internal ChannelQueue(Channel channel,
ushort id,
ChannelQueueOptions options,
IMessageDeliveryHandler deliveryHandler)
{
Channel = channel;
Id = id;
Options = options;
Status = options.Status;
DeliveryHandler = deliveryHandler;
State = QueueStateFactory.Create(this, options.Status);
TimeKeeper = new QueueTimeKeeper(this);
TimeKeeper.Run();
if (options.WaitForAcknowledge)
{
_ackSync = new SemaphoreSlim(1, 1);
}
_triggerTimer = new Timer(a =>
{
if (!_triggering && State.TriggerSupported)
{
_ = Trigger();
}
}, null, TimeSpan.FromSeconds(5000), TimeSpan.FromSeconds(5000));
}
/// <summary>
/// Initializes queue to first use
/// </summary>
internal void InitializeQueue(IMessageDeliveryHandler deliveryHandler = null)
{
if (IsInitialized)
{
return;
}
IsInitialized = true;
if (deliveryHandler != null)
{
DeliveryHandler = deliveryHandler;
}
if (DeliveryHandler == null)
{
throw new ArgumentNullException("Queue has no delivery handler: " + Name);
}
State = QueueStateFactory.Create(this, Options.Status);
TimeKeeper = new QueueTimeKeeper(this);
TimeKeeper.Run();
_ackSync = new SemaphoreSlim(1, 1);
_triggerTimer = new Timer(a =>
{
if (!_triggering && State.TriggerSupported)
{
_ = Trigger();
}
_ = CheckAutoDestroy();
}, null, TimeSpan.FromMilliseconds(5000), TimeSpan.FromMilliseconds(5000));
}
/// <summary>
/// Sets status of the queue
/// </summary>
public async Task SetStatus(QueueStatus status, IMessageDeliveryHandler newDeliveryHandler = null)
{
QueueStatus prevStatus = Status;
IQueueState prevState = State;
if (prevStatus == status)
{
return;
}
QueueStatusAction leave = await State.LeaveStatus(status);
if (leave == QueueStatusAction.Deny)
{
return;
}
if (leave == QueueStatusAction.DenyAndTrigger)
{
await Trigger();
return;
}
Status = status;
State = QueueStateFactory.Create(this, status);
QueueStatusAction enter = await State.EnterStatus(prevStatus);
if (enter == QueueStatusAction.Deny || enter == QueueStatusAction.DenyAndTrigger)
{
Status = prevStatus;
State = prevState;
await prevState.EnterStatus(prevStatus);
if (enter == QueueStatusAction.DenyAndTrigger)
{
await Trigger();
}
return;
}
if (Channel.EventHandler != null)
{
await Channel.EventHandler.OnQueueStatusChanged(this, prevStatus, status);
}
if (enter == QueueStatusAction.AllowAndTrigger)
{
_ = Trigger();
}
}
/// <summary>
/// Sets status of the queue
/// </summary>
public async Task SetStatus(QueueStatus status, IMessageDeliveryHandler newDeliveryHandler = null)
{
QueueStatus prevStatus = Status;
try
{
IQueueState prevState = State;
if (prevStatus == status)
{
return;
}
QueueStatusAction leave = await State.LeaveStatus(status);
if (leave == QueueStatusAction.Deny)
{
return;
}
if (leave == QueueStatusAction.DenyAndTrigger)
{
await Trigger();
return;
}
Status = status;
State = QueueStateFactory.Create(this, status);
QueueStatusAction enter = await State.EnterStatus(prevStatus);
if (enter == QueueStatusAction.Deny || enter == QueueStatusAction.DenyAndTrigger)
{
Status = prevStatus;
State = prevState;
await prevState.EnterStatus(prevStatus);
if (enter == QueueStatusAction.DenyAndTrigger)
{
await Trigger();
}
return;
}
if (newDeliveryHandler != null)
{
DeliveryHandler = newDeliveryHandler;
}
foreach (IQueueEventHandler handler in Server.QueueEventHandlers)
{
await handler.OnStatusChanged(this, prevStatus, status);
}
if (enter == QueueStatusAction.AllowAndTrigger)
{
_ = Trigger();
}
}
catch (Exception e)
{
Server.SendError("SET_QUEUE_STATUS", e, $"QueueName:{Name}, PrevStatus:{prevStatus} NextStatus:{status}");
}
}