com.espertech.esper.view.std
Class GroupByViewReclaimAged

java.lang.Object
  com.espertech.esper.view.ViewSupport
      com.espertech.esper.view.std.GroupByViewReclaimAged

All Implemented Interfaces:

CloneableView, EventCollection, GroupByView, View, Viewable, ViewDataVisitableContainer, java.lang.Iterable<EventBean>

public class GroupByViewReclaimAged
extends ViewSupport
implements CloneableView, GroupByView

Field Summary

protected AgentInstanceViewFactoryChainContext	agentInstanceContext
protected java.lang.String[]	propertyNames
protected java.util.Map<java.lang.Object,GroupByViewAgedEntry>	subViewsPerKey

Fields inherited from class com.espertech.esper.view.ViewSupport

EMPTY_VIEW_ARRAY, parent

Constructor Summary

GroupByViewReclaimAged(AgentInstanceViewFactoryChainContext agentInstanceContext, ExprNode[] criteriaExpressions, ExprEvaluator[] criteriaEvaluators, double reclaimMaxAge, double reclaimFrequency)
Constructor.

Method Summary

View	cloneView() Duplicates the view.
ExprNode[]	getCriteriaExpressions() Returns the field name that provides the key valie by which to group by.
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
java.util.Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
boolean	removeView(View view) Remove a view.
java.lang.String	toString()
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.
void	visitViewContainer(ViewDataVisitorContained viewDataVisitor)

Methods inherited from class com.espertech.esper.view.ViewSupport

addView, addView, dumpChildViews, dumpUpdateParams, dumpUpdateParams, findDescendent, findViewIndex, getParent, getViews, hasViews, removeAllViews, 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 com.espertech.esper.view.View

getParent, setParent

Methods inherited from interface com.espertech.esper.view.Viewable

addView, getViews, hasViews, removeAllViews

Field Detail

agentInstanceContext

protected final AgentInstanceViewFactoryChainContext agentInstanceContext

propertyNames

protected java.lang.String[] propertyNames

subViewsPerKey

protected final java.util.Map<java.lang.Object,GroupByViewAgedEntry> subViewsPerKey

Constructor Detail

GroupByViewReclaimAged

public GroupByViewReclaimAged(AgentInstanceViewFactoryChainContext agentInstanceContext,
                              ExprNode[] criteriaExpressions,
                              ExprEvaluator[] criteriaEvaluators,
                              double reclaimMaxAge,
                              double reclaimFrequency)

Constructor.

Parameters:

agentInstanceContext - contains required view services

criteriaExpressions - is the fields from which to pull the values to group by

reclaimMaxAge - age after which to reclaim group

reclaimFrequency - frequency in which to check for groups to reclaim

Method Detail

cloneView

public View cloneView()

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

getCriteriaExpressions

public ExprNode[] getCriteriaExpressions()

Returns the field name that provides the key valie by which to group by.

Specified by:

getCriteriaExpressions in interface GroupByView

Returns:

field name providing group-by key.

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

iterator

public final java.util.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 EventCollection

Specified by:

iterator in interface java.lang.Iterable<EventBean>

Returns:

an iterator which will go through all current elements in the collection.

toString

public final java.lang.String toString()

Overrides:

toString in class java.lang.Object

visitViewContainer

public void visitViewContainer(ViewDataVisitorContained viewDataVisitor)

Specified by:

visitViewContainer in interface ViewDataVisitableContainer

removeView

public boolean removeView(View view)

Description copied from interface: Viewable

Remove a view.

Specified by:

removeView in interface Viewable

Overrides:

removeView in class ViewSupport

Parameters:

view - to remove

Returns:

true to indicate that the view to be removed existed within this view, false if the view to remove could not be found