com.espertech.esper.common.internal.view.union

Class UnionView

java.lang.Object

com.espertech.esper.common.internal.view.core.ViewSupport

com.espertech.esper.common.internal.view.union.UnionView

All Implemented Interfaces:

AgentInstanceStopCallback, DataWindowView, View, Viewable, ViewDataVisitable, ViewDataVisitableContainer, LastPostObserver, Iterable<EventBean>

public class UnionView
extends ViewSupport
implements LastPostObserver, AgentInstanceStopCallback, DataWindowView, ViewDataVisitableContainer

A view that represents a union of multiple data windows.

The view is parameterized by two or more data windows. From an external viewpoint, the view retains all events that is in any of the data windows (a union).

Field Summary

Fields

Modifier and Type	Field and Description
protected AgentInstanceContext	agentInstanceContext
protected RefCountedSet<EventBean>	unionWindow
protected View[]	views

Fields inherited from class com.espertech.esper.common.internal.view.core.ViewSupport

child, parent

Fields inherited from interface com.espertech.esper.common.internal.context.util.AgentInstanceStopCallback

INSTANCE_NO_ACTION

Constructor Summary

Constructors

Constructor and Description
UnionView(AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext, UnionViewFactory factory, List<View> viewList)

Method Summary

Modifier and Type	Method and Description
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
View[]	getViewContained()
UnionViewFactory	getViewFactory()
Iterator<EventBean>	iterator() Allows iteration through all elements in this viewable.
void	newData(int streamId, EventBean[] newEvents, EventBean[] oldEvents) Receive new and old events from a stream.
void	stop(AgentInstanceStopServices services)
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.
void	visitView(ViewDataVisitor viewDataVisitor)
void	visitViewContainer(ViewDataVisitorContained viewDataVisitor)

Methods inherited from class com.espertech.esper.common.internal.view.core.ViewSupport

getChild, getParent, setChild, setParent

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.common.internal.view.core.View

getParent, setParent

Methods inherited from interface com.espertech.esper.common.internal.view.core.Viewable

getChild, setChild

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

agentInstanceContext

protected final AgentInstanceContext agentInstanceContext

views

protected final View[] views

unionWindow

protected final RefCountedSet<EventBean> unionWindow

Constructor Detail

UnionView

public UnionView(AgentInstanceViewFactoryChainContext agentInstanceViewFactoryContext,
                 UnionViewFactory factory,
                 List<View> viewList)

Method Detail

getViewContained

public View[] getViewContained()

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

getEventType

public EventType getEventType()

Description copied from interface: Viewable

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

Specified by:

getEventType in interface Viewable

Returns:

metadata for the objects in the collection

iterator

public Iterator<EventBean> iterator()

Description copied from interface: Viewable

Allows iteration through all elements in this viewable. 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 Viewable

Specified by:

iterator in interface Iterable<EventBean>

Returns:

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

newData

public void newData(int streamId,
                    EventBean[] newEvents,
                    EventBean[] oldEvents)

Description copied from interface: LastPostObserver

Receive new and old events from a stream.

Specified by:

newData in interface LastPostObserver

Parameters:

streamId - - the stream number sending the events

newEvents - - new events

oldEvents - - old events

stop

public void stop(AgentInstanceStopServices services)

Specified by:

stop in interface AgentInstanceStopCallback

visitViewContainer

public void visitViewContainer(ViewDataVisitorContained viewDataVisitor)

Specified by:

visitViewContainer in interface ViewDataVisitableContainer

visitView

public void visitView(ViewDataVisitor viewDataVisitor)

Specified by:

visitView in interface ViewDataVisitable

getViewFactory

public UnionViewFactory getViewFactory()