private void CollateParticipants(Dictionary <ParticipantId, AccessCounter> participants, out List <ParticipantId> writers, out List <KeyValuePair <ParticipantId, AccessCounter> > resources, out KeyValuePair <ParticipantId, AccessCounter>?manager)
{
writers = null;
resources = null;
manager = null;
KeyValuePair <ParticipantId, AccessCounter>?priorityManager = null;
foreach (KeyValuePair <ParticipantId, AccessCounter> participant in participants)
{
ParticipantId id = participant.Key;
// priority manager
if (id.IsPriorityManager())
{
manager = priorityManager = (priorityManager == null)
? participant
: throw new ArgumentOutOfRangeException(nameof(participants), "Only one priority transaction manager allowed in transaction");
}
// resource
if (id.IsResource())
{
if (resources == null)
{
resources = new List <KeyValuePair <ParticipantId, AccessCounter> >();
}
resources.Add(participant);
if (participant.Value.Writes > 0)
{
if (writers == null)
{
writers = new List <ParticipantId>();
}
writers.Add(id);
}
}
// manager
if (manager == null && id.IsManager() && participant.Value.Writes > 0)
{
manager = participant;
}
}
}
