public IEnumerable <object> Read(params Type[] eventTypes)
{
var typeReaders = CreateTypeReaders(eventTypes.ToDictionary(t => t, t => (Action <object>)(_ => { })));
var relevantTypeReaders = new ReaderProgressSinglyLinkedList(typeReaders);
var nextReader = relevantTypeReaders.First;
var subsequentReader = nextReader.Next;
while (true)
{
// Use first reader, unless a subsequent reader in priority queue has an older message.
if (subsequentReader != null && nextReader.NextSequenceId > subsequentReader.NextSequenceId)
{
// Scan until we can find new insert point
relevantTypeReaders.RemoveFirst();
var node = subsequentReader;
while (true)
{
if (node.Next == null)
{
relevantTypeReaders.AddAfter(node, nextReader);
break;
}
if (nextReader.NextSequenceId < node.Next.NextSequenceId)
{
relevantTypeReaders.AddAfter(node, nextReader);
break;
}
node = node.Next;
}
// Get next
nextReader = relevantTypeReaders.First;
subsequentReader = nextReader.Next;
}
var instance = nextReader.Reader.ReadPooled();
yield return(instance);
var nextSeqId = nextReader.Reader.ReadNextSequenceId();
if (nextSeqId == null)
{
relevantTypeReaders.RemoveFirst();
if (relevantTypeReaders.First == null)
{
break;
}
nextReader = relevantTypeReaders.First;
subsequentReader = nextReader.Next;
}
else
{
nextReader.NextSequenceId = nextSeqId.Value;
}
}
foreach (var type in typeReaders)
{
type?.Dispose();
}
}
public void Invoke(Dictionary <Type, Action <object> > handlers)
{
var typeReaders = CreateTypeReaders(handlers);
var relevantTypeReaders = new ReaderProgressSinglyLinkedList(typeReaders);
var nextReader = relevantTypeReaders.First;
var subsequentReader = nextReader.Next;
while (true)
{
// Use first reader, unless a subsequent reader in priority queue has an older message.
if (subsequentReader != null && nextReader.NextSequenceId > subsequentReader.NextSequenceId)
{
// Scan until we can find new insert point
relevantTypeReaders.RemoveFirst();
var node = subsequentReader;
while (true)
{
if (node.Next == null)
{
relevantTypeReaders.AddAfter(node, nextReader);
break;
}
if (nextReader.NextSequenceId < node.Next.NextSequenceId)
{
relevantTypeReaders.AddAfter(node, nextReader);
break;
}
node = node.Next;
}
// Get next
nextReader = relevantTypeReaders.First;
subsequentReader = nextReader.Next;
}
var handler = nextReader.Reader.Handler;
var instance = nextReader.Reader.ReadPooled();
handler(instance);
var nextSeqId = nextReader.Reader.ReadNextSequenceId();
if (nextSeqId == null)
{
relevantTypeReaders.RemoveFirst();
if (relevantTypeReaders.First == null)
{
break;
}
nextReader = relevantTypeReaders.First;
subsequentReader = nextReader.Next;
}
else
{
nextReader.NextSequenceId = nextSeqId.Value;
}
}
foreach (var type in typeReaders)
{
type?.Dispose();
}
}
