com.espertech.esper.epl.named
Class NamedWindowRootViewInstance

java.lang.Object
  com.espertech.esper.view.ViewSupport
      com.espertech.esper.epl.named.NamedWindowRootViewInstance

All Implemented Interfaces:

EventCollection, View, Viewable, java.lang.Iterable<EventBean>

public class NamedWindowRootViewInstance
extends ViewSupport

The root window in a named window plays multiple roles: It holds the indexes for deleting rows, if any on-delete statement requires such indexes. Such indexes are updated when events arrive, or remove from when a data window or on-delete statement expires events. The view keeps track of on-delete statements their indexes used.

Field Summary

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

EMPTY_VIEW_ARRAY, parent

Constructor Summary

NamedWindowRootViewInstance(NamedWindowRootView rootView, AgentInstanceContext agentInstanceContext)

Method Summary

void	addExplicitIndex(boolean unique, java.lang.String indexName, java.util.List<CreateIndexItem> columns) Add an explicit index.
void	addNewData(EventBean[] newData) Called by tail view to indicate that the data window view has new events that must be added to index tables.
void	destroy() Destroy and clear resources.
java.lang.Iterable<EventBean>	getDataWindowContents()
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
IndexMultiKey[]	getIndexes()
EventTableIndexRepository	getIndexRepository()
VirtualDWView	getVirtualDataWindow()
boolean	isQueryPlanLogging()
boolean	isVirtualDataWindow()
java.util.Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
void	postLoad()
void	removeOldData(EventBean[] oldData) Called by tail view to indicate that the data window view exired events that must be removed from index tables.
void	setDataWindowContents(java.lang.Iterable<EventBean> dataWindowContents) Sets the iterator to use to obtain current named window data window contents.
void	setParent(Viewable parent) Called when the View is added to a Viewable object.
java.util.Collection<EventBean>	snapshot(FilterSpecCompiled optionalFilter, java.lang.annotation.Annotation[] annotations) Return a snapshot using index lookup filters.
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.
void	visitIndexes(StatementAgentInstancePostLoadIndexVisitor visitor)

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

addView, addView, dumpChildViews, dumpUpdateParams, dumpUpdateParams, findDescendent, findViewIndex, getParent, getViews, hasViews, removeAllViews, removeView, removeView, updateChildren, updateChildren

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NamedWindowRootViewInstance

public NamedWindowRootViewInstance(NamedWindowRootView rootView,
                                   AgentInstanceContext agentInstanceContext)

Method Detail

getIndexRepository

public EventTableIndexRepository getIndexRepository()

getIndexes

public IndexMultiKey[] getIndexes()

getDataWindowContents

public java.lang.Iterable<EventBean> getDataWindowContents()

setDataWindowContents

public void setDataWindowContents(java.lang.Iterable<EventBean> dataWindowContents)

Sets the iterator to use to obtain current named window data window contents.

Parameters:

dataWindowContents - iterator over events help by named window

removeOldData

public void removeOldData(EventBean[] oldData)

Called by tail view to indicate that the data window view exired events that must be removed from index tables.

Parameters:

oldData - removed stream of the data window

addNewData

public void addNewData(EventBean[] newData)

Called by tail view to indicate that the data window view has new events that must be added to index tables.

Parameters:

newData - new event

update

public 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.

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

setParent

public void setParent(Viewable parent)

Description copied from interface: View

Called when the View is added to a Viewable object.

Specified by:

setParent in interface View

Overrides:

setParent in class ViewSupport

Parameters:

parent - is the parent that this view is a child of

getEventType

public EventType getEventType()

Description copied from interface: EventCollection

Provides metadata information about the type of object the event collection contains.

Returns:

metadata for the objects in the collection

iterator

public 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.

Returns:

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

destroy

public void destroy()

Destroy and clear resources.

snapshot

public java.util.Collection<EventBean> snapshot(FilterSpecCompiled optionalFilter,
                                                java.lang.annotation.Annotation[] annotations)

Return a snapshot using index lookup filters.

Parameters:

optionalFilter - to index lookup

Returns:

events

addExplicitIndex

public void addExplicitIndex(boolean unique,
                             java.lang.String indexName,
                             java.util.List<CreateIndexItem> columns)
                      throws ExprValidationException

Add an explicit index.

Parameters:

unique - indicator whether unique

indexName - indexname

columns - properties indexed

Throws:

ExprValidationException - if the index fails to be valid

isVirtualDataWindow

public boolean isVirtualDataWindow()

getVirtualDataWindow

public VirtualDWView getVirtualDataWindow()

postLoad

public void postLoad()

visitIndexes

public void visitIndexes(StatementAgentInstancePostLoadIndexVisitor visitor)

isQueryPlanLogging

public boolean isQueryPlanLogging()