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

java.lang.Object
  org.apache.lens.server.api.events.LensEvent
      org.apache.lens.server.api.query.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.

Field Summary

protected T	currentValue The current value.
protected UUID	id The id.
protected T	previousValue The previous value.
protected QueryHandle	queryHandle The query handle.

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

eventTime

Constructor Summary

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

Method Summary

String	getEventId()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

previousValue

protected final T previousValue

The previous value.

currentValue

protected final T currentValue

The current value.

queryHandle

protected final QueryHandle queryHandle

The query handle.

id

protected final UUID id

The id.

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