PoolCounterWorkViaCallback.php

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<?php
class PoolCounterWorkViaCallback extends PoolCounterWork {
    protected $doWork;
    protected $doCachedWork;
    protected $fallback;
    protected $error;

    public function __construct( $type, $key, array $callbacks ) {
        parent::__construct( $type, $key );
        foreach ( [ 'doWork', 'doCachedWork', 'fallback', 'error' ] as $name ) {
            if ( isset( $callbacks[$name] ) ) {
                if ( !is_callable( $callbacks[$name] ) ) {
                    throw new MWException( "Invalid callback provided for '$name' function." );
                }
                $this->$name = $callbacks[$name];
            }
        }
        if ( !isset( $this->doWork ) ) {
            throw new MWException( "No callback provided for 'doWork' function." );
        }
        $this->cacheable = isset( $this->doCachedWork );
    }

    public function doWork() {
        return ( $this->doWork )();
    }

    public function getCachedWork() {
        if ( $this->doCachedWork ) {
            return ( $this->doCachedWork )();
        }
        return false;
    }

    public function fallback() {
        if ( $this->fallback ) {
            return ( $this->fallback )();
        }
        return false;
    }

    public function error( $status ) {
        if ( $this->error ) {
            return ( $this->error )( $status );
        }
        return false;
    }
}