/// <summary>
/// 根据给定的聚合根类型及其事件重建一个聚合根对象，该对象只用于显示，不能参与任何业务逻辑；
/// 所以，该方法不允许在正常业务逻辑的代码中使用，该方法返回的聚合根也不受工作单元监控，只能用于查看聚合根在某个事件版本时的状态；
/// </summary>
public static AggregateRoot BuildAggregateRootForViewOnly(Type aggregateRootType, IEnumerable <AggregateRootEvent> evnts)
{
if (aggregateRootType == null)
{
throw new ArgumentNullException("TAggregateRoot");
}
if (evnts == null)
{
throw new ArgumentNullException("evnts");
}
AggregateRoot aggregateRoot = null;
if (evnts.Count() > 0)
{
aggregateRoot = DependencyResolver.Resolve <IAggregateRootFactory>().CreateAggregateRoot(aggregateRootType);
aggregateRoot.ReplayEvents(evnts);
}
return(aggregateRoot);
}
/// <summary>
/// 尝试从快照获取聚合根
/// </summary>
private bool TryGetFromSnapshot(string aggregateRootId, long maxEventVersion, out T aggregateRoot)
{
aggregateRoot = null;
var snapshot = _snapshotStoreProvider.GetSnapshotStore <T>().GetLastSnapshot(aggregateRootId, maxEventVersion);
if (snapshot != null && snapshot.IsValid())
{
T aggregateRootFromSnapshot = DependencyResolver.Resolve <ISnapshotter>().RestoreFromSnapshot(snapshot) as T;
if (aggregateRootFromSnapshot != null)
{
//验证从快照还原出来的聚合根是否有效
ValidateAggregateRootFromSnapshot(aggregateRootFromSnapshot, aggregateRootId);
//如果从快照得到的聚合根有效，则将发生在该快照之后的事件进行重演
var committedEventsAfterSnapshot = _eventStoreProvider.GetEventStore <T>().GetEvents(aggregateRootId, snapshot.Version + 1, maxEventVersion);
aggregateRootFromSnapshot.ReplayEvents(committedEventsAfterSnapshot);
aggregateRoot = aggregateRootFromSnapshot;
return(true);
}
}
return(false);
}
/// <summary>
/// 注册组件到容器
/// </summary>
public Configuration RegisterComponents(params Assembly[] assemblies)
{
DependencyResolver.RegisterType(typeof(DefaultAggregateRootTypeProvider));
DependencyResolver.RegisterType(typeof(DefaultAggregateRootEventCallbackMetaDataProvider));
DependencyResolver.RegisterType(typeof(DefaultDomainHandlerMetaDataProvider));
DependencyResolver.RegisterType(typeof(DefaultAggregateRootEventTypeProvider));
DependencyResolver.RegisterType(typeof(DefaultSnapshotTypeProvider));
DependencyResolver.RegisterType(typeof(DefaultTypeNameMapper));
DependencyResolver.RegisterType(typeof(DefaultSyncMessageBus));
DependencyResolver.RegisterType(typeof(Log4NetLoggerFactory));
DependencyResolver.RegisterType(typeof(DefaultAggregateRootFactory));
DependencyResolver.RegisterType(typeof(JsonNetSerializer));
DependencyResolver.RegisterType(typeof(DefaultSnapshotter));
DependencyResolver.RegisterType(typeof(NoSnapshotPolicy));
DependencyResolver.RegisterType(typeof(Repository));
DependencyResolver.RegisterType(typeof(JsonMessageSerializer));
DependencyResolver.RegisterType(typeof(InMemorySubscriptionStorage));
DependencyResolver.RegisterType(typeof(MsmqMessageTransport));
DependencyResolver.RegisterType(typeof(DefaultAsyncMessageBus));
DependencyResolver.Resolve <IAggregateRootTypeProvider>().RegisterAllAggregateRootTypesInAssemblies(assemblies);
DependencyResolver.Resolve <IAggregateRootEventCallbackMetaDataProvider>().RegisterAllEventCallbackMetaDataInAssemblies(assemblies);
DependencyResolver.Resolve <IDomainHandlerMetaDataProvider>().RegisterAllEventSubscribersInAssemblies(assemblies);
DependencyResolver.RegisterTypes(TypeUtils.IsComponent, assemblies);
DependencyResolver.RegisterTypes(TypeUtils.IsRepository, assemblies);
DependencyResolver.RegisterTypes(TypeUtils.IsService, assemblies);
DependencyResolver.RegisterTypes(TypeUtils.IsEventStore, assemblies);
DependencyResolver.RegisterTypes(TypeUtils.IsSnapshotStore, assemblies);
RegisterTypeNameMappings(assemblies);
RegisterAggregateRootEvents(assemblies);
InitializeSyncMessageBus(assemblies);
return(this);
}
/// <summary>
/// 在领域中以加锁的方式唤醒指定ID的聚合根并返回该聚合根。
/// <remarks>
/// 该方法的使用背景：
/// 在应用EventSourcing的架构下，我们一般通过ID来关联聚合根；正因为这个原因导致如果我们要从
/// 一个聚合根想去导航到另一个聚合根实现某种交互时，必须通过某种容易理解的措施获取ID所对应的聚合根的引用；
/// 出于这个目的，我们在框架中提供此方法可以让当前聚合根能够方便地在领域中“唤醒”某个指定的聚合根。
/// </remarks>
/// </summary>
/// <param name="id">要唤醒的聚合根的ID</param>
protected T WakeupAggregateRootWithLock <T>(object id) where T : AggregateRoot
{
AssertCurrentAggregateRoot();
return(DependencyResolver.Resolve <IRepository>().GetByIdWithLock <T>(id));
}
