Package com.espertech.esper.common.internal.context.util

Class InternalRoutePreprocessView

java.lang.Object
com.espertech.esper.common.internal.view.core.ViewSupport
com.espertech.esper.common.internal.context.util.InternalRoutePreprocessView
All Implemented Interfaces:
View, Viewable, Iterable<EventBean>
public class InternalRoutePreprocessView extends ViewSupport
View for use with pre-processing statement such as "update istream" for indicating previous and current event.

  • Constructor Details

    • InternalRoutePreprocessView

      public InternalRoutePreprocessView(EventType eventType, StatementResultService statementResultService)
      Ctor.
      Parameters:
      eventType - the type of event to indicator
      statementResultService - determines whether listeners or subscribers are attached.

  • 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.

      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.
      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.
      Returns:
      an iterator which will go through all current elements in the collection.

    • isIndicate

      public boolean isIndicate()
      Returns true if a subscriber or listener is attached.
      Returns:
      indicator

    • indicate

      public void indicate(EventBean newEvent, EventBean oldEvent)
      Indicate an modifed event and its previous version.
      Parameters:
      newEvent - modified event
      oldEvent - previous version event

    • getStatementResultService

      public StatementResultService getStatementResultService()