com.facebook.presto.spi.prerequisites

Interface QueryPrerequisites

public interface QueryPrerequisites

An interface to plugin custom business logic that will be executed before the query is queued.

Method Summary

Modifier and Type	Method and Description
default void	queryFinished(QueryId queryId) Optional method for the implementations to implement if they want to be informed about the finishing of queries (either successfully or unsuccessfully).
CompletableFuture<?>	waitForPrerequisites(QueryId queryId, QueryPrerequisitesContext context, WarningCollector warningCollector) Given the query context, implementations can perform actions or ensure that all conditions are ready for the query to execute.

Method Detail

waitForPrerequisites

CompletableFuture<?> waitForPrerequisites(QueryId queryId,
                                          QueryPrerequisitesContext context,
                                          WarningCollector warningCollector)

Given the query context, implementations can perform actions or ensure that all conditions are ready for the query to execute. The returned CompletableFuture will indicate when the query is ready to be queued for execution. If the returned future finishes successfully, it will trigger the query to be queued and its failure will fail the query.

queryFinished

default void queryFinished(QueryId queryId)

Optional method for the implementations to implement if they want to be informed about the finishing of queries (either successfully or unsuccessfully).