Package com.espertech.esper.common.internal.epl.namedwindow.core

Class NamedWindowTailViewInstance

java.lang.Object
com.espertech.esper.common.internal.view.core.ViewSupport
com.espertech.esper.common.internal.epl.namedwindow.core.NamedWindowTailViewInstance
All Implemented Interfaces:
View, Viewable, Iterable<EventBean>
public class NamedWindowTailViewInstance extends ViewSupport implements Iterable<EventBean>
This view is hooked into a named window's view chain as the last view and handles dispatching of named window insert and remove stream results via NamedWindowManagementService to consuming statements.

  • Constructor Details

  • Method Details

    • update

      public void update(EventBean[] newData, EventBean[] oldData)
      Description copied from interface: View
      Notify that data has been added or removed from the Viewable parent. The last object in the newData array of objects would be the newest object added to the parent view. The first object of the oldData array of objects would be the oldest object removed from the parent view.

      If the call to update contains new (inserted) data, then the first argument will be a non-empty list and the second will be empty. Similarly, if the call is a notification of deleted data, then the first argument will be empty and the second will be non-empty. Either the newData or oldData will be non-null. This method won't be called with both arguments being null, but either one could be null. The same is true for zero-length arrays. Either newData or oldData will be non-empty. If both are non-empty, then the update is a modification notification.

      When update() is called on a view by the parent object, the data in newData will be in the collection of the parent, and its data structures will be arranged to reflect that. The data in oldData will not be in the parent's data structures, and any access to the parent will indicate that that data is no longer there.

      Specified by:
      update in interface View
      Parameters:
      newData - is the new data that has been added to the parent view
      oldData - is the old data that has been removed from the parent view

    • addConsumer

      public NamedWindowConsumerView addConsumer(NamedWindowConsumerDesc consumerDesc, boolean isSubselect)

    • removeConsumer

      public void removeConsumer(NamedWindowConsumerView namedWindowConsumerView)
      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.
      Parameters:
      namedWindowConsumerView - is the consumer representative view

    • getEventType

      public EventType getEventType()
      Description copied from interface: Viewable
      Provides metadata information about the type of object the event collection contains.
      Specified by:
      getEventType in interface Viewable
      Returns:
      metadata for the objects in the collection

    • iterator

      public Iterator<EventBean> iterator()
      Description copied from interface: Viewable
      Allows iteration through all elements in this viewable. The iterator will return the elements in the collection in their natural order, or, if there is no natural ordering, in some unpredictable order.
      Specified by:
      iterator in interface Iterable<EventBean>
      Specified by:
      iterator in interface Viewable
      Returns:
      an iterator which will go through all current elements in the collection.

    • snapshot

      public Collection<EventBean> snapshot(QueryGraph queryGraph, Annotation[] annotations)

    • snapshotUpdate

      public EventBean[] snapshotUpdate(QueryGraph filterQueryGraph, ExprEvaluator optionalWhereClause, EventBeanUpdateHelperWCopy updateHelper, Annotation[] annotations)

    • snapshotDelete

      public EventBean[] snapshotDelete(QueryGraph filterQueryGraph, ExprEvaluator filterExpr, Annotation[] annotations)

    • snapshotNoLock

      public Collection<EventBean> snapshotNoLock(QueryGraph queryGraph, Annotation[] annotations)

    • snapshotNoLockWithFilter

      public Collection<EventBean> snapshotNoLockWithFilter(QueryGraph filterQueryGraph, Annotation[] annotations, ExprEvaluator filterExpr, ExprEvaluatorContext exprEvaluatorContext)

    • getAgentInstanceContext

      public AgentInstanceContext getAgentInstanceContext()

    • destroy

      public void destroy()
      Destroy the view.

    • getNumberOfEvents

      public long getNumberOfEvents()
      Returns the number of events held.
      Returns:
      number of events

    • getTailView

      public NamedWindowTailView getTailView()

    • stop

      public void stop()