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This library focuses on providing different flavors of eventsourced aggregrates
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/*
* Copyright 2021-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dk.cloudcreate.essentials.components.eventsourced.aggregates.stateful;
import dk.cloudcreate.essentials.components.eventsourced.aggregates.*;
import dk.cloudcreate.essentials.components.eventsourced.aggregates.snapshot.*;
import dk.cloudcreate.essentials.components.eventsourced.aggregates.stateful.classic.Event;
import dk.cloudcreate.essentials.components.eventsourced.eventstore.postgresql.*;
import dk.cloudcreate.essentials.components.eventsourced.eventstore.postgresql.eventstream.*;
import dk.cloudcreate.essentials.components.eventsourced.eventstore.postgresql.persistence.*;
import dk.cloudcreate.essentials.components.eventsourced.eventstore.postgresql.types.EventOrder;
import dk.cloudcreate.essentials.components.foundation.transaction.*;
import dk.cloudcreate.essentials.shared.types.GenericType;
import dk.cloudcreate.essentials.types.LongRange;
import org.slf4j.*;
import java.util.*;
import java.util.concurrent.atomic.AtomicReference;
import static dk.cloudcreate.essentials.shared.FailFast.requireNonNull;
/**
* Opinionated {@link Aggregate} Repository that's built to persist and load a specific {@link StatefulAggregate} type in combination
* with {@link EventStore}, {@link UnitOfWorkFactory} and a {@link StatefulAggregateInstanceFactory}.
* You can use the {@link #from(ConfigurableEventStore, AggregateEventStreamConfiguration, StatefulAggregateInstanceFactory, Class)} to create a new {@link StatefulAggregateRepository}
* instance that supports the most common repository method.
* Alternatively you can extend from the {@link DefaultStatefulAggregateRepository} and add your own special methods
*
* @param the aggregate id type (aka stream-id)
* @param the type of event
* @param the aggregate implementation type
* @see DefaultStatefulAggregateRepository
*/
public interface StatefulAggregateRepository> {
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - the {@link EventStore} will be configured with the supplied eventStreamConfiguration.
* This factory method will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* If that fails please use {@link #from(ConfigurableEventStore, AggregateEventStreamConfiguration, StatefulAggregateInstanceFactory, Class, Class)}
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param eventStreamConfiguration the configuration for the event stream that will contain all the events related to the aggregate type
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateImplementationType the concrete aggregate implementation type (MUST be a subtype of {@link StatefulAggregate}).
* It will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
@SuppressWarnings("unchecked")
static >
StatefulAggregateRepository from(ConfigurableEventStore eventStore,
CONFIG eventStreamConfiguration,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateImplementationType) {
requireNonNull(aggregateImplementationType, "No aggregateImplementationType provided");
return new DefaultStatefulAggregateRepository<>(eventStore,
eventStreamConfiguration,
aggregateRootInstanceFactory,
(Class) GenericType.resolveGenericTypeOnSuperClass(aggregateImplementationType, 0),
aggregateImplementationType,
null);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - the {@link EventStore} will be configured with the supplied eventStreamConfiguration.
* This factory method will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* If that fails please use {@link #from(ConfigurableEventStore, AggregateEventStreamConfiguration, StatefulAggregateInstanceFactory, Class, Class)}
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param eventStreamConfiguration the configuration for the event stream that will contain all the events related to the aggregate type
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateImplementationType the concrete aggregate implementation type (MUST be a subtype of {@link StatefulAggregate}).
* It will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* @param aggregateSnapshotRepository optional (may be null) {@link AggregateSnapshotRepository}
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
@SuppressWarnings("unchecked")
static >
StatefulAggregateRepository from(ConfigurableEventStore eventStore,
CONFIG eventStreamConfiguration,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateImplementationType,
AggregateSnapshotRepository aggregateSnapshotRepository) {
requireNonNull(aggregateImplementationType, "No aggregateImplementationType provided");
return new DefaultStatefulAggregateRepository<>(eventStore,
eventStreamConfiguration,
aggregateRootInstanceFactory,
(Class) GenericType.resolveGenericTypeOnSuperClass(aggregateImplementationType, 0),
aggregateImplementationType,
aggregateSnapshotRepository);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - if missing, the {@link EventStore} will be configured with the
* default {@link AggregateEventStreamConfiguration} based on the {@link AggregateEventStreamConfigurationFactory} that the {@link EventStore}'s {@link AggregateEventStreamPersistenceStrategy}
* is configured with
* This factory method will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* If that fails please use {@link #from(ConfigurableEventStore, AggregateEventStreamConfiguration, StatefulAggregateInstanceFactory, Class, Class)}
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param aggregateType the aggregate type being handled by this repository
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateImplementationType the concrete aggregate implementation type (MUST be a subtype of {@link StatefulAggregate}).
* It will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
@SuppressWarnings("unchecked")
static > StatefulAggregateRepository from(ConfigurableEventStore eventStore,
AggregateType aggregateType,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateImplementationType) {
requireNonNull(aggregateImplementationType, "No aggregateImplementationType provided");
return new DefaultStatefulAggregateRepository<>(eventStore,
aggregateType,
aggregateRootInstanceFactory,
(Class) GenericType.resolveGenericTypeOnSuperClass(aggregateImplementationType, 0),
aggregateImplementationType,
null);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - if missing, the {@link EventStore} will be configured with the
* default {@link AggregateEventStreamConfiguration} based on the {@link AggregateEventStreamConfigurationFactory} that the {@link EventStore}'s {@link AggregateEventStreamPersistenceStrategy}
* is configured with
* This factory method will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* If that fails please use {@link #from(ConfigurableEventStore, AggregateEventStreamConfiguration, StatefulAggregateInstanceFactory, Class, Class)}
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param aggregateType the aggregate type being handled by this repository
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateImplementationType the concrete aggregate implementation type (MUST be a subtype of {@link StatefulAggregate}).
* It will try to resolve the Aggregate Id type from the aggregateImplementationType type parameters
* @param aggregateSnapshotRepository optional (may be null) {@link AggregateSnapshotRepository}
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
@SuppressWarnings("unchecked")
static >
StatefulAggregateRepository from(ConfigurableEventStore eventStore,
AggregateType aggregateType,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateImplementationType,
AggregateSnapshotRepository aggregateSnapshotRepository) {
requireNonNull(aggregateImplementationType, "No aggregateImplementationType provided");
return new DefaultStatefulAggregateRepository<>(eventStore,
aggregateType,
aggregateRootInstanceFactory,
(Class) GenericType.resolveGenericTypeOnSuperClass(aggregateImplementationType, 0),
aggregateImplementationType,
aggregateSnapshotRepository);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - the {@link EventStore} will be configured with the supplied eventStreamConfiguration
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param eventStreamConfiguration the configuration for the event stream that will contain all the events related to the aggregate type
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateIdType the concrete aggregate ID type
* @param aggregateImplementationType the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
static > StatefulAggregateRepository from(ConfigurableEventStore eventStore,
CONFIG eventStreamConfiguration,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateIdType,
Class aggregateImplementationType) {
return new DefaultStatefulAggregateRepository<>(eventStore,
eventStreamConfiguration,
aggregateRootInstanceFactory,
aggregateIdType,
aggregateImplementationType,
null);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - the {@link EventStore} will be configured with the supplied eventStreamConfiguration
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param eventStreamConfiguration the configuration for the event stream that will contain all the events related to the aggregate type
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateIdType the concrete aggregate ID type
* @param aggregateImplementationType the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param aggregateSnapshotRepository optional (may be null) {@link AggregateSnapshotRepository}
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
static >
StatefulAggregateRepository from(ConfigurableEventStore eventStore,
CONFIG eventStreamConfiguration,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateIdType,
Class aggregateImplementationType,
AggregateSnapshotRepository aggregateSnapshotRepository) {
return new DefaultStatefulAggregateRepository<>(eventStore,
eventStreamConfiguration,
aggregateRootInstanceFactory,
aggregateIdType,
aggregateImplementationType,
aggregateSnapshotRepository);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - if missing, the {@link EventStore} will be configured with the
* default {@link AggregateEventStreamConfiguration} based on the {@link AggregateEventStreamConfigurationFactory} that the {@link EventStore}'s {@link AggregateEventStreamPersistenceStrategy}
* is configured with
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param aggregateType the aggregate type being handled by this repository
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateIdType the concrete aggregate ID type
* @param aggregateImplementationType the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
static > StatefulAggregateRepository from(ConfigurableEventStore eventStore,
AggregateType aggregateType,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateIdType,
Class aggregateImplementationType) {
return new DefaultStatefulAggregateRepository<>(eventStore,
aggregateType,
aggregateRootInstanceFactory,
aggregateIdType,
aggregateImplementationType,
null);
}
/**
* Create an {@link StatefulAggregateRepository} instance that supports loading and persisting the given Aggregate type - if missing, the {@link EventStore} will be configured with the
* default {@link AggregateEventStreamConfiguration} based on the {@link AggregateEventStreamConfigurationFactory} that the {@link EventStore}'s {@link AggregateEventStreamPersistenceStrategy}
* is configured with
*
* @param the aggregate type configuration
* @param the aggregate ID type
* @param the type of event
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param eventStore the {@link EventStore} instance to use
* @param aggregateType the aggregate type being handled by this repository
* @param aggregateRootInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateIdType the concrete aggregate ID type
* @param aggregateImplementationType the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param aggregateSnapshotRepository optional (may be null) {@link AggregateSnapshotRepository}
* @return a repository instance that can be used load, add and query aggregates of type aggregateType
*/
static >
StatefulAggregateRepository from(ConfigurableEventStore eventStore,
AggregateType aggregateType,
StatefulAggregateInstanceFactory aggregateRootInstanceFactory,
Class aggregateIdType,
Class aggregateImplementationType,
AggregateSnapshotRepository aggregateSnapshotRepository) {
return new DefaultStatefulAggregateRepository<>(eventStore,
aggregateType,
aggregateRootInstanceFactory,
aggregateIdType,
aggregateImplementationType,
aggregateSnapshotRepository);
}
// -------------------------------------------------------------------------------------------------------------------------------------------------
/**
* Try to load an {@link StatefulAggregate} instance with the specified aggregateId from the underlying {@link EventStore}
* If the aggregate instance exists it will be associated with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* and any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregateId the id of the aggregate we want to load
* @param expectedLatestEventOrder the expected {@link Event#eventOrder()} of the last event stored in relation to the given aggregate instance
* @return an {@link Optional} with the matching {@link StatefulAggregate} instance if it exists, otherwise it will return an {@link Optional#empty()}
* @throws OptimisticAggregateLoadException in case the {@link Event#eventOrder()} of the last event stored in relation to the given aggregate instance
* is different from the expectedLatestEventOrder
*/
default Optional tryLoad(ID aggregateId, EventOrder expectedLatestEventOrder) {
return tryLoad(aggregateId, Optional.of(expectedLatestEventOrder));
}
/**
* Try to load an {@link StatefulAggregate} instance with the specified aggregateId from the underlying {@link EventStore}
* If the aggregate instance exists it will be associated with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* and any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregateId the id of the aggregate we want to load
* @param expectedLatestEventOrder option with the expected {@link Event#eventOrder()} of the last event stored in relation to the given aggregate instance (if any)
* @return an {@link Optional} with the matching {@link StatefulAggregate} instance if it exists, otherwise it will return an {@link Optional#empty()}
* @throws OptimisticAggregateLoadException in case the {@link Event#eventOrder()} of the last event stored in relation to the given aggregate instance
* is different from the expectedLatestEventOrder
*/
Optional tryLoad(ID aggregateId, Optional expectedLatestEventOrder);
/**
* Try to load an {@link StatefulAggregate} instance with the specified aggregateId from the underlying {@link EventStore}
* If the aggregate instance exists it will be associated with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* and any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregateId the id of the aggregate we want to load
* @return an {@link Optional} with the matching {@link StatefulAggregate} instance if it exists, otherwise it will return an {@link Optional#empty()}
* @throws OptimisticAggregateLoadException in case the {@link Event#eventOrder()} of the last event stored in relation to the given aggregate instance
* is different from the expectedLatestEventOrder
*/
default Optional tryLoad(ID aggregateId) {
return tryLoad(aggregateId, Optional.empty());
}
/**
* Load an {@link StatefulAggregate} instance with the specified aggregateId from the underlying {@link EventStore}
* The loaded aggregate instance will be associated with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* and any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregateId the id of the aggregate we want to load
* @return an {@link Optional} with the matching {@link StatefulAggregate} instance
* @throws AggregateNotFoundException in case a matching {@link StatefulAggregate} doesn't exist in the {@link EventStore}
*/
default AGGREGATE_IMPL_TYPE load(ID aggregateId) {
return tryLoad(aggregateId).orElseThrow(() -> new AggregateNotFoundException(aggregateId, aggregateRootImplementationType(), aggregateType()));
}
/**
* Load an {@link StatefulAggregate} instance with the specified aggregateId from the underlying {@link EventStore}
* The loaded aggregate instance will be associated with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* and any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregateId the id of the aggregate we want to load
* @param expectedLatestEventOrder the expected {@link Event#eventOrder()} of the last event stored in relation to the given aggregate instance
* @return an {@link Optional} with the matching {@link StatefulAggregate} instance
* @throws AggregateNotFoundException in case a matching {@link StatefulAggregate} doesn't exist in the {@link EventStore}
*/
default AGGREGATE_IMPL_TYPE load(ID aggregateId, EventOrder expectedLatestEventOrder) {
return tryLoad(aggregateId, expectedLatestEventOrder).orElseThrow(() -> new AggregateNotFoundException(aggregateId, aggregateRootImplementationType(), aggregateType()));
}
/**
* Save/Associate a newly created and not yet persisted {@link StatefulAggregate} instance with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* Any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregate the aggregate instance to persist to the underlying {@link EventStore}
* @return the persisted aggregate
*/
AGGREGATE_IMPL_TYPE save(AGGREGATE_IMPL_TYPE aggregate);
/**
* Save/Associate a newly created and not yet persisted {@link StatefulAggregate} instance with the {@link UnitOfWorkFactory#getRequiredUnitOfWork()}
* Any changes to will be tracked and will be persisted to the underlying {@link EventStore} when the {@link UnitOfWork}
* is committed.
*
* @param aggregate the aggregate instance to persist to the underlying {@link EventStore}
* @return the persisted aggregate
* @deprecated Use {@link #save(StatefulAggregate)} instead
*/
@Deprecated
default void persist(AGGREGATE_IMPL_TYPE aggregate) {
save(aggregate);
}
// TODO: Add loadReadOnly (that doesn't require a UnitOfWork), getAllAggregateId's, loadByIds, loadAll, query, etc.
/**
* The type of aggregate ID this repository uses
*/
Class aggregateIdType();
/**
* The type of {@link StatefulAggregate} implementation this repository handles
*/
Class aggregateRootImplementationType();
/**
* The type of {@link AggregateType} this repository is using to persist Events
*/
AggregateType aggregateType();
// -------------------------------------------------------------------------------------------------------------------------------------------------
/**
* Default {@link StatefulAggregateRepository} implementation. You can extend this class directly if you need to expand the supported method or
* use {@link StatefulAggregateRepository#from(ConfigurableEventStore, AggregateEventStreamConfiguration, StatefulAggregateInstanceFactory, Class, Class)} to create a default instance
*
* @param the aggregate ID type
* @param the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
*/
class DefaultStatefulAggregateRepository> implements StatefulAggregateRepository {
private static final Logger log = LoggerFactory.getLogger(StatefulAggregateRepository.class);
private final EventStore eventStore;
private final Class aggregateImplementationType;
private final Class aggregateIdType;
private final StatefulAggregateRepositoryUnitOfWorkLifecycleCallback unitOfWorkCallback;
private final StatefulAggregateInstanceFactory aggregateRootInstanceFactory;
private final AggregateType aggregateType;
private final Optional aggregateSnapshotRepository;
/**
* Create an {@link StatefulAggregateRepository} - the {@link EventStore} will be configured with the supplied eventStreamConfiguration.
*
* @param eventStore the {@link EventStore} instance to use - the {@link EventStore} will be configured with the supplied eventStreamConfiguration
* @param aggregateEventStreamConfiguration the configuration for the event stream that will contain all the events related to the aggregate type
* @param statefulAggregateInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateIdType the concrete aggregate ID type
* @param aggregateImplementationType the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param aggregateSnapshotRepository optional (may be null) {@link AggregateSnapshotRepository}
*/
private DefaultStatefulAggregateRepository(ConfigurableEventStore eventStore,
CONFIG aggregateEventStreamConfiguration,
StatefulAggregateInstanceFactory statefulAggregateInstanceFactory,
Class aggregateIdType,
Class aggregateImplementationType,
AggregateSnapshotRepository aggregateSnapshotRepository) {
this.eventStore = requireNonNull(eventStore, "You must supply an EventStore instance");
this.aggregateType = requireNonNull(aggregateEventStreamConfiguration, "You must supply an aggregateType").aggregateType;
this.aggregateRootInstanceFactory = requireNonNull(statefulAggregateInstanceFactory, "You must supply a AggregateRootFactory instance");
this.aggregateImplementationType = requireNonNull(aggregateImplementationType, "You must supply an aggregateImplementationType");
this.aggregateIdType = requireNonNull(aggregateIdType, "You must supply an aggregateIdType");
this.aggregateSnapshotRepository = Optional.ofNullable(aggregateSnapshotRepository);
unitOfWorkCallback = new StatefulAggregateRepositoryUnitOfWorkLifecycleCallback();
eventStore.addAggregateEventStreamConfiguration(aggregateEventStreamConfiguration);
eventStore.addSpecificInMemoryProjector(aggregateImplementationType, new StatefulAggregateInMemoryProjector(statefulAggregateInstanceFactory));
}
/**
* Create an {@link StatefulAggregateRepository} - if missing, the {@link EventStore} will be configured with the
* default {@link AggregateEventStreamConfiguration} based on the {@link AggregateEventStreamConfigurationFactory} that the {@link EventStore}'s {@link AggregateEventStreamPersistenceStrategy}
* is configured with
*
* @param eventStore the {@link EventStore} instance to use
* @param aggregateType the aggregate type being handled by this repository
* @param statefulAggregateInstanceFactory the factory responsible for instantiating your {@link StatefulAggregate}'s when loading them from the {@link EventStore}
* @param aggregateIdType the concrete aggregate ID type
* @param aggregateImplementationType the concrete aggregate type (MUST be a subtype of {@link StatefulAggregate})
* @param aggregateSnapshotRepository optional (may be null) {@link AggregateSnapshotRepository}
*/
private DefaultStatefulAggregateRepository(ConfigurableEventStore eventStore,
AggregateType aggregateType,
StatefulAggregateInstanceFactory statefulAggregateInstanceFactory,
Class aggregateIdType,
Class aggregateImplementationType,
AggregateSnapshotRepository aggregateSnapshotRepository) {
this.eventStore = requireNonNull(eventStore, "You must supply an EventStore instance");
this.aggregateType = requireNonNull(aggregateType, "You must supply an aggregateType");
this.aggregateRootInstanceFactory = requireNonNull(statefulAggregateInstanceFactory, "You must supply a AggregateRootFactory instance");
this.aggregateImplementationType = requireNonNull(aggregateImplementationType, "You must supply an aggregateImplementationType");
this.aggregateIdType = requireNonNull(aggregateIdType, "You must supply an aggregateIdType");
this.aggregateSnapshotRepository = Optional.ofNullable(aggregateSnapshotRepository);
unitOfWorkCallback = new StatefulAggregateRepositoryUnitOfWorkLifecycleCallback();
if (eventStore.findAggregateEventStreamConfiguration(aggregateType).isEmpty()) {
eventStore.addAggregateEventStreamConfiguration(aggregateType,
aggregateIdType);
}
eventStore.addSpecificInMemoryProjector(aggregateImplementationType, new StatefulAggregateInMemoryProjector(statefulAggregateInstanceFactory));
}
/**
* The {@link EventStore} that's being used for support
*/
protected EventStore eventStore() {
return eventStore;
}
@Override
public String toString() {
return "AggregateRootRepository{" +
"aggregateType=" + aggregateType +
"aggregateImplementationType=" + aggregateRootImplementationType() +
"aggregateIdType=" + aggregateIdType() +
'}';
}
@SuppressWarnings("unchecked")
@Override
public Optional tryLoad(ID aggregateId, Optional expectedLatestEventOrder) {
log.trace("Trying to load {} with id '{}' and expectedLatestEventOrder {}", aggregateImplementationType.getName(), aggregateId, expectedLatestEventOrder);
var unitOfWork = eventStore.getUnitOfWorkFactory().getRequiredUnitOfWork();
Optional aggregateSnapshot = aggregateSnapshotRepository.flatMap(repository -> repository.loadSnapshot(aggregateType,
aggregateId,
aggregateRootImplementationType()));
if (aggregateSnapshot.isPresent() && aggregateSnapshot.get().aggregateSnapshot instanceof BrokenSnapshot) {
log.debug("[{}:{}] Broken '{}' SNAPSHOT with eventOrderOfLastIncludedEvent: {}",
aggregateType, aggregateId, aggregateImplementationType.getName(), aggregateSnapshot.get().eventOrderOfLastIncludedEvent);
aggregateSnapshotRepository.get().deleteSnapshots(aggregateType,
aggregateId,
aggregateImplementationType,
List.of(aggregateSnapshot.get().eventOrderOfLastIncludedEvent));
}
long loadMoreEventsWithEventOrderFromAndIncluding = aggregateSnapshot.map(snapshot -> {
var nextEventOrder = snapshot.eventOrderOfLastIncludedEvent.increment();
log.debug("[{}:{}] Using '{}' SNAPSHOT (globalEventOrderOfLastIncludedEvent + 1) as loadFromEventOrder: {}",
aggregateType, aggregateId, aggregateImplementationType.getName(), nextEventOrder);
return nextEventOrder.longValue();
})
.orElse(EventOrder.FIRST_EVENT_ORDER.longValue());
log.debug("Loading [{}:{}] of aggregate-implementation-type '{}' using loadMoreEventsWithEventOrderFromAndIncluding: {}",
aggregateType, aggregateId, aggregateImplementationType.getName(), loadMoreEventsWithEventOrderFromAndIncluding);
var potentialPersistedEventStream = eventStore.fetchStream(aggregateType,
aggregateId,
LongRange.from(loadMoreEventsWithEventOrderFromAndIncluding));
if (aggregateSnapshot.isPresent() && potentialPersistedEventStream.isEmpty()) {
log.trace("[{}:{}] Didn't find a any {} events persisted after eventOrder: {}. Has SNAPSHOT: {}",
aggregateType, aggregateId, aggregateImplementationType.getName(), loadMoreEventsWithEventOrderFromAndIncluding, aggregateSnapshot.isPresent());
return aggregateSnapshot.map(snapshot -> {
log.trace("[{}:{}] Returning '{}' SNAPSHOT as it's up-to-date as of eventOrderOfLastIncludedEvent: {}",
aggregateType, aggregateId, aggregateImplementationType.getName(), aggregateSnapshot.get().eventOrderOfLastIncludedEvent);
return (AGGREGATE_IMPL_TYPE) snapshot.aggregateSnapshot;
});
} else if (aggregateSnapshot.isEmpty() && potentialPersistedEventStream.isEmpty()) {
return Optional.empty();
} else {
var persistedEventsStream = potentialPersistedEventStream.get();
if (expectedLatestEventOrder.isPresent()) {
PersistedEvent lastEventPersisted = persistedEventsStream.eventList().get(persistedEventsStream.eventList().size() - 1);
if (!lastEventPersisted.eventOrder().equals(expectedLatestEventOrder.get())) {
log.trace("Found {} with id '{}' but expectedLatestEventOrder {} != actualLatestEventOrder {}",
aggregateImplementationType.getName(),
aggregateId,
expectedLatestEventOrder.get(),
lastEventPersisted.eventOrder());
throw new OptimisticAggregateLoadException(aggregateId,
aggregateImplementationType,
expectedLatestEventOrder.get(),
lastEventPersisted.eventOrder());
}
}
log.debug("[{}:{}] Found '{}' with expectedLatestEventOrder: {}. Has SNAPSHOT: {}",
aggregateIdType.getName(), aggregateId, aggregateImplementationType.getName(), expectedLatestEventOrder, aggregateSnapshot.isPresent());
AGGREGATE_IMPL_TYPE aggregate = aggregateSnapshot.map(snapshot -> (AGGREGATE_IMPL_TYPE) snapshot.aggregateSnapshot)
.orElseGet(() -> aggregateRootInstanceFactory.create(aggregateId, aggregateImplementationType));
return Optional.of(unitOfWork.registerLifecycleCallbackForResource(aggregate.rehydrate(persistedEventsStream),
unitOfWorkCallback));
}
}
@Override
public AGGREGATE_IMPL_TYPE save(AGGREGATE_IMPL_TYPE aggregate) {
log.debug("Adding {} with id '{}' to the current UnitOfWork so it will be persisted at commit time", aggregateImplementationType.getName(), aggregate.aggregateId());
eventStore.getUnitOfWorkFactory()
.getRequiredUnitOfWork()
.registerLifecycleCallbackForResource(aggregate, unitOfWorkCallback);
return aggregate;
}
@Override
public Class aggregateIdType() {
return aggregateIdType;
}
@Override
public Class aggregateRootImplementationType() {
return aggregateImplementationType;
}
@Override
public AggregateType aggregateType() {
return aggregateType;
}
/**
* The {@link UnitOfWorkLifecycleCallback} that's responsible for persisting {@link Event}'s applied to {@link StatefulAggregate}'s during the {@link UnitOfWork} they were
* {@link StatefulAggregateRepository#load(Object)}/{@link StatefulAggregateRepository#tryLoad(Object)}/.... and {@link StatefulAggregateRepository#save(StatefulAggregate)}
*/
private class StatefulAggregateRepositoryUnitOfWorkLifecycleCallback implements UnitOfWorkLifecycleCallback {
@Override
public BeforeCommitProcessingStatus beforeCommit(UnitOfWork unitOfWork, List associatedResources) {
log.trace("beforeCommit processing {} '{}' registered with the UnitOfWork being committed", associatedResources.size(), aggregateImplementationType.getName());
var processingStatus = new AtomicReference<>(BeforeCommitProcessingStatus.COMPLETED);
associatedResources.forEach(aggregate -> {
log.trace("beforeCommit processing '{}' with id '{}'", aggregateImplementationType.getName(), aggregate.aggregateId());
var eventsToPersist = aggregate.getUncommittedChanges();
if (eventsToPersist.isEmpty()) {
log.trace("No changes detected for '{}' with id '{}'", aggregateImplementationType.getName(), aggregate.aggregateId());
} else {
if (log.isTraceEnabled()) {
log.trace("Persisting {} event(s) related to '{}' with id '{}': {}",
eventsToPersist.events.size(),
aggregateImplementationType.getName(),
aggregate.aggregateId(),
eventsToPersist.stream()
.map(persistableEvent -> persistableEvent.getClass().getName())
.reduce((s, s2) -> s + ", " + s2));
} else {
log.debug("Persisting {} event(s) related to '{}' with id '{}'",
eventsToPersist.events.size(),
aggregateImplementationType.getName(),
aggregate.aggregateId());
}
aggregate.markChangesAsCommitted();
var persistedEvents = eventStore.appendToStream(aggregateType,
eventsToPersist.aggregateId,
eventsToPersist.eventOrderOfLastRehydratedEvent,
eventsToPersist.events);
aggregateSnapshotRepository.ifPresent(repository -> repository.aggregateUpdated(aggregate, persistedEvents));
processingStatus.set(BeforeCommitProcessingStatus.REQUIRED);
}
});
return processingStatus.get();
}
@Override
public void afterCommit(UnitOfWork unitOfWork, java.util.List associatedResources) {
}
@Override
public void beforeRollback(UnitOfWork unitOfWork, java.util.List associatedResources, Exception causeOfTheRollback) {
}
@Override
public void afterRollback(UnitOfWork unitOfWork, java.util.List associatedResources, Exception causeOfTheRollback) {
}
}
}
}
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