net.esper.view.window
Class TimeAccumViewRStream

java.lang.Object
  extended by net.esper.view.ViewSupport
      extended by net.esper.view.window.TimeAccumViewRStream
All Implemented Interfaces:
Iterable<EventBean>, CloneableView, DataWindowView, EventCollection, View, Viewable

public final class TimeAccumViewRStream
extends ViewSupport
implements CloneableView, DataWindowView

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 inherited from class net.esper.view.ViewSupport
parent
 
Constructor Summary
TimeAccumViewRStream(TimeAccumViewFactory timeBatchViewFactory, StatementContext statementContext, long msecIntervalSize)
          Constructor.
 
Method Summary
 View cloneView(StatementContext statementContext)
          Duplicates the view.
 EventType getEventType()
          Provides metadata information about the type of object the event collection contains.
 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 sendRemoveStream()
          This method sends the remove stream for all accumulated events.
 String toString()
           
 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
addView, dumpChildViews, dumpUpdateParams, findDescendent, getParent, getViews, hasViews, 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 net.esper.view.View
getParent, setParent
 
Methods inherited from interface net.esper.view.Viewable
addView, getViews, hasViews, removeView
 

Constructor Detail

TimeAccumViewRStream

public TimeAccumViewRStream(TimeAccumViewFactory timeBatchViewFactory,
                            StatementContext statementContext,
                            long msecIntervalSize)
Constructor.

Parameters:
msecIntervalSize - is the number of milliseconds to batch events for
timeBatchViewFactory - fr copying this view in a group-by
statementContext - is required view services
Method Detail

cloneView

public View cloneView(StatementContext statementContext)
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
Parameters:
statementContext - is services for the view
Returns:
duplicated view

getMsecIntervalSize

public final long getMsecIntervalSize()
Returns the interval size in milliseconds.

Returns:
batch size

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 final 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

sendRemoveStream

protected final 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 Iterable<EventBean>
Specified by:
iterator in interface EventCollection
Returns:
an iterator which will go through all current elements in the collection.

toString

public final String toString()
Overrides:
toString in class Object

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