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));
}
public EventStoreCommandHandlingResult(Guid commandId, AggregateRootIdentity aggregateRootIdentity, TransactionIdentity transactionIdentity)
: base(commandId, aggregateRootIdentity)
{
Contract.Requires(commandId != Guid.Empty);
Contract.Requires(aggregateRootIdentity != null);
Contract.Requires(transactionIdentity != null);
TransactionIdentity = transactionIdentity;
}
private TransactionIdentity CreateNewTransactionIdentity()
{
Contract.Ensures(Contract.Result <TransactionIdentity>() != null);
var transactionGuid = _guidGenerator.Create();
Contract.Assume(transactionGuid != Guid.Empty);
var transactionIdentity = new TransactionIdentity(transactionGuid);
return(transactionIdentity);
}
public EventProviderTransaction(TransactionIdentity identity, IEventProvider eventProvider, ICommand command, IAggregateRoot aggregateRoot, IReadOnlyCollection <EventStreamRevision> revisions, IReadOnlyCollection <Meta> metadata)
{
Contract.Requires(command != null);
Contract.Requires(aggregateRoot != null);
Contract.Requires(eventProvider != null);
Contract.Requires(revisions != null);
Contract.Requires(metadata != null);
Contract.Assume(identity != null);
_identity = identity;
_command = command;
_eventProvider = eventProvider;
_revisions = revisions;
_descriptor = new EventProviderDescriptor(aggregateRoot);
_metadata = metadata;
}
private static ICommandHandlingResult CreateCommandHandlingResult(ICommand command, TAggregateRoot aggregateRoot, TransactionIdentity transactionIdentity)
{
Contract.Requires(aggregateRoot != null);
Contract.Requires(command != null);
Contract.Requires(transactionIdentity != null);
Contract.Ensures(Contract.Result <ICommandHandlingResult>() != null);
var aggregateRootIdentity = aggregateRoot.Identity;
Contract.Assume(aggregateRootIdentity != null);
var commandId = command.CommandId;
Contract.Assume(commandId != Guid.Empty);
return(new EventStoreCommandHandlingResult(commandId, aggregateRootIdentity, transactionIdentity));
}