/// <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>
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.IsEmpty()) {
// 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));
}
}
consumersNonContext; // handles as copy-on-write
public NamedWindowTailViewImpl(
EventType eventType,
bool isParentBatchWindow,
EPStatementInitServices services)
: base(eventType, isParentBatchWindow, services)
{
this.consumersNonContext = NamedWindowUtil.CreateConsumerMap(isPrioritized);
}
public NamedWindowTailViewInstance(
NamedWindowRootViewInstance rootViewInstance,
NamedWindowTailView tailView,
NamedWindow namedWindow,
AgentInstanceContext agentInstanceContext)
{
_rootViewInstance = rootViewInstance;
_tailView = tailView;
_namedWindow = namedWindow;
_agentInstanceContext = agentInstanceContext;
_consumersInContext = NamedWindowUtil.CreateConsumerMap(tailView.IsPrioritized);
_latchFactory = tailView.MakeLatchFactory();
}
public override NamedWindowConsumerView AddConsumerNoContext(NamedWindowConsumerDesc consumerDesc)
{
NamedWindowConsumerCallback consumerCallback = new ProxyNamedWindowConsumerCallback() {
ProcGetEnumerator = () => throw new UnsupportedOperationException(
"Iterator not supported on named windows that have a context attached and when that context is not the same as the consuming statement's context"),
ProcIsParentBatchWindow = () => isParentBatchWindow,
ProcSnapshot = (
queryGraph,
annotations) => Collections.GetEmptyList<EventBean>(),
ProcStopped = RemoveConsumerNoContext,
};
// Construct consumer view, allow a callback to this view to remove the consumer
bool audit = AuditEnum.STREAM.GetAudit(consumerDesc.AgentInstanceContext.StatementContext.Annotations) !=
null;
NamedWindowConsumerView consumerView = new NamedWindowConsumerView(
consumerDesc.NamedWindowConsumerId,
consumerDesc.FilterEvaluator,
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 runtime lock
IDictionary<EPStatementAgentInstanceHandle, IList<NamedWindowConsumerView>> newConsumers =
NamedWindowUtil.CreateConsumerMap(isPrioritized);
newConsumers.PutAll(consumersNonContext);
newConsumers.Put(consumerDesc.AgentInstanceContext.EpStatementAgentInstanceHandle, viewsPerStatements);
consumersNonContext = newConsumers;
}
viewsPerStatements.Add(consumerView);
return consumerView;
}
public override void RemoveConsumerNoContext(NamedWindowConsumerView namedWindowConsumerView)
{
EPStatementAgentInstanceHandle handleRemoved = null;
// Find the consumer view
foreach (KeyValuePair<EPStatementAgentInstanceHandle, IList<NamedWindowConsumerView>> entry in
consumersNonContext) {
bool 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) {
IDictionary<EPStatementAgentInstanceHandle, IList<NamedWindowConsumerView>> newConsumers =
NamedWindowUtil.CreateConsumerMap(isPrioritized);
newConsumers.PutAll(consumersNonContext);
newConsumers.Remove(handleRemoved);
consumersNonContext = newConsumers;
}
}
public void Destroy()
{
_consumersInContext = NamedWindowUtil.CreateConsumerMap(TailView.IsPrioritized);
}
public NamedWindowConsumerView AddConsumer(
NamedWindowConsumerDesc consumerDesc,
bool isSubselect)
{
NamedWindowConsumerCallback consumerCallback = new ProxyNamedWindowConsumerCallback {
ProcGetEnumerator = () => {
var instance = _namedWindow.GetNamedWindowInstance(AgentInstanceContext);
if (instance == null) {
// this can happen on context-partition "output when terminated"
return GetEnumerator();
}
return instance.TailViewInstance.GetEnumerator();
},
ProcStopped = namedWindowConsumerView
=> RemoveConsumer(namedWindowConsumerView),
ProcIsParentBatchWindow = ()
=> _rootViewInstance.IsParentBatchWindow,
ProcSnapshot = (
queryGraph,
annotations)
=> Snapshot(queryGraph, annotations)
};
// 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(
consumerDesc.NamedWindowConsumerId,
consumerDesc.FilterEvaluator,
consumerDesc.OptPropertyEvaluator,
TailView.EventType,
consumerCallback,
consumerDesc.AgentInstanceContext,
audit);
// indicate to virtual data window that a consumer was added
var virtualDWView = _rootViewInstance.VirtualDataWindow;
virtualDWView?.VirtualDataWindow.HandleEvent(
new VirtualDataWindowEventConsumerAdd(
TailView.EventType.Name,
consumerView,
consumerDesc.AgentInstanceContext.StatementName,
consumerDesc.AgentInstanceContext.AgentInstanceId,
consumerDesc.FilterEvaluator,
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 runtime 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;
}