org.axonframework.eventhandling.saga

Interface SagaRepository<T>

All Known Implementing Classes:

AnnotatedSagaRepository, LockingSagaRepository

public interface SagaRepository<T>

Interface towards the storage mechanism of Saga instances. Saga Repositories can find sagas either through the values they have been associated with (see AssociationValue) or via their unique identifier.

Since:

3.0

Author:

Allard Buijze

Method Summary

Modifier and Type	Method and Description
Saga<T>	createInstance(String sagaIdentifier, Supplier<T> factoryMethod) Creates a new Saga instance.
Set<String>	find(AssociationValue associationValue) Find saga instances of the given type that have been associated with the given associationValue.
Saga<T>	load(String sagaIdentifier) Loads a known Saga instance by its unique identifier.

Method Detail

find

Set<String> find(AssociationValue associationValue)

Find saga instances of the given type that have been associated with the given associationValue.

Parameters:

associationValue - The value that the returned Sagas must be associated with

Returns:

A Set containing the found Saga instances. If none are found, an empty Set is returned. Will never return null.

load

Saga<T> load(String sagaIdentifier)

Loads a known Saga instance by its unique identifier. Due to the concurrent nature of Sagas, it is not unlikely for a Saga to have ceased to exist after it has been found based on associations. Therefore, a repository should return null in case a Saga doesn't exists, as opposed to throwing an exception.

Parameters:

sagaIdentifier - The unique identifier of the Saga to load

Returns:

The Saga instance, or null if no such saga exists

createInstance

Saga<T> createInstance(String sagaIdentifier,
                       Supplier<T> factoryMethod)

Creates a new Saga instance. The returned Saga will delegate event handling to the instance supplied by the given factoryMethod.

Parameters:

sagaIdentifier - the identifier to use for the new saga instance

factoryMethod - Used to create a new Saga delegate

Returns:

a new Saga instance wrapping an instance of type T