forked from ssrini/scalr
/
Sensor.php
63 lines (52 loc) · 1.77 KB
/
Sensor.php
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<?php
abstract class Scalr_Scaling_Sensor
{
private static $sensors = array();
/**
* Whether this sensor has inverted logic
*
* @var bool
*/
public $isInvert = false;
/**
* Gets metric
*
* @param string $metricAlias An alias
* @return Scalr_Scaling_Sensor
*/
public static function get($metricAlias)
{
if (!self::$sensors[$metricAlias]) {
switch ($metricAlias) {
case "la":
self::$sensors[$metricAlias] = new Scalr_Scaling_Sensors_LoadAverage();
break;
case "bw":
self::$sensors[$metricAlias] = new Scalr_Scaling_Sensors_BandWidth();
break;
case "custom":
self::$sensors[$metricAlias] = new Scalr_Scaling_Sensors_Custom();
break;
case "sqs":
self::$sensors[$metricAlias] = new Scalr_Scaling_Sensors_Sqs();
break;
case "http":
self::$sensors[$metricAlias] = new Scalr_Scaling_Sensors_Http();
break;
case "ram":
self::$sensors[$metricAlias] = new Scalr_Scaling_Sensors_FreeRam();
break;
}
}
return self::$sensors[$metricAlias];
}
/**
* Calculates metric value for specified metric and Farm role
*
* @param DBFarmRole $dbFarmRole Farm role for which metrics calculated
* @param Scalr_Scaling_FarmRoleMetric $farmRoleMetric Farm role metric
*
* @return mixed
*/
abstract public function getValue(DBFarmRole $dbFarmRole, Scalr_Scaling_FarmRoleMetric $farmRoleMetric);
}