private async Task <AggregateState> GetRehydratedStateAsync <TId>(TId aggregateUniqueId, Type aggregateType)
{
var events = await GetAllEventsByAggregateId(aggregateType, aggregateUniqueId).ToList().ConfigureAwait(false);
var snapshot = await GetSnapshotFromAggregateId(aggregateUniqueId, aggregateType).ConfigureAwait(false);
PropertyInfo stateProp = aggregateType.GetAllProperties().FirstOrDefault(p => p.PropertyType.IsSubclassOf(typeof(AggregateState)));
FieldInfo stateField = aggregateType.GetAllFields().FirstOrDefault(f => f.FieldType.IsSubclassOf(typeof(AggregateState)));
Type stateType = stateProp?.PropertyType ?? stateField?.FieldType;
AggregateState state = null;
if (stateType != null)
{
if (snapshot != null)
{
state = snapshot.AggregateState;
}
else
{
state = stateType.CreateInstance() as AggregateState;
}
}
else
{
throw new InvalidOperationException("MongoDbEventStore.GetRehydratedAggregateAsync() : Cannot find property/field that manage state for aggregate" +
$" type {aggregateType.FullName}. State should be a property or a field of the aggregate");
}
state.ApplyRange(events);
return(state);
}
private async Task <AggregateState> GetRehydratedAggregateStateAsync(
object aggregateId,
Type aggregateType,
EventStoreDbContext externalCtx = null)
{
List <IDomainEvent> events = new List <IDomainEvent>();
#if NETSTANDARD2_0
events = await
GetAllEventsByAggregateId(aggregateType, aggregateId)
.ToList().ConfigureAwait(false);
#elif NETSTANDARD2_1
await foreach (var @event in GetAllEventsByAggregateId(aggregateType, aggregateId))
{
events.Add(@event);
}
#endif
if (externalCtx != null)
{
var eventsInChangeTracker = ExtractEventsFromChangeTracker(externalCtx).Select(GetRehydratedEventFromDbEvent);
events = events.Concat(eventsInChangeTracker).OrderBy(s => s.Sequence).ToList();
}
Snapshot snapshot = null;
using (var ctx = new EventStoreDbContext(_dbContextOptions, _archiveBehavior))
{
var hashedAggregateId = aggregateId.ToJson(true).GetHashCode();
snapshot = await ctx.Set <Snapshot>()
.Where(t => t.AggregateType == aggregateType.AssemblyQualifiedName && t.HashedAggregateId == hashedAggregateId)
.FirstOrDefaultAsync().ConfigureAwait(false);
}
PropertyInfo stateProp = aggregateType.GetAllProperties().FirstOrDefault(p => p.PropertyType.IsSubclassOf(typeof(AggregateState)));
FieldInfo stateField = aggregateType.GetAllFields().FirstOrDefault(f => f.FieldType.IsSubclassOf(typeof(AggregateState)));
Type stateType = stateProp?.PropertyType ?? stateField?.FieldType;
AggregateState state = null;
if (stateType != null)
{
if (snapshot != null)
{
state = snapshot.SnapshotData.FromJson(stateType) as AggregateState;
}
else
{
state = stateType.CreateInstance() as AggregateState;
}
}
else
{
throw new InvalidOperationException("EFEventStore.GetRehydratedAggregateAsync() : Cannot find property/field that manage state for aggregate" +
$" type {aggregateType.FullName}. State should be a property or a field of the aggregate");
}
state.ApplyRange(events);
return(state);
}