com.espertech.esper.epl.named

Class NamedWindowTailViewInstance

java.lang.Object

com.espertech.esper.view.ViewSupport

com.espertech.esper.epl.named.NamedWindowTailViewInstance

All Implemented Interfaces:

EventCollection, 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 NamedWindowMgmtService to consuming statements.

Field Summary

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

EMPTY_VIEW_ARRAY, parent

Constructor Summary

Constructors

Constructor and Description
NamedWindowTailViewInstance(NamedWindowRootViewInstance rootViewInstance, NamedWindowTailView tailView, NamedWindowProcessor namedWindowProcessor, AgentInstanceContext agentInstanceContext)

Method Summary

Modifier and Type	Method and Description
NamedWindowConsumerView	addConsumer(NamedWindowConsumerDesc consumerDesc, boolean isSubselect)
void	destroy() Destroy the view.
AgentInstanceContext	getAgentInstanceContext()
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
long	getNumberOfEvents() Returns the number of events held.
NamedWindowTailView	getTailView()
Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
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.
Collection<EventBean>	snapshot(QueryGraph queryGraph, Annotation[] annotations) Returns a snapshot of window contents, thread-safely
EventBean[]	snapshotDelete(QueryGraph queryGraph, ExprNode filterExpr, Annotation[] annotations)
Collection<EventBean>	snapshotNoLock(QueryGraph queryGraph, Annotation[] annotations)
Collection<EventBean>	snapshotNoLockWithFilter(QueryGraph queryGraph, Annotation[] annotations, ExprNode filterExpr, ExprEvaluatorContext exprEvaluatorContext)
EventBean[]	snapshotUpdate(QueryGraph queryGraph, ExprNode optionalWhereClause, EventBeanUpdateHelper updateHelper, Annotation[] annotations)
void	stop()
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.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 java.lang.Iterable

forEach, spliterator

Constructor Detail

NamedWindowTailViewInstance

public NamedWindowTailViewInstance(NamedWindowRootViewInstance rootViewInstance,
                                   NamedWindowTailView tailView,
                                   NamedWindowProcessor namedWindowProcessor,
                                   AgentInstanceContext agentInstanceContext)

Method Detail

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: 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.

snapshot

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

Returns a snapshot of window contents, thread-safely

Parameters:

queryGraph - query graph

annotations - annotations

Returns:

window contents

snapshotUpdate

public EventBean[] snapshotUpdate(QueryGraph queryGraph,
                                  ExprNode optionalWhereClause,
                                  EventBeanUpdateHelper updateHelper,
                                  Annotation[] annotations)

snapshotDelete

public EventBean[] snapshotDelete(QueryGraph queryGraph,
                                  ExprNode filterExpr,
                                  Annotation[] annotations)

snapshotNoLock

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

snapshotNoLockWithFilter

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