com.espertech.esper.view.window

Class TimeAccumViewRStream

java.lang.Object

com.espertech.esper.view.ViewSupport

com.espertech.esper.view.window.TimeAccumViewRStream

All Implemented Interfaces:

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

public class TimeAccumViewRStream
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, also handling the remove stream by keeping set-like semantics. See TimeAccumView for the same behavior without remove stream handling.

Field Summary

Fields

Modifier and Type	Field and Description
protected AgentInstanceViewFactoryChainContext	agentInstanceContext
protected long	callbackScheduledTime
protected LinkedHashMap<EventBean,Long>	currentBatch
protected EPStatementHandleCallback	handle
protected EventBean	lastEvent
protected long	scheduleSlot
protected ExprTimePeriodEvalDeltaConst	timeDeltaComputation

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

EMPTY_VIEW_ARRAY, parent

Constructor Summary

Constructors

Constructor and Description
TimeAccumViewRStream(TimeAccumViewFactory timeBatchViewFactory, AgentInstanceViewFactoryChainContext agentInstanceContext, ExprTimePeriodEvalDeltaConst timeDeltaComputation) Constructor.

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.
ExprTimePeriodEvalDeltaConst	getTimeDeltaComputation()
ViewFactory	getViewFactory()
void	internalHandleAdded(EventBean eventBean, long timestamp)
void	internalHandleRemoved(EventBean anOldData)
boolean	isEmpty() Returns true if the window is empty, or false if not empty.
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()
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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

agentInstanceContext

protected final AgentInstanceViewFactoryChainContext agentInstanceContext

timeDeltaComputation

protected final ExprTimePeriodEvalDeltaConst timeDeltaComputation

scheduleSlot

protected final long scheduleSlot

currentBatch

protected LinkedHashMap<EventBean,Long> currentBatch

lastEvent

protected EventBean lastEvent

callbackScheduledTime

protected long callbackScheduledTime

handle

protected EPStatementHandleCallback handle

Constructor Detail

TimeAccumViewRStream

public TimeAccumViewRStream(TimeAccumViewFactory timeBatchViewFactory,
                            AgentInstanceViewFactoryChainContext agentInstanceContext,
                            ExprTimePeriodEvalDeltaConst timeDeltaComputation)

Constructor.

Parameters:

timeBatchViewFactory - for copying this view in a group-by

agentInstanceContext - context

timeDeltaComputation - time delta eval

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

Returns:

cloned view

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

visitView

public void visitView(ViewDataVisitor viewDataVisitor)

Specified by:

visitView in interface ViewDataVisitable

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 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.

toString

public final String toString()

Overrides:

toString in class Object

stopView

public void stopView()

stop

public void stop()

Description copied from interface: StopCallback

Stops the underlying resources.

Specified by:

stop in interface StopCallback

stopSchedule

public void stopSchedule()

internalHandleRemoved

public void internalHandleRemoved(EventBean anOldData)

internalHandleAdded

public void internalHandleAdded(EventBean eventBean,
                                long timestamp)

getViewFactory

public ViewFactory getViewFactory()

Specified by:

getViewFactory in interface GroupableView