/**
* 使用指定的 聚合工厂 和 聚合 事件仓储 初始化
*
* @param aggregateFactory The factory for new aggregate instances
* @param AggregateEventStore The event store that holds the event streams for this repository
*/
public EventSourcingRepository(
final AggregateFactory<T> aggregateFactory, AggregateEventStore AggregateEventStore) {
super(aggregateFactory.getAggregateType());
Assert.notNull(AggregateEventStore, "AggregateEventStore may not be null");
this.aggregateFactory = aggregateFactory;
this.AggregateEventStore = AggregateEventStore;
}
/**
* 根据聚合标识符和 指定 版本加载 聚合
*
* @param aggregateIdentifier the identifier of the aggregate to load
* @param expectedVersion The expected version of the loaded aggregate
* @return the fully initialized aggregate
*/
@Override
protected T doLoad(ID aggregateIdentifier, final Long expectedVersion) {
AggregateEventStream events = null;
AggregateEventStream originalStream = null;
try {
try {
events = AggregateEventStore.readEvents(getTypeIdentifier(), aggregateIdentifier);
} catch (EventStreamNotFoundException e) {
throw new AggregateNotFoundException(aggregateIdentifier, "The aggregate was not found", e);
}
originalStream = events;
for (EventStreamDecorator decorator : eventStreamDecorators) {
events = decorator.decorateForRead(getTypeIdentifier(), aggregateIdentifier, events);
}
final T aggregate = aggregateFactory.createAggregate(aggregateIdentifier, events.peek());
List<AggregateEvent> unseenEvents = new ArrayList<AggregateEvent>();
aggregate.initializeState(new CapturingEventStream(events, unseenEvents, expectedVersion));
if (aggregate.isDeleted()) {
throw new AggregateDeletedException(aggregateIdentifier);
}
CurrentUnitOfWork.get()
.registerListener(new ConflictResolvingListener(aggregate, unseenEvents));
return aggregate;
} finally {
IOUtils.closeQuietlyIfCloseable(events);
// if a decorator doesn't implement closeable, we still want to be sure we close the original
// stream
IOUtils.closeQuietlyIfCloseable(originalStream);
}
}
public String getTypeIdentifier() {
if (aggregateFactory == null) {
throw new IllegalStateException(
"Either an aggregate factory must be configured (recommended), "
+ "or the getTypeIdentifier() method must be overridden.");
}
return aggregateFactory.getTypeIdentifier();
}
/**
* 使用指定的 锁 机制 初始化
*
* @param aggregateFactory The factory for new aggregate instances
* @param AggregateEventStore The event store that holds the event streams for this repository
* @param lockManager the locking strategy to apply to this repository
*/
public EventSourcingRepository(
AggregateFactory<T> aggregateFactory,
AggregateEventStore AggregateEventStore,
LockManager lockManager) {
super(aggregateFactory.getAggregateType(), lockManager);
Assert.notNull(AggregateEventStore, "AggregateEventStore may not be null");
this.AggregateEventStore = AggregateEventStore;
this.aggregateFactory = aggregateFactory;
}