Package dev.roanh.gmark.query.shape

Class CycleGenerator

java.lang.Object

dev.roanh.gmark.query.shape.ShapeGenerator

dev.roanh.gmark.query.shape.CycleGenerator

public class CycleGenerator
extends ShapeGenerator

A query generator that generates queries with the conjuncts arranged in a cycle shape. Specifically, the conjuncts form a chain with the last conjunct target variable being the same as the source variable of the first conjunct.

Field Summary

Fields inherited from class dev.roanh.gmark.query.shape.ShapeGenerator

conjGen, gSel, workload

Constructor Summary

Constructors

Constructor	Description
CycleGenerator(Workload workload)	Constructs a new generator for cycle shaped queries.

Method Summary

Modifier and Type	Method	Description
Query	generateQuery()	Generates a new query with a specific shape following the provided workload specification.

Methods inherited from class dev.roanh.gmark.query.shape.ShapeGenerator

createVariables, randomArity, randomConjunctNumber, randomSelectivity

Methods inherited from class java.lang.Object

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

Constructor Details

CycleGenerator

public CycleGenerator(Workload workload)

Constructs a new generator for cycle shaped queries.

Parameters:

workload - The workload specification.

Method Details

generateQuery

public Query generateQuery()
                    throws GenerationException

Description copied from class: ShapeGenerator

Generates a new query with a specific shape following the provided workload specification.

Specified by:

generateQuery in class ShapeGenerator

Returns:

The generated query.

Throws:

GenerationException - When generating the query failed for some reason.