public async Task Save <T>(T aggregate, long expectedVersion = -1, EventMetadata metadata = null) where T : AggregateRoot <TId>
{
await _store.ConnectWithContext(async (IEventStoreConnection connection, ActionContext context) =>
{
context.Logger.Information($"Writing changes for Aggregate {aggregate.GetType().Name} ({aggregate.Id}) to the event store.");
var changes = aggregate.GetUncommittedChanges();
context.Logger.Trace($"{changes.Count()} changes pending...");
var serializedChanges = changes.Select(e =>
{
var m = metadata != null
? EventMetadata.FromMetadataTemplate(metadata, expectedVersion)
: new EventMetadata(_sourceApp, version: expectedVersion);
var meta = JsonConvert.SerializeObject(m);
var body = JsonConvert.SerializeObject(e);
return(new
{
m.Id,
Type = e.GetType().Name,
Body = body,
Meta = meta
});
});
context.State.SetParam("changes", serializedChanges);
var data = serializedChanges.Select(change => new EventData(change.Id, change.Type, true, Encoding.ASCII.GetBytes(change.Body), Encoding.ASCII.GetBytes(change.Meta)));
var result = await connection.AppendToStreamAsync($"{aggregate.GetType().Name}-{aggregate.Id}", expectedVersion, data);
context.Logger.Debug("The changes were written to the event store successfully. Clearing the list.");
aggregate.MarkChangesAsCommitted();
}, "Save");
}
