Package com.vaadin.flow.server.data

Class DataCountEndedEvent

java.lang.Object

java.util.EventObject

com.vaadin.flow.server.data.AbstractDataCountEvent

com.vaadin.flow.server.data.DataCountEndedEvent

All Implemented Interfaces:

Serializable

public class DataCountEndedEvent
extends AbstractDataCountEvent

Event fired through the service event bus once a count query has returned or thrown, on the thread that issued it.

Fired in reverse listener registration order, so that listeners nest around the matching DataCountStartedEvent. It is fired whether the query returned normally or threw, so a listener can clean up its state in one place.

The event tells how long the query took and, through a count of -1, whether it threw, so a listener that times count queries needs no state of its own and no listener for the started or failed event.

Since:

25.3

See Also:

• AbstractDataCountEvent
• Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
DataCountEndedEvent(UI ui, Component component, boolean filtered, int count)	Creates a new event for a count query whose duration was not measured.
DataCountEndedEvent(UI ui, Component component, boolean filtered, int count, Duration duration)	Creates a new event carrying the measured duration of the count query.

Method Summary

Modifier and Type	Method	Description
int	getCount()	Gets the number of items the data provider reported.
Duration	getDuration()	Gets how long the count query took, measured from just before the DataCountStartedEvent was fired until the query returned or threw.

Methods inherited from class com.vaadin.flow.server.data.AbstractDataCountEvent

getComponent, getSource, getUI, isFiltered

Methods inherited from class java.util.EventObject

toString

Methods inherited from class java.lang.Object

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

Constructor Details

DataCountEndedEvent

public DataCountEndedEvent(UI ui,
 Component component,
 boolean filtered,
 int count)

Creates a new event for a count query whose duration was not measured.

The event reports a zero duration. Use DataCountEndedEvent(UI, Component, boolean, int, Duration) to create an event with a measured duration.

Parameters:

ui - the UI the counting component belongs to, not null

component - the component whose data is being counted, or null if it could not be resolved

filtered - whether a filter was set on the query

count - the number of items the data provider reported, or -1 if the query threw, in which case a DataCountFailedEvent carrying the throwable was fired first

DataCountEndedEvent

public DataCountEndedEvent(UI ui,
 Component component,
 boolean filtered,
 int count,
 Duration duration)

Creates a new event carrying the measured duration of the count query.

Parameters:

ui - the UI the counting component belongs to, not null

component - the component whose data is being counted, or null if it could not be resolved

filtered - whether a filter was set on the query

count - the number of items the data provider reported, or -1 if the query threw, in which case a DataCountFailedEvent carrying the throwable was fired first

duration - the time from just before the started event was fired until the query returned or threw, not null

Since:

25.4

Method Details

getCount

public int getCount()

Gets the number of items the data provider reported.

A value of -1 is how this event reports that the query threw, so a listener can tell a failed query from an empty result without listening for DataCountFailedEvent, which carries the throwable itself.

Returns:

the count, or -1 if the query threw

getDuration

public Duration getDuration()

Gets how long the count query took, measured from just before the DataCountStartedEvent was fired until the query returned or threw. It includes the time the listeners of the started and failed events took, but not the time spent on this event.

Returns:

the duration, never negative

Since:

25.4