com.espertech.esper.epl.view
Class OutputProcessViewBaseCallback

java.lang.Object
  com.espertech.esper.epl.view.OutputProcessViewBase
      com.espertech.esper.epl.view.OutputProcessViewBaseCallback

All Implemented Interfaces:

JoinSetIndicator, JoinSetProcessor, OutputProcessViewTerminable, EventCollection, View, Viewable, java.lang.Iterable<EventBean>

public class OutputProcessViewBaseCallback
extends OutputProcessViewBase

Factory for output processing views.

Field Summary

Fields inherited from class com.espertech.esper.epl.view.OutputProcessViewBase

childView, joinExecutionStrategy, parentView, resultSetProcessor

Constructor Summary

OutputProcessViewBaseCallback(ResultSetProcessor resultSetProcessor, OutputProcessViewCallback callback)

Method Summary

java.util.Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
void	process(java.util.Set<MultiKey<EventBean>> newEvents, java.util.Set<MultiKey<EventBean>> oldEvents, ExprEvaluatorContext exprEvaluatorContext) Process join result set.
void	terminated()
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.

Methods inherited from class com.espertech.esper.epl.view.OutputProcessViewBase

addView, getEventType, getParent, getViews, hasViews, removeAllViews, removeView, setJoinExecutionStrategy, setParent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OutputProcessViewBaseCallback

public OutputProcessViewBaseCallback(ResultSetProcessor resultSetProcessor,
                                     OutputProcessViewCallback callback)

Method Detail

iterator

public java.util.Iterator<EventBean> iterator()

Description copied from interface: EventCollection

Allows iteration through all elements in this event collection. 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.

process

public void process(java.util.Set<MultiKey<EventBean>> newEvents,
                    java.util.Set<MultiKey<EventBean>> oldEvents,
                    ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: JoinSetProcessor

Process join result set.

Parameters:

newEvents - - set of event tuples representing new data

oldEvents - - set of event tuples representing old data

exprEvaluatorContext - expression evaluation context

terminated

public void terminated()

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