org.axonframework.eventsourcing

Class EventSourcingRepository.Builder<T>

java.lang.Object

org.axonframework.modelling.command.AbstractRepository.Builder<T>

org.axonframework.modelling.command.LockingRepository.Builder<T>

org.axonframework.eventsourcing.EventSourcingRepository.Builder<T>

Type Parameters:

T - a generic specifying the Aggregate type contained in this Repository implementation

Enclosing class:

EventSourcingRepository<T>

public static class EventSourcingRepository.Builder<T>
extends LockingRepository.Builder<T>

Builder class to instantiate a EventSourcingRepository. Can also be used to instantiate a CachingEventSourcingRepository. This Builder will check whether a Cache is provided. If this holds, the build() function returns a CachingEventSourcingRepository instead of an EventSourcingRepository.

The LockFactory is defaulted to an PessimisticLockFactory and the SnapshotTriggerDefinition to a NoSnapshotTriggerDefinition implementation. A goal of this Builder goal is to create an AggregateModel specifying generic T as the aggregate type to be stored. All aggregates in this repository must be instanceOf this aggregate type. To instantiate this AggregateModel, either an AggregateModel can be provided directly or an aggregateType of type Class can be used. The latter will internally resolve to an AggregateModel. Thus, either the AggregateModel or the aggregateType should be provided. The same criteria holds for the AggregateFactory. Either the AggregateFactory can be set directly or it will be instantiated internally based on the aggregateType. Hence, one of both is a hard requirement.

Additionally, the EventStore is a hard requirement and as such should be provided.

Field Summary

Fields

Modifier and Type	Field and Description
protected Cache	cache
protected EventStore	eventStore
protected Predicate<? super DomainEventMessage<?>>	eventStreamFilter
protected RepositoryProvider	repositoryProvider
protected SnapshotTriggerDefinition	snapshotTriggerDefinition

Fields inherited from class org.axonframework.modelling.command.AbstractRepository.Builder

aggregateType

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Builder(Class<T> aggregateType) Creates a builder for a Repository for given aggregateType.

Method Summary

Modifier and Type	Method and Description
EventSourcingRepository.Builder<T>	aggregateFactory(AggregateFactory<T> aggregateFactory) Sets the AggregateFactory used to create new Aggregate instances.
EventSourcingRepository.Builder<T>	aggregateModel(AggregateModel<T> aggregateModel) Sets the AggregateModel of generic type T, describing the structure of the aggregate this Repository will store.
<R extends EventSourcingRepository<T>> R	build() Initializes a EventSourcingRepository or CachingEventSourcingRepository as specified through this Builder.
EventSourcingRepository.Builder<T>	cache(Cache cache) Sets the Cache which services repositories for specific aggregate types.
EventSourcingRepository.Builder<T>	eventStore(EventStore eventStore) Sets the EventStore that holds the event stream this repository needs to event source an Aggregate.
EventSourcingRepository.Builder<T>	eventStreamFilter(Predicate<? super DomainEventMessage<?>> filter) Sets the Predicate used to filter events when reading from the EventStore.
EventSourcingRepository.Builder<T>	filterByAggregateType() Configures a filter that rejects events with a different Aggregate type than the one specified by this Repository's AggregateModel.
EventSourcingRepository.Builder<T>	handlerDefinition(HandlerDefinition handlerDefinition) Sets the HandlerDefinition used to create concrete handlers for the given aggregateType.
EventSourcingRepository.Builder<T>	lockFactory(LockFactory lockFactory) Sets the LockFactory used to lock an aggregate.
EventSourcingRepository.Builder<T>	parameterResolverFactory(ParameterResolverFactory parameterResolverFactory) Sets the ParameterResolverFactory used to resolve parameters for annotated handlers contained in the Aggregate.
EventSourcingRepository.Builder<T>	repositoryProvider(RepositoryProvider repositoryProvider) Sets the RepositoryProvider which services repositories for specific aggregate types.
EventSourcingRepository.Builder<T>	snapshotTriggerDefinition(SnapshotTriggerDefinition snapshotTriggerDefinition) Sets the SnapshotTriggerDefinition specifying when to trigger a snapshot for an Aggregate contained in this repository.
protected void	validate() Validates whether the fields contained in this Builder are set accordingly.

Methods inherited from class org.axonframework.modelling.command.AbstractRepository.Builder

buildAggregateModel

Methods inherited from class java.lang.Object

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

Field Detail

eventStore

protected EventStore eventStore

snapshotTriggerDefinition

protected SnapshotTriggerDefinition snapshotTriggerDefinition

repositoryProvider

protected RepositoryProvider repositoryProvider

cache

protected Cache cache

eventStreamFilter

protected Predicate<? super DomainEventMessage<?>> eventStreamFilter

Constructor Detail

Builder

protected Builder(Class<T> aggregateType)

Creates a builder for a Repository for given aggregateType.

Parameters:

aggregateType - the aggregateType specifying the type of aggregate this Repository will store

Method Detail

parameterResolverFactory

public EventSourcingRepository.Builder<T> parameterResolverFactory(ParameterResolverFactory parameterResolverFactory)

Description copied from class: AbstractRepository.Builder

Sets the ParameterResolverFactory used to resolve parameters for annotated handlers contained in the Aggregate. Only used if the aggregateType approach is selected to create an AggregateModel.

Overrides:

parameterResolverFactory in class LockingRepository.Builder<T>

Parameters:

parameterResolverFactory - a ParameterResolverFactory used to resolve parameters for annotated handlers contained in the Aggregate

Returns:

the current Builder instance, for fluent interfacing

handlerDefinition

public EventSourcingRepository.Builder<T> handlerDefinition(HandlerDefinition handlerDefinition)

Description copied from class: AbstractRepository.Builder

Sets the HandlerDefinition used to create concrete handlers for the given aggregateType. Only used if the aggregateType approach is selected to create an AggregateModel.

Overrides:

handlerDefinition in class LockingRepository.Builder<T>

Parameters:

handlerDefinition - a HandlerDefinition used to create concrete handlers for the given aggregateType.

Returns:

the current Builder instance, for fluent interfacing

aggregateModel

public EventSourcingRepository.Builder<T> aggregateModel(AggregateModel<T> aggregateModel)

Description copied from class: AbstractRepository.Builder

Sets the AggregateModel of generic type T, describing the structure of the aggregate this Repository will store.

Overrides:

aggregateModel in class LockingRepository.Builder<T>

Parameters:

aggregateModel - the AggregateModel of generic type T of the aggregate this Repository will store

Returns:

the current Builder instance, for fluent interfacing

lockFactory

public EventSourcingRepository.Builder<T> lockFactory(LockFactory lockFactory)

Sets the LockFactory used to lock an aggregate. Defaults to a pessimistic locking strategy, implemented in the PessimisticLockFactory. If this Builder is used to instantiate a CachingEventSourcingRepository, do note that an optimistic locking strategy is not compatible with a caching approach.

Overrides:

lockFactory in class LockingRepository.Builder<T>

Parameters:

lockFactory - a LockFactory used to lock an aggregate

Returns:

the current Builder instance, for fluent interfacing

eventStore

public EventSourcingRepository.Builder<T> eventStore(EventStore eventStore)

Sets the EventStore that holds the event stream this repository needs to event source an Aggregate.

Parameters:

eventStore - an EventStore that holds the event stream this repository needs to event source an Aggregate

Returns:

the current Builder instance, for fluent interfacing

snapshotTriggerDefinition

public EventSourcingRepository.Builder<T> snapshotTriggerDefinition(SnapshotTriggerDefinition snapshotTriggerDefinition)

Sets the SnapshotTriggerDefinition specifying when to trigger a snapshot for an Aggregate contained in this repository.

Parameters:

snapshotTriggerDefinition - a SnapshotTriggerDefinition specifying when to trigger a snapshot for an Aggregate contained in this repository

Returns:

the current Builder instance, for fluent interfacing

aggregateFactory

public EventSourcingRepository.Builder<T> aggregateFactory(AggregateFactory<T> aggregateFactory)

Sets the AggregateFactory used to create new Aggregate instances.

Parameters:

aggregateFactory - the AggregateFactory used to create new Aggregate instances

Returns:

the current Builder instance, for fluent interfacing

repositoryProvider

public EventSourcingRepository.Builder<T> repositoryProvider(RepositoryProvider repositoryProvider)

Sets the RepositoryProvider which services repositories for specific aggregate types.

Parameters:

repositoryProvider - a RepositoryProvider servicing repositories for specific aggregate types

Returns:

the current Builder instance, for fluent interfacing

cache

public EventSourcingRepository.Builder<T> cache(Cache cache)

Sets the Cache which services repositories for specific aggregate types.

Parameters:

cache - a Cache servicing repositories for specific aggregate types

Returns:

the current Builder instance, for fluent interfacing

eventStreamFilter

public EventSourcingRepository.Builder<T> eventStreamFilter(Predicate<? super DomainEventMessage<?>> filter)

Sets the Predicate used to filter events when reading from the EventStore. By default, all events with the Aggregate identifier passed to EventSourcingRepository.readEvents(String) are returned. Calls to filterByAggregateType() will overwrite this configuration and vice versa.

Parameters:

filter - a Predicate that may return false to discard events.

filterByAggregateType

public EventSourcingRepository.Builder<T> filterByAggregateType()

Configures a filter that rejects events with a different Aggregate type than the one specified by this Repository's AggregateModel. This may be used to enable multiple Aggregate types to share overlapping Aggregate identifiers. Calls to eventStreamFilter(Predicate) will overwrite this configuration and vice versa.

If the caller supplies an explicit AggregateModel to this Builder, that must be done before calling this method.

build

public <R extends EventSourcingRepository<T>> R build()

Initializes a EventSourcingRepository or CachingEventSourcingRepository as specified through this Builder. Will return a CachingEventSourcingRepository if cache(Cache) has been set. Otherwise builds a regular EventSourcingRepository

Type Parameters:

R - a generic extending EventSourcingRepository, so allowing both an EventSourcingRepository and CachingEventSourcingRepository return type

Returns:

a EventSourcingRepository or CachingEventSourcingRepository (if cache(Cache) has been set) as specified through this Builder

validate

protected void validate()

Description copied from class: AbstractRepository.Builder

Validates whether the fields contained in this Builder are set accordingly.

Overrides:

validate in class AbstractRepository.Builder<T>