protected override void PerformWork(IList <ArraySegment <Message> > items, out int totalCount, out object state)
{
// The list of cursors represent (streamid, payloadid)
var nextCursors = new ulong[_stores.Count];
totalCount = 0;
for (var i = 0; i < _stores.Count; ++i)
{
// Get the mapping for this stream
ScaleoutMappingStore store = _stores[i];
// See if we have a cursor for this key
Cursor cursor = _cursors[i];
nextCursors[i] = cursor.Id;
// Try to find a local mapping for this payload
IEnumerator <ScaleoutMapping> enumerator = store.GetEnumerator(cursor.Id);
// Stop if we got more than max messages
while (totalCount < MaxMessages && enumerator.MoveNext())
{
ScaleoutMapping mapping = enumerator.Current;
// For each of the event keys we care about, extract all of the messages
// from the payload
lock (EventKeys)
{
for (var j = 0; j < EventKeys.Count; ++j)
{
string eventKey = EventKeys[j];
for (int k = 0; k < mapping.LocalKeyInfo.Count; k++)
{
LocalEventKeyInfo info = mapping.LocalKeyInfo[k];
if (info.Key.Equals(eventKey, StringComparison.OrdinalIgnoreCase))
{
MessageStoreResult <Message> storeResult = info.MessageStore.GetMessages(info.Id, 1);
if (storeResult.Messages.Count > 0)
{
items.Add(storeResult.Messages);
totalCount += storeResult.Messages.Count;
}
}
}
}
}
// Update the cursor id
nextCursors[i] = mapping.Id;
}
}
state = nextCursors;
}
private IEnumerable <Tuple <ScaleoutMapping, int> > GetMappings()
{
var enumerators = new List <CachedStreamEnumerator>();
var singleStream = _streams.Count == 1;
for (var streamIndex = 0; streamIndex < _streams.Count; ++streamIndex)
{
// Get the mapping for this stream
ScaleoutMappingStore store = _streams[streamIndex];
Cursor cursor = _cursors[streamIndex];
// Try to find a local mapping for this payload
var enumerator = new CachedStreamEnumerator(store.GetEnumerator(cursor.Id),
streamIndex);
enumerators.Add(enumerator);
}
var counter = 0;
while (enumerators.Count > 0)
{
ScaleoutMapping minMapping = null;
CachedStreamEnumerator minEnumerator = null;
for (int i = enumerators.Count - 1; i >= 0; i--)
{
counter += 1;
CachedStreamEnumerator enumerator = enumerators[i];
ScaleoutMapping mapping;
if (enumerator.TryMoveNext(out mapping))
{
if (minMapping == null || mapping.ServerCreationTime < minMapping.ServerCreationTime)
{
minMapping = mapping;
minEnumerator = enumerator;
}
}
else
{
enumerators.RemoveAt(i);
}
}
if (minMapping != null)
{
minEnumerator.ClearCachedValue();
yield return(Tuple.Create(minMapping, minEnumerator.StreamIndex));
}
}
_trace.TraceEvent(TraceEventType.Verbose, 0, $"End of mappings (connection ID: {Identity}). Total mappings processed: {counter}");
}
private IEnumerable <Tuple <ScaleoutMapping, int> > GetMappings()
{
var enumerators = new List <CachedStreamEnumerator>();
for (var streamIndex = 0; streamIndex < _streams.Count; ++streamIndex)
{
// Get the mapping for this stream
ScaleoutMappingStore store = _streams[streamIndex];
Cursor cursor = _cursors[streamIndex];
// Try to find a local mapping for this payload
var enumerator = new CachedStreamEnumerator(store.GetEnumerator(cursor.Id),
streamIndex);
enumerators.Add(enumerator);
}
while (enumerators.Count > 0)
{
ScaleoutMapping minMapping = null;
CachedStreamEnumerator minEnumerator = null;
for (int i = enumerators.Count - 1; i >= 0; i--)
{
CachedStreamEnumerator enumerator = enumerators[i];
ScaleoutMapping mapping;
if (enumerator.TryMoveNext(out mapping))
{
if (minMapping == null || mapping.ServerCreationTime < minMapping.ServerCreationTime)
{
minMapping = mapping;
minEnumerator = enumerator;
}
}
else
{
enumerators.RemoveAt(i);
}
}
if (minMapping != null)
{
minEnumerator.ClearCachedValue();
yield return(Tuple.Create(minMapping, minEnumerator.StreamIndex));
}
}
}
