private async Task FlushEvents(QueueTicket queueTicket)
{
IQueryable <StreamEvent> query = BuildStreamEventsQuery(queueTicket);
await PublishStreamEvents(query, partitionKey : $"{queueTicket.StreamId}").ConfigureAwait(continueOnCapturedContext: false);
await DeleteQueueTicket(queueTicket).ConfigureAwait(continueOnCapturedContext: false);
}
public static IQueryable <StreamEvent> BuildStreamEventsQuery(
this CloudTable table, QueueTicket queueTicket)
{
return(from e in table.CreateQuery <StreamEvent>()
where e.PartitionKey == $"{queueTicket.StateType}:{queueTicket.StreamId}"
where e.RowKey.CompareTo($"{queueTicket.StartVersion:D19}") >= 0
where e.RowKey.CompareTo($"{queueTicket.StartVersion + queueTicket.EventCount:D19}") < 0
where e.Transaction == queueTicket.Transaction
select e);
}
private async Task SaveAndPublish(string stateType,
Guid transaction,
Guid streamId,
long startVersion,
IReadOnlyList <object> events,
TracingProperties tracingProperties)
{
if (events.Count == 0)
{
return;
}
await SaveQueueTicket().ConfigureAwait(continueOnCapturedContext: false);
await SaveEvents().ConfigureAwait(continueOnCapturedContext: false);
await PublishPendingEvents().ConfigureAwait(continueOnCapturedContext: false);
Task SaveQueueTicket()
{
var queueTicket = new QueueTicket(stateType, streamId, startVersion, events.Count, transaction);
return(_table.ExecuteAsync(TableOperation.Insert(queueTicket)));
}
Task SaveEvents()
{
var batch = new TableBatchOperation();
for (int i = 0; i < events.Count; i++)
{
object source = events[i];
var streamEvent = new StreamEvent(
stateType,
streamId,
version: startVersion + i,
raisedTimeUtc: DateTime.UtcNow,
eventType: _typeResolver.ResolveTypeName(source.GetType()),
payload: _jsonProcessor.ToJson(source),
messageId: $"{Guid.NewGuid()}",
tracingProperties.OperationId,
tracingProperties.Contributor,
tracingProperties.ParentId,
transaction);
batch.Insert(streamEvent);
}
return(_table.ExecuteBatchAsync(batch));
}
Task PublishPendingEvents() => _publisher.PublishEvents(stateType, streamId);
}
private Task DeleteQueueTicket(QueueTicket queueTicket)
{
return(_table.ExecuteAsync(TableOperation.Delete(queueTicket)));
}
private IQueryable <StreamEvent> BuildStreamEventsQuery(QueueTicket queueTicket)
{
return(_table.BuildStreamEventsQuery(queueTicket));
}
