Override this handler to define the action on Domain Event
Override this handler to define the action on Domain Event
domain event to apply
state data of the previous state
updated state data
Domain event's Class Used for identifying domain events during recovery
Domain event's Class Used for identifying domain events during recovery
Id of the persistent entity for which messages should be replayed.
Id of the persistent entity for which messages should be replayed.
This extractor is just convenience for matching a (S, S) pair, including a reminder what the new state is.
This extractor is just convenience for matching a (S, S) pair, including a reminder what the new state is.
Default reason if calling stop()
.
Default reason if calling stop()
.
Reason given when someone was calling system.stop(fsm)
from outside;
also applies to Stop
supervision directive.
Reason given when someone was calling system.stop(fsm)
from outside;
also applies to Stop
supervision directive.
This case object is received in case of a state timeout.
This case object is received in case of a state timeout.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
INTERNAL API.
Cancel named timer, ensuring that the message is not subsequently delivered (no race).
Cancel named timer, ensuring that the message is not subsequently delivered (no race).
of the timer to cancel
Defer the handler execution until all pending handlers have been executed.
Defer the handler execution until all pending handlers have been executed. It is guaranteed that no new commands
will be received by a persistent actor between a call to defer
and the execution of its handler
.
Allows to define logic within the actor, which will respect the invocation-order-guarantee
in respect to persistAsync
or persist
calls. That is, if persistAsync
or persist
was invoked before defer
,
the corresponding handlers will be invoked in the same order as they were registered in.
This call will NOT result in event
being persisted, use persist
or persistAsync
instead
if the given event should possible to replay.
If there are no pending persist handler calls, the handler will be called immediately.
If persistence of an earlier event fails, the persistent actor will stop, and the handler
will not be run.
event to be handled in the future, when preceding persist operations have been processes
handler for the given event
Defer the handler execution until all pending handlers have been executed.
Defer the handler execution until all pending handlers have been executed.
Allows to define logic within the actor, which will respect the invocation-order-guarantee
in respect to persistAsync
or persist
calls. That is, if persistAsync
or persist
was invoked before deferAsync
,
the corresponding handlers will be invoked in the same order as they were registered in.
This call will NOT result in event
being persisted, use persist
or persistAsync
instead
if the given event should possible to replay.
If there are no pending persist handler calls, the handler will be called immediately.
If persistence of an earlier event fails, the persistent actor will stop, and the handler
will not be run.
event to be handled in the future, when preceding persist operations have been processes
handler for the given event
Permanently deletes all persistent messages with sequence numbers less than or equal toSequenceNr
.
Permanently deletes all persistent messages with sequence numbers less than or equal toSequenceNr
.
If the delete is successful a DeleteMessagesSuccess will be sent to the actor. If the delete fails a DeleteMessagesFailure will be sent to the actor.
The given toSequenceNr
must be less than or equal to Eventsourced#lastSequenceNr, otherwise
DeleteMessagesFailure is sent to the actor without performing the delete. All persistent
messages may be deleted without specifying the actual sequence number by using Long.MaxValue
as the toSequenceNr
.
upper sequence number (inclusive) bound of persistent messages to be deleted.
Deletes the snapshot identified by sequenceNr
.
Deletes the snapshot identified by sequenceNr
.
The PersistentActor will be notified about the status of the deletion via an DeleteSnapshotSuccess or DeleteSnapshotFailure message.
Deletes all snapshots matching criteria
.
Deletes all snapshots matching criteria
.
The PersistentActor will be notified about the status of the deletion via an DeleteSnapshotsSuccess or DeleteSnapshotsFailure message.
Adapter from Java Class to scala.reflect.ClassTag
Adapter from Java Class to scala.reflect.ClassTag
domain event scala.reflect.ClassTag
Domain event's scala.reflect.ClassTag Used for identifying domain events during recovery
Domain event's scala.reflect.ClassTag Used for identifying domain events during recovery
Adapter from Java 8 Functional Interface to Scala Function
Adapter from Java 8 Functional Interface to Scala Function
- Java 8 lambda expression defining the action
action represented as a Scala Functin
Returns this AbstractActor's ActorContext The ActorContext is not thread safe so do not expose it outside of the AbstractActor.
Returns this AbstractActor's ActorContext The ActorContext is not thread safe so do not expose it outside of the AbstractActor.
Retrieve current rolling log in oldest-first order.
Retrieve current rolling log in oldest-first order. The log is filled with each incoming event before processing by the user supplied state handler. The log entries are lost when this actor is restarted.
Returns the ActorRef for this actor.
Returns the ActorRef for this actor.
Same as self()
.
The reference sender Actor of the currently processed message.
The reference sender Actor of the currently processed message. This is always a legal destination to send to, even if there is no logical recipient for the reply, in which case it will be sent to the dead letter mailbox.
Same as sender()
.
WARNING: Only valid within the Actor itself, so do not close over it and publish it to other threads!
Produce transition to other state.
Produce transition to other state. Return this from a state function in order to effect the transition.
state designator for the next state
state transition descriptor
Produce transition to other state.
Produce transition to other state. Return this from a state function in order to effect the transition.
This method always triggers transition events, even for A -> A
transitions.
If you want to stay in the same state without triggering an state transition event use #stay instead.
state designator for the next state
state transition descriptor
The returned StashOverflowStrategy object determines how to handle the message failed to stash when the internal Stash capacity exceeded.
The returned StashOverflowStrategy object determines how to handle the message failed to stash when the internal Stash capacity exceeded.
Inquire whether the named timer is still active.
Inquire whether the named timer is still active. Returns true unless the timer does not exist, has previously been canceled or if it was a single-shot timer whose message was already received.
Configuration id of the journal plugin servicing this persistent actor.
Configuration id of the journal plugin servicing this persistent actor.
When empty, looks in akka.persistence.journal.plugin
to find configuration entry path.
When configured, uses journalPluginId
as absolute path to the journal configuration entry.
Configuration entry must contain few required fields, such as class
. See src/main/resources/reference.conf
.
Highest received sequence number so far or 0L
if this actor hasn't replayed
or stored any persistent events yet.
Highest received sequence number so far or 0L
if this actor hasn't replayed
or stored any persistent events yet.
Instructs the snapshot store to load the specified snapshot and send it via an SnapshotOffer to the running PersistentActor.
Instructs the snapshot store to load the specified snapshot and send it via an SnapshotOffer to the running PersistentActor.
By default PersistentFSM.Failure is logged at error level and other reason types are not logged.
By default PersistentFSM.Failure is logged at error level and other reason types are not logged. It is possible to override this behavior.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches on any type of event.
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create a akka.japi.pf.UnitPFBuilder with the first case statement set.
Create a akka.japi.pf.UnitPFBuilder with the first case statement set.
a type to match the argument against
a predicate that will be evaluated on the argument if the type matches
an action to apply to the argument if the type and predicate matches
a builder with the case statement added
Create a akka.japi.pf.UnitPFBuilder with the first case statement set.
Create a akka.japi.pf.UnitPFBuilder with the first case statement set.
a type to match the argument against
an action to apply to the argument if the type matches
a builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches if any of the event types in the list match or any of the event instances in the list compares equal.
a list of types or instances to match against
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches on the data type and if any of the event types in the list match or any of the event instances in the list compares equal.
a list of types or instances to match against
the data type to match on
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches if the predicate matches.
a predicate that will be evaluated on the data and the event
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches if the event type matches.
the event type to match on
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches if the event type and predicate matches.
the event type to match on
a predicate that will be evaluated on the data and the event
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches on an event and data type.
the event type to match on
the data type to match on
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches on an event and data type and a predicate.
the event type to match on
the data type to match on
a predicate to evaluate on the matched types
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches if the event compares equal.
an event to compare equal against
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
Create an akka.japi.pf.FSMStateFunctionBuilder with the first case statement set.
A case statement that matches on the data type and if the event compares equal.
an event to compare equal against
the data type to match on
an action to apply to the event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMTransitionHandlerBuilder with the first case statement set.
Create an akka.japi.pf.FSMTransitionHandlerBuilder with the first case statement set.
A case statement that matches on a from state and a to state.
the from state to match on
the to state to match on
an action to apply when the states match
the builder with the case statement added
Create an akka.japi.pf.FSMTransitionHandlerBuilder with the first case statement set.
Create an akka.japi.pf.FSMTransitionHandlerBuilder with the first case statement set.
A case statement that matches on a from state and a to state.
the from state to match on
the to state to match on
an action to apply when the states match
the builder with the case statement added
Create an akka.japi.pf.FSMStopBuilder with the first case statement set.
Create an akka.japi.pf.FSMStopBuilder with the first case statement set.
A case statement that matches on a reason type and a predicate.
the reason type to match on
a predicate that will be evaluated on the reason if the type matches
an action to apply to the reason, event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStopBuilder with the first case statement set.
Create an akka.japi.pf.FSMStopBuilder with the first case statement set.
A case statement that matches on a reason type.
the reason type to match on
an action to apply to the reason, event and state data if there is a match
the builder with the case statement added
Create an akka.japi.pf.FSMStopBuilder with the first case statement set.
Create an akka.japi.pf.FSMStopBuilder with the first case statement set.
A case statement that matches on an PersistentFSM.Reason.
the reason for the termination
an action to apply to the event and state data if there is a match
the builder with the case statement added
Return next state data (available in onTransition handlers)
Return next state data (available in onTransition handlers)
Called when persist fails.
Called when persist fails. By default it logs the error. Subclass may override to customize logging and for example send negative acknowledgment to sender.
The actor is always stopped after this method has been invoked.
Note that the event may or may not have been saved, depending on the type of failure.
failure cause.
the event that was to be persisted
Called when the journal rejected persist
of an event.
Called when the journal rejected persist
of an event. The event was not
stored. By default this method logs the problem as an error, and the actor continues.
The callback handler that was passed to the persist
method will not be invoked.
failure cause
the event that was to be persisted
Override this handler to define the action on recovery completion
Override this handler to define the action on recovery completion
Called whenever a message replay fails.
Called whenever a message replay fails. By default it logs the error.
Subclass may override to customize logging.
The actor is always stopped after this method has been invoked.
failure cause.
the event that was processed in receiveRecover
, if the exception
was thrown there
Set handler which is called upon termination of this FSM actor.
Set handler which is called upon termination of this FSM actor. Calling this method again will overwrite the previous contents.
Set handler which is called upon termination of this FSM actor.
Set handler which is called upon termination of this FSM actor. Calling this method again will overwrite the previous contents.
Add a handler which is called upon each state transition, i.e.
Add a handler which is called upon each state transition, i.e. not when staying in the same state.
Multiple handlers may be installed, and every one of them will be called, not only the first one matching.
Add a handler which is called upon each state transition, i.e.
Add a handler which is called upon each state transition, i.e. not when staying in the same state.
Multiple handlers may be installed, and every one of them will be called, not only the first one matching.
Set handler which is called upon each state transition, i.e.
Set handler which is called upon each state transition, i.e. not when staying in the same state. This may use the pair extractor defined in the FSM companion object like so:
onTransition { case Old -> New => doSomething }
It is also possible to supply a 2-ary function object:
onTransition(handler _) private def handler(from: S, to: S) { ... }
The underscore is unfortunately necessary to enable the nicer syntax shown above (it uses the implicit conversion total2pf under the hood).
Multiple handlers may be installed, and every one of them will be called, not only the first one matching.
Asynchronously persists event
.
Asynchronously persists event
. On successful persistence, handler
is called with the
persisted event. It is guaranteed that no new commands will be received by a persistent actor
between a call to persist
and the execution of its handler
. This also holds for
multiple persist
calls per received command. Internally, this is achieved by stashing new
commands and unstashing them when the event
has been persisted and handled. The stash used
for that is an internal stash which doesn't interfere with the inherited user stash.
An event handler
may close over persistent actor state and modify it. The sender
of a persisted
event is the sender of the corresponding command. This means that one can reply to a command
sender within an event handler
.
Within an event handler, applications usually update persistent actor state using persisted event data, notify listeners and reply to command senders.
If persistence of an event fails, #onPersistFailure will be invoked and the actor will unconditionally be stopped. The reason that it cannot resume when persist fails is that it is unknown if the event was actually persisted or not, and therefore it is in an inconsistent state. Restarting on persistent failures will most likely fail anyway, since the journal is probably unavailable. It is better to stop the actor and after a back-off timeout start it again.
event to be persisted
handler for each persisted event
Asynchronously persists events
in specified order.
Asynchronously persists events
in specified order. This is equivalent to calling
persist[A](event: A)(handler: A => Unit)
multiple times with the same handler
,
except that events
are persisted atomically with this method.
events to be persisted
handler for each persisted events
Asynchronously persists events
in specified order.
Asynchronously persists events
in specified order. This is equivalent to calling
persistAsync[A](event: A)(handler: A => Unit)
multiple times with the same handler
,
except that events
are persisted atomically with this method.
events to be persisted
handler for each persisted events
Asynchronously persists event
.
Asynchronously persists event
. On successful persistence, handler
is called with the
persisted event.
Unlike persist
the persistent actor will continue to receive incoming commands between the
call to persist
and executing it's handler
. This asynchronous, non-stashing, version of
of persist should be used when you favor throughput over the "command-2 only processed after
command-1 effects' have been applied" guarantee, which is provided by the plain persist
method.
An event handler
may close over persistent actor state and modify it. The sender
of a persisted
event is the sender of the corresponding command. This means that one can reply to a command
sender within an event handler
.
If persistence of an event fails, #onPersistFailure will be invoked and the actor will unconditionally be stopped. The reason that it cannot resume when persist fails is that it is unknown if the event was actually persisted or not, and therefore it is in an inconsistent state. Restarting on persistent failures will most likely fail anyway, since the journal is probably unavailable. It is better to stop the actor and after a back-off timeout start it again.
event to be persisted
handler for each persisted event
After recovery events are handled as in usual FSM actor
After recovery events are handled as in usual FSM actor
Discover the latest recorded state
Discover the latest recorded state
Called when the persistent actor is started for the first time.
Called when the persistent actor is started for the first time. The returned Recovery object defines how the Actor will recover its persistent state before handling the first incoming message.
To skip recovery completely return Recovery.none
.
Returns true
if this persistent actor has successfully finished recovery.
Returns true
if this persistent actor has successfully finished recovery.
Returns true
if this persistent actor is currently recovering.
Returns true
if this persistent actor is currently recovering.
Saves a snapshot
of this snapshotter's state.
Saves a snapshot
of this snapshotter's state.
The PersistentActor will be notified about the success or failure of this via an SaveSnapshotSuccess or SaveSnapshotFailure message.
Save the current state as a snapshot
Save the current state as a snapshot
Set state timeout explicitly.
Set state timeout explicitly. This method can safely be used from within a state handler.
Schedule named timer to deliver message after given delay, possibly repeating.
Schedule named timer to deliver message after given delay, possibly repeating. Any existing timer with the same name will automatically be canceled before adding the new timer.
identifier to be used with cancelTimer()
message to be delivered
delay of first message delivery and between subsequent messages
Schedule named timer to deliver message after given delay, possibly repeating.
Schedule named timer to deliver message after given delay, possibly repeating. Any existing timer with the same name will automatically be canceled before adding the new timer.
identifier to be used with cancelTimer()
message to be delivered
delay of first message delivery and between subsequent messages
send once if false, scheduleAtFixedRate if true
Configuration id of the snapshot plugin servicing this persistent actor.
Configuration id of the snapshot plugin servicing this persistent actor.
When empty, looks in akka.persistence.snapshot-store.plugin
to find configuration entry path.
When configured, uses snapshotPluginId
as absolute path to the snapshot store configuration entry.
Configuration entry must contain few required fields, such as class
. See src/main/resources/reference.conf
.
Returns lastSequenceNr
.
Returns lastSequenceNr
.
Returns persistenceId
.
Returns persistenceId
.
Set initial state.
Set initial state. Call this method from the constructor before the #initialize method. If different state is needed after a restart this method, followed by #initialize, can be used in the actor life cycle hooks akka.actor.Actor#preStart and akka.actor.Actor#postRestart.
initial state designator
initial state data
state timeout for the initial state, overriding the default timeout for that state
Set initial state.
Set initial state. Call this method from the constructor before the #initialize method. If different state is needed after a restart this method, followed by #initialize, can be used in the actor life cycle hooks akka.actor.Actor#preStart and akka.actor.Actor#postRestart.
initial state designator
initial state data
Set initial state.
Set initial state. Call this method from the constructor before the #initialize method. If different state is needed after a restart this method, followed by #initialize, can be used in the actor life cycle hooks akka.actor.Actor#preStart and akka.actor.Actor#postRestart.
initial state designator
initial state data
state timeout for the initial state, overriding the default timeout for that state
Return current state data (i.e.
Return current state data (i.e. object of type D)
Return current state name (i.e.
Return current state name (i.e. object of type S)
Map from state identifier to state instance
Map from state identifier to state instance
Produce "empty" transition descriptor.
Produce "empty" transition descriptor. Return this from a state function when no state change is to be effected.
No transition event will be triggered by #stay.
If you want to trigger an event like S -> S
for onTransition
to handle use goto
instead.
descriptor for staying in current state
Produce change descriptor to stop this FSM actor including specified reason.
Produce change descriptor to stop this FSM actor including specified reason.
Produce change descriptor to stop this FSM actor including specified reason.
Produce change descriptor to stop this FSM actor including specified reason.
Produce change descriptor to stop this FSM actor with reason "Normal".
Produce change descriptor to stop this FSM actor with reason "Normal".
Convenience wrapper for using a total function instead of a partial function literal.
Convenience wrapper for using a total function instead of a partial function literal. To be used with onTransition.
Insert a new StateFunction at the end of the processing chain for the given state.
Insert a new StateFunction at the end of the processing chain for the given state. If the stateTimeout parameter is set, entering this state without a differing explicit timeout setting will trigger a StateTimeout event; the same is true when using #stay.
designator for the state
default state timeout for this state
partial function builder describing response to input
Insert a new StateFunction at the end of the processing chain for the given state.
Insert a new StateFunction at the end of the processing chain for the given state.
designator for the state
partial function builder describing response to input
Insert a new StateFunction at the end of the processing chain for the given state.
Insert a new StateFunction at the end of the processing chain for the given state.
designator for the state
partial function describing response to input
Insert a new StateFunction at the end of the processing chain for the given state.
Insert a new StateFunction at the end of the processing chain for the given state. If the stateTimeout parameter is set, entering this state without a differing explicit timeout setting will trigger a StateTimeout event; the same is true when using #stay.
designator for the state
default state timeout for this state
partial function describing response to input
Set handler which is called upon reception of unhandled messages.
Set handler which is called upon reception of unhandled messages. Calling this method again will overwrite the previous contents.
The current state may be queried using
.
stateName
Set handler which is called upon reception of unhandled messages.
Set handler which is called upon reception of unhandled messages. Calling this method again will overwrite the previous contents.
The current state may be queried using
.
stateName
(abstractPersistentLoggingFSM: ArrowAssoc[AbstractPersistentLoggingFSM[S, D, E]]).->(y)
Java API: compatible with lambda expressions
Persistent Finite State Machine actor abstract base class with FSM Logging