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java.lang.Objectnet.esper.view.ViewSupport
net.esper.view.window.TimeBatchView
public final class TimeBatchView
A data view that aggregates events in a stream and releases them in one batch at every specified time interval. The view works similar to a time_window but in not continuous. The view releases the batched events after the interval as new data to child views. The prior batch if not empty is released as old data to child view. The view doesn't release intervals with no old or new data. It also does not collect old data published by a parent view. For example, we want to calculate the average of IBM stock every hour, for the last hour. The view accepts 2 parameter combinations. (1) A time interval is supplied with a reference point - based on this point the intervals are set. (1) A time interval is supplied but no reference point - the reference point is set when the first event arrives. If there are no events in the current and prior batch, the view will not invoke the update method of child views. In that case also, no next callback is scheduled with the scheduling service until the next event arrives.
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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TimeBatchView(TimeBatchViewFactory timeBatchViewFactory,
StatementContext statementContext,
long msecIntervalSize,
Long referencePoint,
ViewUpdatedCollection viewUpdatedCollection)
Constructor. |
Method Summary | |
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View |
cloneView(StatementContext statementContext)
Duplicates the view. |
protected static long |
computeWaitMSec(long current,
long reference,
long interval)
Given a current time and a reference time and an interval size, compute the amount of milliseconds till the next interval. |
EventType |
getEventType()
Provides metadata information about the type of object the event collection contains. |
Long |
getInitialReferencePoint()
Gets the reference point to use to anchor interval start and end dates to. |
long |
getMsecIntervalSize()
Returns the interval size in milliseconds. |
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 TimeBatchView(TimeBatchViewFactory timeBatchViewFactory, StatementContext statementContext, long msecIntervalSize, Long referencePoint, ViewUpdatedCollection viewUpdatedCollection)
msecIntervalSize
- is the number of milliseconds to batch events forreferencePoint
- is the reference point onto which to base intervals, or null if
there is no such reference point suppliedviewUpdatedCollection
- is a collection that the view must update when receiving eventstimeBatchViewFactory
- fr copying this view in a group-bystatementContext
- is required view servicesMethod 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 long getMsecIntervalSize()
public final Long getInitialReferencePoint()
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
protected static long computeWaitMSec(long current, long reference, long interval)
current
- is the current timereference
- is the reference pointinterval
- is the interval size
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