com.espertech.esper.epl.table.onaction

Class TableOnViewBase

java.lang.Object

com.espertech.esper.view.ViewSupport

com.espertech.esper.epl.table.onaction.TableOnViewBase

All Implemented Interfaces:

StopCallback, EventCollection, View, Viewable, Iterable<EventBean>

Direct Known Subclasses:

TableOnDeleteView, TableOnMergeView, TableOnSelectView, TableOnUpdateView

public abstract class TableOnViewBase
extends ViewSupport
implements StopCallback

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	acquireWriteLock
protected ExprEvaluatorContext	exprEvaluatorContext
protected SubordWMatchExprLookupStrategy	lookupStrategy
protected TableMetadata	metadata
protected TableStateInstance	tableStateInstance

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

EMPTY_VIEW_ARRAY, parent

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TableOnViewBase(SubordWMatchExprLookupStrategy lookupStrategy, TableStateInstance tableStateInstance, ExprEvaluatorContext exprEvaluatorContext, TableMetadata metadata, boolean acquireWriteLock)

Method Summary

Modifier and Type	Method and Description
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
ExprEvaluatorContext	getExprEvaluatorContext() returns expr context.
abstract void	handleMatching(EventBean[] triggerEvents, EventBean[] matchingEvents)
Iterator<EventBean>	iterator() Allows iteration through all elements in this event collection.
void	stop() Stops the underlying resources.
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.

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

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

lookupStrategy

protected final SubordWMatchExprLookupStrategy lookupStrategy

tableStateInstance

protected final TableStateInstance tableStateInstance

exprEvaluatorContext

protected final ExprEvaluatorContext exprEvaluatorContext

metadata

protected final TableMetadata metadata

acquireWriteLock

protected final boolean acquireWriteLock

Constructor Detail

TableOnViewBase

protected TableOnViewBase(SubordWMatchExprLookupStrategy lookupStrategy,
                          TableStateInstance tableStateInstance,
                          ExprEvaluatorContext exprEvaluatorContext,
                          TableMetadata metadata,
                          boolean acquireWriteLock)

Method Detail

handleMatching

public abstract void handleMatching(EventBean[] triggerEvents,
                                    EventBean[] matchingEvents)

stop

public void stop()

Description copied from interface: StopCallback

Stops the underlying resources.

Specified by:

stop in interface StopCallback

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.

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

getExprEvaluatorContext

public ExprEvaluatorContext getExprEvaluatorContext()

returns expr context.

Returns:

context

iterator

public 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 Iterable<EventBean>

Returns:

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

getEventType

public 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