private bool TryCaptureInternal(
SynchronizationServiceConfiguration synchronizationService,
string ownerId,
out SynchronizationToken token)
{
var synchronizationObject = _synchronizationObjectRepository.GetLastCreated();
// If the synchronization object isn't captured
if (!synchronizationObject.ServiceId.HasValue)
{
synchronizationObject = _synchronizationObjectRepository.Capture(synchronizationObject.Id, ownerId, synchronizationService.Id);
_synchronizationObjectRepository.SaveChanges();
// Exception throwing means that synchronization object was updated (captured) by another service execution
token = SynchronizationToken.Create(synchronizationObject, ownerId);
return(true);
}
if (synchronizationObject.ServiceId == synchronizationService.Id)
{
if (synchronizationService.MaxConcurrencyLevel.HasValue &&
synchronizationObject.OwnerCount == synchronizationService.MaxConcurrencyLevel)
{
token = SynchronizationToken.Empty;
return(false);
}
if (synchronizationObject.Owners.Any(oo => oo.OwnerId == ownerId && oo.IsActive))
{
token = SynchronizationToken.Empty;
return(false);
}
synchronizationObject = _synchronizationObjectRepository.Capture(synchronizationObject.Id, ownerId);
_synchronizationObjectRepository.SaveChanges();
// Exception throwing means that synchronization object was updated by another run execution, there are only 3 cases:
// 1. Another new incoming run incremented Count of Owners (Captured this object) of this sync object
// 2. Some owner of this sync object decremented Count of Owners
// 3. Some owner of this sync object decremented Count of Owners and in case if CountOfOwners == 0 released this object and added new entry to the database
token = SynchronizationToken.Create(synchronizationObject, ownerId);
return(true);
}
// If synchronization object is captured by another service
token = SynchronizationToken.Empty;
return(false);
}
public void AddService(int id, int?maxConcurrencyLevel = null)
{
var configuration = new SynchronizationServiceConfiguration(id, maxConcurrencyLevel);
_configuration.Add(configuration);
}
public bool TryGet(int id, out SynchronizationServiceConfiguration service)
{
return(_services.TryGetValue(id, out service));
}
public SynchronizationServicesConfiguration Add(SynchronizationServiceConfiguration service)
{
_services.Add(service.Id, service);
return(this);
}
