internal void BeginStatePartitionLoad(
ProjectionMessage.Projections.CommittedEventReceived @event, Action loadCompleted)
{
string statePartition = _checkpointStrategy.StatePartitionSelector.GetStatePartition(@event);
if (statePartition == "") // root is always cached
{
loadCompleted();
return;
}
string state = _partitionStateCache.TryGetAndLockPartitionState(statePartition, @event.CheckpointTag);
if (state != null)
{
loadCompleted();
}
else
{
string partitionStateStreamName = MakePartitionStateStreamName(statePartition);
_readRequestsInProgress++;
_readDispatcher.Publish(
new ClientMessage.ReadStreamEventsBackward(
Guid.NewGuid(), _readDispatcher.Envelope, partitionStateStreamName, -1, 1, resolveLinks: false),
m => OnLoadStatePartitionCompleted(statePartition, @event, m, loadCompleted));
}
}
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));
}
public void BeginGetPartitionStateAt(
string statePartition, CheckpointTag at, Action <PartitionState> loadCompleted, bool lockLoaded)
{
if (statePartition == "") // root is always cached
{
// root partition is always locked
var state = _partitionStateCache.TryGetAndLockPartitionState(statePartition, null);
loadCompleted(state);
}
else
{
var s = lockLoaded
? _partitionStateCache.TryGetAndLockPartitionState(statePartition, at)
: _partitionStateCache.TryGetPartitionState(statePartition);
if (s != null)
{
loadCompleted(s);
}
else
{
Action <PartitionState> completed = state =>
{
if (lockLoaded)
{
_partitionStateCache.CacheAndLockPartitionState(statePartition, state, at);
}
else
{
_partitionStateCache.CachePartitionState(statePartition, state);
}
loadCompleted(state);
};
if (_projectionConfig.CheckpointsEnabled)
{
_checkpointManager.BeginLoadPartitionStateAt(statePartition, at, completed);
}
else
{
var state = new PartitionState("", null, _zeroCheckpointTag);
completed(state);
}
}
}
}
internal void BeginStatePartitionLoad(string statePartition, CheckpointTag eventCheckpointTag, Action loadCompleted)
{
if (statePartition == "") // root is always cached
{
loadCompleted();
return;
}
var state = _partitionStateCache.TryGetAndLockPartitionState(statePartition, eventCheckpointTag);
if (state != null)
{
loadCompleted();
}
else
{
string partitionStateStreamName = MakePartitionStateStreamName(statePartition);
_readRequestsInProgress++;
var requestId = _readDispatcher.Publish(new ClientMessage.ReadStreamEventsBackward(Guid.NewGuid(), _readDispatcher.Envelope, partitionStateStreamName, -1, 1, resolveLinks: false), m => OnLoadStatePartitionCompleted(statePartition, m, loadCompleted, eventCheckpointTag));
if (requestId != Guid.Empty)
{
_loadStateRequests.Add(requestId);
}
}
}