org.apache.lens.driver.jdbc

Class MaxJDBCConnectionCheckConstraint

java.lang.Object

org.apache.lens.driver.jdbc.MaxJDBCConnectionCheckConstraint

All Implemented Interfaces:

QueryLaunchingConstraint

public class MaxJDBCConnectionCheckConstraint
extends Object
implements QueryLaunchingConstraint

Constructor Summary

Constructors

Constructor and Description
MaxJDBCConnectionCheckConstraint(int poolMaxSize)

Method Summary

Modifier and Type	Method and Description
String	allowsLaunchOf(QueryContext candidateQuery, EstimatedImmutableQueryCollection launchedQueries) Returns whether this constraint allows candidate query to be launched.

Methods inherited from class java.lang.Object

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

Constructor Detail

MaxJDBCConnectionCheckConstraint

public MaxJDBCConnectionCheckConstraint(int poolMaxSize)

Method Detail

allowsLaunchOf

public String allowsLaunchOf(QueryContext candidateQuery,
                             EstimatedImmutableQueryCollection launchedQueries)

Description copied from interface: QueryLaunchingConstraint

Returns whether this constraint allows candidate query to be launched.

Specified by:

allowsLaunchOf in interface QueryLaunchingConstraint

Parameters:

candidateQuery - The query which is the next candidate to be launched.

launchedQueries - Current launched queries

Returns:

null if allowed to launch, otherwise a String containing the reason to block launch