/// <summary>
/// Called by the consumer view to indicate it was stopped or destroyed, such that the
/// consumer can be deregistered and further dispatches disregard this consumer.
/// </summary>
/// <param name="namedWindowConsumerView">is the consumer representative view</param>
public void RemoveConsumer(NamedWindowConsumerView namedWindowConsumerView)
{
EPStatementAgentInstanceHandle handleRemoved = null;
// Find the consumer view
foreach (var entry in _consumersInContext)
{
var foundAndRemoved = entry.Value.Remove(namedWindowConsumerView);
// Remove the consumer view
if ((foundAndRemoved) && (entry.Value.Count == 0))
{
// Remove the handle if this list is now empty
handleRemoved = entry.Key;
break;
}
}
if (handleRemoved != null)
{
var newConsumers = NamedWindowUtil.CreateConsumerMap(_tailView.IsPrioritized);
newConsumers.PutAll(_consumersInContext);
newConsumers.Remove(handleRemoved);
_consumersInContext = newConsumers;
}
// indicate to virtual data window that a consumer was added
var virtualDWView = _rootViewInstance.VirtualDataWindow;
if (virtualDWView != null && handleRemoved != null)
{
virtualDWView.VirtualDataWindow.HandleEvent(new VirtualDataWindowEventConsumerRemove(_tailView.EventType.Name, namedWindowConsumerView, handleRemoved.StatementHandle.StatementName, handleRemoved.AgentInstanceId));
}
}
/// <summary>
/// Adds a consuming (selecting) statement to the named window.
/// </summary>
/// <param name="consumerDesc">The consumer desc.</param>
/// <param name="isSubselect">if set to <c>true</c> [is subselect].</param>
/// <returns>
/// consumer view
/// </returns>
public NamedWindowConsumerView AddConsumer(NamedWindowConsumerDesc consumerDesc, bool isSubselect)
{
NamedWindowConsumerCallback consumerCallback = new ProxyNamedWindowConsumerCallback()
{
ProcGetEnumerator = GetEnumerator,
ProcStopped = RemoveConsumer,
};
// Construct consumer view, allow a callback to this view to remove the consumer
var audit = AuditEnum.STREAM.GetAudit(consumerDesc.AgentInstanceContext.StatementContext.Annotations) != null;
var consumerView = new NamedWindowConsumerView(
ExprNodeUtility.GetEvaluators(consumerDesc.FilterList),
consumerDesc.OptPropertyEvaluator,
_tailView.EventType,
consumerCallback,
consumerDesc.AgentInstanceContext,
audit);
// indicate to virtual data window that a consumer was added
var virtualDWView = _rootViewInstance.VirtualDataWindow;
if (virtualDWView != null)
{
virtualDWView.VirtualDataWindow.HandleEvent(
new VirtualDataWindowEventConsumerAdd(
_tailView.EventType.Name,
consumerView,
consumerDesc.AgentInstanceContext.StatementName,
consumerDesc.AgentInstanceContext.AgentInstanceId,
ExprNodeUtility.ToArray(consumerDesc.FilterList),
_agentInstanceContext));
}
// Keep a list of consumer views per statement to accommodate joins and subqueries
var viewsPerStatements = _consumersInContext.Get(consumerDesc.AgentInstanceContext.EpStatementAgentInstanceHandle);
if (viewsPerStatements == null)
{
viewsPerStatements = new CopyOnWriteList <NamedWindowConsumerView>();
// avoid concurrent modification as a thread may currently iterate over consumers as its dispatching
// without the engine lock
var newConsumers = NamedWindowUtil.CreateConsumerMap(_tailView.IsPrioritized);
newConsumers.PutAll(_consumersInContext);
newConsumers.Put(consumerDesc.AgentInstanceContext.EpStatementAgentInstanceHandle, viewsPerStatements);
_consumersInContext = newConsumers;
}
if (isSubselect)
{
viewsPerStatements.Insert(0, consumerView);
}
else
{
viewsPerStatements.Add(consumerView);
}
return(consumerView);
}
public NamedWindowConsumerView AddConsumer(NamedWindowConsumerDesc consumerDesc)
{
NamedWindowConsumerCallback consumerCallback = new ProxyNamedWindowConsumerCallback(
() =>
{
throw new UnsupportedOperationException(
"GetEnumerator not supported on named windows that have a context attached and when that context is not the same as the consuming statement's context");
},
RemoveConsumer);
// Construct consumer view, allow a callback to this view to remove the consumer
var audit = AuditEnum.STREAM.GetAudit(consumerDesc.AgentInstanceContext.StatementContext.Annotations) != null;
var consumerView = new NamedWindowConsumerView(
ExprNodeUtility.GetEvaluators(consumerDesc.FilterList),
consumerDesc.OptPropertyEvaluator,
_eventType,
consumerCallback,
consumerDesc.AgentInstanceContext,
audit);
// Keep a list of consumer views per statement to accomodate joins and subqueries
IList <NamedWindowConsumerView> viewsPerStatements = _consumersNonContext.Get(consumerDesc.AgentInstanceContext.EpStatementAgentInstanceHandle);
if (viewsPerStatements == null)
{
viewsPerStatements = new CopyOnWriteList <NamedWindowConsumerView>();
// avoid concurrent modification as a thread may currently iterate over consumers as its dispatching
// without the engine lock
var newConsumers = NamedWindowUtil.CreateConsumerMap(_isPrioritized);
newConsumers.PutAll(_consumersNonContext);
newConsumers.Put(consumerDesc.AgentInstanceContext.EpStatementAgentInstanceHandle, viewsPerStatements);
_consumersNonContext = newConsumers;
}
viewsPerStatements.Add(consumerView);
return(consumerView);
}
/// <summary>Called by the consumer view to indicate it was stopped or destroyed, such that the consumer can be deregistered and further dispatches disregard this consumer. </summary>
/// <param name="namedWindowConsumerView">is the consumer representative view</param>
public void RemoveConsumer(NamedWindowConsumerView namedWindowConsumerView)
{
EPStatementAgentInstanceHandle handleRemoved = null;
// Find the consumer view
foreach (var entry in _consumersNonContext)
{
var foundAndRemoved = entry.Value.Remove(namedWindowConsumerView);
// Remove the consumer view
if ((foundAndRemoved) && (entry.Value.Count == 0))
{
// Remove the handle if this list is now empty
handleRemoved = entry.Key;
break;
}
}
if (handleRemoved != null)
{
var newConsumers = NamedWindowUtil.CreateConsumerMap(IsPrioritized);
newConsumers.PutAll(_consumersNonContext);
newConsumers.Remove(handleRemoved);
_consumersNonContext = newConsumers;
}
}
/// <summary>
/// Stoppeds the specified named window consumer view.
/// </summary>
/// <param name="namedWindowConsumerView">The named window consumer view.</param>
public void Stopped(NamedWindowConsumerView namedWindowConsumerView)
{
ProcStopped.Invoke(namedWindowConsumerView);
}
