public void given()
{
//given
_cache = new PartitionStateCache();
_cachedAtCheckpointTag = CheckpointTag.FromPosition(1000, 900);
_cache.CacheAndLockPartitionState("partition", new PartitionStateCache.State("data", _cachedAtCheckpointTag), _cachedAtCheckpointTag);
_relockedData = _cache.TryGetAndLockPartitionState("partition", CheckpointTag.FromPosition(2000, 1900));
}
private void OnLoadPartitionStateReadStreamEventsBackwardCompleted(
ClientMessage.ReadStreamEventsBackwardCompleted message, CheckpointTag requestedStateCheckpointTag,
Action<PartitionStateCache.State> loadCompleted, string partitionStreamName, string stateEventType)
{
//NOTE: the following remove may do nothing in tests as completed is raised before we return from publish.
_loadStateRequests.Remove(message.CorrelationId);
_readRequestsInProgress--;
if (message.Events.Length == 1)
{
EventRecord @event = message.Events[0].Event;
if (@event.EventType == stateEventType)
{
var loadedStateCheckpointTag = @event.Metadata.ParseJson<CheckpointTag>();
// always recovery mode? skip until state before current event
//TODO: skip event processing in case we know i has been already processed
if (loadedStateCheckpointTag < requestedStateCheckpointTag)
{
var state = new PartitionStateCache.State(Encoding.UTF8.GetString(@event.Data), loadedStateCheckpointTag);
loadCompleted(state);
return;
}
}
}
if (message.NextEventNumber == -1)
{
var state = new PartitionStateCache.State("", _positionTagger.MakeZeroCheckpointTag());
loadCompleted(state);
return;
}
_readRequestsInProgress++;
var requestId =
_readDispatcher.Publish(
new ClientMessage.ReadStreamEventsBackward(
Guid.NewGuid(), _readDispatcher.Envelope, partitionStreamName, message.NextEventNumber, 1,
resolveLinks: false, validationStreamVersion: null),
m =>
OnLoadPartitionStateReadStreamEventsBackwardCompleted(m, requestedStateCheckpointTag, loadCompleted, partitionStreamName, stateEventType));
if (requestId != Guid.Empty)
_loadStateRequests.Add(requestId);
}
