public ICommandHandlingResult Commit(ICommandHandlerContext context, TAggregateRoot aggregateRoot)
{
Contract.Assume(context?.Command != null);
Contract.Assume(context.Metadata != null);
Contract.Assume(aggregateRoot?.State != null);
var command = context.Command;
// get state tracker from aggregate root state
var stateTracker = aggregateRoot.State.ExternalStateTracker as IEventProviderStateTracker;
Contract.Assume(stateTracker?.Revisions != null);
// make new transaction identity
TransactionIdentity transactionIdentity = CreateNewTransactionIdentity();
// create new transaction
var transaction = new EventProviderTransaction(transactionIdentity, stateTracker.EventProvider, command, aggregateRoot, stateTracker.Revisions, context.Metadata);
// store transaction
_eventStore.Commit(transaction);
// commit state tracker
stateTracker.Commit();
// return result
return(CreateCommandHandlingResult(command, aggregateRoot, transactionIdentity));
}
protected override void TransactionCommitted(EventProviderTransaction transaction)
{
// get domain events
var domainEvents = transaction.GetDomainEvents();
// get metadata
var metadata = new MetaCollection(transaction.Metadata);
// create contexts
var contexts = domainEvents.Select(x => new DomainEventHandlerContext(x, metadata))
.ToArray();
// public contexts
_dispatcher.Publish(contexts);
}
public async Task CommitAsync(EventProviderTransaction transaction)
{
try
{
await CommitTransactionAsync(transaction);
// raise transaction committed event for any listeners
TransactionCommitted(this, new TransactionCommittedEventArgs(transaction));
}
catch (AggregateRootConcurrencyException)
{
throw;
}
catch (Exception ex)
{
throw new EventStoreException(ErrorCommittingTransaction, ex);
}
}
public TransactionCommittedEventArgs(EventProviderTransaction transaction)
{
Contract.Requires(transaction != null);
_transaction = transaction;
}
protected abstract Task CommitTransactionAsync(EventProviderTransaction transaction);
protected abstract void CommitTransaction(EventProviderTransaction transaction);
protected abstract void TransactionCommitted(EventProviderTransaction transaction);
