com.bigdata.service

Class ServiceScore

java.lang.Object

com.bigdata.service.ServiceScore

All Implemented Interfaces:

Comparable<ServiceScore>

public class ServiceScore
extends Object
implements Comparable<ServiceScore>

Per-service metadata and a score for that service which gets updated periodically by the LoadBalancerService.UpdateTask. ServiceScores are a resource utilization measure. They are higher for a service which is more highly utilized. There are several ways to look at the score, including the rawScore, the rank, and the normalized double-precision rank. The ranks move in the same direction as the rawScores - a higher rank indicates higher utilization. The least utilized service is always rank zero (0). The most utilized service is always in the last rank.

Version:

$Id$

Author:

Bryan Thompson

Field Summary

Fields

Modifier and Type	Field and Description
double	drank The normalized double precision rank in [0.0:1.0].
String	hostname
int	rank The rank in [0:#scored].
double	rawScore The raw score computed for that service.
double	score The normalized score computed for that service.
String	serviceName
UUID	serviceUUID

Constructor Summary

Constructors

Constructor and Description
ServiceScore(String hostname, UUID serviceUUID, String serviceName) Constructor variant used when you do not have performance counters for the service and could not compute its rawScore.
ServiceScore(String hostname, UUID serviceUUID, String serviceName, double rawScore) Constructor variant used when you have computed the rawStore.

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(ServiceScore arg0) Places elements into order by ascending rawScore.
static double	normalize(double rawScore, double totalRawScore) Normalizes a raw score in the context of totals for some service.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

hostname

public final String hostname

serviceUUID

public final UUID serviceUUID

serviceName

public final String serviceName

rawScore

public final double rawScore

The raw score computed for that service.

score

public double score

The normalized score computed for that service.

rank

public int rank

The rank in [0:#scored]. This is an index into the Scores[].

drank

public double drank

The normalized double precision rank in [0.0:1.0].

Constructor Detail

ServiceScore

public ServiceScore(String hostname,
            UUID serviceUUID,
            String serviceName)

Constructor variant used when you do not have performance counters for the service and could not compute its rawScore.

Parameters:

hostname -

serviceUUID -

ServiceScore

public ServiceScore(String hostname,
            UUID serviceUUID,
            String serviceName,
            double rawScore)

Constructor variant used when you have computed the rawStore.

Parameters:

hostname -

serviceUUID -

rawScore -

Method Detail

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(ServiceScore arg0)

Places elements into order by ascending rawScore. The serviceUUID is used to break any ties.

Specified by:

compareTo in interface Comparable<ServiceScore>

normalize

public static double normalize(double rawScore,
               double totalRawScore)

Normalizes a raw score in the context of totals for some service.

Parameters:

rawScore - The raw score.

totalRawScore - The raw score computed from the totals.

Returns:

The normalized score.