com.espertech.esper.view.internal

Class IntersectBatchView

java.lang.Object

com.espertech.esper.view.ViewSupport

com.espertech.esper.view.internal.IntersectBatchView

All Implemented Interfaces:

StopCallback, CloneableView, DataWindowView, EventCollection, GroupableView, IntersectViewMarker, LastPostObserver, ViewContainer, StoppableView, View, Viewable, ViewDataVisitable, ViewDataVisitableContainer, Iterable<EventBean>

public class IntersectBatchView
extends ViewSupport
implements LastPostObserver, CloneableView, StoppableView, DataWindowView, IntersectViewMarker, ViewDataVisitableContainer, ViewContainer

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 Summary

Fields

Modifier and Type	Field and Description
protected AgentInstanceViewFactoryChainContext	agentInstanceViewFactoryContext
protected IntersectViewFactory	factory
protected View[]	views

Fields inherited from class com.espertech.esper.view.ViewSupport

EMPTY_VIEW_ARRAY, parent

Constructor Summary

Constructors

Constructor and Description
IntersectBatchView(AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext, IntersectViewFactory factory, List<View> viewList)

Method Summary

Modifier and Type	Method and Description
View	cloneView() Duplicates the view.
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
View[]	getViewContained()
ViewFactory	getViewFactory()
Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
void	newData(int streamId, EventBean[] newEvents, EventBean[] oldEvents) Receive new and old events from a stream.
void	stop() Stops the underlying resources.
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.
void	visitView(ViewDataVisitor viewDataVisitor)
void	visitViewContainer(ViewDataVisitorContained viewDataVisitor)

Methods inherited from class com.espertech.esper.view.ViewSupport

addView, addView, dumpChildViews, dumpUpdateParams, dumpUpdateParams, findDescendent, findViewIndex, getParent, getViews, hasViews, removeAllViews, removeView, removeView, setParent, updateChildren, updateChildren

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.view.View

getParent, setParent

Methods inherited from interface com.espertech.esper.view.Viewable

addView, getViews, hasViews, removeAllViews, removeView

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

agentInstanceViewFactoryContext

protected final AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext

factory

protected final IntersectViewFactory factory

views

protected final View[] views

Constructor Detail

IntersectBatchView

public IntersectBatchView(AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext,
                          IntersectViewFactory factory,
                          List<View> viewList)

Method Detail

getViewContained

public View[] getViewContained()

Specified by:

getViewContained in interface ViewContainer

cloneView

public View cloneView()

Description copied from interface: CloneableView

Duplicates the view.

Expected to return a same view in initialized state for grouping.

Specified by:

cloneView in interface CloneableView

Returns:

cloned view

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: EventCollection

Provides metadata information about the type of object the event collection contains.

Specified by:

getEventType in interface EventCollection

Returns:

metadata for the objects in the collection

iterator

public 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.

Specified by:

iterator in interface EventCollection

Specified by:

iterator in interface Iterable<EventBean>

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()

Description copied from interface: StopCallback

Stops the underlying resources.

Specified by:

stop in interface StopCallback

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()

Specified by:

getViewFactory in interface GroupableView