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org.apache.lens.server.api.events
Interface LensEventListener<T extends LensEvent>

Type Parameters:

T - the generic type

All Known Implementing Classes:

AsyncEventListener, LogStatisticsStore, MetricsServiceImpl.AsyncQueryStatusListener, QueryEndNotifier, QueryExecutionServiceImpl.QueryStatusLogger, QueryExecutionStatisticsGenerator, ResultFormatter, StatisticsLogPartitionHandler, StatisticsStore

public interface LensEventListener<T extends LensEvent>

The handler method should not block so that the event service can proceed to notifying other listeners as soon as possible. Any resource intensive computation related to the event must be done offline.

See Also:

LensEvent

Field Summary

static String

HANDLER_METHOD_NAME The Constant HANDLER_METHOD_NAME.

Method Summary

void	onEvent(T event) On event.

Field Detail

HANDLER_METHOD_NAME

static final String HANDLER_METHOD_NAME

The Constant HANDLER_METHOD_NAME.

See Also:

Constant Field Values

Method Detail

onEvent

void onEvent(T event)
             throws LensException

On event.

Parameters:

event - the event

Throws:

LensException - the lens exception