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java.lang.Objectnet.esper.view.ViewSupport
net.esper.view.window.TimeWindowView
public final class TimeWindowView
This view is a moving timeWindow extending the specified amount of milliseconds into the past. The view bases the timeWindow on the time obtained from the scheduling service. All incoming events receive a timestamp and are placed in a sorted map by timestamp. The view does not care about old data published by the parent view to this view. 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.
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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TimeWindowView()
Default constructor - required by all views to adhere to the Java bean specification. |
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TimeWindowView(double secondsBeforeExpiry)
Constructor. |
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TimeWindowView(int secondsBeforeExpiry)
Constructor. |
Method Summary | |
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java.lang.String |
attachesTo(Viewable parentView)
Return null if the view will accept being attached to a particular object. |
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. |
ViewServiceContext |
getContext()
Returns context holder. |
EventType |
getEventType()
Provides metadata information about the type of object the event collection contains. |
long |
getMillisecondsBeforeExpiry()
Returns the size of the time window in millisecond. |
java.util.Iterator<EventBean> |
iterator()
Allows iteration through all elements in this event collection. |
void |
setContextAware(ViewServiceContext context)
Set the services context containing service handles. |
void |
setMillisecondsBeforeExpiry(long millisecondsBeforeExpiry)
Sets the size of the time window in millisecond. |
java.lang.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, shallowCopyView, 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 TimeWindowView()
public TimeWindowView(int secondsBeforeExpiry)
secondsBeforeExpiry
- is the number of seconds before events gets pushed
out of the timeWindow as oldData in the update method.public TimeWindowView(double secondsBeforeExpiry)
secondsBeforeExpiry
- is the number of seconds before events gets pushed
out of the timeWindow as oldData in the update method.Method Detail |
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public final long getMillisecondsBeforeExpiry()
public final void setMillisecondsBeforeExpiry(long millisecondsBeforeExpiry)
millisecondsBeforeExpiry
- size of windowpublic final java.lang.String attachesTo(Viewable parentView)
View
attachesTo
in interface View
parentView
- is the potential parent for this view
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 expire()
public final java.util.Iterator<EventBean> iterator()
EventCollection
iterator
in interface java.lang.Iterable<EventBean>
iterator
in interface EventCollection
public final java.lang.String toString()
toString
in class java.lang.Object
public final void setContextAware(ViewServiceContext context)
ContextAwareView
setContextAware
in interface ContextAwareView
context
- with service handlespublic final ViewServiceContext getContext()
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