net.esper.view.std
Class SizeView
java.lang.Object
net.esper.view.ViewSupport
net.esper.view.std.SizeView
- All Implemented Interfaces:
- Iterable<EventBean>, CloneableView, EventCollection, View, Viewable
public final class SizeView
- extends ViewSupport
- implements CloneableView
This view is a very simple view presenting the number of elements in a stream or view.
The view computes a single long-typed count of the number of events passed through it similar
to the base statistics COUNT column.
Methods inherited from class net.esper.view.ViewSupport |
addView, dumpChildViews, dumpUpdateParams, findDescendent, getParent, getViews, hasViews, removeView, setParent, updateChildren, updateChildren |
SizeView
public SizeView(ViewServiceContext viewServiceContext)
cloneView
public View cloneView(ViewServiceContext viewServiceContext)
- Specified by:
cloneView
in interface CloneableView
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 viewoldData
- is the old data that has been removed from the parent view
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
createEventType
protected static EventType createEventType(ViewServiceContext viewServiceContext)
- Creates the event type for this view
- Parameters:
viewServiceContext
- is the event adapter service
- Returns:
- event type for view