awsmug/alexa-sdk

<?php

namespace Alexa;

/**
 * Trait Alexa|Singleton
 *
 * Should be used on all Skip Objects which are singleton;
 */
trait Singleton {
    /**
     * @var $instance;
     */
    protected static $instance;

    /**
     * Singleton constructor
     */
    final private function __construct() {
        $this->init();
    }

    /**
     * Put all class starting stuff here
     */
    protected function init() {}

    /**
     * Getting instance
     *
     * @return $instance
     */
    final public static function get_instance() {
        if ( null === static::$instance ) {
            static::$instance = new static;
        }
        return static::$instance;
    }
}