Package org.apache.druid.server

Class QueryResourceQueryResultPusherFactory.QueryResourceQueryResultPusher

java.lang.Object

org.apache.druid.server.QueryResultPusher

org.apache.druid.server.QueryResourceQueryResultPusherFactory.QueryResourceQueryResultPusher

Enclosing class:

QueryResourceQueryResultPusherFactory

public static class QueryResourceQueryResultPusherFactory.QueryResourceQueryResultPusher
extends QueryResultPusher

Handles query results for QueryResource, pushing the results to the client.

It uses the provided QueryLifecycle to execute the query and writes the results via QueryResource.NativeQueryWriter.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.druid.server.QueryResultPusher

QueryResultPusher.ResultsWriter, QueryResultPusher.StreamingHttpResponseAccumulator, QueryResultPusher.Writer

Field Summary

Fields inherited from class org.apache.druid.server.QueryResultPusher

RESULT_TRAILER_HEADERS

Constructor Summary

Constructors

Constructor	Description
QueryResourceQueryResultPusher(com.fasterxml.jackson.databind.ObjectMapper jsonMapper, ResponseContextConfig responseContextConfig, DruidNode selfNode, QueryResource.QueryMetricCounter counter, javax.servlet.http.HttpServletRequest req, QueryLifecycle queryLifecycle, ResourceIOReaderWriterFactory.ResourceIOReaderWriter io)

Method Summary

Modifier and Type	Method	Description
QueryResultPusher.ResultsWriter	start()	Builds a ResultsWriter to start the lifecycle of the QueryResultPusher.
void	writeException(Exception e, OutputStream out)

Methods inherited from class org.apache.druid.server.QueryResultPusher

handleDruidExceptionBeforeResponseStarted, push

Methods inherited from class java.lang.Object

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

Constructor Details

QueryResourceQueryResultPusher

public QueryResourceQueryResultPusher(com.fasterxml.jackson.databind.ObjectMapper jsonMapper,
 ResponseContextConfig responseContextConfig,
 DruidNode selfNode,
 QueryResource.QueryMetricCounter counter,
 javax.servlet.http.HttpServletRequest req,
 QueryLifecycle queryLifecycle,
 ResourceIOReaderWriterFactory.ResourceIOReaderWriter io)

Method Details

start

public QueryResultPusher.ResultsWriter start()

Description copied from class: QueryResultPusher

Builds a ResultsWriter to start the lifecycle of the QueryResultPusher. The ResultsWriter encapsulates the logic to run the query, serialize it and also report success/failure.

This response must not be null. The job of this ResultsWriter is largely to provide lifecycle management to the query running and reporting, so this object must never be null.

This start() method should do as little work as possible, it should really just make the ResultsWriter and return.

Specified by:

start in class QueryResultPusher

Returns:

a new ResultsWriter

writeException

public void writeException(Exception e,
 OutputStream out)
                    throws IOException

Specified by:

writeException in class QueryResultPusher

Throws:

IOException