<?php
/**
 * SeekQuarry/Yioop --
 * Open Source Pure PHP Search Engine, Crawler, and Indexer
 *
 * Copyright (C) 2009 - 2026  Chris Pollett chris@pollett.org
 *
 * LICENSE:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * END LICENSE
 *
 * @author Chris Pollett chris@pollett.org
 * @license https://www.gnu.org/licenses/ GPL3
 * @link https://www.seekquarry.com/
 * @copyright 2009 - 2026
 * @filesource
 */
namespace seekquarry\yioop\library\mail;

/**
 * Exception type thrown by MailBackend implementations on
 * transport failure, missing resources, or invalid arguments.
 *
 * The message carried by this exception is intended to be
 * already localized via tl(); callers can put it directly into
 * $data['MAIL_ERROR'] and the view will render it as-is. The
 * underlying throwable from the IMAP client or other low-level
 * source, when available, is exposed via the standard
 * Exception::getPrevious() for log instrumentation.
 *
 * @author Chris Pollett
 */
class MailBackendException extends \Exception
{
    /**
     * Whether this failure looks like a transient connection-level
     * problem (socket dropped mid-response, connection refused or
     * timed out, server hung up) as opposed to a definitive error
     * (authentication rejected, certificate invalid, mailbox
     * missing). Transient failures are worth retrying on a later
     * run rather than abandoning the operation; the mail-clone job
     * uses this to end the current tick and resume the clone on the
     * next MediaUpdater pass instead of marking the whole job
     * failed. Defaults to false: only failures explicitly
     * classified as connection-level set it true.
     *
     * @var bool
     */
    protected $transient = false;
    /**
     * Records whether this failure is a transient connection-level
     * problem worth retrying later.
     *
     * @param bool $is_transient true to mark the failure transient
     * @return void
     */
    public function setTransient($is_transient)
    {
        $this->transient = (bool) $is_transient;
    }
    /**
     * Whether this failure is a transient connection-level problem
     * worth retrying later rather than a definitive error.
     *
     * @return bool true when the failure is transient
     */
    public function isTransient()
    {
        return $this->transient;
    }
}
