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TwoDimensionsTunerStrategy.php
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TwoDimensionsTunerStrategy.php
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<?php
namespace ChrisHolland\HashTuner\Strategy;
use ChrisHolland\HashTuner\DTO\ExecutionBounds;
use ChrisHolland\HashTuner\DTO\ExecutionInfo;
use ChrisHolland\HashTuner\DTO\Settings;
use ChrisHolland\HashTuner\DTO\TuningResult;
use ChrisHolland\HashTuner\Exception\FirstDimensionLimitViolation;
use ChrisHolland\HashTuner\RunTime\HashRunTime;
class TwoDimensionsTunerStrategy implements TunerStrategy
{
public const FIRST_DIMENSION_BUMP_STOP_PERCENTAGE_OF_UPPER_LIMIT = 0.75;
/**
* @var float
*/
private $desiredExecutionTimeUpperLimit;
/**
* @var float
*/
private $desiredExecutionTimeLowerLimit;
/**
* @var float
*/
private $firstDimensionBumpStopThreshold;
/**
* @var HashRunTime
*/
private $runTime;
public function __construct(
ExecutionBounds $bounds,
HashRunTime $runTime
) {
$this->desiredExecutionTimeLowerLimit = $bounds->lower;
$this->desiredExecutionTimeUpperLimit = $bounds->upper;
$this->firstDimensionBumpStopThreshold =
self::FIRST_DIMENSION_BUMP_STOP_PERCENTAGE_OF_UPPER_LIMIT
*
$this->getUpper();
$this->runTime = $runTime;
}
public function isAcceptable() : bool
{
$answer = true;
if ($this->exceededUpperLimit()) {
$answer = false;
}
if ($this->hasNotPassedLowerThreshold()) {
$answer = false;
}
return $answer;
}
/**
* @return float
*/
public function getActualExecutionTime(): float
{
return $this->runTime->getExecutionTime();
}
private function exceededUpperLimit(): bool
{
return $this->getActualExecutionTime() > $this->getUpper();
}
private function hasNotPassedLowerThreshold(): bool
{
return $this->getActualExecutionTime() < $this->getLower();
}
public function hasReachedFirstDimensionBumpStopThreshold(): bool
{
return $this->getActualExecutionTime() >= $this->firstDimensionBumpStopThreshold;
}
/**
* @throws FirstDimensionLimitViolation
*/
private function bumpFirstDimension() : void
{
$this->runTime->bumpFirstDimension();
}
public function tuneFirstDimension() : void
{
while ($this->mustIncreaseFirstDimension()) {
try {
$this->bumpFirstDimension();
} catch (FirstDimensionLimitViolation $e) {
break;
}
}
}
private function bumpSecondDimension() : void
{
$this->runTime->bumpSecondDimension();
}
public function tuneSecondDimensionBeyondAcceptability() : void
{
while ($this->mustIncreaseSecondDimension()) {
$this->bumpSecondDimension();
}
}
public function tuneSecondDimensionBackWithinAcceptability() : void
{
$this->backTrackSecondDimensionByOne();
}
private function backTrackSecondDimensionByOne() : void
{
$this->runTime->lowerSecondDimensionOneStep();
}
public function tune() : void
{
$this->tuneFirstDimension();
$this->tuneSecondDimensionBeyondAcceptability();
$this->tuneSecondDimensionBackWithinAcceptability();
}
/**
* @return float
*/
private function getUpper(): float
{
return $this->desiredExecutionTimeUpperLimit;
}
/**
* @return float
*/
private function getLower(): float
{
return $this->desiredExecutionTimeLowerLimit;
}
public function getTuningResult() : TuningResult
{
$range = new ExecutionBounds(
$this->desiredExecutionTimeLowerLimit,
$this->desiredExecutionTimeUpperLimit
);
$settings = new Settings(
(int)$this->runTime->getFirstDimension(),
$this->runTime->getSecondDimension(),
$this->runTime->getThirdDimension()
);
$info = new ExecutionInfo(
$this->runTime->getInfo(),
$this->runTime->getExecutionTime()
);
return new TuningResult(
$this->runTime->getHardMemoryLimitInKilobytes(),
$range,
$settings,
$info
);
}
private function hasNotYetReachedFirstDimensionLimit(): bool
{
return $this->isAcceptable()
&&
!$this->hasReachedFirstDimensionBumpStopThreshold();
}
private function mustIncreaseFirstDimension(): bool
{
return $this->hasNotPassedLowerThreshold()
||
$this->hasNotYetReachedFirstDimensionLimit();
}
private function mustIncreaseSecondDimension(): bool
{
return $this->hasNotPassedLowerThreshold()
||
$this->isAcceptable();
}
}