I try to use access to prev state of an enity before save on db. I use UpdatingEvent via EventBus, but on event the state of item is already changed. I try to re read from DB via UnitOfWork Manger but i get the same value. How can access to the prev state?
using (var uow = _unitOfWorkManager.Begin(new UnitOfWorkOptions
{
Scope = TransactionScopeOption.RequiresNew,
IsTransactional = true,
IsolationLevel = IsolationLevel.ReadUncommitted
}))
{
if (outerUow != null)
{
_unitOfWorkManager.Current.SetTenantId(outerUow.GetTenantId());
}
oldEntity = _entityRepository
.GetAll()
.AddEntityFilterId(eventData.Entity).FirstOrDefault();
uow.Complete();
}
// if change RequiresNew to Suppress I get a timeout from Database
6 Answer(s)
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Can you share more code?
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this is the full class
public abstract class WorkFlowBase<TEntity,TEntityKey> : IDomainService, IWorkFlow, IEventHandler<EntityCreatingEventData<TEntity>>, IEventHandler<EntityUpdatingEventData<TEntity>>, IEventHandler<EntityDeletingEventData<TEntity>> where TEntity : class, IEntity<TEntityKey>, new() { private readonly IWorkFlowManager _workFlowManager; private readonly IUnitOfWorkManager _unitOfWorkManager; private readonly IRepository<TEntity, TEntityKey> _entityRepository; public ILogger Log { get; set; } protected WorkFlowBase(IWorkFlowManager workFlowManager, IUnitOfWorkManager unitOfWorkManager, IRepository<TEntity, TEntityKey> entityRepository) { _workFlowManager = workFlowManager; _unitOfWorkManager = unitOfWorkManager; _entityRepository = entityRepository; Log = NullLogger.Instance; } public void HandleEvent(EntityCreatingEventData<TEntity> eventData) { CallWorkFlow(eventData, EventOperation.Creating); } private void CallWorkFlow(EntityChangingEventData<TEntity> eventData, EventOperation operation) { var type = typeof(TEntity); // Gat snapshot of data var oldEntity = new TEntity(); var outerUow = _unitOfWorkManager.Current; using (var uow = _unitOfWorkManager.Begin(new UnitOfWorkOptions { Scope = TransactionScopeOption.RequiresNew, IsTransactional = true, IsolationLevel = IsolationLevel.ReadUncommitted })) { if (outerUow != null) { _unitOfWorkManager.Current.SetTenantId(outerUow.GetTenantId()); } oldEntity = _entityRepository .GetAll() .AddEntityFilterId(eventData.Entity).FirstOrDefault(); uow.Complete(); } } public void HandleEvent(EntityDeletingEventData<TEntity> eventData) { CallWorkFlow(eventData, EventOperation.Deleting); } public void HandleEvent(EntityUpdatingEventData<TEntity> eventData) { CallWorkFlow(eventData, EventOperation.Deleting); } } public enum EventOperation { Creating, Updating, Deleting } -
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Update I think EventBus Event Updateing is too late to implements my need. I think the only way is override SaveChanges
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Why do you set the transaction isolation level to
IsolationLevel.ReadUncommitted. -
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Because I need to get data on Prev state. The Goal is to get data for entity before save and new value beacuse I need to compare one value and decide if is changed I need to do an operation.
EventBus Changeing is too late for that goal beacuse happen after saveChanges and the data is alredy into the database.
So now I try to override the saveChanges method to achive my goal
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