org.apache.lens.server.api.query.events

Class QueryEvent<T>

java.lang.Object

org.apache.lens.server.api.events.LensEvent

org.apache.lens.server.api.query.events.QueryEvent<T>

Type Parameters:

T - Type of changed information about the query

Direct Known Subclasses:

PriorityChange, QueryAccepted, QueryRejected, QueuePositionChange, StatusChange

public abstract class QueryEvent<T>
extends LensEvent

A generic event related to state change of a query Subclasses must declare the specific type of change they are interested in.

Every event will have an ID, which should be used by listeners to check if the event is already received.

Constructor Summary

Constructors

Constructor and Description
QueryEvent(long eventTime, T prev, T current, QueryHandle handle) Instantiates a new query event.

Method Summary

Modifier and Type	Method and Description
T	getCurrentValue() The current value.
String	getEventId()
T	getPreviousValue() The previous value.
QueryHandle	getQueryHandle() The query handle.
String	toString()

Methods inherited from class org.apache.lens.server.api.events.LensEvent

getEventTime

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

QueryEvent

public QueryEvent(long eventTime,
                  T prev,
                  T current,
                  QueryHandle handle)

Instantiates a new query event.

Parameters:

eventTime - the event time

prev - the prev

current - the current

handle - the handle

Method Detail

getEventId

public String getEventId()

Specified by:

getEventId in class LensEvent

toString

public String toString()

Overrides:

toString in class Object

getPreviousValue

@Generated(value="lombok")
public T getPreviousValue()

The previous value.

getCurrentValue

@Generated(value="lombok")
public T getCurrentValue()

The current value.

getQueryHandle

@Generated(value="lombok")
public QueryHandle getQueryHandle()

The query handle.