EmptyBagOStuff.php

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<?php
class EmptyBagOStuff extends MediumSpecificBagOStuff {
    public function __construct( array $params = [] ) {
        parent::__construct( $params );
 
        $this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_NONE;
    }
 
    protected function doGet( $key, $flags = 0, &$casToken = null ) {
        $casToken = null;
 
        return false;
    }
 
    protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) {
        return true;
    }
 
    protected function doDelete( $key, $flags = 0 ) {
        return true;
    }
 
    protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) {
        return true;
    }
 
    protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) {
        // faster
        return $init;
    }
 
    public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
        // faster
        return true;
    }
}