public class TimeWindowView extends ViewSupport implements CloneableView, DataWindowView, ScheduleAdjustmentCallback, StoppableView, StopCallback
Events leave or expire from the time timeWindow by means of a scheduled callback registered with the scheduling service. Thus child views receive updates containing old data only asynchronously as the system-time-based timeWindow moves on. However child views receive updates containing new data as soon as the new data arrives.
| Modifier and Type | Field and Description |
|---|---|
protected AgentInstanceViewFactoryChainContext |
agentInstanceContext |
protected TimeWindow |
timeWindow |
EMPTY_VIEW_ARRAY, parent| Constructor and Description |
|---|
TimeWindowView(AgentInstanceViewFactoryChainContext agentInstanceContext,
TimeWindowViewFactory timeWindowViewFactory,
ExprTimePeriodEvalDeltaConst timeDeltaComputation,
ViewUpdatedCollection viewUpdatedCollection)
Constructor.
|
| Modifier and Type | Method and Description |
|---|---|
void |
adjust(long delta)
Adjust expiration date.
|
View |
cloneView()
Duplicates the view.
|
protected void |
expire()
This method removes (expires) objects from the window and schedules a new callback for the
time when the next oldest message would expire from the window.
|
EventType |
getEventType()
Provides metadata information about the type of object the event collection contains.
|
ExprTimePeriodEvalDeltaConst |
getTimeDeltaComputation() |
ViewFactory |
getViewFactory() |
ViewUpdatedCollection |
getViewUpdatedCollection()
Returns the (optional) collection handling random access to window contents for prior or previous events.
|
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 |
scheduleExpiryCallback() |
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) |
addView, addView, dumpChildViews, dumpUpdateParams, dumpUpdateParams, findDescendent, findViewIndex, getParent, getViews, hasViews, removeAllViews, removeView, removeView, setParent, updateChildren, updateChildrenclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitaddView, getViews, hasViews, removeAllViews, removeViewforEach, spliteratorprotected final TimeWindow timeWindow
protected final AgentInstanceViewFactoryChainContext agentInstanceContext
public TimeWindowView(AgentInstanceViewFactoryChainContext agentInstanceContext, TimeWindowViewFactory timeWindowViewFactory, ExprTimePeriodEvalDeltaConst timeDeltaComputation, ViewUpdatedCollection viewUpdatedCollection)
timeDeltaComputation - is the computation for the number of milliseconds before events gets pushed
out of the timeWindow as oldData in the update method.viewUpdatedCollection - is a collection the view must update when receiving eventstimeWindowViewFactory - for copying the view in a group-byagentInstanceContext - contextpublic void adjust(long delta)
ScheduleAdjustmentCallbackadjust in interface ScheduleAdjustmentCallbackdelta - to adjustpublic View cloneView()
CloneableViewExpected to return a same view in initialized state for grouping.
cloneView in interface CloneableViewpublic ViewUpdatedCollection getViewUpdatedCollection()
public final EventType getEventType()
EventCollectiongetEventType in interface EventCollectionpublic final void update(EventBean[] newData, EventBean[] oldData)
ViewIf 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.
protected final void expire()
protected void scheduleExpiryCallback()
public ExprTimePeriodEvalDeltaConst getTimeDeltaComputation()
public final Iterator<EventBean> iterator()
EventCollectioniterator in interface EventCollectioniterator in interface Iterable<EventBean>public boolean isEmpty()
public void stopView()
public void stop()
StopCallbackstop in interface StopCallbackpublic void stopSchedule()
public void visitView(ViewDataVisitor viewDataVisitor)
visitView in interface ViewDataVisitablepublic ViewFactory getViewFactory()
getViewFactory in interface GroupableView