Package org.apache.druid.query

Interface GenericQueryMetricsFactory

All Known Implementing Classes:

DefaultGenericQueryMetricsFactory

public interface GenericQueryMetricsFactory

This factory is used for DI of custom QueryMetrics implementations for all query types, which don't (yet) need to emit custom dimensions and/or metrics, i. e. they are good with the generic QueryMetrics interface. Implementations could be injected using PolyBind .optionBinder(binder, Key.get(GenericQueryMetricsFactory.class)) .addBinding("myCustomGenericQueryMetricsFactory") .to(MyCustomGenericQueryMetricsFactory.class); And then setting property: druid.query.generic.queryMetricsFactory=myCustomGenericQueryMetricsFactory Unlike QueryMetrics itself, this interface is considered stable and is expected to be injected into custom Query extensions that do not want to worry about the potential instability of QueryMetrics.

Method Summary

Modifier and Type	Method	Description
QueryMetrics<Query<?>>	makeMetrics()	Creates a QueryMetrics which doesn't have predefined QueryMetrics subclass.
QueryMetrics<Query<?>>	makeMetrics(Query<?> query)	Creates a QueryMetrics for query, which doesn't have predefined QueryMetrics subclass.

Method Details

makeMetrics

QueryMetrics<Query<?>> makeMetrics(Query<?> query)

Creates a QueryMetrics for query, which doesn't have predefined QueryMetrics subclass. This method must call QueryMetrics.query(Query) with the given query on the created QueryMetrics object before returning.

makeMetrics

QueryMetrics<Query<?>> makeMetrics()

Creates a QueryMetrics which doesn't have predefined QueryMetrics subclass. This method is used by the router to build a QueryMetrics for SQL queries. It is needed since at router, there is no native query linked to a SQL query.