Package io.camunda.zeebe.engine.state.appliers

Class EventAppliers

java.lang.Object

io.camunda.zeebe.engine.state.appliers.EventAppliers

All Implemented Interfaces:

EventApplier

public final class EventAppliers
extends Object
implements EventApplier

Applies state changes from events to the MutableProcessingState.

Finds the correct TypedEventApplier and delegates.

Nested Class Summary

Nested classes/interfaces inherited from interface io.camunda.zeebe.engine.state.EventApplier

EventApplier.NoSuchEventApplier

Field Summary

Fields

Modifier and Type	Field	Description
static final TypedEventApplier<Intent,RecordValue>	NOOP_EVENT_APPLIER

Constructor Summary

Constructors

Constructor	Description
EventAppliers()

Method Summary

Modifier and Type	Method	Description
void	applyState(long key, Intent intent, RecordValue value, int recordVersion)	Apply the state changes of the given event.
int	getLatestVersion(Intent intent)	Returns the latest EventApplier version of a given Intent.
EventAppliers	registerEventAppliers(MutableProcessingState state)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

NOOP_EVENT_APPLIER

public static final TypedEventApplier<Intent,RecordValue> NOOP_EVENT_APPLIER

Constructor Details

EventAppliers

public EventAppliers()

Method Details

registerEventAppliers

public EventAppliers registerEventAppliers(MutableProcessingState state)

getLatestVersion

public int getLatestVersion(Intent intent)

Description copied from interface: EventApplier

Returns the latest EventApplier version of a given Intent.

Specified by:

getLatestVersion in interface EventApplier

Parameters:

intent - the Intent of the EventApplier

Returns:

the latest version of the given intent, -1 if no EventApplier is found

applyState

public void applyState(long key,
 Intent intent,
 RecordValue value,
 int recordVersion)
                throws EventApplier.NoSuchEventApplier

Description copied from interface: EventApplier

Apply the state changes of the given event. It will use the event applier that matches the specified version.

Specified by:

applyState in interface EventApplier

Parameters:

key - the key of the event

intent - the intent of the event

value - the value of the event

recordVersion - the record version of the event

Throws:

EventApplier.NoSuchEventApplier - if no event applier is found for the given intent and record version. The event is not applied and it is up to the caller to decide what to do.