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<?php |
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/** |
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* Copyright (c) 2016, HelloFresh GmbH. |
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* All rights reserved. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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*/ |
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namespace HelloFresh\FeatureToggle; |
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use Collections\VectorInterface; |
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/** |
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* Feature class. |
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*/ |
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class Feature implements FeatureInterface |
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{ |
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/** @var string */ |
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protected $name; |
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/** @var VectorInterface */ |
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protected $conditions; |
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/** @var int */ |
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protected $status = ToggleStatus::CONDITIONALLY_ACTIVE; |
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/** @var int */ |
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protected $strategy = ToggleStrategy::AFFIRMATIVE; |
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/** |
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* Feature constructor. |
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* @param $name - The name of the feature |
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* @param VectorInterface $conditions - The conditions to be fulfilled |
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* @param int $strategy The strategy to decide if the feature is enabled or not |
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*/ |
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public function __construct($name, VectorInterface $conditions, $strategy = ToggleStrategy::AFFIRMATIVE) |
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{ |
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$this->name = $name; |
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$this->conditions = $conditions; |
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$this->strategy = $strategy; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getName() |
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{ |
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return $this->name; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getStrategy() |
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{ |
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return $this->strategy; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getStatus() |
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{ |
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return $this->status; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getConditions() |
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{ |
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return $this->conditions; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function activate($status = ToggleStatus::CONDITIONALLY_ACTIVE) |
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{ |
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$this->status = $status; |
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return $this; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function deactivate() |
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{ |
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$this->status = ToggleStatus::INACTIVE; |
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return $this; |
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} |
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/** |
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* Checks whether the toggle is active for the given context. |
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* |
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* @param Context $context |
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* |
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* @return boolean True, if one of conditions hold for the context. |
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*/ |
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public function activeFor(Context $context) |
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{ |
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switch ($this->status) { |
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case ToggleStatus::ALWAYS_ACTIVE: |
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return true; |
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case ToggleStatus::INACTIVE: |
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return false; |
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case ToggleStatus::CONDITIONALLY_ACTIVE: |
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switch ($this->strategy) { |
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case ToggleStrategy::AFFIRMATIVE: |
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return $this->atLeastOneConditionHolds($context); |
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case ToggleStrategy::MAJORITY: |
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return $this->moreThanHalfConditionsHold($context); |
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case ToggleStrategy::UNANIMOUS: |
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return $this->allConditionsHold($context); |
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} |
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} |
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} |
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/** |
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* @param Context $context |
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* |
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* @return bool |
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*/ |
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private function atLeastOneConditionHolds(Context $context) |
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{ |
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/** @var ConditionInterface $condition */ |
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foreach ($this->conditions as $condition) { |
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if ($condition->holdsFor($context)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param Context $context |
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* |
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* @return bool |
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*/ |
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private function moreThanHalfConditionsHold(Context $context) |
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{ |
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$nbPositive = 0; |
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$nbNegative = 0; |
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/** @var ConditionInterface $condition */ |
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foreach ($this->conditions as $condition) { |
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$condition->holdsFor($context) ? $nbPositive++ : $nbNegative++; |
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} |
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return $nbPositive > $nbNegative; |
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} |
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/** |
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* @param Context $context |
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* |
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* @return bool |
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*/ |
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private function allConditionsHold(Context $context) |
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{ |
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/** @var ConditionInterface $condition */ |
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foreach ($this->conditions as $condition) { |
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if (!$condition->holdsFor($context)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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hellofresh /
feature-toggle
