org.apache.drill.test

Class BufferingQueryEventListener

java.lang.Object

org.apache.drill.test.BufferingQueryEventListener

All Implemented Interfaces:

UserResultsListener

public class BufferingQueryEventListener
extends Object
implements UserResultsListener

Drill query event listener that buffers rows into a producer-consumer queue. Allows rows to be received asynchronously, but processed by a synchronous reader.

Query messages are transformed into events: query ID, batch, EOF or error.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BufferingQueryEventListener.QueryEvent

Constructor Summary

Constructors

Constructor and Description
BufferingQueryEventListener()

Method Summary

Modifier and Type	Method and Description
void	dataArrived(QueryDataBatch result, ConnectionThrottle throttle) A QueryData message was received
BufferingQueryEventListener.QueryEvent	get()
void	queryCompleted(UserBitShared.QueryResult.QueryState state) The query has completed (successful completion or cancellation).
void	queryIdArrived(UserBitShared.QueryId queryId) QueryId is available.
void	submissionFailed(UserException ex) The query has failed.

Methods inherited from class java.lang.Object

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

Constructor Detail

BufferingQueryEventListener

public BufferingQueryEventListener()

Method Detail

queryIdArrived

public void queryIdArrived(UserBitShared.QueryId queryId)

Description copied from interface: UserResultsListener

QueryId is available. Called when a query is successfully submitted to the server.

Specified by:

queryIdArrived in interface UserResultsListener

Parameters:

queryId - sent by the server along Acks.OK

submissionFailed

public void submissionFailed(UserException ex)

Description copied from interface: UserResultsListener

The query has failed. Most likely called when the server returns a FAILED query state. Can also be called if dataArrived() throws an exception

Specified by:

submissionFailed in interface UserResultsListener

Parameters:

ex - exception describing the cause of the failure

dataArrived

public void dataArrived(QueryDataBatch result,
                        ConnectionThrottle throttle)

Description copied from interface: UserResultsListener

A QueryData message was received

Specified by:

dataArrived in interface UserResultsListener

Parameters:

result - data batch received

throttle - connection throttle

queryCompleted

public void queryCompleted(UserBitShared.QueryResult.QueryState state)

Description copied from interface: UserResultsListener

The query has completed (successful completion or cancellation). The listener will not receive any other data or result message. Called when the server returns a terminal-non failing- state (COMPLETED or CANCELLED)

Specified by:

queryCompleted in interface UserResultsListener

get

public BufferingQueryEventListener.QueryEvent get()