com.bigdata.rdf.graph.util

Class GASUtil

java.lang.Object

com.bigdata.rdf.graph.util.GASUtil

public class GASUtil
extends Object

Utility class for operations on the public interfaces.

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
static Iterator<org.openrdf.model.Statement>	EMPTY_EDGES_ITERATOR An empty edge iterator.
static Iterator<org.openrdf.model.Value>	EMPTY_VERTICES_ITERATOR An empty vertex iterator.

Constructor Summary

Constructors

Constructor and Description
GASUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static double	fanOut(int frontierSize, long nedges) The average fan out of the frontier.
static long	getTEPS(long nedges, long elapsedNanos) The traversed edges per second.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_VERTICES_ITERATOR

public static final Iterator<org.openrdf.model.Value> EMPTY_VERTICES_ITERATOR

An empty vertex iterator.

EMPTY_EDGES_ITERATOR

public static final Iterator<org.openrdf.model.Statement> EMPTY_EDGES_ITERATOR

An empty edge iterator.

Constructor Detail

GASUtil

public GASUtil()

Method Detail

fanOut

public static double fanOut(int frontierSize,
            long nedges)

The average fan out of the frontier.

Parameters:

frontierSize - The size of the frontier.

nedges - The number of edges visited when mapping the operation across that frontier.

Returns:

The average fan out.

getTEPS

public static long getTEPS(long nedges,
           long elapsedNanos)

The traversed edges per second.

Parameters:

nedges - The number of traversed edges.

elapsedNanos - The elapsed time (nanoseconds).

Returns:

The traversed edges per second.