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java.lang.Objectnet.esper.view.ViewSupport
net.esper.view.window.LengthBatchView
public final class LengthBatchView
A data view that aggregates events in a stream and releases them in one batch when a maximum number of events has been collected.
The view works similar to a length_window but is not continuous, and similar to a time_batch however is not time-based but reacts to the number of events.
The view releases the batched events, when a certain number of batched events has been reached or exceeded, as new data to child views. The prior batch if not empty is released as old data to any child views. The view doesn't release intervals with no old or new data. It also does not collect old data published by a parent view.
If there are no events in the current and prior batch, the view will not invoke the update method of child views.
Field Summary |
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Fields inherited from class net.esper.view.ViewSupport |
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parent |
Constructor Summary | |
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LengthBatchView(LengthBatchViewFactory lengthBatchViewFactory,
int size,
ViewUpdatedCollection viewUpdatedCollection)
Constructor. |
Method Summary | |
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View |
cloneView(StatementContext statementContext)
Duplicates the view. |
EventType |
getEventType()
Provides metadata information about the type of object the event collection contains. |
int |
getSize()
Returns the number of events to batch (data window size). |
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 |
sendBatch()
This method updates child views and clears the batch of events. |
String |
toString()
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void |
update(EventBean[] newData,
EventBean[] oldData)
Notify that data has been added or removed from the Viewable parent. |
Methods inherited from class net.esper.view.ViewSupport |
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addView, dumpChildViews, dumpUpdateParams, findDescendent, getParent, getViews, hasViews, removeView, setParent, updateChildren, updateChildren |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface net.esper.view.View |
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getParent, setParent |
Methods inherited from interface net.esper.view.Viewable |
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addView, getViews, hasViews, removeView |
Constructor Detail |
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public LengthBatchView(LengthBatchViewFactory lengthBatchViewFactory, int size, ViewUpdatedCollection viewUpdatedCollection)
size
- is the number of events to batchviewUpdatedCollection
- is a collection that the view must update when receiving eventslengthBatchViewFactory
- for copying this view in a group-byMethod Detail |
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public View cloneView(StatementContext statementContext)
CloneableView
Expected to return a same view in initialized state for grouping.
cloneView
in interface CloneableView
statementContext
- is services for the view
public final int getSize()
public final EventType getEventType()
EventCollection
getEventType
in interface EventCollection
public final void update(EventBean[] newData, EventBean[] oldData)
View
update
in interface View
newData
- is the new data that has been added to the parent viewoldData
- is the old data that has been removed from the parent viewprotected final void sendBatch()
public boolean isEmpty()
public final Iterator<EventBean> iterator()
EventCollection
iterator
in interface Iterable<EventBean>
iterator
in interface EventCollection
public final String toString()
toString
in class Object
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