<?php
/**
 *
 * Copyright (C) 2010, 2011, 2012  Robin Harvey (harvey.robin@gmail.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

namespace amqphp;

use amqphp\protocol;
use amqphp\wire;





class ConditionalExitStrategy implements ExitStrategy
{
    /** A copy of the Connection from the init callback */
    private $conn;

    function configure ($sMode) {}

    function init (Connection $conn) {
        $this->conn = $conn;
    }

    function preSelect ($prev=null) {
        if ($prev === false) {
            return false;
        }
        $hasConsumers = false;
        foreach ($this->conn->getChannels() as $chan) {
            if ($chan->canListen()) {
                $hasConsumers = true;
                break;
            }
        }

        if (! $hasConsumers) {
            return false;
        } else {
            return $prev;
        }
    }

    function complete () {
        $this->conn = null;
    }
}
