Dispatching Domain Events right before DbContext SaveChanges() so side effects from additional Domain Event Handlers are included within the same transaction

This commit is contained in:
Cesar De la Torre 2017-03-21 12:55:33 -07:00
parent a8733ac271
commit cb4da9864d

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@ -237,10 +237,18 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.Infrastructure
public async Task<int> SaveEntitiesAsync(CancellationToken cancellationToken = default(CancellationToken)) public async Task<int> SaveEntitiesAsync(CancellationToken cancellationToken = default(CancellationToken))
{ {
// Dispatch Domain Events collection.
// Choices:
// A) Right BEFORE committing data (EF SaveChanges) into the DB will make a single transaction including
// side effects from the domain event handlers which are using the same DbContext with "InstancePerLifetimeScope" or "scoped" lifetime
// B) Right AFTER committing data (EF SaveChanges) into the DB. will make multiple transactions.
// You will need to handle eventual consistency and compensatory actions in case of failures.
await _mediator.DispatchDomainEventsAsync(this);
// After executing this line all the changes performed thought the DbContext will be commited
var result = await base.SaveChangesAsync(); var result = await base.SaveChangesAsync();
// Dispatch the Domain Events collection right after saving/committing data into the database
await _mediator.DispatchDomainEventsAsync(this);
return result; return result;
} }
} }