 0.9.1
toExitRecovery :: Interrupt r -> ExitRecovery Source #
Get the ExitRecovery
toExitSeverity :: Interrupt e -> ExitSeverity Source #
Get the ExitSeverity
of a Interrupt
.
interruptToExit :: Interrupt Recoverable -> Interrupt NoRecovery Source #
Return either ExitNormally
or interruptToExit
from a Recoverable
Interrupt
;
If the Interrupt
is NormalExitRequested
then return ExitNormally
isProcessDownInterrupt :: Maybe ProcessId -> Interrupt r -> Bool Source #
A predicate for linked process crashes.
provideInterruptsShutdown :: forall e a. Eff (Processes e) a -> Eff (SafeProcesses e) a Source #
Handle all Interrupt
s of an Processes
by
wrapping them up in interruptToExit
and then do a process Shutdown
.
handleInterrupts :: (HasCallStack, Member Interrupts r) => (Interrupt Recoverable -> Eff r a) -> Eff r a -> Eff r a Source #
Handle Interrupt
s arising during process operations, e.g.
when a linked process crashes while we wait in a receiveSelectedMessage
via a call to interrupt
.
tryUninterrupted :: (HasCallStack, Member Interrupts r) => Eff r a -> Eff r (Either (Interrupt Recoverable) a) Source #
Like handleInterrupts
, but instead of passing the Interrupt
to a handler function, Either
is returned.
Since: 0.13.2
logInterrupts :: forall r. (Member Logs r, HasCallStack, Member Interrupts r) => Eff r () -> Eff r () Source #
Handle interrupts by logging them with logProcessExit
and otherwise
ignoring them.
exitOnInterrupt :: (HasCallStack, HasProcesses r q) => Eff r a -> Eff r a Source #
Handle Interrupt
s arising during process operations, e.g.
when a linked process crashes while we wait in a receiveSelectedMessage
via a call to interrupt
.
provideInterrupts :: HasCallStack => Eff (Interrupts ': r) a -> Eff r (Either (Interrupt Recoverable) a) Source #
Handle Interrupt
s arising during process operations, e.g.
when a linked process crashes while we wait in a receiveSelectedMessage
via a call to interrupt
.
mergeEitherInterruptAndExitReason :: Either (Interrupt Recoverable) (Interrupt NoRecovery) -> Interrupt NoRecovery Source #
Wrap all (left) Interrupt
s into interruptToExit
and
return the (right) NoRecovery
Interrupt
s as is.
interrupt :: (HasCallStack, Member Interrupts r) => Interrupt Recoverable -> Eff r a Source #
Throw an Interrupt
, can be handled by handleInterrupts
or
exitOnInterrupt
or provideInterrupts
.
isCrash :: Interrupt x -> Bool Source #
A predicate for crashes. A crash happens when a process exits
with an Interrupt
other than ExitNormally
isRecoverable :: Interrupt x -> Bool Source #
A predicate for recoverable exit reasons. This predicate defines the
exit reasons which functions such as executeAndResume
fromSomeExitReason :: SomeExitReason -> Either (Interrupt NoRecovery) (Interrupt Recoverable) Source #
Partition a SomeExitReason
back into either a NoRecovery
or a Recoverable
Interrupt
toCrashReason :: Interrupt x -> Maybe Text Source #
Print a Interrupt
to Just
a formatted String
when isCrash
is True
.
This can be useful in combination with view patterns, e.g.:
logCrash :: Interrupt -> Eff e () logCrash (toCrashReason -> Just reason) = logError reason logCrash _ = return ()
Though this can be improved to:
logCrash = traverse_ logError . toCrashReason
logProcessExit :: forall e x. (Member Logs e, HasCallStack) => Interrupt x -> Eff e () Source #
Log the Interrupt
s
executeAndResume :: forall q r v. (HasSafeProcesses r q, HasCallStack) => Process q (ResumeProcess v) -> Eff r (Either (Interrupt Recoverable) v) Source #
Execute a and action and return the result;
if the process is interrupted by an error or exception, or an explicit
shutdown from another process, or through a crash of a linked process, i.e.
whenever the exit reason satisfies isRecoverable
, return the exit reason.
executeAndResumeOrExit :: forall r q v. (HasSafeProcesses r q, HasCallStack) => Process q (ResumeProcess v) -> Eff r v Source #
Execute a Process
action and resume the process, exit
the process when an Interrupts
was raised. Use executeAndResume
to catch
interrupts.
executeAndResumeOrThrow :: forall q r v. (HasProcesses r q, HasCallStack) => Process q (ResumeProcess v) -> Eff r v Source #
Execute a Process
action and resume the process, exit
the process when an Interrupts
was raised. Use executeAndResume
to catch
interrupts.
yieldProcess :: forall r q. (HasProcesses r q, HasCallStack) => Eff r () Source #
Use executeAndResumeOrExit
to execute YieldProcess
. Refer to YieldProcess
for more information.
sendMessage :: forall r q o. (HasProcesses r q, HasCallStack, Typeable o, NFData o) => ProcessId -> o -> Eff r () Source #
Send a message to a process addressed by the ProcessId
.
See SendMessage
.
The message will be reduced to normal form (rnf
) by/in the caller process.
sendAnyMessage :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> StrictDynamic -> Eff r () Source #
Send a Dynamic
value to a process addressed by the ProcessId
.
See SendMessage
.
sendShutdown :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Interrupt NoRecovery -> Eff r () Source #
Exit a process addressed by the ProcessId
. The process will exit,
it might do some cleanup, but is ultimately unrecoverable.
See SendShutdown
.
sendInterrupt :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Interrupt Recoverable -> Eff r () Source #
Interrupts a process addressed by the ProcessId
. The process might exit,
or it may continue.
| Like sendInterrupt
, but also return True
iff the process to exit exists.
spawn :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (Processes q) () -> Eff r ProcessId Source #
Start a new process, the new process will execute an effect, the function
will return immediately with a ProcessId
. If the new process is
interrupted, the process will Shutdown
with the Interrupt
wrapped in interruptToExit
. For specific use cases it might be better to use
spawnRaw
.
spawn_ :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (Processes q) () -> Eff r () Source #
Like spawn
but return ()
.
spawnLink :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (Processes q) () -> Eff r ProcessId Source #
Start a new process, and immediately link to it.
Since: 0.12.0
spawnRaw :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (SafeProcesses q) () -> Eff r ProcessId Source #
Start a new process, the new process will execute an effect, the function
will return immediately with a ProcessId
. The spawned process has only the
raw SafeProcesses
effects. For non-library code spawn
might be better
suited.
spawnRaw_ :: forall r q. (HasCallStack, HasProcesses r q) => ProcessTitle -> Eff (SafeProcesses q) () -> Eff r () Source #
Like spawnRaw
but return ()
.
isProcessAlive :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r Bool Source #
Return True
if the process is alive.
Since: 0.12.0
getProcessState :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r (Maybe (ProcessTitle, ProcessDetails, ProcessState)) Source #
Return the ProcessTitle
, ProcessDetails
and ProcessState
,
for the given process, if the process is alive.
Since: 0.24.1
updateProcessDetails :: forall r q. (HasCallStack, HasProcesses r q) => ProcessDetails -> Eff r () Source #
Replace the ProcessDetails
of the process.
Since: 0.24.1
receiveAnyMessage :: forall r q. (HasCallStack, HasProcesses r q) => Eff r StrictDynamic Source #
Block until a message was received.
See ReceiveSelectedMessage
for more documentation.
receiveSelectedMessage :: forall r q a. (HasCallStack, Show a, HasProcesses r q) => MessageSelector a -> Eff r a Source #
Block until a message was received, that is not Nothing
after applying
a callback to it.
See ReceiveSelectedMessage
for more documentation.
receiveMessage :: forall a r q. (HasCallStack, Typeable a, NFData a, Show a, HasProcesses r q) => Eff r a Source #
Receive and cast the message to some Typeable
instance.
See ReceiveSelectedMessage
for more documentation.
This will wait for a message of the return type using receiveSelectedMessage
flushMessages :: forall r q. (HasCallStack, HasProcesses r q) => Eff r [StrictDynamic] Source #
Remove and return all messages currently enqueued in the process message queue.
Since: 0.12.0
receiveSelectedLoop :: forall r q a endOfLoopResult. (HasSafeProcesses r q, HasCallStack) => MessageSelector a -> (Either (Interrupt Recoverable) a -> Eff r (Maybe endOfLoopResult)) -> Eff r endOfLoopResult Source #
Enter a loop to receive messages and pass them to a callback, until the
function returns Just
a result.
Only the messages of the given type will be received.
If the process is interrupted by an exception of by a SendShutdown
from
another process, with an exit reason that satisfies isRecoverable
, then
the callback will be invoked with
, otherwise the
process will be exited with the same reason using Left
Interrupt
exitBecause
.
See also ReceiveSelectedMessage
for more documentation.
receiveAnyLoop :: forall r q endOfLoopResult. (HasSafeProcesses r q, HasCallStack) => (Either (Interrupt Recoverable) StrictDynamic -> Eff r (Maybe endOfLoopResult)) -> Eff r endOfLoopResult Source #
Like receiveSelectedLoop
but not selective.
See also selectAnyMessage
, receiveSelectedLoop
.
receiveLoop :: forall r q a endOfLoopResult. (HasSafeProcesses r q, HasCallStack, NFData a, Typeable a) => (Either (Interrupt Recoverable) a -> Eff r (Maybe endOfLoopResult)) -> Eff r endOfLoopResult Source #
Like receiveSelectedLoop
but refined to casting to a specific Typeable
using selectMessage
.
self :: (HasCallStack, HasSafeProcesses r q) => Eff r ProcessId Source #
Returns the ProcessId
of the current process.
makeReference :: (HasCallStack, HasProcesses r q) => Eff r Int Source #
Generate a unique Int
for the current process.
monitor :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r MonitorReference Source #
Monitor another process. When the monitored process exits a
ProcessDown
is sent to the calling process.
The return value is a unique identifier for that monitor.
There can be multiple monitors on the same process,
and a message for each will be sent.
If the process is already dead, the ProcessDown
message
will be sent immediately, without exit reason
Since: 0.12.0
demonitor :: forall r q. (HasCallStack, HasProcesses r q) => MonitorReference -> Eff r () Source #
Remove a monitor created with monitor
.
Since: 0.12.0
withMonitor :: (HasCallStack, HasProcesses r q) => ProcessId -> (MonitorReference -> Eff r a) -> Eff r a Source #
receiveWithMonitor :: (HasCallStack, HasProcesses r q, Typeable a, Show a) => ProcessId -> MessageSelector a -> Eff r (Either ProcessDown a) Source #
A MessageSelector
for receiving either a monitor of the
given process or another message.
Since: 0.12.0
becauseProcessIsDown :: ProcessDown -> Interrupt Recoverable Source #
Make an Interrupt
for a ProcessDown
message.
For example: doSomething >>= either (interrupt . becauseProcessIsDown) return
Since: 0.12.0
selectProcessDown :: MonitorReference -> MessageSelector ProcessDown Source #
A MessageSelector
for the ProcessDown
message of a specific
process.
The parameter is the value obtained by monitor
.
Since: 0.12.0
selectProcessDownByProcessId :: ProcessId -> MessageSelector ProcessDown Source #
A MessageSelector
for the ProcessDown
message. of a specific
process.
In contrast to selectProcessDown
this function matches the ProcessId
.
Since: 0.28.0
linkProcess :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r () Source #
Connect the calling process to another process, such that
if one of the processes crashes (i.e. isCrash
returns True
), the other
is shutdown with the Interrupt
LinkedProcessCrashed
.
Since: 0.12.0
unlinkProcess :: forall r q. (HasCallStack, HasProcesses r q) => ProcessId -> Eff r () Source #
Unlink the calling process from the other process.
Since: 0.12.0
exitBecause :: forall r q a. (HasCallStack, HasSafeProcesses r q) => Interrupt NoRecovery -> Eff r a Source #
Exit the process with a Interrupt
.
exitNormally :: forall r q a. (HasCallStack, HasSafeProcesses r q) => Eff r a Source #
Exit the process.
exitWithError :: forall r q a. (HasCallStack, HasSafeProcesses r q) => String -> Eff r a Source #
Exit the process with an error.
Scheduler Process Effect Handler
Concurrent Scheduler
type BaseEffects = Reader SchedulerState ': LoggingAndIo Source #
The concrete list of Eff
ects for this scheduler implementation.
Since: 0.25.0
type HasBaseEffects r = (HasCallStack, Lifted IO r, BaseEffects <:: r) Source #
Type class constraint to indicate that an effect union contains the effects required by every process and the scheduler implementation itself.
Since: 0.25.0
type Effects = Processes BaseEffects Source #
The Eff
ects for interruptable, concurrent processes, scheduled via forkIO
.
Since: 0.25.0
type SafeEffects = SafeProcesses BaseEffects Source #
The concrete list of Eff
ects of processes compatible with this scheduler.
This builds upon BaseEffects
.
Since: 0.25.0
defaultMain :: HasCallStack => Eff Effects () -> IO () Source #
Start the message passing concurrency system then execute a Process
on
top of BaseEffects
effect. All logging is sent to standard output.
defaultMainWithLogWriter :: HasCallStack => LogWriter IO -> Eff Effects () -> IO () Source #
Start the message passing concurrency system then execute a Process
on
top of BaseEffects
effect. All logging is sent to standard output.
schedule :: HasCallStack => Eff Effects () -> Eff LoggingAndIo () Source #
This is the main entry point to running a message passing concurrency
application. This function takes a Process
on top of the BaseEffects
effect for concurrent logging.
Timers and Timeouts
data TimerElapsed Source #
A value to be sent when timer started with startTimer
has elapsed.
Since: 0.12.0
Instances
Eq TimerElapsed Source # | |
Defined in Control.Eff.Concurrent.Process.Timer (==) :: TimerElapsed -> TimerElapsed -> Bool # (/=) :: TimerElapsed -> TimerElapsed -> Bool # | |
Ord TimerElapsed Source # | |
Defined in Control.Eff.Concurrent.Process.Timer compare :: TimerElapsed -> TimerElapsed -> Ordering # (<) :: TimerElapsed -> TimerElapsed -> Bool # (<=) :: TimerElapsed -> TimerElapsed -> Bool # (>) :: TimerElapsed -> TimerElapsed -> Bool # (>=) :: TimerElapsed -> TimerElapsed -> Bool # max :: TimerElapsed -> TimerElapsed -> TimerElapsed # min :: TimerElapsed -> TimerElapsed -> TimerElapsed # | |
Show TimerElapsed Source # | |
Defined in Control.Eff.Concurrent.Process.Timer showsPrec :: Int -> TimerElapsed -> ShowS # show :: TimerElapsed -> String # showList :: [TimerElapsed] -> ShowS # | |
NFData TimerElapsed Source # | |
Defined in Control.Eff.Concurrent.Process.Timer rnf :: TimerElapsed -> () # |
data TimerReference Source #
The reference to a timer started by startTimer
, required to stop
a timer via cancelTimer
.
Since: 0.12.0
Instances
A number of micro seconds.
Since: 0.12.0
Instances
Enum Timeout Source # | |
Eq Timeout Source # | |
Integral Timeout Source # | |
Defined in Control.Eff.Concurrent.Process.Timer | |
Num Timeout Source # | |
Ord Timeout Source # | |
Defined in Control.Eff.Concurrent.Process.Timer | |
Real Timeout Source # | |
Defined in Control.Eff.Concurrent.Process.Timer toRational :: Timeout -> Rational # | |
Show Timeout Source # | |
NFData Timeout Source # | |
Defined in Control.Eff.Concurrent.Process.Timer |
receiveAfter :: forall a r q. (Lifted IO q, HasCallStack, HasProcesses r q, Typeable a, NFData a, Show a) => Timeout -> Eff r (Maybe a) Source #
Wait for a message of the given type for the given time. When no message
arrives in time, return Nothing
. This is based on
receiveSelectedAfter
.
Since: 0.12.0
receiveSelectedAfter :: forall a r q. (Lifted IO q, HasCallStack, HasProcesses r q, Show a) => MessageSelector a -> Timeout -> Eff r (Either TimerElapsed a) Source #
Wait for a message of the given type for the given time. When no message
arrives in time, return Left
TimerElapsed
. This is based on
selectTimerElapsed
and startTimer
.
Since: 0.12.0
receiveSelectedWithMonitorAfter :: forall a r q. (Lifted IO q, HasCallStack, HasProcesses r q, Show a) => ProcessId -> MessageSelector a -> Timeout -> Eff r (Either (Either ProcessDown TimerElapsed) a) Source #
Like receiveWithMonitor
combined with receiveSelectedAfter
.
Since: 0.22.0
selectTimerElapsed :: TimerReference -> MessageSelector TimerElapsed Source #
A MessageSelector
matching TimerElapsed
messages created by
startTimer
.
Since: 0.12.0
sendAfter :: forall r q message. (Lifted IO q, HasCallStack, HasProcesses r q, Typeable message, NFData message) => ProcessId -> Timeout -> (TimerReference -> message) -> Eff r TimerReference Source #
Send a message to a given process after waiting. The message is created by
applying the function parameter to the TimerReference
, such that the
message can directly refer to the timer.
Since: 0.12.0
startTimer :: forall r q. (Lifted IO q, HasCallStack, HasProcesses r q) => Timeout -> Eff r TimerReference Source #
Start a new timer, after the time has elapsed, TimerElapsed
is sent to
calling process. The message also contains the TimerReference
returned by
this function. Use cancelTimer
to cancel the timer. Use
selectTimerElapsed
to receive the message using receiveSelectedMessage
.
To receive messages with guarded with a timeout see receiveAfter
.
Since: 0.12.0
cancelTimer :: forall r q. (Lifted IO q, HasCallStack, HasProcesses r q) => TimerReference -> Eff r () Source #
Cancel a timer started with startTimer
.
Since: 0.12.0
Data Types and Functions for APIs (aka Protocols)
type family ProtocolReply (s :: Synchronicity) where ... Source #
This type function takes an Pdu
and analysis the reply type, i.e. the Synchronicity
and evaluates to either t
for an
Pdu x (
or to '()' for an Synchronous
t)Pdu x
.Asynchronous
Since: 0.24.0
ProtocolReply (Synchronous t) = t | |
ProtocolReply Asynchronous = () |
data Synchronicity Source #
The (promoted) constructors of this type specify (at the type level) the
reply behavior of a specific constructor of an Pdu
instance.
Synchronous Type | Specify that handling a request is a blocking operation
with a specific return type, e.g. |
Asynchronous | Non-blocking, asynchronous, request handling |
type TangiblePdu p r = (Typeable p, Typeable r, Tangible (Pdu p r), HasPdu p r) Source #
A Constraint
that bundles the requirements for the
Pdu
values of a protocol.
This ensures that Pdu
s can be strictly and deeply evaluated and shown
such that for example logging is possible.
Since: 0.24.0
class (Tangible (Pdu protocol reply), Typeable protocol, Typeable reply) => HasPdu (protocol :: Type) (reply :: Synchronicity) where Source #
This type class and the associated data family defines the protocol data units (PDU) of a protocol.
A Protocol in the sense of a communication interface description between processes.
The first parameter is usually a user defined type that identifies the
protocol that uses the Pdu
s are. It maybe a phantom type.
The second parameter specifies if a specific constructor of an (GADT-like)
Pdu
instance is Synchronous
, i.e. returns a result and blocks the caller
or if it is Asynchronous
Example:
data BookShop deriving Typeable instance Typeable r => HasPdu BookShop r where data instance Pdu BookShop r where RentBook :: BookId -> Pdu BookShop ('Synchronous (Either RentalError RentalId)) BringBack :: RentalId -> Pdu BookShop 'Asynchronous deriving Typeable type BookId = Int type RentalId = Int type RentalError = String
Since: 0.25.1
Nothing
deserializePdu :: Dynamic -> Maybe (Pdu protocol reply) Source #
deserializePdu :: Typeable (Pdu protocol reply) => Dynamic -> Maybe (Pdu protocol reply) Source #
Instances
(NFData (Pdu (Sup p) r), Show (Pdu (Sup p) r), Typeable p, Typeable r) => HasPdu (Sup p) r Source # | |
(Tangible event, Typeable r) => HasPdu (ObserverRegistry event) r Source # | |
Defined in Control.Eff.Concurrent.Protocol.Observer data Pdu (ObserverRegistry event) r :: Type Source # deserializePdu :: Dynamic -> Maybe (Pdu (ObserverRegistry event) r) Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r) => HasPdu (a1, a2) r Source # | |
(Typeable r, Tangible event) => HasPdu (Observer event) r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r) => HasPdu (a1, a2, a3) r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r) => HasPdu (a1, a2, a3, a4) r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r, HasPdu a5 r) => HasPdu (a1, a2, a3, a4, a5) r Source # | |
newtype Endpoint protocol Source #
A server process for protocol.
Protocols are represented by phantom types, which are used in different places to index type families and type class instances.
A Process
can send and receive any messages. An Endpoint
wraps around a ProcessId
and carries a phantom type to indicate
the kinds of messages accepted by the process.
As a metaphor, communication between processes can be thought of waiting for and sending protocol data units belonging to some protocol.
Instances
Eq (Endpoint protocol) Source # | |
Ord (Endpoint protocol) Source # | |
Defined in Control.Eff.Concurrent.Protocol compare :: Endpoint protocol -> Endpoint protocol -> Ordering # (<) :: Endpoint protocol -> Endpoint protocol -> Bool # (<=) :: Endpoint protocol -> Endpoint protocol -> Bool # (>) :: Endpoint protocol -> Endpoint protocol -> Bool # (>=) :: Endpoint protocol -> Endpoint protocol -> Bool # max :: Endpoint protocol -> Endpoint protocol -> Endpoint protocol # min :: Endpoint protocol -> Endpoint protocol -> Endpoint protocol # | |
Typeable protocol => Show (Endpoint protocol) Source # | |
NFData (Endpoint protocol) Source # | |
Defined in Control.Eff.Concurrent.Protocol | |
type ToPretty (Endpoint a :: Type) Source # | |
class (HasPdu protocol result, HasPdu embeddedProtocol result) => EmbedProtocol protocol embeddedProtocol (result :: Synchronicity) where Source #
A class for Pdu
instances that embed other Pdu
.
A Prism
for the embedded Pdu
is the center of this class
Laws: embeddedPdu = prism' embedPdu fromPdu
Since: 0.24.0
Nothing
embeddedPdu :: Prism' (Pdu protocol result) (Pdu embeddedProtocol result) Source #
embedPdu :: Pdu embeddedProtocol result -> Pdu protocol result Source #
fromPdu :: Pdu protocol result -> Maybe (Pdu embeddedProtocol result) Source #
Instances
HasPdu a r => EmbedProtocol a a r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r) => EmbedProtocol (a1, a2) a2 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r) => EmbedProtocol (a1, a2) a1 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r) => EmbedProtocol (a1, a2, a3) a3 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r) => EmbedProtocol (a1, a2, a3) a2 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r) => EmbedProtocol (a1, a2, a3) a1 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r) => EmbedProtocol (a1, a2, a3, a4) a4 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r) => EmbedProtocol (a1, a2, a3, a4) a3 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r) => EmbedProtocol (a1, a2, a3, a4) a2 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r) => EmbedProtocol (a1, a2, a3, a4) a1 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r, HasPdu a5 r) => EmbedProtocol (a1, a2, a3, a4, a5) a5 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r, HasPdu a5 r) => EmbedProtocol (a1, a2, a3, a4, a5) a4 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r, HasPdu a5 r) => EmbedProtocol (a1, a2, a3, a4, a5) a3 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r, HasPdu a5 r) => EmbedProtocol (a1, a2, a3, a4, a5) a2 r Source # | |
(Typeable r, HasPdu a1 r, HasPdu a2 r, HasPdu a3 r, HasPdu a4 r, HasPdu a5 r) => EmbedProtocol (a1, a2, a3, a4, a5) a1 r Source # | |
fromEndpoint :: forall protocol protocol. Iso (Endpoint protocol) (Endpoint protocol) ProcessId ProcessId Source #
proxyAsEndpoint :: proxy protocol -> ProcessId -> Endpoint protocol Source #
asEndpoint :: forall protocol. ProcessId -> Endpoint protocol Source #
toEmbeddedEndpoint :: forall inner outer r. EmbedProtocol outer inner r => Endpoint outer -> Endpoint inner Source #
Convert an Endpoint
to an endpoint for an embedded protocol.
See EmbedProtocol
, fromEmbeddedEndpoint
.
Since: 0.25.1
fromEmbeddedEndpoint :: forall outer inner r. EmbedProtocol outer inner r => Endpoint inner -> Endpoint outer Source #
Convert an Endpoint
to an endpoint for a server, that embeds the protocol.
See EmbedProtocol
, toEmbeddedEndpoint
.
Since: 0.25.1
Client Functions for Consuming APIs
type EndpointReader o = Reader (Endpoint o) Source #
The reader effect for ProcessId
s for Pdu
s, see runEndpointReader
type ServesProtocol o r q = (Typeable o, HasSafeProcesses r q, Member (EndpointReader o) r) Source #
cast :: forall destination protocol r q. (HasCallStack, HasProcesses r q, HasPdu destination Asynchronous, HasPdu protocol Asynchronous, EmbedProtocol destination protocol Asynchronous) => Endpoint destination -> Pdu protocol Asynchronous -> Eff r () Source #
Send a request Pdu
that has no reply and return immediately.
The type signature enforces that the corresponding Pdu
clause is
Asynchronous
. The operation never fails, if it is important to know if the
message was delivered, use call
instead.
The message will be reduced to normal form (rnf
) in the caller process.
call :: forall result destination protocol r q. (HasProcesses r q, TangiblePdu destination (Synchronous result), TangiblePdu protocol (Synchronous result), EmbedProtocol destination protocol (Synchronous result), Tangible result, HasCallStack) => Endpoint destination -> Pdu protocol (Synchronous result) -> Eff r result Source #
Send a request Pdu
and wait for the server to return a result value.
The type signature enforces that the corresponding Pdu
clause is
Synchronous
.
Always prefer callWithTimeout
over call
callWithTimeout :: forall result destination protocol r q. (HasProcesses r q, TangiblePdu destination (Synchronous result), TangiblePdu protocol (Synchronous result), EmbedProtocol destination protocol (Synchronous result), Tangible result, Member Logs r, Lifted IO q, Lifted IO r, HasCallStack) => Endpoint destination -> Pdu protocol (Synchronous result) -> Timeout -> Eff r result Source #
Send an request Pdu
and wait for the server to return a result value.
The type signature enforces that the corresponding Pdu
clause is
Synchronous
.
If the server that was called dies, this function interrupts the
process with ProcessDown
.
If the server takes longer to reply than the given timeout, this
function interrupts the process with TimeoutInterrupt
.
Always prefer this function over call
Since: 0.22.0
runEndpointReader :: HasCallStack => Endpoint o -> Eff (EndpointReader o ': r) a -> Eff r a Source #
Run a reader effect that contains the one server handling a specific
Pdu
instance.
askEndpoint :: Member (EndpointReader o) e => Eff e (Endpoint o) Source #
Get the Endpoint
registered with runEndpointReader
.
callEndpointReader :: forall reply o r q. (ServesProtocol o r q, HasCallStack, Tangible reply, TangiblePdu o (Synchronous reply), Member Interrupts r) => Pdu o (Synchronous reply) -> Eff r reply Source #
Like call
but take the Endpoint
from the reader provided by
runEndpointReader
.
When working with an embedded Pdu
use callSingleton
.
castEndpointReader :: forall o r q. (ServesProtocol o r q, HasCallStack, Member Interrupts r, HasPdu o Asynchronous) => Pdu o Asynchronous -> Eff r () Source #
Like cast
but take the Endpoint
from the reader provided by
runEndpointReader
.
When working with an embedded Pdu
use castSingleton
.
callSingleton :: forall outer inner reply q e. (HasCallStack, EmbedProtocol outer inner (Synchronous reply), Member (EndpointReader outer) e, HasProcesses e q, TangiblePdu outer (Synchronous reply), TangiblePdu inner (Synchronous reply), Tangible reply) => Pdu inner (Synchronous reply) -> Eff e reply Source #
Like callEndpointReader
, uses embedPdu
to embed the value.
This function makes use of AmbigousTypes and TypeApplications.
When not working with an embedded Pdu
use callEndpointReader
.
Since: 0.25.1
castSingleton :: forall outer inner q e. (HasCallStack, EmbedProtocol outer inner Asynchronous, Member (EndpointReader outer) e, HasProcesses e q, HasPdu outer Asynchronous, HasPdu inner Asynchronous) => Pdu inner Asynchronous -> Eff e () Source #
Like castEndpointReader
, but uses embedPdu
to embed the value.
This function makes use of AmbigousTypes and TypeApplications.
When not working with an embedded Pdu
use castEndpointReader
.
Since: 0.25.1
Protocol-Server Support Functions for building protocol servers
newtype ReplyTarget p r Source #
Target of a Call
reply.
This combines a RequestOrigin
with a Serializer
for a Reply
using Arg
.
There are to smart constructors for this type: replyTarget
and embeddedReplyTarget
.
Because of Arg
the Eq
and Ord
instances are implemented via
the RequestOrigin
instances.
Since: 0.26.0
MkReplyTarget (Arg (RequestOrigin p r) (Serializer (Reply p r))) |
Instances
Eq (ReplyTarget p r) Source # | |
Defined in Control.Eff.Concurrent.Protocol.Wrapper (==) :: ReplyTarget p r -> ReplyTarget p r -> Bool # (/=) :: ReplyTarget p r -> ReplyTarget p r -> Bool # | |
Ord (ReplyTarget p r) Source # | |
Defined in Control.Eff.Concurrent.Protocol.Wrapper compare :: ReplyTarget p r -> ReplyTarget p r -> Ordering # (<) :: ReplyTarget p r -> ReplyTarget p r -> Bool # (<=) :: ReplyTarget p r -> ReplyTarget p r -> Bool # (>) :: ReplyTarget p r -> ReplyTarget p r -> Bool # (>=) :: ReplyTarget p r -> ReplyTarget p r -> Bool # max :: ReplyTarget p r -> ReplyTarget p r -> ReplyTarget p r # min :: ReplyTarget p r -> ReplyTarget p r -> ReplyTarget p r # | |
Show (ReplyTarget p r) Source # | |
Defined in Control.Eff.Concurrent.Protocol.Wrapper showsPrec :: Int -> ReplyTarget p r -> ShowS # show :: ReplyTarget p r -> String # showList :: [ReplyTarget p r] -> ShowS # | |
NFData (ReplyTarget p r) Source # | |
Defined in Control.Eff.Concurrent.Protocol.Wrapper rnf :: ReplyTarget p r -> () # |
data RequestOrigin (proto :: Type) reply Source #
Instances
data Reply protocol reply where Source #
The wrapper around replies to Call
s.
Since: 0.15.0
Reply | |
|
data Request protocol where Source #
A wrapper sum type for calls and casts for the Pdu
s of a protocol
Since: 0.15.0
Call :: forall protocol reply. (Tangible reply, TangiblePdu protocol (Synchronous reply)) => RequestOrigin protocol reply -> Pdu protocol (Synchronous reply) -> Request protocol | |
Cast :: forall protocol. (TangiblePdu protocol Asynchronous, NFData (Pdu protocol Asynchronous)) => Pdu protocol Asynchronous -> Request protocol |
makeRequestOrigin :: (Typeable r, NFData r, HasProcesses e q0) => Eff e (RequestOrigin p r) Source #
Create a new, unique RequestOrigin
value for the current process.
Since: 0.24.0
toEmbeddedOrigin :: forall outer inner reply. EmbedProtocol outer inner (Synchronous reply) => RequestOrigin outer reply -> RequestOrigin inner reply Source #
Turn an RequestOrigin
to an origin for an embedded request (See EmbedProtocol
).
This is useful of a server delegates the calls
and casts
for an embedded protocol
to functions, that require the Serializer
and RequestOrigin
in order to call
sendReply
.
See also embedReplySerializer
.
Since: 0.24.3
embedRequestOrigin :: forall outer inner reply. EmbedProtocol outer inner (Synchronous reply) => RequestOrigin inner reply -> RequestOrigin outer reply Source #
Turn an embedded RequestOrigin
to a RequestOrigin
for the bigger request.
This is the inverse of toEmbeddedOrigin
.
This function is strict in all parameters.
Since: 0.24.2
embedReplySerializer :: forall outer inner reply. EmbedProtocol outer inner (Synchronous reply) => Serializer (Reply outer reply) -> Serializer (Reply inner reply) Source #
Turn a Serializer
for a Pdu
instance that contains embedded Pdu
values
into a Reply
Serializer
for the embedded Pdu
.
This is useful of a server delegates the calls
and casts
for an embedded protocol
to functions, that require the Serializer
and RequestOrigin
in order to call
sendReply
.
See also toEmbeddedOrigin
.
Since: 0.24.2
sendReply :: (HasProcesses eff q, Tangible reply, Typeable protocol) => ReplyTarget protocol reply -> reply -> Eff eff () Source #
Answer a Call
by sending the reply value to the client process.
The ProcessId
, the RequestOrigin
and the Reply
Serializer
are
stored in the ReplyTarget
.
Since: 0.25.1
replyTarget :: Serializer (Reply p reply) -> RequestOrigin p reply -> ReplyTarget p reply Source #
Smart constructor for a ReplyTarget
.
To build a ReplyTarget
for an EmbedProtocol
instance use embeddedReplyTarget
.
Since: 0.26.0
replyTargetOrigin :: Lens' (ReplyTarget p reply) (RequestOrigin p reply) Source #
A simple Lens
for the RequestOrigin
of a ReplyTarget
.
Since: 0.26.0
replyTargetSerializer :: Lens' (ReplyTarget p reply) (Serializer (Reply p reply)) Source #
A simple Lens
for the Reply
Serializer
of a ReplyTarget
.
Since: 0.26.0
embeddedReplyTarget :: EmbedProtocol outer inner (Synchronous reply) => Serializer (Reply outer reply) -> RequestOrigin outer reply -> ReplyTarget inner reply Source #
Smart constructor for an embedded ReplyTarget
.
This combines replyTarget
and toEmbeddedReplyTarget
.
Since: 0.26.0
toEmbeddedReplyTarget :: EmbedProtocol outer inner (Synchronous reply) => ReplyTarget outer reply -> ReplyTarget inner reply Source #
Convert a ReplyTarget
to be usable for embedded replies.
This combines a toEmbeddedOrigin
with embedReplySerializer
to produce a
ReplyTarget
that can be passed to functions defined soley on an embedded protocol.
Since: 0.26.0
Observer Functions for Events and Event Listener
data family Pdu protocol reply Source #
The protocol data unit type for the given protocol.
Instances
type ObserverRegistryState event = State (ObserverRegistry event) Source #
Alias for the effect that contains the observers managed by evalObserverRegistryState
data ObserverRegistry (event :: Type) Source #
A protocol for managing Observer
s, encompassing registration and de-registration of
Observer
s.
Since: 0.28.0
Instances
type CanObserve eventSink event = (Tangible event, EmbedProtocol eventSink (Observer event) Asynchronous) Source #
Convenience type alias.
Since: 0.28.0
type IsObservable eventSource event = (Tangible event, EmbedProtocol eventSource (ObserverRegistry event) Asynchronous) Source #
Convenience type alias.
Since: 0.28.0
data ObservationSink event Source #
The Information necessary to wrap an Observed
event to a process specific
message, e.g. the embedded Observer
Pdu
instance, and the MonitorReference
of
the destination process.
Since: 0.28.0
Instances
newtype Observer event Source #
A protocol to communicate Observed
events from a sources to many sinks.
A sink is any process that serves a protocol with a Pdu
instance that embeds
the Observer
Pdu via an EmbedProtocol
instance.
This type has dual use, for one it serves as type-index for Pdu
, i.e.
HasPdu
respectively, and secondly it contains an ObservationSink
and
a MonitorReference
.
The ObservationSink
is used to serialize and send the Observed
events,
while the ProcessId
serves as key for internal maps.
Since: 0.28.0
MkObserver (Arg ProcessId (ObservationSink event)) |
Instances
registerObserver :: forall event eventSink eventSource r q. (HasCallStack, HasProcesses r q, IsObservable eventSource event, CanObserve eventSink event) => Endpoint eventSource -> Endpoint eventSink -> Eff r () Source #
And an Observer
to the set of recipients for all observations reported by observerRegistryNotify
.
Note that the observerRegistry are keyed by the observing process, i.e. a previous entry for the process
contained in the Observer
is overwritten. If you want multiple entries for a single process, just
combine several filter functions.
Since: 0.16.0
forgetObserver :: forall event eventSink eventSource r q. (HasProcesses r q, HasCallStack, IsObservable eventSource event, CanObserve eventSink event) => Endpoint eventSource -> Endpoint eventSink -> Eff r () Source #
Send the ForgetObserver
message
Since: 0.16.0
forgetObserverUnsafe :: forall event eventSource r q. (HasProcesses r q, HasCallStack, IsObservable eventSource event) => Endpoint eventSource -> ProcessId -> Eff r () Source #
Send the ForgetObserver
message, use a raw ProcessId
as parameter.
Since: 0.28.0
observerRegistryHandlePdu :: forall event q r. (HasCallStack, Typeable event, HasProcesses r q, Member (ObserverRegistryState event) r, Member Logs r) => Pdu (ObserverRegistry event) Asynchronous -> Eff r () Source #
Provide the implementation for the ObserverRegistry
Protocol, this handled RegisterObserver
and ForgetObserver
messages. It also adds the ObserverRegistryState
constraint to the effect list.
Since: 0.28.0
observerRegistryRemoveProcess :: forall event q r. (HasCallStack, Typeable event, HasProcesses r q, Member (ObserverRegistryState event) r, Member Logs r) => ProcessId -> Eff r Bool Source #
Remove the entry in the ObserverRegistry
for the ProcessId
and return True
if there was an entry, False
otherwise.
Since: 0.28.0
evalObserverRegistryState :: HasCallStack => Eff (ObserverRegistryState event ': r) a -> Eff r a Source #
Keep track of registered Observer
s.
Handle the ObserverRegistryState
effect, i.e. run evalState
on an emptyObserverRegistry
.
Since: 0.28.0
emptyObserverRegistry :: ObserverRegistry event Source #
The empty ObserverRegistryState
Since: 0.28.0
observerRegistryNotify :: forall event r q. (HasProcesses r q, Member (ObserverRegistryState event) r, Tangible event, HasCallStack) => event -> Eff r () Source #
Report an observation to all observers.
The process needs to evalObserverRegistryState
and to observerRegistryHandlePdu
.
Since: 0.28.0
Utilities
Logging Effect
module Control.Eff.Log
Log Writer
Asynchronous
module Control.Eff.LogWriter.Async
Console
File
module Control.Eff.LogWriter.File
UDP
module Control.Eff.LogWriter.UDP
Non-IO Log Message Capturing
Debug.Trace
Generic IO
module Control.Eff.LogWriter.IO
Unix Domain Socket
Preventing Space Leaks
module Control.Eff.Loop