package com.bigdata.bop.cost;
import java.io.Serializable;
/**
* Subquery cost report.
*/
public class SubqueryCostReport implements Serializable {
/**
* @todo should be either Externalizable and explicitly managed versioning
* or Serializable with a public interface for versioning.
*/
private static final long serialVersionUID = 1L;
/** The #of graphs against which subqueries will be issued. */
public final int ngraphs;
/** The #of samples to be taken. */
public final int limit;
/** The #of samples taken. */
public final int nsamples;
/**
* An estimated range count based on the samples and adjusted for the
* #of graphs.
*/
public final long rangeCount;
/**
* An estimated cost (latency in milliseconds) based on the samples and
* adjusted for the #of graphs.
*/
public final double cost;
/**
*
* @param ngraphs
* The #of graphs against which subqueries will be issued.
* @param limit
* The #of samples to be taken.
* @param nsamples
* The #of samples taken.
* @param rangeCount
* An estimated range count based on the samples and adjusted
* for the #of graphs.
* @param cost
* An estimated cost (latency in milliseconds) based on the
* samples and adjusted for the #of graphs.
*/
public SubqueryCostReport(final int ngraphs, final int limit,
final int nsamples, final long rangeCount, final double cost) {
if (ngraphs < 0)
throw new IllegalArgumentException();
if (limit < 1)
throw new IllegalArgumentException();
if (nsamples < 0)
throw new IllegalArgumentException();
if (rangeCount < 0)
throw new IllegalArgumentException();
if (cost < 0)
throw new IllegalArgumentException();
this.ngraphs = ngraphs;
this.limit = limit;
this.nsamples = nsamples;
this.rangeCount = rangeCount;
this.cost = cost;
}
/**
* Human readable representation.
*/
public String toString() {
return super.toString() + //
"{ngraphs=" + ngraphs + //
",limit=" + limit + //
",nsamples=" + nsamples + //
",rangeCount=" + rangeCount + //
",cost=" + cost + //
"}";
}
}