org.axonframework.saga

Class AbstractSagaManager

java.lang.Object

org.axonframework.saga.AbstractSagaManager

All Implemented Interfaces:

Subscribable, EventListener, EventListenerProxy, SagaManager

Direct Known Subclasses:

AnnotatedSagaManager, SimpleSagaManager

public abstract class AbstractSagaManager
extends Object
implements SagaManager, Subscribable

Abstract implementation of the SagaManager interface that provides basic functionality required by most SagaManager implementations. Provides support for Saga lifecycle management and asynchronous handling of events.

Since:

0.7

Author:

Allard Buijze

Constructor Summary

Constructors

Constructor and Description
AbstractSagaManager(EventBus eventBus, SagaRepository sagaRepository, SagaFactory sagaFactory, Class<? extends Saga>... sagaTypes) Deprecated. use AbstractSagaManager(SagaRepository, SagaFactory, Class[]) and register using EventBus.subscribe(org.axonframework.eventhandling.EventListener)
AbstractSagaManager(SagaRepository sagaRepository, SagaFactory sagaFactory, Class<? extends Saga>... sagaTypes) Initializes the SagaManager with the given sagaRepository.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	commit(Saga saga) Commits the given saga to the registered repository.
protected abstract Set<AssociationValue>	extractAssociationValues(Class<? extends Saga> sagaType, EventMessage event) Extracts the AssociationValues from the given event as relevant for a Saga of given sagaType.
Set<Class<? extends Saga>>	getManagedSagaTypes() Returns the set of Saga types managed by this instance.
protected abstract SagaInitializationPolicy	getSagaCreationPolicy(Class<? extends Saga> sagaType, EventMessage event) Returns the Saga Initialization Policy for a Saga of the given sagaType and event.
void	handle(EventMessage event) Handles the event by passing it to all Saga instances that have an Association Value found in the given event.
protected void	preProcessSaga(Saga saga) Perform pre-processing of sagas that have been newly created or have been loaded from the repository.
void	setSuppressExceptions(boolean suppressExceptions) Sets whether or not to suppress any exceptions that are cause by invoking Sagas.
void	setSynchronizeSagaAccess(boolean synchronizeSagaAccess) Sets whether of not access to Saga's Event Handler should by synchronized.
void	subscribe() Deprecated. Use EventBus.subscribe(org.axonframework.eventhandling.EventListener) to subscribe this instance
void	unsubscribe() Deprecated. Use EventBus.unsubscribe(org.axonframework.eventhandling.EventListener) to unsubscribe this instance

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.axonframework.eventhandling.EventListenerProxy

getTargetType

Constructor Detail

AbstractSagaManager

@Deprecated
public AbstractSagaManager(EventBus eventBus,
                              SagaRepository sagaRepository,
                              SagaFactory sagaFactory,
                              Class<? extends Saga>... sagaTypes)

Deprecated. use AbstractSagaManager(SagaRepository, SagaFactory, Class[]) and register using EventBus.subscribe(org.axonframework.eventhandling.EventListener)

Initializes the SagaManager with the given eventBus and sagaRepository.

Parameters:

eventBus - The event bus providing the events to route to sagas.

sagaRepository - The repository providing the saga instances.

sagaFactory - The factory providing new saga instances

sagaTypes - The types of Saga supported by this Saga Manager

AbstractSagaManager

public AbstractSagaManager(SagaRepository sagaRepository,
                   SagaFactory sagaFactory,
                   Class<? extends Saga>... sagaTypes)

Initializes the SagaManager with the given sagaRepository.

Parameters:

sagaRepository - The repository providing the saga instances.

sagaFactory - The factory providing new saga instances

sagaTypes - The types of Saga supported by this Saga Manager

Method Detail

handle

public void handle(EventMessage event)

Description copied from interface: SagaManager

Handles the event by passing it to all Saga instances that have an Association Value found in the given event.

Specified by:

handle in interface EventListener

Specified by:

handle in interface SagaManager

Parameters:

event - the event to handle

getSagaCreationPolicy

protected abstract SagaInitializationPolicy getSagaCreationPolicy(Class<? extends Saga> sagaType,
                                             EventMessage event)

Returns the Saga Initialization Policy for a Saga of the given sagaType and event. This policy provides the conditions to create new Saga instance, as well as the initial association of that saga.

Parameters:

sagaType - The type of Saga to get the creation policy for

event - The Event that is being dispatched to Saga instances

Returns:

the initialization policy for the Saga

extractAssociationValues

protected abstract Set<AssociationValue> extractAssociationValues(Class<? extends Saga> sagaType,
                                             EventMessage event)

Extracts the AssociationValues from the given event as relevant for a Saga of given sagaType. A single event may be associated with multiple values.

Parameters:

sagaType - The type of Saga about to handle the Event

event - The event containing the association information

Returns:

the AssociationValues indicating which Sagas should handle given event

preProcessSaga

protected void preProcessSaga(Saga saga)

Perform pre-processing of sagas that have been newly created or have been loaded from the repository. This method is invoked prior to invocation of the saga instance itself.

Parameters:

saga - The saga instance for pre-processing

commit

protected void commit(Saga saga)

Commits the given saga to the registered repository.

Parameters:

saga - the Saga to commit.

unsubscribe

@PreDestroy
@Deprecated
public void unsubscribe()

Deprecated. Use EventBus.unsubscribe(org.axonframework.eventhandling.EventListener) to unsubscribe this instance

Unsubscribe the EventListener with the configured EventBus.

Specified by:

unsubscribe in interface Subscribable

subscribe

@PostConstruct
@Deprecated
public void subscribe()

Deprecated. Use EventBus.subscribe(org.axonframework.eventhandling.EventListener) to subscribe this instance

Subscribe the EventListener with the configured EventBus.

Specified by:

subscribe in interface Subscribable

setSuppressExceptions

public void setSuppressExceptions(boolean suppressExceptions)

Sets whether or not to suppress any exceptions that are cause by invoking Sagas. When suppressed, exceptions are logged. Defaults to true.

Parameters:

suppressExceptions - whether or not to suppress exceptions from Sagas.

setSynchronizeSagaAccess

public void setSynchronizeSagaAccess(boolean synchronizeSagaAccess)

Sets whether of not access to Saga's Event Handler should by synchronized. Defaults to true. Sets to false only if the Saga managed by this manager are completely thread safe by themselves.

Parameters:

synchronizeSagaAccess - whether or not to synchronize access to Saga's event handlers.

getManagedSagaTypes

public Set<Class<? extends Saga>> getManagedSagaTypes()

Returns the set of Saga types managed by this instance.

Returns:

the set of Saga types managed by this instance.