Package com.espertech.esper.common.internal.view.intersect

Class IntersectBatchView

java.lang.Object
com.espertech.esper.common.internal.view.core.ViewSupport
com.espertech.esper.common.internal.view.intersect.IntersectBatchView
All Implemented Interfaces:
AgentInstanceMgmtCallback, DataWindowView, IntersectViewMarker, RelatedView, View, Viewable, ViewDataVisitable, ViewDataVisitableContainer, LastPostObserver, Iterable<EventBean>
public class IntersectBatchView extends ViewSupport implements LastPostObserver, AgentInstanceMgmtCallback, DataWindowView, IntersectViewMarker, ViewDataVisitableContainer
A view that represents an intersection of multiple data windows.

The view is parameterized by two or more data windows. From an external viewpoint, the view retains all events that is in all of the data windows at the same time (an intersection) and removes all events that leave any of the data windows.

This special batch-version has the following logic: - only one batching view allowed as sub-view - all externally-received newData events are inserted into each view - all externally-received oldData events are removed from each view - any non-batch view has its newData output ignored - the single batch-view has its newData posted to child views, and removed from all non-batch views - all oldData events received from all non-batch views are removed from each view

  • Field Details

  • Constructor Details

  • Method Details

    • getViewContained

      public View[] getViewContained()

    • 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

    • 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.

    • newData

      public void newData(int streamId, EventBean[] newEvents, EventBean[] oldEvents)
      Description copied from interface: LastPostObserver
      Receive new and old events from a stream.
      Specified by:
      newData in interface LastPostObserver
      Parameters:
      streamId - - the stream number sending the events
      newEvents - - new events
      oldEvents - - old events

    • stop

      public void stop(AgentInstanceStopServices services)
      Specified by:
      stop in interface AgentInstanceMgmtCallback

    • visitViewContainer

      public void visitViewContainer(ViewDataVisitorContained viewDataVisitor)
      Specified by:
      visitViewContainer in interface ViewDataVisitableContainer

    • visitView

      public void visitView(ViewDataVisitor viewDataVisitor)
      Specified by:
      visitView in interface ViewDataVisitable

    • getViewFactory

      public ViewFactory getViewFactory()

    • getRelatedViews

      public View[] getRelatedViews()
      Specified by:
      getRelatedViews in interface RelatedView