//flush complete handlers
protected virtual void ForgetDispatchLocks(List <SignalWrapper <SignalDispatch <TKey> > > flushedItems)
{
var ids = flushedItems.Select(x => x.Signal.SignalDispatchId);
_dispatchLockTracker.ForgetLocks(ids);
ids = flushedItems
.Where(x => x.ConsolidatedSignals != null)
.SelectMany(x => x.ConsolidatedSignals)
.Select(x => x.Signal.SignalDispatchId);
_dispatchLockTracker.ForgetLocks(ids);
}
//methods
public bool Execute(SignalWrapper <SignalDispatch <TKey> > item)
{
bool isLockingEnabled = _settings.IsDbLockStorageEnabled;
if (!isLockingEnabled)
{
return(true);
}
if (item.Signal.ShouldBeConsolidated())
{
//consolidated items have their own locks for the whole consolidated group of dispatches
return(true);
}
bool isLockExpired = _lockTracker.CheckNeedToExtendLock(item.Signal.SignalDispatchId);
if (!isLockExpired)
{
return(true);
}
//Lock again before sending
DateTime lockExpirationDate = _lockTracker.GetMaxExpiredLockSinceUtc();
bool lockSet = _dispatchQueries.SetLock(new List <TKey> {
item.Signal.SignalDispatchId
},
lockId: _settings.LockedByInstanceId.Value,
newLockSinceTimeUtc: DateTime.UtcNow,
existingLockSinceDateUtc: lockExpirationDate)
.Result;
if (lockSet)
{
return(true);
}
//If already expired and locked by another Sender instance, do nothing and let another instance to process.
_lockTracker.ForgetLocks(new List <TKey> {
item.Signal.SignalDispatchId
});
//cancel any future steps
return(false);
}
