com.espertech.esper.view.window
Class TimeAccumView

java.lang.Object
  com.espertech.esper.view.ViewSupport
      com.espertech.esper.view.window.TimeAccumView

All Implemented Interfaces:

StopCallback, CloneableView, DataWindowView, EventCollection, GroupableView, StoppableView, View, Viewable, ViewDataVisitable, java.lang.Iterable<EventBean>

public class TimeAccumView
extends ViewSupport
implements CloneableView, DataWindowView, StoppableView, StopCallback

A data window view that holds events in a stream and only removes events from a stream (rstream) if no more events arrive for a given time interval.

No batch version of the view exists as the batch version is simply the remove stream of this view, which removes in batches.

The view is continuous, the insert stream consists of arriving events. The remove stream only posts current window contents when no more events arrive for a given timer interval.

Field Summary

protected AgentInstanceViewFactoryChainContext	agentInstanceContext
protected long	callbackScheduledTime
protected java.util.ArrayList<EventBean>	currentBatch
protected EPStatementHandleCallback	handle
protected ScheduleSlot	scheduleSlot
protected ExprTimePeriodEvalDeltaConst	timeDeltaComputation
protected ViewUpdatedCollection	viewUpdatedCollection

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

EMPTY_VIEW_ARRAY, parent

Constructor Summary

TimeAccumView(TimeAccumViewFactory timeBatchViewFactory, AgentInstanceViewFactoryChainContext agentInstanceContext, ExprTimePeriodEvalDeltaConst timeDeltaComputation, ViewUpdatedCollection viewUpdatedCollection)
Constructor.

Method Summary

View	cloneView() Duplicates the view.
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
ExprTimePeriodEvalDeltaConst	getTimeDeltaComputation()
ViewFactory	getViewFactory()
boolean	isEmpty() Returns true if the window is empty, or false if not empty.
java.util.Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
protected void	sendRemoveStream() This method sends the remove stream for all accumulated events.
void	stop() Stops the underlying resources.
void	stopSchedule()
void	stopView()
java.lang.String	toString()
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.
void	visitView(ViewDataVisitor 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, 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

Field Detail

agentInstanceContext

protected final AgentInstanceViewFactoryChainContext agentInstanceContext

timeDeltaComputation

protected final ExprTimePeriodEvalDeltaConst timeDeltaComputation

viewUpdatedCollection

protected final ViewUpdatedCollection viewUpdatedCollection

scheduleSlot

protected final ScheduleSlot scheduleSlot

currentBatch

protected java.util.ArrayList<EventBean> currentBatch

callbackScheduledTime

protected long callbackScheduledTime

handle

protected EPStatementHandleCallback handle

Constructor Detail

TimeAccumView

public TimeAccumView(TimeAccumViewFactory timeBatchViewFactory,
                     AgentInstanceViewFactoryChainContext agentInstanceContext,
                     ExprTimePeriodEvalDeltaConst timeDeltaComputation,
                     ViewUpdatedCollection viewUpdatedCollection)

Constructor.

Parameters:

viewUpdatedCollection - is a collection that the view must update when receiving events

timeBatchViewFactory - fr copying this view in a group-by

agentInstanceContext - is required view services

Method Detail

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

getTimeDeltaComputation

public ExprTimePeriodEvalDeltaConst getTimeDeltaComputation()

getEventType

public final 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

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

sendRemoveStream

protected void sendRemoveStream()

This method sends the remove stream for all accumulated events.

isEmpty

public boolean isEmpty()

Returns true if the window is empty, or false if not empty.

Returns:

true if empty

iterator

public final 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.

Specified by:

iterator in interface EventCollection

Specified by:

iterator in interface java.lang.Iterable<EventBean>

Returns:

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

toString

public final java.lang.String toString()

Overrides:

toString in class java.lang.Object

stopView

public void stopView()

Specified by:

stopView in interface StoppableView

stop

public void stop()

Description copied from interface: StopCallback

Stops the underlying resources.

Specified by:

stop in interface StopCallback

stopSchedule

public void stopSchedule()

visitView

public void visitView(ViewDataVisitor viewDataVisitor)

Specified by:

visitView in interface ViewDataVisitable

getViewFactory

public ViewFactory getViewFactory()

Specified by:

getViewFactory in interface GroupableView