/src/Reactive/EventStream/Combinators/Each.php

<?php

namespace Reactive\EventStream\Combinators;

use Reactive\Core\Reactor;
use Reactive\EventStream\EventStream;


class Each implements Reactor {
    /**
     * The callback function
     *
     * @var callable
     */
    protected $callback = null;
    
    /**
     * Creates a new Each object that reacts to events from $stream by calling $f
     * 
     * @param \Reactive\EventStream\EventStream $stream
     * @param callable $f
     */
    public function __construct(EventStream $stream, callable $f) {
        // Store the callback to use later
        $this->callback = $f;
        
        // Subscribe to events from the stream
        $stream->subscribe($this);
    }
    
    /**
     * {@inheritdoc}
     */
    public function react(\Reactive\Core\Emitter $source, $value) {
        // We react by simply calling our callback with the value
        call_user_func($this->callback, $value);
    }
}